wp-admin/js/customize-nav-menus.js

   1 /* global _wpCustomizeNavMenusSettings, wpNavMenu, console */
   2 ( function( api, wp, $ ) {
   3         'use strict';
   4
   5         /**
   6          * Set up wpNavMenu for drag and drop.
   7          */
   8         wpNavMenu.originalInit = wpNavMenu.init;
   9         wpNavMenu.options.menuItemDepthPerLevel = 20;
  10         wpNavMenu.options.sortableItems         = '> .customize-control-nav_menu_item';
  11         wpNavMenu.options.targetTolerance       = 10;
  12         wpNavMenu.init = function() {
  13                 this.jQueryExtensions();
  14         };
  15
  16         api.Menus = api.Menus || {};
  17
  18         // Link settings.
  19         api.Menus.data = {
  20                 itemTypes: [],
  21                 l10n: {},
  22                 settingTransport: 'refresh',
  23                 phpIntMax: 0,
  24                 defaultSettingValues: {
  25                         nav_menu: {},
  26                         nav_menu_item: {}
  27                 },
  28                 locationSlugMappedToName: {}
  29         };
  30         if ( 'undefined' !== typeof _wpCustomizeNavMenusSettings ) {
  31                 $.extend( api.Menus.data, _wpCustomizeNavMenusSettings );
  32         }
  33
  34         /**
  35          * Newly-created Nav Menus and Nav Menu Items have negative integer IDs which
  36          * serve as placeholders until Save & Publish happens.
  37          *
  38          * @return {number}
  39          */
  40         api.Menus.generatePlaceholderAutoIncrementId = function() {
  41                 return -Math.ceil( api.Menus.data.phpIntMax * Math.random() );
  42         };
  43
  44         /**
  45          * wp.customize.Menus.AvailableItemModel
  46          *
  47          * A single available menu item model. See PHP's WP_Customize_Nav_Menu_Item_Setting class.
  48          *
  49          * @constructor
  50          * @augments Backbone.Model
  51          */
  52         api.Menus.AvailableItemModel = Backbone.Model.extend( $.extend(
  53                 {
  54                         id: null // This is only used by Backbone.
  55                 },
  56                 api.Menus.data.defaultSettingValues.nav_menu_item
  57         ) );
  58
  59         /**
  60          * wp.customize.Menus.AvailableItemCollection
  61          *
  62          * Collection for available menu item models.
  63          *
  64          * @constructor
  65          * @augments Backbone.Model
  66          */
  67         api.Menus.AvailableItemCollection = Backbone.Collection.extend({
  68                 model: api.Menus.AvailableItemModel,
  69
  70                 sort_key: 'order',
  71
  72                 comparator: function( item ) {
  73                         return -item.get( this.sort_key );
  74                 },
  75
  76                 sortByField: function( fieldName ) {
  77                         this.sort_key = fieldName;
  78                         this.sort();
  79                 }
  80         });
  81         api.Menus.availableMenuItems = new api.Menus.AvailableItemCollection( api.Menus.data.availableMenuItems );
  82
  83         /**
  84          * Insert a new `auto-draft` post.
  85          *
  86          * @since 4.7.0
  87          * @access public
  88          *
  89          * @param {object} params - Parameters for the draft post to create.
  90          * @param {string} params.post_type - Post type to add.
  91          * @param {string} params.post_title - Post title to use.
  92          * @return {jQuery.promise} Promise resolved with the added post.
  93          */
  94         api.Menus.insertAutoDraftPost = function insertAutoDraftPost( params ) {
  95                 var request, deferred = $.Deferred();
  96
  97                 request = wp.ajax.post( 'customize-nav-menus-insert-auto-draft', {
  98                         'customize-menus-nonce': api.settings.nonce['customize-menus'],
  99                         'wp_customize': 'on',
 100                         'params': params
 101                 } );
 102
 103                 request.done( function( response ) {
 104                         if ( response.post_id ) {
 105                                 api( 'nav_menus_created_posts' ).set(
 106                                         api( 'nav_menus_created_posts' ).get().concat( [ response.post_id ] )
 107                                 );
 108
 109                                 if ( 'page' === params.post_type ) {
 110
 111                                         // Activate static front page controls as this could be the first page created.
 112                                         if ( api.section.has( 'static_front_page' ) ) {
 113                                                 api.section( 'static_front_page' ).activate();
 114                                         }
 115
 116                                         // Add new page to dropdown-pages controls.
 117                                         api.control.each( function( control ) {
 118                                                 var select;
 119                                                 if ( 'dropdown-pages' === control.params.type ) {
 120                                                         select = control.container.find( 'select[name^="_customize-dropdown-pages-"]' );
 121                                                         select.append( new Option( params.post_title, response.post_id ) );
 122                                                 }
 123                                         } );
 124                                 }
 125                                 deferred.resolve( response );
 126                         }
 127                 } );
 128
 129                 request.fail( function( response ) {
 130                         var error = response || '';
 131
 132                         if ( 'undefined' !== typeof response.message ) {
 133                                 error = response.message;
 134                         }
 135
 136                         console.error( error );
 137                         deferred.rejectWith( error );
 138                 } );
 139
 140                 return deferred.promise();
 141         };
 142
 143         /**
 144          * wp.customize.Menus.AvailableMenuItemsPanelView
 145          *
 146          * View class for the available menu items panel.
 147          *
 148          * @constructor
 149          * @augments wp.Backbone.View
 150          * @augments Backbone.View
 151          */
 152         api.Menus.AvailableMenuItemsPanelView = wp.Backbone.View.extend({
 153
 154                 el: '#available-menu-items',
 155
 156                 events: {
 157                         'input #menu-items-search': 'debounceSearch',
 158                         'keyup #menu-items-search': 'debounceSearch',
 159                         'focus .menu-item-tpl': 'focus',
 160                         'click .menu-item-tpl': '_submit',
 161                         'click #custom-menu-item-submit': '_submitLink',
 162                         'keypress #custom-menu-item-name': '_submitLink',
 163                         'click .new-content-item .add-content': '_submitNew',
 164                         'keypress .create-item-input': '_submitNew',
 165                         'keydown': 'keyboardAccessible'
 166                 },
 167
 168                 // Cache current selected menu item.
 169                 selected: null,
 170
 171                 // Cache menu control that opened the panel.
 172                 currentMenuControl: null,
 173                 debounceSearch: null,
 174                 $search: null,
 175                 $clearResults: null,
 176                 searchTerm: '',
 177                 rendered: false,
 178                 pages: {},
 179                 sectionContent: '',
 180                 loading: false,
 181                 addingNew: false,
 182
 183                 initialize: function() {
 184                         var self = this;
 185
 186                         if ( ! api.panel.has( 'nav_menus' ) ) {
 187                                 return;
 188                         }
 189
 190                         this.$search = $( '#menu-items-search' );
 191                         this.$clearResults = this.$el.find( '.clear-results' );
 192                         this.sectionContent = this.$el.find( '.available-menu-items-list' );
 193
 194                         this.debounceSearch = _.debounce( self.search, 500 );
 195
 196                         _.bindAll( this, 'close' );
 197
 198                         // If the available menu items panel is open and the customize controls are
 199                         // interacted with (other than an item being deleted), then close the
 200                         // available menu items panel. Also close on back button click.
 201                         $( '#customize-controls, .customize-section-back' ).on( 'click keydown', function( e ) {
 202                                 var isDeleteBtn = $( e.target ).is( '.item-delete, .item-delete *' ),
 203                                         isAddNewBtn = $( e.target ).is( '.add-new-menu-item, .add-new-menu-item *' );
 204                                 if ( $( 'body' ).hasClass( 'adding-menu-items' ) && ! isDeleteBtn && ! isAddNewBtn ) {
 205                                         self.close();
 206                                 }
 207                         } );
 208
 209                         // Clear the search results and trigger a `keyup` event to fire a new search.
 210                         this.$clearResults.on( 'click', function() {
 211                                 self.$search.val( '' ).focus().trigger( 'keyup' );
 212                         } );
 213
 214                         this.$el.on( 'input', '#custom-menu-item-name.invalid, #custom-menu-item-url.invalid', function() {
 215                                 $( this ).removeClass( 'invalid' );
 216                         });
 217
 218                         // Load available items if it looks like we'll need them.
 219                         api.panel( 'nav_menus' ).container.bind( 'expanded', function() {
 220                                 if ( ! self.rendered ) {
 221                                         self.initList();
 222                                         self.rendered = true;
 223                                 }
 224                         });
 225
 226                         // Load more items.
 227                         this.sectionContent.scroll( function() {
 228                                 var totalHeight = self.$el.find( '.accordion-section.open .available-menu-items-list' ).prop( 'scrollHeight' ),
 229                                         visibleHeight = self.$el.find( '.accordion-section.open' ).height();
 230
 231                                 if ( ! self.loading && $( this ).scrollTop() > 3 / 4 * totalHeight - visibleHeight ) {
 232                                         var type = $( this ).data( 'type' ),
 233                                                 object = $( this ).data( 'object' );
 234
 235                                         if ( 'search' === type ) {
 236                                                 if ( self.searchTerm ) {
 237                                                         self.doSearch( self.pages.search );
 238                                                 }
 239                                         } else {
 240                                                 self.loadItems( [
 241                                                         { type: type, object: object }
 242                                                 ] );
 243                                         }
 244                                 }
 245                         });
 246
 247                         // Close the panel if the URL in the preview changes
 248                         api.previewer.bind( 'url', this.close );
 249
 250                         self.delegateEvents();
 251                 },
 252
 253                 // Search input change handler.
 254                 search: function( event ) {
 255                         var $searchSection = $( '#available-menu-items-search' ),
 256                                 $otherSections = $( '#available-menu-items .accordion-section' ).not( $searchSection );
 257
 258                         if ( ! event ) {
 259                                 return;
 260                         }
 261
 262                         if ( this.searchTerm === event.target.value ) {
 263                                 return;
 264                         }
 265
 266                         if ( '' !== event.target.value && ! $searchSection.hasClass( 'open' ) ) {
 267                                 $otherSections.fadeOut( 100 );
 268                                 $searchSection.find( '.accordion-section-content' ).slideDown( 'fast' );
 269                                 $searchSection.addClass( 'open' );
 270                                 this.$clearResults.addClass( 'is-visible' );
 271                         } else if ( '' === event.target.value ) {
 272                                 $searchSection.removeClass( 'open' );
 273                                 $otherSections.show();
 274                                 this.$clearResults.removeClass( 'is-visible' );
 275                         }
 276
 277                         this.searchTerm = event.target.value;
 278                         this.pages.search = 1;
 279                         this.doSearch( 1 );
 280                 },
 281
 282                 // Get search results.
 283                 doSearch: function( page ) {
 284                         var self = this, params,
 285                                 $section = $( '#available-menu-items-search' ),
 286                                 $content = $section.find( '.accordion-section-content' ),
 287                                 itemTemplate = wp.template( 'available-menu-item' );
 288
 289                         if ( self.currentRequest ) {
 290                                 self.currentRequest.abort();
 291                         }
 292
 293                         if ( page < 0 ) {
 294                                 return;
 295                         } else if ( page > 1 ) {
 296                                 $section.addClass( 'loading-more' );
 297                                 $content.attr( 'aria-busy', 'true' );
 298                                 wp.a11y.speak( api.Menus.data.l10n.itemsLoadingMore );
 299                         } else if ( '' === self.searchTerm ) {
 300                                 $content.html( '' );
 301                                 wp.a11y.speak( '' );
 302                                 return;
 303                         }
 304
 305                         $section.addClass( 'loading' );
 306                         self.loading = true;
 307
 308                         params = api.previewer.query( { excludeCustomizedSaved: true } );
 309                         _.extend( params, {
 310                                 'customize-menus-nonce': api.settings.nonce['customize-menus'],
 311                                 'wp_customize': 'on',
 312                                 'search': self.searchTerm,
 313                                 'page': page
 314                         } );
 315
 316                         self.currentRequest = wp.ajax.post( 'search-available-menu-items-customizer', params );
 317
 318                         self.currentRequest.done(function( data ) {
 319                                 var items;
 320                                 if ( 1 === page ) {
 321                                         // Clear previous results as it's a new search.
 322                                         $content.empty();
 323                                 }
 324                                 $section.removeClass( 'loading loading-more' );
 325                                 $content.attr( 'aria-busy', 'false' );
 326                                 $section.addClass( 'open' );
 327                                 self.loading = false;
 328                                 items = new api.Menus.AvailableItemCollection( data.items );
 329                                 self.collection.add( items.models );
 330                                 items.each( function( menuItem ) {
 331                                         $content.append( itemTemplate( menuItem.attributes ) );
 332                                 } );
 333                                 if ( 20 > items.length ) {
 334                                         self.pages.search = -1; // Up to 20 posts and 20 terms in results, if <20, no more results for either.
 335                                 } else {
 336                                         self.pages.search = self.pages.search + 1;
 337                                 }
 338                                 if ( items && page > 1 ) {
 339                                         wp.a11y.speak( api.Menus.data.l10n.itemsFoundMore.replace( '%d', items.length ) );
 340                                 } else if ( items && page === 1 ) {
 341                                         wp.a11y.speak( api.Menus.data.l10n.itemsFound.replace( '%d', items.length ) );
 342                                 }
 343                         });
 344
 345                         self.currentRequest.fail(function( data ) {
 346                                 // data.message may be undefined, for example when typing slow and the request is aborted.
 347                                 if ( data.message ) {
 348                                         $content.empty().append( $( '<li class="nothing-found"></li>' ).text( data.message ) );
 349                                         wp.a11y.speak( data.message );
 350                                 }
 351                                 self.pages.search = -1;
 352                         });
 353
 354                         self.currentRequest.always(function() {
 355                                 $section.removeClass( 'loading loading-more' );
 356                                 $content.attr( 'aria-busy', 'false' );
 357                                 self.loading = false;
 358                                 self.currentRequest = null;
 359                         });
 360                 },
 361
 362                 // Render the individual items.
 363                 initList: function() {
 364                         var self = this;
 365
 366                         // Render the template for each item by type.
 367                         _.each( api.Menus.data.itemTypes, function( itemType ) {
 368                                 self.pages[ itemType.type + ':' + itemType.object ] = 0;
 369                         } );
 370                         self.loadItems( api.Menus.data.itemTypes );
 371                 },
 372
 373                 /**
 374                  * Load available nav menu items.
 375                  *
 376                  * @since 4.3.0
 377                  * @since 4.7.0 Changed function signature to take list of item types instead of single type/object.
 378                  * @access private
 379                  *
 380                  * @param {Array.<object>} itemTypes List of objects containing type and key.
 381                  * @param {string} deprecated Formerly the object parameter.
 382                  * @returns {void}
 383                  */
 384                 loadItems: function( itemTypes, deprecated ) {
 385                         var self = this, _itemTypes, requestItemTypes = [], params, request, itemTemplate, availableMenuItemContainers = {};
 386                         itemTemplate = wp.template( 'available-menu-item' );
 387
 388                         if ( _.isString( itemTypes ) && _.isString( deprecated ) ) {
 389                                 _itemTypes = [ { type: itemTypes, object: deprecated } ];
 390                         } else {
 391                                 _itemTypes = itemTypes;
 392                         }
 393
 394                         _.each( _itemTypes, function( itemType ) {
 395                                 var container, name = itemType.type + ':' + itemType.object;
 396                                 if ( -1 === self.pages[ name ] ) {
 397                                         return; // Skip types for which there are no more results.
 398                                 }
 399                                 container = $( '#available-menu-items-' + itemType.type + '-' + itemType.object );
 400                                 container.find( '.accordion-section-title' ).addClass( 'loading' );
 401                                 availableMenuItemContainers[ name ] = container;
 402
 403                                 requestItemTypes.push( {
 404                                         object: itemType.object,
 405                                         type: itemType.type,
 406                                         page: self.pages[ name ]
 407                                 } );
 408                         } );
 409
 410                         if ( 0 === requestItemTypes.length ) {
 411                                 return;
 412                         }
 413
 414                         self.loading = true;
 415
 416                         params = api.previewer.query( { excludeCustomizedSaved: true } );
 417                         _.extend( params, {
 418                                 'customize-menus-nonce': api.settings.nonce['customize-menus'],
 419                                 'wp_customize': 'on',
 420                                 'item_types': requestItemTypes
 421                         } );
 422
 423                         request = wp.ajax.post( 'load-available-menu-items-customizer', params );
 424
 425                         request.done(function( data ) {
 426                                 var typeInner;
 427                                 _.each( data.items, function( typeItems, name ) {
 428                                         if ( 0 === typeItems.length ) {
 429                                                 if ( 0 === self.pages[ name ] ) {
 430                                                         availableMenuItemContainers[ name ].find( '.accordion-section-title' )
 431                                                                 .addClass( 'cannot-expand' )
 432                                                                 .removeClass( 'loading' )
 433                                                                 .find( '.accordion-section-title > button' )
 434                                                                 .prop( 'tabIndex', -1 );
 435                                                 }
 436                                                 self.pages[ name ] = -1;
 437                                                 return;
 438                                         } else if ( ( 'post_type:page' === name ) && ( ! availableMenuItemContainers[ name ].hasClass( 'open' ) ) ) {
 439                                                 availableMenuItemContainers[ name ].find( '.accordion-section-title > button' ).click();
 440                                         }
 441                                         typeItems = new api.Menus.AvailableItemCollection( typeItems ); // @todo Why is this collection created and then thrown away?
 442                                         self.collection.add( typeItems.models );
 443                                         typeInner = availableMenuItemContainers[ name ].find( '.available-menu-items-list' );
 444                                         typeItems.each( function( menuItem ) {
 445                                                 typeInner.append( itemTemplate( menuItem.attributes ) );
 446                                         } );
 447                                         self.pages[ name ] += 1;
 448                                 });
 449                         });
 450                         request.fail(function( data ) {
 451                                 if ( typeof console !== 'undefined' && console.error ) {
 452                                         console.error( data );
 453                                 }
 454                         });
 455                         request.always(function() {
 456                                 _.each( availableMenuItemContainers, function( container ) {
 457                                         container.find( '.accordion-section-title' ).removeClass( 'loading' );
 458                                 } );
 459                                 self.loading = false;
 460                         });
 461                 },
 462
 463                 // Adjust the height of each section of items to fit the screen.
 464                 itemSectionHeight: function() {
 465                         var sections, lists, totalHeight, accordionHeight, diff;
 466                         totalHeight = window.innerHeight;
 467                         sections = this.$el.find( '.accordion-section:not( #available-menu-items-search ) .accordion-section-content' );
 468                         lists = this.$el.find( '.accordion-section:not( #available-menu-items-search ) .available-menu-items-list:not(":only-child")' );
 469                         accordionHeight =  46 * ( 1 + sections.length ) + 14; // Magic numbers.
 470                         diff = totalHeight - accordionHeight;
 471                         if ( 120 < diff && 290 > diff ) {
 472                                 sections.css( 'max-height', diff );
 473                                 lists.css( 'max-height', ( diff - 60 ) );
 474                         }
 475                 },
 476
 477                 // Highlights a menu item.
 478                 select: function( menuitemTpl ) {
 479                         this.selected = $( menuitemTpl );
 480                         this.selected.siblings( '.menu-item-tpl' ).removeClass( 'selected' );
 481                         this.selected.addClass( 'selected' );
 482                 },
 483
 484                 // Highlights a menu item on focus.
 485                 focus: function( event ) {
 486                         this.select( $( event.currentTarget ) );
 487                 },
 488
 489                 // Submit handler for keypress and click on menu item.
 490                 _submit: function( event ) {
 491                         // Only proceed with keypress if it is Enter or Spacebar
 492                         if ( 'keypress' === event.type && ( 13 !== event.which && 32 !== event.which ) ) {
 493                                 return;
 494                         }
 495
 496                         this.submit( $( event.currentTarget ) );
 497                 },
 498
 499                 // Adds a selected menu item to the menu.
 500                 submit: function( menuitemTpl ) {
 501                         var menuitemId, menu_item;
 502
 503                         if ( ! menuitemTpl ) {
 504                                 menuitemTpl = this.selected;
 505                         }
 506
 507                         if ( ! menuitemTpl || ! this.currentMenuControl ) {
 508                                 return;
 509                         }
 510
 511                         this.select( menuitemTpl );
 512
 513                         menuitemId = $( this.selected ).data( 'menu-item-id' );
 514                         menu_item = this.collection.findWhere( { id: menuitemId } );
 515                         if ( ! menu_item ) {
 516                                 return;
 517                         }
 518
 519                         this.currentMenuControl.addItemToMenu( menu_item.attributes );
 520
 521                         $( menuitemTpl ).find( '.menu-item-handle' ).addClass( 'item-added' );
 522                 },
 523
 524                 // Submit handler for keypress and click on custom menu item.
 525                 _submitLink: function( event ) {
 526                         // Only proceed with keypress if it is Enter.
 527                         if ( 'keypress' === event.type && 13 !== event.which ) {
 528                                 return;
 529                         }
 530
 531                         this.submitLink();
 532                 },
 533
 534                 // Adds the custom menu item to the menu.
 535                 submitLink: function() {
 536                         var menuItem,
 537                                 itemName = $( '#custom-menu-item-name' ),
 538                                 itemUrl = $( '#custom-menu-item-url' );
 539
 540                         if ( ! this.currentMenuControl ) {
 541                                 return;
 542                         }
 543
 544                         if ( '' === itemName.val() ) {
 545                                 itemName.addClass( 'invalid' );
 546                                 return;
 547                         } else if ( '' === itemUrl.val() || 'http://' === itemUrl.val() ) {
 548                                 itemUrl.addClass( 'invalid' );
 549                                 return;
 550                         }
 551
 552                         menuItem = {
 553                                 'title': itemName.val(),
 554                                 'url': itemUrl.val(),
 555                                 'type': 'custom',
 556                                 'type_label': api.Menus.data.l10n.custom_label,
 557                                 'object': 'custom'
 558                         };
 559
 560                         this.currentMenuControl.addItemToMenu( menuItem );
 561
 562                         // Reset the custom link form.
 563                         itemUrl.val( 'http://' );
 564                         itemName.val( '' );
 565                 },
 566
 567                 /**
 568                  * Submit handler for keypress (enter) on field and click on button.
 569                  *
 570                  * @since 4.7.0
 571                  * @private
 572                  *
 573                  * @param {jQuery.Event} event Event.
 574                  * @returns {void}
 575                  */
 576                 _submitNew: function( event ) {
 577                         var container;
 578
 579                         // Only proceed with keypress if it is Enter.
 580                         if ( 'keypress' === event.type && 13 !== event.which ) {
 581                                 return;
 582                         }
 583
 584                         if ( this.addingNew ) {
 585                                 return;
 586                         }
 587
 588                         container = $( event.target ).closest( '.accordion-section' );
 589
 590                         this.submitNew( container );
 591                 },
 592
 593                 /**
 594                  * Creates a new object and adds an associated menu item to the menu.
 595                  *
 596                  * @since 4.7.0
 597                  * @private
 598                  *
 599                  * @param {jQuery} container
 600                  * @returns {void}
 601                  */
 602                 submitNew: function( container ) {
 603                         var panel = this,
 604                                 itemName = container.find( '.create-item-input' ),
 605                                 title = itemName.val(),
 606                                 dataContainer = container.find( '.available-menu-items-list' ),
 607                                 itemType = dataContainer.data( 'type' ),
 608                                 itemObject = dataContainer.data( 'object' ),
 609                                 itemTypeLabel = dataContainer.data( 'type_label' ),
 610                                 promise;
 611
 612                         if ( ! this.currentMenuControl ) {
 613                                 return;
 614                         }
 615
 616                         // Only posts are supported currently.
 617                         if ( 'post_type' !== itemType ) {
 618                                 return;
 619                         }
 620
 621                         if ( '' === $.trim( itemName.val() ) ) {
 622                                 itemName.addClass( 'invalid' );
 623                                 itemName.focus();
 624                                 return;
 625                         } else {
 626                                 itemName.removeClass( 'invalid' );
 627                                 container.find( '.accordion-section-title' ).addClass( 'loading' );
 628                         }
 629
 630                         panel.addingNew = true;
 631                         itemName.attr( 'disabled', 'disabled' );
 632                         promise = api.Menus.insertAutoDraftPost( {
 633                                 post_title: title,
 634                                 post_type: itemObject
 635                         } );
 636                         promise.done( function( data ) {
 637                                 var availableItem, $content, itemElement;
 638                                 availableItem = new api.Menus.AvailableItemModel( {
 639                                         'id': 'post-' + data.post_id, // Used for available menu item Backbone models.
 640                                         'title': itemName.val(),
 641                                         'type': itemType,
 642                                         'type_label': itemTypeLabel,
 643                                         'object': itemObject,
 644                                         'object_id': data.post_id,
 645                                         'url': data.url
 646                                 } );
 647
 648                                 // Add new item to menu.
 649                                 panel.currentMenuControl.addItemToMenu( availableItem.attributes );
 650
 651                                 // Add the new item to the list of available items.
 652                                 api.Menus.availableMenuItemsPanel.collection.add( availableItem );
 653                                 $content = container.find( '.available-menu-items-list' );
 654                                 itemElement = $( wp.template( 'available-menu-item' )( availableItem.attributes ) );
 655                                 itemElement.find( '.menu-item-handle:first' ).addClass( 'item-added' );
 656                                 $content.prepend( itemElement );
 657                                 $content.scrollTop();
 658
 659                                 // Reset the create content form.
 660                                 itemName.val( '' ).removeAttr( 'disabled' );
 661                                 panel.addingNew = false;
 662                                 container.find( '.accordion-section-title' ).removeClass( 'loading' );
 663                         } );
 664                 },
 665
 666                 // Opens the panel.
 667                 open: function( menuControl ) {
 668                         this.currentMenuControl = menuControl;
 669
 670                         this.itemSectionHeight();
 671
 672                         $( 'body' ).addClass( 'adding-menu-items' );
 673
 674                         // Collapse all controls.
 675                         _( this.currentMenuControl.getMenuItemControls() ).each( function( control ) {
 676                                 control.collapseForm();
 677                         } );
 678
 679                         this.$el.find( '.selected' ).removeClass( 'selected' );
 680
 681                         this.$search.focus();
 682                 },
 683
 684                 // Closes the panel
 685                 close: function( options ) {
 686                         options = options || {};
 687
 688                         if ( options.returnFocus && this.currentMenuControl ) {
 689                                 this.currentMenuControl.container.find( '.add-new-menu-item' ).focus();
 690                         }
 691
 692                         this.currentMenuControl = null;
 693                         this.selected = null;
 694
 695                         $( 'body' ).removeClass( 'adding-menu-items' );
 696                         $( '#available-menu-items .menu-item-handle.item-added' ).removeClass( 'item-added' );
 697
 698                         this.$search.val( '' );
 699                 },
 700
 701                 // Add a few keyboard enhancements to the panel.
 702                 keyboardAccessible: function( event ) {
 703                         var isEnter = ( 13 === event.which ),
 704                                 isEsc = ( 27 === event.which ),
 705                                 isBackTab = ( 9 === event.which && event.shiftKey ),
 706                                 isSearchFocused = $( event.target ).is( this.$search );
 707
 708                         // If enter pressed but nothing entered, don't do anything
 709                         if ( isEnter && ! this.$search.val() ) {
 710                                 return;
 711                         }
 712
 713                         if ( isSearchFocused && isBackTab ) {
 714                                 this.currentMenuControl.container.find( '.add-new-menu-item' ).focus();
 715                                 event.preventDefault(); // Avoid additional back-tab.
 716                         } else if ( isEsc ) {
 717                                 this.close( { returnFocus: true } );
 718                         }
 719                 }
 720         });
 721
 722         /**
 723          * wp.customize.Menus.MenusPanel
 724          *
 725          * Customizer panel for menus. This is used only for screen options management.
 726          * Note that 'menus' must match the WP_Customize_Menu_Panel::$type.
 727          *
 728          * @constructor
 729          * @augments wp.customize.Panel
 730          */
 731         api.Menus.MenusPanel = api.Panel.extend({
 732
 733                 attachEvents: function() {
 734                         api.Panel.prototype.attachEvents.call( this );
 735
 736                         var panel = this,
 737                                 panelMeta = panel.container.find( '.panel-meta' ),
 738                                 help = panelMeta.find( '.customize-help-toggle' ),
 739                                 content = panelMeta.find( '.customize-panel-description' ),
 740                                 options = $( '#screen-options-wrap' ),
 741                                 button = panelMeta.find( '.customize-screen-options-toggle' );
 742                         button.on( 'click keydown', function( event ) {
 743                                 if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
 744                                         return;
 745                                 }
 746                                 event.preventDefault();
 747
 748                                 // Hide description
 749                                 if ( content.not( ':hidden' ) ) {
 750                                         content.slideUp( 'fast' );
 751                                         help.attr( 'aria-expanded', 'false' );
 752                                 }
 753
 754                                 if ( 'true' === button.attr( 'aria-expanded' ) ) {
 755                                         button.attr( 'aria-expanded', 'false' );
 756                                         panelMeta.removeClass( 'open' );
 757                                         panelMeta.removeClass( 'active-menu-screen-options' );
 758                                         options.slideUp( 'fast' );
 759                                 } else {
 760                                         button.attr( 'aria-expanded', 'true' );
 761                                         panelMeta.addClass( 'open' );
 762                                         panelMeta.addClass( 'active-menu-screen-options' );
 763                                         options.slideDown( 'fast' );
 764                                 }
 765
 766                                 return false;
 767                         } );
 768
 769                         // Help toggle
 770                         help.on( 'click keydown', function( event ) {
 771                                 if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
 772                                         return;
 773                                 }
 774                                 event.preventDefault();
 775
 776                                 if ( 'true' === button.attr( 'aria-expanded' ) ) {
 777                                         button.attr( 'aria-expanded', 'false' );
 778                                         help.attr( 'aria-expanded', 'true' );
 779                                         panelMeta.addClass( 'open' );
 780                                         panelMeta.removeClass( 'active-menu-screen-options' );
 781                                         options.slideUp( 'fast' );
 782                                         content.slideDown( 'fast' );
 783                                 }
 784                         } );
 785                 },
 786
 787                 /**
 788                  * Update field visibility when clicking on the field toggles.
 789                  */
 790                 ready: function() {
 791                         var panel = this;
 792                         panel.container.find( '.hide-column-tog' ).click( function() {
 793                                 panel.saveManageColumnsState();
 794                         });
 795                 },
 796
 797                 /**
 798                  * Save hidden column states.
 799                  *
 800                  * @since 4.3.0
 801                  * @private
 802                  *
 803                  * @returns {void}
 804                  */
 805                 saveManageColumnsState: _.debounce( function() {
 806                         var panel = this;
 807                         if ( panel._updateHiddenColumnsRequest ) {
 808                                 panel._updateHiddenColumnsRequest.abort();
 809                         }
 810
 811                         panel._updateHiddenColumnsRequest = wp.ajax.post( 'hidden-columns', {
 812                                 hidden: panel.hidden(),
 813                                 screenoptionnonce: $( '#screenoptionnonce' ).val(),
 814                                 page: 'nav-menus'
 815                         } );
 816                         panel._updateHiddenColumnsRequest.always( function() {
 817                                 panel._updateHiddenColumnsRequest = null;
 818                         } );
 819                 }, 2000 ),
 820
 821                 /**
 822                  * @deprecated Since 4.7.0 now that the nav_menu sections are responsible for toggling the classes on their own containers.
 823                  */
 824                 checked: function() {},
 825
 826                 /**
 827                  * @deprecated Since 4.7.0 now that the nav_menu sections are responsible for toggling the classes on their own containers.
 828                  */
 829                 unchecked: function() {},
 830
 831                 /**
 832                  * Get hidden fields.
 833                  *
 834                  * @since 4.3.0
 835                  * @private
 836                  *
 837                  * @returns {Array} Fields (columns) that are hidden.
 838                  */
 839                 hidden: function() {
 840                         return $( '.hide-column-tog' ).not( ':checked' ).map( function() {
 841                                 var id = this.id;
 842                                 return id.substring( 0, id.length - 5 );
 843                         }).get().join( ',' );
 844                 }
 845         } );
 846
 847         /**
 848          * wp.customize.Menus.MenuSection
 849          *
 850          * Customizer section for menus. This is used only for lazy-loading child controls.
 851          * Note that 'nav_menu' must match the WP_Customize_Menu_Section::$type.
 852          *
 853          * @constructor
 854          * @augments wp.customize.Section
 855          */
 856         api.Menus.MenuSection = api.Section.extend({
 857
 858                 /**
 859                  * Initialize.
 860                  *
 861                  * @since 4.3.0
 862                  *
 863                  * @param {String} id
 864                  * @param {Object} options
 865                  */
 866                 initialize: function( id, options ) {
 867                         var section = this;
 868                         api.Section.prototype.initialize.call( section, id, options );
 869                         section.deferred.initSortables = $.Deferred();
 870                 },
 871
 872                 /**
 873                  * Ready.
 874                  */
 875                 ready: function() {
 876                         var section = this, fieldActiveToggles, handleFieldActiveToggle;
 877
 878                         if ( 'undefined' === typeof section.params.menu_id ) {
 879                                 throw new Error( 'params.menu_id was not defined' );
 880                         }
 881
 882                         /*
 883                          * Since newly created sections won't be registered in PHP, we need to prevent the
 884                          * preview's sending of the activeSections to result in this control
 885                          * being deactivated when the preview refreshes. So we can hook onto
 886                          * the setting that has the same ID and its presence can dictate
 887                          * whether the section is active.
 888                          */
 889                         section.active.validate = function() {
 890                                 if ( ! api.has( section.id ) ) {
 891                                         return false;
 892                                 }
 893                                 return !! api( section.id ).get();
 894                         };
 895
 896                         section.populateControls();
 897
 898                         section.navMenuLocationSettings = {};
 899                         section.assignedLocations = new api.Value( [] );
 900
 901                         api.each(function( setting, id ) {
 902                                 var matches = id.match( /^nav_menu_locations\[(.+?)]/ );
 903                                 if ( matches ) {
 904                                         section.navMenuLocationSettings[ matches[1] ] = setting;
 905                                         setting.bind( function() {
 906                                                 section.refreshAssignedLocations();
 907                                         });
 908                                 }
 909                         });
 910
 911                         section.assignedLocations.bind(function( to ) {
 912                                 section.updateAssignedLocationsInSectionTitle( to );
 913                         });
 914
 915                         section.refreshAssignedLocations();
 916
 917                         api.bind( 'pane-contents-reflowed', function() {
 918                                 // Skip menus that have been removed.
 919                                 if ( ! section.contentContainer.parent().length ) {
 920                                         return;
 921                                 }
 922                                 section.container.find( '.menu-item .menu-item-reorder-nav button' ).attr({ 'tabindex': '0', 'aria-hidden': 'false' });
 923                                 section.container.find( '.menu-item.move-up-disabled .menus-move-up' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
 924                                 section.container.find( '.menu-item.move-down-disabled .menus-move-down' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
 925                                 section.container.find( '.menu-item.move-left-disabled .menus-move-left' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
 926                                 section.container.find( '.menu-item.move-right-disabled .menus-move-right' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
 927                         } );
 928
 929                         /**
 930                          * Update the active field class for the content container for a given checkbox toggle.
 931                          *
 932                          * @this {jQuery}
 933                          * @returns {void}
 934                          */
 935                         handleFieldActiveToggle = function() {
 936                                 var className = 'field-' + $( this ).val() + '-active';
 937                                 section.contentContainer.toggleClass( className, $( this ).prop( 'checked' ) );
 938                         };
 939                         fieldActiveToggles = api.panel( 'nav_menus' ).contentContainer.find( '.metabox-prefs:first' ).find( '.hide-column-tog' );
 940                         fieldActiveToggles.each( handleFieldActiveToggle );
 941                         fieldActiveToggles.on( 'click', handleFieldActiveToggle );
 942                 },
 943
 944                 populateControls: function() {
 945                         var section = this, menuNameControlId, menuAutoAddControlId, menuControl, menuNameControl, menuAutoAddControl;
 946
 947                         // Add the control for managing the menu name.
 948                         menuNameControlId = section.id + '[name]';
 949                         menuNameControl = api.control( menuNameControlId );
 950                         if ( ! menuNameControl ) {
 951                                 menuNameControl = new api.controlConstructor.nav_menu_name( menuNameControlId, {
 952                                         params: {
 953                                                 type: 'nav_menu_name',
 954                                                 content: '<li id="customize-control-' + section.id.replace( '[', '-' ).replace( ']', '' ) + '-name" class="customize-control customize-control-nav_menu_name"></li>', // @todo core should do this for us; see #30741
 955                                                 label: api.Menus.data.l10n.menuNameLabel,
 956                                                 active: true,
 957                                                 section: section.id,
 958                                                 priority: 0,
 959                                                 settings: {
 960                                                         'default': section.id
 961                                                 }
 962                                         }
 963                                 } );
 964                                 api.control.add( menuNameControl.id, menuNameControl );
 965                                 menuNameControl.active.set( true );
 966                         }
 967
 968                         // Add the menu control.
 969                         menuControl = api.control( section.id );
 970                         if ( ! menuControl ) {
 971                                 menuControl = new api.controlConstructor.nav_menu( section.id, {
 972                                         params: {
 973                                                 type: 'nav_menu',
 974                                                 content: '<li id="customize-control-' + section.id.replace( '[', '-' ).replace( ']', '' ) + '" class="customize-control customize-control-nav_menu"></li>', // @todo core should do this for us; see #30741
 975                                                 section: section.id,
 976                                                 priority: 998,
 977                                                 active: true,
 978                                                 settings: {
 979                                                         'default': section.id
 980                                                 },
 981                                                 menu_id: section.params.menu_id
 982                                         }
 983                                 } );
 984                                 api.control.add( menuControl.id, menuControl );
 985                                 menuControl.active.set( true );
 986                         }
 987
 988                         // Add the control for managing the menu auto_add.
 989                         menuAutoAddControlId = section.id + '[auto_add]';
 990                         menuAutoAddControl = api.control( menuAutoAddControlId );
 991                         if ( ! menuAutoAddControl ) {
 992                                 menuAutoAddControl = new api.controlConstructor.nav_menu_auto_add( menuAutoAddControlId, {
 993                                         params: {
 994                                                 type: 'nav_menu_auto_add',
 995                                                 content: '<li id="customize-control-' + section.id.replace( '[', '-' ).replace( ']', '' ) + '-auto-add" class="customize-control customize-control-nav_menu_auto_add"></li>', // @todo core should do this for us
 996                                                 label: '',
 997                                                 active: true,
 998                                                 section: section.id,
 999                                                 priority: 999,
1000                                                 settings: {
1001                                                         'default': section.id
1002                                                 }
1003                                         }
1004                                 } );
1005                                 api.control.add( menuAutoAddControl.id, menuAutoAddControl );
1006                                 menuAutoAddControl.active.set( true );
1007                         }
1008
1009                 },
1010
1011                 /**
1012                  *
1013                  */
1014                 refreshAssignedLocations: function() {
1015                         var section = this,
1016                                 menuTermId = section.params.menu_id,
1017                                 currentAssignedLocations = [];
1018                         _.each( section.navMenuLocationSettings, function( setting, themeLocation ) {
1019                                 if ( setting() === menuTermId ) {
1020                                         currentAssignedLocations.push( themeLocation );
1021                                 }
1022                         });
1023                         section.assignedLocations.set( currentAssignedLocations );
1024                 },
1025
1026                 /**
1027                  * @param {Array} themeLocationSlugs Theme location slugs.
1028                  */
1029                 updateAssignedLocationsInSectionTitle: function( themeLocationSlugs ) {
1030                         var section = this,
1031                                 $title;
1032
1033                         $title = section.container.find( '.accordion-section-title:first' );
1034                         $title.find( '.menu-in-location' ).remove();
1035                         _.each( themeLocationSlugs, function( themeLocationSlug ) {
1036                                 var $label, locationName;
1037                                 $label = $( '<span class="menu-in-location"></span>' );
1038                                 locationName = api.Menus.data.locationSlugMappedToName[ themeLocationSlug ];
1039                                 $label.text( api.Menus.data.l10n.menuLocation.replace( '%s', locationName ) );
1040                                 $title.append( $label );
1041                         });
1042
1043                         section.container.toggleClass( 'assigned-to-menu-location', 0 !== themeLocationSlugs.length );
1044
1045                 },
1046
1047                 onChangeExpanded: function( expanded, args ) {
1048                         var section = this, completeCallback;
1049
1050                         if ( expanded ) {
1051                                 wpNavMenu.menuList = section.contentContainer;
1052                                 wpNavMenu.targetList = wpNavMenu.menuList;
1053
1054                                 // Add attributes needed by wpNavMenu
1055                                 $( '#menu-to-edit' ).removeAttr( 'id' );
1056                                 wpNavMenu.menuList.attr( 'id', 'menu-to-edit' ).addClass( 'menu' );
1057
1058                                 _.each( api.section( section.id ).controls(), function( control ) {
1059                                         if ( 'nav_menu_item' === control.params.type ) {
1060                                                 control.actuallyEmbed();
1061                                         }
1062                                 } );
1063
1064                                 // Make sure Sortables is initialized after the section has been expanded to prevent `offset` issues.
1065                                 if ( args.completeCallback ) {
1066                                         completeCallback = args.completeCallback;
1067                                 }
1068                                 args.completeCallback = function() {
1069                                         if ( 'resolved' !== section.deferred.initSortables.state() ) {
1070                                                 wpNavMenu.initSortables(); // Depends on menu-to-edit ID being set above.
1071                                                 section.deferred.initSortables.resolve( wpNavMenu.menuList ); // Now MenuControl can extend the sortable.
1072
1073                                                 // @todo Note that wp.customize.reflowPaneContents() is debounced, so this immediate change will show a slight flicker while priorities get updated.
1074                                                 api.control( 'nav_menu[' + String( section.params.menu_id ) + ']' ).reflowMenuItems();
1075                                         }
1076                                         if ( _.isFunction( completeCallback ) ) {
1077                                                 completeCallback();
1078                                         }
1079                                 };
1080                         }
1081                         api.Section.prototype.onChangeExpanded.call( section, expanded, args );
1082                 }
1083         });
1084
1085         /**
1086          * wp.customize.Menus.NewMenuSection
1087          *
1088          * Customizer section for new menus.
1089          * Note that 'new_menu' must match the WP_Customize_New_Menu_Section::$type.
1090          *
1091          * @constructor
1092          * @augments wp.customize.Section
1093          */
1094         api.Menus.NewMenuSection = api.Section.extend({
1095
1096                 /**
1097                  * Add behaviors for the accordion section.
1098                  *
1099                  * @since 4.3.0
1100                  */
1101                 attachEvents: function() {
1102                         var section = this;
1103                         this.container.on( 'click', '.add-menu-toggle', function() {
1104                                 if ( section.expanded() ) {
1105                                         section.collapse();
1106                                 } else {
1107                                         section.expand();
1108                                 }
1109                         });
1110                 },
1111
1112                 /**
1113                  * Update UI to reflect expanded state.
1114                  *
1115                  * @since 4.1.0
1116                  *
1117                  * @param {Boolean} expanded
1118                  */
1119                 onChangeExpanded: function( expanded ) {
1120                         var section = this,
1121                                 button = section.container.find( '.add-menu-toggle' ),
1122                                 content = section.contentContainer,
1123                                 customizer = section.headContainer.closest( '.wp-full-overlay-sidebar-content' );
1124                         if ( expanded ) {
1125                                 button.addClass( 'open' );
1126                                 button.attr( 'aria-expanded', 'true' );
1127                                 content.slideDown( 'fast', function() {
1128                                         customizer.scrollTop( customizer.height() );
1129                                 });
1130                         } else {
1131                                 button.removeClass( 'open' );
1132                                 button.attr( 'aria-expanded', 'false' );
1133                                 content.slideUp( 'fast' );
1134                                 content.find( '.menu-name-field' ).removeClass( 'invalid' );
1135                         }
1136                 },
1137
1138                 /**
1139                  * Find the content element.
1140                  *
1141                  * @since 4.7.0
1142                  *
1143                  * @returns {jQuery} Content UL element.
1144                  */
1145                 getContent: function() {
1146                         return this.container.find( 'ul:first' );
1147                 }
1148         });
1149
1150         /**
1151          * wp.customize.Menus.MenuLocationControl
1152          *
1153          * Customizer control for menu locations (rendered as a <select>).
1154          * Note that 'nav_menu_location' must match the WP_Customize_Nav_Menu_Location_Control::$type.
1155          *
1156          * @constructor
1157          * @augments wp.customize.Control
1158          */
1159         api.Menus.MenuLocationControl = api.Control.extend({
1160                 initialize: function( id, options ) {
1161                         var control = this,
1162                                 matches = id.match( /^nav_menu_locations\[(.+?)]/ );
1163                         control.themeLocation = matches[1];
1164                         api.Control.prototype.initialize.call( control, id, options );
1165                 },
1166
1167                 ready: function() {
1168                         var control = this, navMenuIdRegex = /^nav_menu\[(-?\d+)]/;
1169
1170                         // @todo It would be better if this was added directly on the setting itself, as opposed to the control.
1171                         control.setting.validate = function( value ) {
1172                                 return parseInt( value, 10 );
1173                         };
1174
1175                         // Edit menu button.
1176                         control.container.find( '.edit-menu' ).on( 'click', function() {
1177                                 var menuId = control.setting();
1178                                 api.section( 'nav_menu[' + menuId + ']' ).focus();
1179                         });
1180                         control.setting.bind( 'change', function() {
1181                                 if ( 0 === control.setting() ) {
1182                                         control.container.find( '.edit-menu' ).addClass( 'hidden' );
1183                                 } else {
1184                                         control.container.find( '.edit-menu' ).removeClass( 'hidden' );
1185                                 }
1186                         });
1187
1188                         // Add/remove menus from the available options when they are added and removed.
1189                         api.bind( 'add', function( setting ) {
1190                                 var option, menuId, matches = setting.id.match( navMenuIdRegex );
1191                                 if ( ! matches || false === setting() ) {
1192                                         return;
1193                                 }
1194                                 menuId = matches[1];
1195                                 option = new Option( displayNavMenuName( setting().name ), menuId );
1196                                 control.container.find( 'select' ).append( option );
1197                         });
1198                         api.bind( 'remove', function( setting ) {
1199                                 var menuId, matches = setting.id.match( navMenuIdRegex );
1200                                 if ( ! matches ) {
1201                                         return;
1202                                 }
1203                                 menuId = parseInt( matches[1], 10 );
1204                                 if ( control.setting() === menuId ) {
1205                                         control.setting.set( '' );
1206                                 }
1207                                 control.container.find( 'option[value=' + menuId + ']' ).remove();
1208                         });
1209                         api.bind( 'change', function( setting ) {
1210                                 var menuId, matches = setting.id.match( navMenuIdRegex );
1211                                 if ( ! matches ) {
1212                                         return;
1213                                 }
1214                                 menuId = parseInt( matches[1], 10 );
1215                                 if ( false === setting() ) {
1216                                         if ( control.setting() === menuId ) {
1217                                                 control.setting.set( '' );
1218                                         }
1219                                         control.container.find( 'option[value=' + menuId + ']' ).remove();
1220                                 } else {
1221                                         control.container.find( 'option[value=' + menuId + ']' ).text( displayNavMenuName( setting().name ) );
1222                                 }
1223                         });
1224                 }
1225         });
1226
1227         /**
1228          * wp.customize.Menus.MenuItemControl
1229          *
1230          * Customizer control for menu items.
1231          * Note that 'menu_item' must match the WP_Customize_Menu_Item_Control::$type.
1232          *
1233          * @constructor
1234          * @augments wp.customize.Control
1235          */
1236         api.Menus.MenuItemControl = api.Control.extend({
1237
1238                 /**
1239                  * @inheritdoc
1240                  */
1241                 initialize: function( id, options ) {
1242                         var control = this;
1243                         control.expanded = new api.Value( false );
1244                         control.expandedArgumentsQueue = [];
1245                         control.expanded.bind( function( expanded ) {
1246                                 var args = control.expandedArgumentsQueue.shift();
1247                                 args = $.extend( {}, control.defaultExpandedArguments, args );
1248                                 control.onChangeExpanded( expanded, args );
1249                         });
1250                         api.Control.prototype.initialize.call( control, id, options );
1251                         control.active.validate = function() {
1252                                 var value, section = api.section( control.section() );
1253                                 if ( section ) {
1254                                         value = section.active();
1255                                 } else {
1256                                         value = false;
1257                                 }
1258                                 return value;
1259                         };
1260                 },
1261
1262                 /**
1263                  * Override the embed() method to do nothing,
1264                  * so that the control isn't embedded on load,
1265                  * unless the containing section is already expanded.
1266                  *
1267                  * @since 4.3.0
1268                  */
1269                 embed: function() {
1270                         var control = this,
1271                                 sectionId = control.section(),
1272                                 section;
1273                         if ( ! sectionId ) {
1274                                 return;
1275                         }
1276                         section = api.section( sectionId );
1277                         if ( ( section && section.expanded() ) || api.settings.autofocus.control === control.id ) {
1278                                 control.actuallyEmbed();
1279                         }
1280                 },
1281
1282                 /**
1283                  * This function is called in Section.onChangeExpanded() so the control
1284                  * will only get embedded when the Section is first expanded.
1285                  *
1286                  * @since 4.3.0
1287                  */
1288                 actuallyEmbed: function() {
1289                         var control = this;
1290                         if ( 'resolved' === control.deferred.embedded.state() ) {
1291                                 return;
1292                         }
1293                         control.renderContent();
1294                         control.deferred.embedded.resolve(); // This triggers control.ready().
1295                 },
1296
1297                 /**
1298                  * Set up the control.
1299                  */
1300                 ready: function() {
1301                         if ( 'undefined' === typeof this.params.menu_item_id ) {
1302                                 throw new Error( 'params.menu_item_id was not defined' );
1303                         }
1304
1305                         this._setupControlToggle();
1306                         this._setupReorderUI();
1307                         this._setupUpdateUI();
1308                         this._setupRemoveUI();
1309                         this._setupLinksUI();
1310                         this._setupTitleUI();
1311                 },
1312
1313                 /**
1314                  * Show/hide the settings when clicking on the menu item handle.
1315                  */
1316                 _setupControlToggle: function() {
1317                         var control = this;
1318
1319                         this.container.find( '.menu-item-handle' ).on( 'click', function( e ) {
1320                                 e.preventDefault();
1321                                 e.stopPropagation();
1322                                 var menuControl = control.getMenuControl();
1323                                 if ( menuControl.isReordering || menuControl.isSorting ) {
1324                                         return;
1325                                 }
1326                                 control.toggleForm();
1327                         } );
1328                 },
1329
1330                 /**
1331                  * Set up the menu-item-reorder-nav
1332                  */
1333                 _setupReorderUI: function() {
1334                         var control = this, template, $reorderNav;
1335
1336                         template = wp.template( 'menu-item-reorder-nav' );
1337
1338                         // Add the menu item reordering elements to the menu item control.
1339                         control.container.find( '.item-controls' ).after( template );
1340
1341                         // Handle clicks for up/down/left-right on the reorder nav.
1342                         $reorderNav = control.container.find( '.menu-item-reorder-nav' );
1343                         $reorderNav.find( '.menus-move-up, .menus-move-down, .menus-move-left, .menus-move-right' ).on( 'click', function() {
1344                                 var moveBtn = $( this );
1345                                 moveBtn.focus();
1346
1347                                 var isMoveUp = moveBtn.is( '.menus-move-up' ),
1348                                         isMoveDown = moveBtn.is( '.menus-move-down' ),
1349                                         isMoveLeft = moveBtn.is( '.menus-move-left' ),
1350                                         isMoveRight = moveBtn.is( '.menus-move-right' );
1351
1352                                 if ( isMoveUp ) {
1353                                         control.moveUp();
1354                                 } else if ( isMoveDown ) {
1355                                         control.moveDown();
1356                                 } else if ( isMoveLeft ) {
1357                                         control.moveLeft();
1358                                 } else if ( isMoveRight ) {
1359                                         control.moveRight();
1360                                 }
1361
1362                                 moveBtn.focus(); // Re-focus after the container was moved.
1363                         } );
1364                 },
1365
1366                 /**
1367                  * Set up event handlers for menu item updating.
1368                  */
1369                 _setupUpdateUI: function() {
1370                         var control = this,
1371                                 settingValue = control.setting();
1372
1373                         control.elements = {};
1374                         control.elements.url = new api.Element( control.container.find( '.edit-menu-item-url' ) );
1375                         control.elements.title = new api.Element( control.container.find( '.edit-menu-item-title' ) );
1376                         control.elements.attr_title = new api.Element( control.container.find( '.edit-menu-item-attr-title' ) );
1377                         control.elements.target = new api.Element( control.container.find( '.edit-menu-item-target' ) );
1378                         control.elements.classes = new api.Element( control.container.find( '.edit-menu-item-classes' ) );
1379                         control.elements.xfn = new api.Element( control.container.find( '.edit-menu-item-xfn' ) );
1380                         control.elements.description = new api.Element( control.container.find( '.edit-menu-item-description' ) );
1381                         // @todo allow other elements, added by plugins, to be automatically picked up here; allow additional values to be added to setting array.
1382
1383                         _.each( control.elements, function( element, property ) {
1384                                 element.bind(function( value ) {
1385                                         if ( element.element.is( 'input[type=checkbox]' ) ) {
1386                                                 value = ( value ) ? element.element.val() : '';
1387                                         }
1388
1389                                         var settingValue = control.setting();
1390                                         if ( settingValue && settingValue[ property ] !== value ) {
1391                                                 settingValue = _.clone( settingValue );
1392                                                 settingValue[ property ] = value;
1393                                                 control.setting.set( settingValue );
1394                                         }
1395                                 });
1396                                 if ( settingValue ) {
1397                                         if ( ( property === 'classes' || property === 'xfn' ) && _.isArray( settingValue[ property ] ) ) {
1398                                                 element.set( settingValue[ property ].join( ' ' ) );
1399                                         } else {
1400                                                 element.set( settingValue[ property ] );
1401                                         }
1402                                 }
1403                         });
1404
1405                         control.setting.bind(function( to, from ) {
1406                                 var itemId = control.params.menu_item_id,
1407                                         followingSiblingItemControls = [],
1408                                         childrenItemControls = [],
1409                                         menuControl;
1410
1411                                 if ( false === to ) {
1412                                         menuControl = api.control( 'nav_menu[' + String( from.nav_menu_term_id ) + ']' );
1413                                         control.container.remove();
1414
1415                                         _.each( menuControl.getMenuItemControls(), function( otherControl ) {
1416                                                 if ( from.menu_item_parent === otherControl.setting().menu_item_parent && otherControl.setting().position > from.position ) {
1417                                                         followingSiblingItemControls.push( otherControl );
1418                                                 } else if ( otherControl.setting().menu_item_parent === itemId ) {
1419                                                         childrenItemControls.push( otherControl );
1420                                                 }
1421                                         });
1422
1423                                         // Shift all following siblings by the number of children this item has.
1424                                         _.each( followingSiblingItemControls, function( followingSiblingItemControl ) {
1425                                                 var value = _.clone( followingSiblingItemControl.setting() );
1426                                                 value.position += childrenItemControls.length;
1427                                                 followingSiblingItemControl.setting.set( value );
1428                                         });
1429
1430                                         // Now move the children up to be the new subsequent siblings.
1431                                         _.each( childrenItemControls, function( childrenItemControl, i ) {
1432                                                 var value = _.clone( childrenItemControl.setting() );
1433                                                 value.position = from.position + i;
1434                                                 value.menu_item_parent = from.menu_item_parent;
1435                                                 childrenItemControl.setting.set( value );
1436                                         });
1437
1438                                         menuControl.debouncedReflowMenuItems();
1439                                 } else {
1440                                         // Update the elements' values to match the new setting properties.
1441                                         _.each( to, function( value, key ) {
1442                                                 if ( control.elements[ key] ) {
1443                                                         control.elements[ key ].set( to[ key ] );
1444                                                 }
1445                                         } );
1446                                         control.container.find( '.menu-item-data-parent-id' ).val( to.menu_item_parent );
1447
1448                                         // Handle UI updates when the position or depth (parent) change.
1449                                         if ( to.position !== from.position || to.menu_item_parent !== from.menu_item_parent ) {
1450                                                 control.getMenuControl().debouncedReflowMenuItems();
1451                                         }
1452                                 }
1453                         });
1454                 },
1455
1456                 /**
1457                  * Set up event handlers for menu item deletion.
1458                  */
1459                 _setupRemoveUI: function() {
1460                         var control = this, $removeBtn;
1461
1462                         // Configure delete button.
1463                         $removeBtn = control.container.find( '.item-delete' );
1464
1465                         $removeBtn.on( 'click', function() {
1466                                 // Find an adjacent element to add focus to when this menu item goes away
1467                                 var addingItems = true, $adjacentFocusTarget, $next, $prev;
1468
1469                                 if ( ! $( 'body' ).hasClass( 'adding-menu-items' ) ) {
1470                                         addingItems = false;
1471                                 }
1472
1473                                 $next = control.container.nextAll( '.customize-control-nav_menu_item:visible' ).first();
1474                                 $prev = control.container.prevAll( '.customize-control-nav_menu_item:visible' ).first();
1475
1476                                 if ( $next.length ) {
1477                                         $adjacentFocusTarget = $next.find( false === addingItems ? '.item-edit' : '.item-delete' ).first();
1478                                 } else if ( $prev.length ) {
1479                                         $adjacentFocusTarget = $prev.find( false === addingItems ? '.item-edit' : '.item-delete' ).first();
1480                                 } else {
1481                                         $adjacentFocusTarget = control.container.nextAll( '.customize-control-nav_menu' ).find( '.add-new-menu-item' ).first();
1482                                 }
1483
1484                                 control.container.slideUp( function() {
1485                                         control.setting.set( false );
1486                                         wp.a11y.speak( api.Menus.data.l10n.itemDeleted );
1487                                         $adjacentFocusTarget.focus(); // keyboard accessibility
1488                                 } );
1489                         } );
1490                 },
1491
1492                 _setupLinksUI: function() {
1493                         var $origBtn;
1494
1495                         // Configure original link.
1496                         $origBtn = this.container.find( 'a.original-link' );
1497
1498                         $origBtn.on( 'click', function( e ) {
1499                                 e.preventDefault();
1500                                 api.previewer.previewUrl( e.target.toString() );
1501                         } );
1502                 },
1503
1504                 /**
1505                  * Update item handle title when changed.
1506                  */
1507                 _setupTitleUI: function() {
1508                         var control = this;
1509
1510                         control.setting.bind( function( item ) {
1511                                 if ( ! item ) {
1512                                         return;
1513                                 }
1514
1515                                 var titleEl = control.container.find( '.menu-item-title' ),
1516                                     titleText = item.title || item.original_title || api.Menus.data.l10n.untitled;
1517
1518                                 if ( item._invalid ) {
1519                                         titleText = api.Menus.data.l10n.invalidTitleTpl.replace( '%s', titleText );
1520                                 }
1521
1522                                 // Don't update to an empty title.
1523                                 if ( item.title || item.original_title ) {
1524                                         titleEl
1525                                                 .text( titleText )
1526                                                 .removeClass( 'no-title' );
1527                                 } else {
1528                                         titleEl
1529                                                 .text( titleText )
1530                                                 .addClass( 'no-title' );
1531                                 }
1532                         } );
1533                 },
1534
1535                 /**
1536                  *
1537                  * @returns {number}
1538                  */
1539                 getDepth: function() {
1540                         var control = this, setting = control.setting(), depth = 0;
1541                         if ( ! setting ) {
1542                                 return 0;
1543                         }
1544                         while ( setting && setting.menu_item_parent ) {
1545                                 depth += 1;
1546                                 control = api.control( 'nav_menu_item[' + setting.menu_item_parent + ']' );
1547                                 if ( ! control ) {
1548                                         break;
1549                                 }
1550                                 setting = control.setting();
1551                         }
1552                         return depth;
1553                 },
1554
1555                 /**
1556                  * Amend the control's params with the data necessary for the JS template just in time.
1557                  */
1558                 renderContent: function() {
1559                         var control = this,
1560                                 settingValue = control.setting(),
1561                                 containerClasses;
1562
1563                         control.params.title = settingValue.title || '';
1564                         control.params.depth = control.getDepth();
1565                         control.container.data( 'item-depth', control.params.depth );
1566                         containerClasses = [
1567                                 'menu-item',
1568                                 'menu-item-depth-' + String( control.params.depth ),
1569                                 'menu-item-' + settingValue.object,
1570                                 'menu-item-edit-inactive'
1571                         ];
1572
1573                         if ( settingValue._invalid ) {
1574                                 containerClasses.push( 'menu-item-invalid' );
1575                                 control.params.title = api.Menus.data.l10n.invalidTitleTpl.replace( '%s', control.params.title );
1576                         } else if ( 'draft' === settingValue.status ) {
1577                                 containerClasses.push( 'pending' );
1578                                 control.params.title = api.Menus.data.pendingTitleTpl.replace( '%s', control.params.title );
1579                         }
1580
1581                         control.params.el_classes = containerClasses.join( ' ' );
1582                         control.params.item_type_label = settingValue.type_label;
1583                         control.params.item_type = settingValue.type;
1584                         control.params.url = settingValue.url;
1585                         control.params.target = settingValue.target;
1586                         control.params.attr_title = settingValue.attr_title;
1587                         control.params.classes = _.isArray( settingValue.classes ) ? settingValue.classes.join( ' ' ) : settingValue.classes;
1588                         control.params.attr_title = settingValue.attr_title;
1589                         control.params.xfn = settingValue.xfn;
1590                         control.params.description = settingValue.description;
1591                         control.params.parent = settingValue.menu_item_parent;
1592                         control.params.original_title = settingValue.original_title || '';
1593
1594                         control.container.addClass( control.params.el_classes );
1595
1596                         api.Control.prototype.renderContent.call( control );
1597                 },
1598
1599                 /***********************************************************************
1600                  * Begin public API methods
1601                  **********************************************************************/
1602
1603                 /**
1604                  * @return {wp.customize.controlConstructor.nav_menu|null}
1605                  */
1606                 getMenuControl: function() {
1607                         var control = this, settingValue = control.setting();
1608                         if ( settingValue && settingValue.nav_menu_term_id ) {
1609                                 return api.control( 'nav_menu[' + settingValue.nav_menu_term_id + ']' );
1610                         } else {
1611                                 return null;
1612                         }
1613                 },
1614
1615                 /**
1616                  * Expand the accordion section containing a control
1617                  */
1618                 expandControlSection: function() {
1619                         var $section = this.container.closest( '.accordion-section' );
1620                         if ( ! $section.hasClass( 'open' ) ) {
1621                                 $section.find( '.accordion-section-title:first' ).trigger( 'click' );
1622                         }
1623                 },
1624
1625                 /**
1626                  * @since 4.6.0
1627                  *
1628                  * @param {Boolean} expanded
1629                  * @param {Object} [params]
1630                  * @returns {Boolean} false if state already applied
1631                  */
1632                 _toggleExpanded: api.Section.prototype._toggleExpanded,
1633
1634                 /**
1635                  * @since 4.6.0
1636                  *
1637                  * @param {Object} [params]
1638                  * @returns {Boolean} false if already expanded
1639                  */
1640                 expand: api.Section.prototype.expand,
1641
1642                 /**
1643                  * Expand the menu item form control.
1644                  *
1645                  * @since 4.5.0 Added params.completeCallback.
1646                  *
1647                  * @param {Object}   [params] - Optional params.
1648                  * @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
1649                  */
1650                 expandForm: function( params ) {
1651                         this.expand( params );
1652                 },
1653
1654                 /**
1655                  * @since 4.6.0
1656                  *
1657                  * @param {Object} [params]
1658                  * @returns {Boolean} false if already collapsed
1659                  */
1660                 collapse: api.Section.prototype.collapse,
1661
1662                 /**
1663                  * Collapse the menu item form control.
1664                  *
1665                  * @since 4.5.0 Added params.completeCallback.
1666                  *
1667                  * @param {Object}   [params] - Optional params.
1668                  * @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
1669                  */
1670                 collapseForm: function( params ) {
1671                         this.collapse( params );
1672                 },
1673
1674                 /**
1675                  * Expand or collapse the menu item control.
1676                  *
1677                  * @deprecated this is poor naming, and it is better to directly set control.expanded( showOrHide )
1678                  * @since 4.5.0 Added params.completeCallback.
1679                  *
1680                  * @param {boolean}  [showOrHide] - If not supplied, will be inverse of current visibility
1681                  * @param {Object}   [params] - Optional params.
1682                  * @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
1683                  */
1684                 toggleForm: function( showOrHide, params ) {
1685                         if ( typeof showOrHide === 'undefined' ) {
1686                                 showOrHide = ! this.expanded();
1687                         }
1688                         if ( showOrHide ) {
1689                                 this.expand( params );
1690                         } else {
1691                                 this.collapse( params );
1692                         }
1693                 },
1694
1695                 /**
1696                  * Expand or collapse the menu item control.
1697                  *
1698                  * @since 4.6.0
1699                  * @param {boolean}  [showOrHide] - If not supplied, will be inverse of current visibility
1700                  * @param {Object}   [params] - Optional params.
1701                  * @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
1702                  */
1703                 onChangeExpanded: function( showOrHide, params ) {
1704                         var self = this, $menuitem, $inside, complete;
1705
1706                         $menuitem = this.container;
1707                         $inside = $menuitem.find( '.menu-item-settings:first' );
1708                         if ( 'undefined' === typeof showOrHide ) {
1709                                 showOrHide = ! $inside.is( ':visible' );
1710                         }
1711
1712                         // Already expanded or collapsed.
1713                         if ( $inside.is( ':visible' ) === showOrHide ) {
1714                                 if ( params && params.completeCallback ) {
1715                                         params.completeCallback();
1716                                 }
1717                                 return;
1718                         }
1719
1720                         if ( showOrHide ) {
1721                                 // Close all other menu item controls before expanding this one.
1722                                 api.control.each( function( otherControl ) {
1723                                         if ( self.params.type === otherControl.params.type && self !== otherControl ) {
1724                                                 otherControl.collapseForm();
1725                                         }
1726                                 } );
1727
1728                                 complete = function() {
1729                                         $menuitem
1730                                                 .removeClass( 'menu-item-edit-inactive' )
1731                                                 .addClass( 'menu-item-edit-active' );
1732                                         self.container.trigger( 'expanded' );
1733
1734                                         if ( params && params.completeCallback ) {
1735                                                 params.completeCallback();
1736                                         }
1737                                 };
1738
1739                                 $menuitem.find( '.item-edit' ).attr( 'aria-expanded', 'true' );
1740                                 $inside.slideDown( 'fast', complete );
1741
1742                                 self.container.trigger( 'expand' );
1743                         } else {
1744                                 complete = function() {
1745                                         $menuitem
1746                                                 .addClass( 'menu-item-edit-inactive' )
1747                                                 .removeClass( 'menu-item-edit-active' );
1748                                         self.container.trigger( 'collapsed' );
1749
1750                                         if ( params && params.completeCallback ) {
1751                                                 params.completeCallback();
1752                                         }
1753                                 };
1754
1755                                 self.container.trigger( 'collapse' );
1756
1757                                 $menuitem.find( '.item-edit' ).attr( 'aria-expanded', 'false' );
1758                                 $inside.slideUp( 'fast', complete );
1759                         }
1760                 },
1761
1762                 /**
1763                  * Expand the containing menu section, expand the form, and focus on
1764                  * the first input in the control.
1765                  *
1766                  * @since 4.5.0 Added params.completeCallback.
1767                  *
1768                  * @param {Object}   [params] - Params object.
1769                  * @param {Function} [params.completeCallback] - Optional callback function when focus has completed.
1770                  */
1771                 focus: function( params ) {
1772                         params = params || {};
1773                         var control = this, originalCompleteCallback = params.completeCallback, focusControl;
1774
1775                         focusControl = function() {
1776                                 control.expandControlSection();
1777
1778                                 params.completeCallback = function() {
1779                                         var focusable;
1780
1781                                         // Note that we can't use :focusable due to a jQuery UI issue. See: https://github.com/jquery/jquery-ui/pull/1583
1782                                         focusable = control.container.find( '.menu-item-settings' ).find( 'input, select, textarea, button, object, a[href], [tabindex]' ).filter( ':visible' );
1783                                         focusable.first().focus();
1784
1785                                         if ( originalCompleteCallback ) {
1786                                                 originalCompleteCallback();
1787                                         }
1788                                 };
1789
1790                                 control.expandForm( params );
1791                         };
1792
1793                         if ( api.section.has( control.section() ) ) {
1794                                 api.section( control.section() ).expand( {
1795                                         completeCallback: focusControl
1796                                 } );
1797                         } else {
1798                                 focusControl();
1799                         }
1800                 },
1801
1802                 /**
1803                  * Move menu item up one in the menu.
1804                  */
1805                 moveUp: function() {
1806                         this._changePosition( -1 );
1807                         wp.a11y.speak( api.Menus.data.l10n.movedUp );
1808                 },
1809
1810                 /**
1811                  * Move menu item up one in the menu.
1812                  */
1813                 moveDown: function() {
1814                         this._changePosition( 1 );
1815                         wp.a11y.speak( api.Menus.data.l10n.movedDown );
1816                 },
1817                 /**
1818                  * Move menu item and all children up one level of depth.
1819                  */
1820                 moveLeft: function() {
1821                         this._changeDepth( -1 );
1822                         wp.a11y.speak( api.Menus.data.l10n.movedLeft );
1823                 },
1824
1825                 /**
1826                  * Move menu item and children one level deeper, as a submenu of the previous item.
1827                  */
1828                 moveRight: function() {
1829                         this._changeDepth( 1 );
1830                         wp.a11y.speak( api.Menus.data.l10n.movedRight );
1831                 },
1832
1833                 /**
1834                  * Note that this will trigger a UI update, causing child items to
1835                  * move as well and cardinal order class names to be updated.
1836                  *
1837                  * @private
1838                  *
1839                  * @param {Number} offset 1|-1
1840                  */
1841                 _changePosition: function( offset ) {
1842                         var control = this,
1843                                 adjacentSetting,
1844                                 settingValue = _.clone( control.setting() ),
1845                                 siblingSettings = [],
1846                                 realPosition;
1847
1848                         if ( 1 !== offset && -1 !== offset ) {
1849                                 throw new Error( 'Offset changes by 1 are only supported.' );
1850                         }
1851
1852                         // Skip moving deleted items.
1853                         if ( ! control.setting() ) {
1854                                 return;
1855                         }
1856
1857                         // Locate the other items under the same parent (siblings).
1858                         _( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
1859                                 if ( otherControl.setting().menu_item_parent === settingValue.menu_item_parent ) {
1860                                         siblingSettings.push( otherControl.setting );
1861                                 }
1862                         });
1863                         siblingSettings.sort(function( a, b ) {
1864                                 return a().position - b().position;
1865                         });
1866
1867                         realPosition = _.indexOf( siblingSettings, control.setting );
1868                         if ( -1 === realPosition ) {
1869                                 throw new Error( 'Expected setting to be among siblings.' );
1870                         }
1871
1872                         // Skip doing anything if the item is already at the edge in the desired direction.
1873                         if ( ( realPosition === 0 && offset < 0 ) || ( realPosition === siblingSettings.length - 1 && offset > 0 ) ) {
1874                                 // @todo Should we allow a menu item to be moved up to break it out of a parent? Adopt with previous or following parent?
1875                                 return;
1876                         }
1877
1878                         // Update any adjacent menu item setting to take on this item's position.
1879                         adjacentSetting = siblingSettings[ realPosition + offset ];
1880                         if ( adjacentSetting ) {
1881                                 adjacentSetting.set( $.extend(
1882                                         _.clone( adjacentSetting() ),
1883                                         {
1884                                                 position: settingValue.position
1885                                         }
1886                                 ) );
1887                         }
1888
1889                         settingValue.position += offset;
1890                         control.setting.set( settingValue );
1891                 },
1892
1893                 /**
1894                  * Note that this will trigger a UI update, causing child items to
1895                  * move as well and cardinal order class names to be updated.
1896                  *
1897                  * @private
1898                  *
1899                  * @param {Number} offset 1|-1
1900                  */
1901                 _changeDepth: function( offset ) {
1902                         if ( 1 !== offset && -1 !== offset ) {
1903                                 throw new Error( 'Offset changes by 1 are only supported.' );
1904                         }
1905                         var control = this,
1906                                 settingValue = _.clone( control.setting() ),
1907                                 siblingControls = [],
1908                                 realPosition,
1909                                 siblingControl,
1910                                 parentControl;
1911
1912                         // Locate the other items under the same parent (siblings).
1913                         _( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
1914                                 if ( otherControl.setting().menu_item_parent === settingValue.menu_item_parent ) {
1915                                         siblingControls.push( otherControl );
1916                                 }
1917                         });
1918                         siblingControls.sort(function( a, b ) {
1919                                 return a.setting().position - b.setting().position;
1920                         });
1921
1922                         realPosition = _.indexOf( siblingControls, control );
1923                         if ( -1 === realPosition ) {
1924                                 throw new Error( 'Expected control to be among siblings.' );
1925                         }
1926
1927                         if ( -1 === offset ) {
1928                                 // Skip moving left an item that is already at the top level.
1929                                 if ( ! settingValue.menu_item_parent ) {
1930                                         return;
1931                                 }
1932
1933                                 parentControl = api.control( 'nav_menu_item[' + settingValue.menu_item_parent + ']' );
1934
1935                                 // Make this control the parent of all the following siblings.
1936                                 _( siblingControls ).chain().slice( realPosition ).each(function( siblingControl, i ) {
1937                                         siblingControl.setting.set(
1938                                                 $.extend(
1939                                                         {},
1940                                                         siblingControl.setting(),
1941                                                         {
1942                                                                 menu_item_parent: control.params.menu_item_id,
1943                                                                 position: i
1944                                                         }
1945                                                 )
1946                                         );
1947                                 });
1948
1949                                 // Increase the positions of the parent item's subsequent children to make room for this one.
1950                                 _( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
1951                                         var otherControlSettingValue, isControlToBeShifted;
1952                                         isControlToBeShifted = (
1953                                                 otherControl.setting().menu_item_parent === parentControl.setting().menu_item_parent &&
1954                                                 otherControl.setting().position > parentControl.setting().position
1955                                         );
1956                                         if ( isControlToBeShifted ) {
1957                                                 otherControlSettingValue = _.clone( otherControl.setting() );
1958                                                 otherControl.setting.set(
1959                                                         $.extend(
1960                                                                 otherControlSettingValue,
1961                                                                 { position: otherControlSettingValue.position + 1 }
1962                                                         )
1963                                                 );
1964                                         }
1965                                 });
1966
1967                                 // Make this control the following sibling of its parent item.
1968                                 settingValue.position = parentControl.setting().position + 1;
1969                                 settingValue.menu_item_parent = parentControl.setting().menu_item_parent;
1970                                 control.setting.set( settingValue );
1971
1972                         } else if ( 1 === offset ) {
1973                                 // Skip moving right an item that doesn't have a previous sibling.
1974                                 if ( realPosition === 0 ) {
1975                                         return;
1976                                 }
1977
1978                                 // Make the control the last child of the previous sibling.
1979                                 siblingControl = siblingControls[ realPosition - 1 ];
1980                                 settingValue.menu_item_parent = siblingControl.params.menu_item_id;
1981                                 settingValue.position = 0;
1982                                 _( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
1983                                         if ( otherControl.setting().menu_item_parent === settingValue.menu_item_parent ) {
1984                                                 settingValue.position = Math.max( settingValue.position, otherControl.setting().position );
1985                                         }
1986                                 });
1987                                 settingValue.position += 1;
1988                                 control.setting.set( settingValue );
1989                         }
1990                 }
1991         } );
1992
1993         /**
1994          * wp.customize.Menus.MenuNameControl
1995          *
1996          * Customizer control for a nav menu's name.
1997          *
1998          * @constructor
1999          * @augments wp.customize.Control
2000          */
2001         api.Menus.MenuNameControl = api.Control.extend({
2002
2003                 ready: function() {
2004                         var control = this,
2005                                 settingValue = control.setting();
2006
2007                         /*
2008                          * Since the control is not registered in PHP, we need to prevent the
2009                          * preview's sending of the activeControls to result in this control
2010                          * being deactivated.
2011                          */
2012                         control.active.validate = function() {
2013                                 var value, section = api.section( control.section() );
2014                                 if ( section ) {
2015                                         value = section.active();
2016                                 } else {
2017                                         value = false;
2018                                 }
2019                                 return value;
2020                         };
2021
2022                         control.nameElement = new api.Element( control.container.find( '.menu-name-field' ) );
2023
2024                         control.nameElement.bind(function( value ) {
2025                                 var settingValue = control.setting();
2026                                 if ( settingValue && settingValue.name !== value ) {
2027                                         settingValue = _.clone( settingValue );
2028                                         settingValue.name = value;
2029                                         control.setting.set( settingValue );
2030                                 }
2031                         });
2032                         if ( settingValue ) {
2033                                 control.nameElement.set( settingValue.name );
2034                         }
2035
2036                         control.setting.bind(function( object ) {
2037                                 if ( object ) {
2038                                         control.nameElement.set( object.name );
2039                                 }
2040                         });
2041                 }
2042
2043         });
2044
2045         /**
2046          * wp.customize.Menus.MenuAutoAddControl
2047          *
2048          * Customizer control for a nav menu's auto add.
2049          *
2050          * @constructor
2051          * @augments wp.customize.Control
2052          */
2053         api.Menus.MenuAutoAddControl = api.Control.extend({
2054
2055                 ready: function() {
2056                         var control = this,
2057                                 settingValue = control.setting();
2058
2059                         /*
2060                          * Since the control is not registered in PHP, we need to prevent the
2061                          * preview's sending of the activeControls to result in this control
2062                          * being deactivated.
2063                          */
2064                         control.active.validate = function() {
2065                                 var value, section = api.section( control.section() );
2066                                 if ( section ) {
2067                                         value = section.active();
2068                                 } else {
2069                                         value = false;
2070                                 }
2071                                 return value;
2072                         };
2073
2074                         control.autoAddElement = new api.Element( control.container.find( 'input[type=checkbox].auto_add' ) );
2075
2076                         control.autoAddElement.bind(function( value ) {
2077                                 var settingValue = control.setting();
2078                                 if ( settingValue && settingValue.name !== value ) {
2079                                         settingValue = _.clone( settingValue );
2080                                         settingValue.auto_add = value;
2081                                         control.setting.set( settingValue );
2082                                 }
2083                         });
2084                         if ( settingValue ) {
2085                                 control.autoAddElement.set( settingValue.auto_add );
2086                         }
2087
2088                         control.setting.bind(function( object ) {
2089                                 if ( object ) {
2090                                         control.autoAddElement.set( object.auto_add );
2091                                 }
2092                         });
2093                 }
2094
2095         });
2096
2097         /**
2098          * wp.customize.Menus.MenuControl
2099          *
2100          * Customizer control for menus.
2101          * Note that 'nav_menu' must match the WP_Menu_Customize_Control::$type
2102          *
2103          * @constructor
2104          * @augments wp.customize.Control
2105          */
2106         api.Menus.MenuControl = api.Control.extend({
2107                 /**
2108                  * Set up the control.
2109                  */
2110                 ready: function() {
2111                         var control = this,
2112                                 section = api.section( control.section() ),
2113                                 menuId = control.params.menu_id,
2114                                 menu = control.setting(),
2115                                 name,
2116                                 widgetTemplate,
2117                                 select;
2118
2119                         if ( 'undefined' === typeof this.params.menu_id ) {
2120                                 throw new Error( 'params.menu_id was not defined' );
2121                         }
2122
2123                         /*
2124                          * Since the control is not registered in PHP, we need to prevent the
2125                          * preview's sending of the activeControls to result in this control
2126                          * being deactivated.
2127                          */
2128                         control.active.validate = function() {
2129                                 var value;
2130                                 if ( section ) {
2131                                         value = section.active();
2132                                 } else {
2133                                         value = false;
2134                                 }
2135                                 return value;
2136                         };
2137
2138                         control.$controlSection = section.headContainer;
2139                         control.$sectionContent = control.container.closest( '.accordion-section-content' );
2140
2141                         this._setupModel();
2142
2143                         api.section( control.section(), function( section ) {
2144                                 section.deferred.initSortables.done(function( menuList ) {
2145                                         control._setupSortable( menuList );
2146                                 });
2147                         } );
2148
2149                         this._setupAddition();
2150                         this._setupLocations();
2151                         this._setupTitle();
2152
2153                         // Add menu to Custom Menu widgets.
2154                         if ( menu ) {
2155                                 name = displayNavMenuName( menu.name );
2156
2157                                 // Add the menu to the existing controls.
2158                                 api.control.each( function( widgetControl ) {
2159                                         if ( ! widgetControl.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== widgetControl.params.widget_id_base ) {
2160                                                 return;
2161                                         }
2162                                         widgetControl.container.find( '.nav-menu-widget-form-controls:first' ).show();
2163                                         widgetControl.container.find( '.nav-menu-widget-no-menus-message:first' ).hide();
2164
2165                                         select = widgetControl.container.find( 'select' );
2166                                         if ( 0 === select.find( 'option[value=' + String( menuId ) + ']' ).length ) {
2167                                                 select.append( new Option( name, menuId ) );
2168                                         }
2169                                 } );
2170
2171                                 // Add the menu to the widget template.
2172                                 widgetTemplate = $( '#available-widgets-list .widget-tpl:has( input.id_base[ value=nav_menu ] )' );
2173                                 widgetTemplate.find( '.nav-menu-widget-form-controls:first' ).show();
2174                                 widgetTemplate.find( '.nav-menu-widget-no-menus-message:first' ).hide();
2175                                 select = widgetTemplate.find( '.widget-inside select:first' );
2176                                 if ( 0 === select.find( 'option[value=' + String( menuId ) + ']' ).length ) {
2177                                         select.append( new Option( name, menuId ) );
2178                                 }
2179                         }
2180                 },
2181
2182                 /**
2183                  * Update ordering of menu item controls when the setting is updated.
2184                  */
2185                 _setupModel: function() {
2186                         var control = this,
2187                                 menuId = control.params.menu_id;
2188
2189                         control.setting.bind( function( to ) {
2190                                 var name;
2191                                 if ( false === to ) {
2192                                         control._handleDeletion();
2193                                 } else {
2194                                         // Update names in the Custom Menu widgets.
2195                                         name = displayNavMenuName( to.name );
2196                                         api.control.each( function( widgetControl ) {
2197                                                 if ( ! widgetControl.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== widgetControl.params.widget_id_base ) {
2198                                                         return;
2199                                                 }
2200                                                 var select = widgetControl.container.find( 'select' );
2201                                                 select.find( 'option[value=' + String( menuId ) + ']' ).text( name );
2202                                         });
2203                                 }
2204                         } );
2205
2206                         control.container.find( '.menu-delete' ).on( 'click', function( event ) {
2207                                 event.stopPropagation();
2208                                 event.preventDefault();
2209                                 control.setting.set( false );
2210                         });
2211                 },
2212
2213                 /**
2214                  * Allow items in each menu to be re-ordered, and for the order to be previewed.
2215                  *
2216                  * Notice that the UI aspects here are handled by wpNavMenu.initSortables()
2217                  * which is called in MenuSection.onChangeExpanded()
2218                  *
2219                  * @param {object} menuList - The element that has sortable().
2220                  */
2221                 _setupSortable: function( menuList ) {
2222                         var control = this;
2223
2224                         if ( ! menuList.is( control.$sectionContent ) ) {
2225                                 throw new Error( 'Unexpected menuList.' );
2226                         }
2227
2228                         menuList.on( 'sortstart', function() {
2229                                 control.isSorting = true;
2230                         });
2231
2232                         menuList.on( 'sortstop', function() {
2233                                 setTimeout( function() { // Next tick.
2234                                         var menuItemContainerIds = control.$sectionContent.sortable( 'toArray' ),
2235                                                 menuItemControls = [],
2236                                                 position = 0,
2237                                                 priority = 10;
2238
2239                                         control.isSorting = false;
2240
2241                                         // Reset horizontal scroll position when done dragging.
2242                                         control.$sectionContent.scrollLeft( 0 );
2243
2244                                         _.each( menuItemContainerIds, function( menuItemContainerId ) {
2245                                                 var menuItemId, menuItemControl, matches;
2246                                                 matches = menuItemContainerId.match( /^customize-control-nav_menu_item-(-?\d+)$/, '' );
2247                                                 if ( ! matches ) {
2248                                                         return;
2249                                                 }
2250                                                 menuItemId = parseInt( matches[1], 10 );
2251                                                 menuItemControl = api.control( 'nav_menu_item[' + String( menuItemId ) + ']' );
2252                                                 if ( menuItemControl ) {
2253                                                         menuItemControls.push( menuItemControl );
2254                                                 }
2255                                         } );
2256
2257                                         _.each( menuItemControls, function( menuItemControl ) {
2258                                                 if ( false === menuItemControl.setting() ) {
2259                                                         // Skip deleted items.
2260                                                         return;
2261                                                 }
2262                                                 var setting = _.clone( menuItemControl.setting() );
2263                                                 position += 1;
2264                                                 priority += 1;
2265                                                 setting.position = position;
2266                                                 menuItemControl.priority( priority );
2267
2268                                                 // Note that wpNavMenu will be setting this .menu-item-data-parent-id input's value.
2269                                                 setting.menu_item_parent = parseInt( menuItemControl.container.find( '.menu-item-data-parent-id' ).val(), 10 );
2270                                                 if ( ! setting.menu_item_parent ) {
2271                                                         setting.menu_item_parent = 0;
2272                                                 }
2273
2274                                                 menuItemControl.setting.set( setting );
2275                                         });
2276                                 });
2277
2278                         });
2279                         control.isReordering = false;
2280
2281                         /**
2282                          * Keyboard-accessible reordering.
2283                          */
2284                         this.container.find( '.reorder-toggle' ).on( 'click', function() {
2285                                 control.toggleReordering( ! control.isReordering );
2286                         } );
2287                 },
2288
2289                 /**
2290                  * Set up UI for adding a new menu item.
2291                  */
2292                 _setupAddition: function() {
2293                         var self = this;
2294
2295                         this.container.find( '.add-new-menu-item' ).on( 'click', function( event ) {
2296                                 if ( self.$sectionContent.hasClass( 'reordering' ) ) {
2297                                         return;
2298                                 }
2299
2300                                 if ( ! $( 'body' ).hasClass( 'adding-menu-items' ) ) {
2301                                         $( this ).attr( 'aria-expanded', 'true' );
2302                                         api.Menus.availableMenuItemsPanel.open( self );
2303                                 } else {
2304                                         $( this ).attr( 'aria-expanded', 'false' );
2305                                         api.Menus.availableMenuItemsPanel.close();
2306                                         event.stopPropagation();
2307                                 }
2308                         } );
2309                 },
2310
2311                 _handleDeletion: function() {
2312                         var control = this,
2313                                 section,
2314                                 menuId = control.params.menu_id,
2315                                 removeSection,
2316                                 widgetTemplate,
2317                                 navMenuCount = 0;
2318                         section = api.section( control.section() );
2319                         removeSection = function() {
2320                                 section.container.remove();
2321                                 api.section.remove( section.id );
2322                         };
2323
2324                         if ( section && section.expanded() ) {
2325                                 section.collapse({
2326                                         completeCallback: function() {
2327                                                 removeSection();
2328                                                 wp.a11y.speak( api.Menus.data.l10n.menuDeleted );
2329                                                 api.panel( 'nav_menus' ).focus();
2330                                         }
2331                                 });
2332                         } else {
2333                                 removeSection();
2334                         }
2335
2336                         api.each(function( setting ) {
2337                                 if ( /^nav_menu\[/.test( setting.id ) && false !== setting() ) {
2338                                         navMenuCount += 1;
2339                                 }
2340                         });
2341
2342                         // Remove the menu from any Custom Menu widgets.
2343                         api.control.each(function( widgetControl ) {
2344                                 if ( ! widgetControl.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== widgetControl.params.widget_id_base ) {
2345                                         return;
2346                                 }
2347                                 var select = widgetControl.container.find( 'select' );
2348                                 if ( select.val() === String( menuId ) ) {
2349                                         select.prop( 'selectedIndex', 0 ).trigger( 'change' );
2350                                 }
2351
2352                                 widgetControl.container.find( '.nav-menu-widget-form-controls:first' ).toggle( 0 !== navMenuCount );
2353                                 widgetControl.container.find( '.nav-menu-widget-no-menus-message:first' ).toggle( 0 === navMenuCount );
2354                                 widgetControl.container.find( 'option[value=' + String( menuId ) + ']' ).remove();
2355                         });
2356
2357                         // Remove the menu to the nav menu widget template.
2358                         widgetTemplate = $( '#available-widgets-list .widget-tpl:has( input.id_base[ value=nav_menu ] )' );
2359                         widgetTemplate.find( '.nav-menu-widget-form-controls:first' ).toggle( 0 !== navMenuCount );
2360                         widgetTemplate.find( '.nav-menu-widget-no-menus-message:first' ).toggle( 0 === navMenuCount );
2361                         widgetTemplate.find( 'option[value=' + String( menuId ) + ']' ).remove();
2362                 },
2363
2364                 // Setup theme location checkboxes.
2365                 _setupLocations: function() {
2366                         var control = this;
2367
2368                         control.container.find( '.assigned-menu-location' ).each(function() {
2369                                 var container = $( this ),
2370                                         checkbox = container.find( 'input[type=checkbox]' ),
2371                                         element,
2372                                         updateSelectedMenuLabel,
2373                                         navMenuLocationSetting = api( 'nav_menu_locations[' + checkbox.data( 'location-id' ) + ']' );
2374
2375                                 updateSelectedMenuLabel = function( selectedMenuId ) {
2376                                         var menuSetting = api( 'nav_menu[' + String( selectedMenuId ) + ']' );
2377                                         if ( ! selectedMenuId || ! menuSetting || ! menuSetting() ) {
2378                                                 container.find( '.theme-location-set' ).hide();
2379                                         } else {
2380                                                 container.find( '.theme-location-set' ).show().find( 'span' ).text( displayNavMenuName( menuSetting().name ) );
2381                                         }
2382                                 };
2383
2384                                 element = new api.Element( checkbox );
2385                                 element.set( navMenuLocationSetting.get() === control.params.menu_id );
2386
2387                                 checkbox.on( 'change', function() {
2388                                         // Note: We can't use element.bind( function( checked ){ ... } ) here because it will trigger a change as well.
2389                                         navMenuLocationSetting.set( this.checked ? control.params.menu_id : 0 );
2390                                 } );
2391
2392                                 navMenuLocationSetting.bind(function( selectedMenuId ) {
2393                                         element.set( selectedMenuId === control.params.menu_id );
2394                                         updateSelectedMenuLabel( selectedMenuId );
2395                                 });
2396                                 updateSelectedMenuLabel( navMenuLocationSetting.get() );
2397
2398                         });
2399                 },
2400
2401                 /**
2402                  * Update Section Title as menu name is changed.
2403                  */
2404                 _setupTitle: function() {
2405                         var control = this;
2406
2407                         control.setting.bind( function( menu ) {
2408                                 if ( ! menu ) {
2409                                         return;
2410                                 }
2411
2412                                 var section = api.section( control.section() ),
2413                                         menuId = control.params.menu_id,
2414                                         controlTitle = section.headContainer.find( '.accordion-section-title' ),
2415                                         sectionTitle = section.contentContainer.find( '.customize-section-title h3' ),
2416                                         location = section.headContainer.find( '.menu-in-location' ),
2417                                         action = sectionTitle.find( '.customize-action' ),
2418                                         name = displayNavMenuName( menu.name );
2419
2420                                 // Update the control title
2421                                 controlTitle.text( name );
2422                                 if ( location.length ) {
2423                                         location.appendTo( controlTitle );
2424                                 }
2425
2426                                 // Update the section title
2427                                 sectionTitle.text( name );
2428                                 if ( action.length ) {
2429                                         action.prependTo( sectionTitle );
2430                                 }
2431
2432                                 // Update the nav menu name in location selects.
2433                                 api.control.each( function( control ) {
2434                                         if ( /^nav_menu_locations\[/.test( control.id ) ) {
2435                                                 control.container.find( 'option[value=' + menuId + ']' ).text( name );
2436                                         }
2437                                 } );
2438
2439                                 // Update the nav menu name in all location checkboxes.
2440                                 section.contentContainer.find( '.customize-control-checkbox input' ).each( function() {
2441                                         if ( $( this ).prop( 'checked' ) ) {
2442                                                 $( '.current-menu-location-name-' + $( this ).data( 'location-id' ) ).text( name );
2443                                         }
2444                                 } );
2445                         } );
2446                 },
2447
2448                 /***********************************************************************
2449                  * Begin public API methods
2450                  **********************************************************************/
2451
2452                 /**
2453                  * Enable/disable the reordering UI
2454                  *
2455                  * @param {Boolean} showOrHide to enable/disable reordering
2456                  */
2457                 toggleReordering: function( showOrHide ) {
2458                         var addNewItemBtn = this.container.find( '.add-new-menu-item' ),
2459                                 reorderBtn = this.container.find( '.reorder-toggle' ),
2460                                 itemsTitle = this.$sectionContent.find( '.item-title' );
2461
2462                         showOrHide = Boolean( showOrHide );
2463
2464                         if ( showOrHide === this.$sectionContent.hasClass( 'reordering' ) ) {
2465                                 return;
2466                         }
2467
2468                         this.isReordering = showOrHide;
2469                         this.$sectionContent.toggleClass( 'reordering', showOrHide );
2470                         this.$sectionContent.sortable( this.isReordering ? 'disable' : 'enable' );
2471                         if ( this.isReordering ) {
2472                                 addNewItemBtn.attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
2473                                 reorderBtn.attr( 'aria-label', api.Menus.data.l10n.reorderLabelOff );
2474                                 wp.a11y.speak( api.Menus.data.l10n.reorderModeOn );
2475                                 itemsTitle.attr( 'aria-hidden', 'false' );
2476                         } else {
2477                                 addNewItemBtn.removeAttr( 'tabindex aria-hidden' );
2478                                 reorderBtn.attr( 'aria-label', api.Menus.data.l10n.reorderLabelOn );
2479                                 wp.a11y.speak( api.Menus.data.l10n.reorderModeOff );
2480                                 itemsTitle.attr( 'aria-hidden', 'true' );
2481                         }
2482
2483                         if ( showOrHide ) {
2484                                 _( this.getMenuItemControls() ).each( function( formControl ) {
2485                                         formControl.collapseForm();
2486                                 } );
2487                         }
2488                 },
2489
2490                 /**
2491                  * @return {wp.customize.controlConstructor.nav_menu_item[]}
2492                  */
2493                 getMenuItemControls: function() {
2494                         var menuControl = this,
2495                                 menuItemControls = [],
2496                                 menuTermId = menuControl.params.menu_id;
2497
2498                         api.control.each(function( control ) {
2499                                 if ( 'nav_menu_item' === control.params.type && control.setting() && menuTermId === control.setting().nav_menu_term_id ) {
2500                                         menuItemControls.push( control );
2501                                 }
2502                         });
2503
2504                         return menuItemControls;
2505                 },
2506
2507                 /**
2508                  * Make sure that each menu item control has the proper depth.
2509                  */
2510                 reflowMenuItems: function() {
2511                         var menuControl = this,
2512                                 menuItemControls = menuControl.getMenuItemControls(),
2513                                 reflowRecursively;
2514
2515                         reflowRecursively = function( context ) {
2516                                 var currentMenuItemControls = [],
2517                                         thisParent = context.currentParent;
2518                                 _.each( context.menuItemControls, function( menuItemControl ) {
2519                                         if ( thisParent === menuItemControl.setting().menu_item_parent ) {
2520                                                 currentMenuItemControls.push( menuItemControl );
2521                                                 // @todo We could remove this item from menuItemControls now, for efficiency.
2522                                         }
2523                                 });
2524                                 currentMenuItemControls.sort( function( a, b ) {
2525                                         return a.setting().position - b.setting().position;
2526                                 });
2527
2528                                 _.each( currentMenuItemControls, function( menuItemControl ) {
2529                                         // Update position.
2530                                         context.currentAbsolutePosition += 1;
2531                                         menuItemControl.priority.set( context.currentAbsolutePosition ); // This will change the sort order.
2532
2533                                         // Update depth.
2534                                         if ( ! menuItemControl.container.hasClass( 'menu-item-depth-' + String( context.currentDepth ) ) ) {
2535                                                 _.each( menuItemControl.container.prop( 'className' ).match( /menu-item-depth-\d+/g ), function( className ) {
2536                                                         menuItemControl.container.removeClass( className );
2537                                                 });
2538                                                 menuItemControl.container.addClass( 'menu-item-depth-' + String( context.currentDepth ) );
2539                                         }
2540                                         menuItemControl.container.data( 'item-depth', context.currentDepth );
2541
2542                                         // Process any children items.
2543                                         context.currentDepth += 1;
2544                                         context.currentParent = menuItemControl.params.menu_item_id;
2545                                         reflowRecursively( context );
2546                                         context.currentDepth -= 1;
2547                                         context.currentParent = thisParent;
2548                                 });
2549
2550                                 // Update class names for reordering controls.
2551                                 if ( currentMenuItemControls.length ) {
2552                                         _( currentMenuItemControls ).each(function( menuItemControl ) {
2553                                                 menuItemControl.container.removeClass( 'move-up-disabled move-down-disabled move-left-disabled move-right-disabled' );
2554                                                 if ( 0 === context.currentDepth ) {
2555                                                         menuItemControl.container.addClass( 'move-left-disabled' );
2556                                                 } else if ( 10 === context.currentDepth ) {
2557                                                         menuItemControl.container.addClass( 'move-right-disabled' );
2558                                                 }
2559                                         });
2560
2561                                         currentMenuItemControls[0].container
2562                                                 .addClass( 'move-up-disabled' )
2563                                                 .addClass( 'move-right-disabled' )
2564                                                 .toggleClass( 'move-down-disabled', 1 === currentMenuItemControls.length );
2565                                         currentMenuItemControls[ currentMenuItemControls.length - 1 ].container
2566                                                 .addClass( 'move-down-disabled' )
2567                                                 .toggleClass( 'move-up-disabled', 1 === currentMenuItemControls.length );
2568                                 }
2569                         };
2570
2571                         reflowRecursively( {
2572                                 menuItemControls: menuItemControls,
2573                                 currentParent: 0,
2574                                 currentDepth: 0,
2575                                 currentAbsolutePosition: 0
2576                         } );
2577
2578                         menuControl.container.find( '.reorder-toggle' ).toggle( menuItemControls.length > 1 );
2579                 },
2580
2581                 /**
2582                  * Note that this function gets debounced so that when a lot of setting
2583                  * changes are made at once, for instance when moving a menu item that
2584                  * has child items, this function will only be called once all of the
2585                  * settings have been updated.
2586                  */
2587                 debouncedReflowMenuItems: _.debounce( function() {
2588                         this.reflowMenuItems.apply( this, arguments );
2589                 }, 0 ),
2590
2591                 /**
2592                  * Add a new item to this menu.
2593                  *
2594                  * @param {object} item - Value for the nav_menu_item setting to be created.
2595                  * @returns {wp.customize.Menus.controlConstructor.nav_menu_item} The newly-created nav_menu_item control instance.
2596                  */
2597                 addItemToMenu: function( item ) {
2598                         var menuControl = this, customizeId, settingArgs, setting, menuItemControl, placeholderId, position = 0, priority = 10;
2599
2600                         _.each( menuControl.getMenuItemControls(), function( control ) {
2601                                 if ( false === control.setting() ) {
2602                                         return;
2603                                 }
2604                                 priority = Math.max( priority, control.priority() );
2605                                 if ( 0 === control.setting().menu_item_parent ) {
2606                                         position = Math.max( position, control.setting().position );
2607                                 }
2608                         });
2609                         position += 1;
2610                         priority += 1;
2611
2612                         item = $.extend(
2613                                 {},
2614                                 api.Menus.data.defaultSettingValues.nav_menu_item,
2615                                 item,
2616                                 {
2617                                         nav_menu_term_id: menuControl.params.menu_id,
2618                                         original_title: item.title,
2619                                         position: position
2620                                 }
2621                         );
2622                         delete item.id; // only used by Backbone
2623
2624                         placeholderId = api.Menus.generatePlaceholderAutoIncrementId();
2625                         customizeId = 'nav_menu_item[' + String( placeholderId ) + ']';
2626                         settingArgs = {
2627                                 type: 'nav_menu_item',
2628                                 transport: api.Menus.data.settingTransport,
2629                                 previewer: api.previewer
2630                         };
2631                         setting = api.create( customizeId, customizeId, {}, settingArgs );
2632                         setting.set( item ); // Change from initial empty object to actual item to mark as dirty.
2633
2634                         // Add the menu item control.
2635                         menuItemControl = new api.controlConstructor.nav_menu_item( customizeId, {
2636                                 params: {
2637                                         type: 'nav_menu_item',
2638                                         content: '<li id="customize-control-nav_menu_item-' + String( placeholderId ) + '" class="customize-control customize-control-nav_menu_item"></li>',
2639                                         section: menuControl.id,
2640                                         priority: priority,
2641                                         active: true,
2642                                         settings: {
2643                                                 'default': customizeId
2644                                         },
2645                                         menu_item_id: placeholderId
2646                                 },
2647                                 previewer: api.previewer
2648                         } );
2649
2650                         api.control.add( customizeId, menuItemControl );
2651                         setting.preview();
2652                         menuControl.debouncedReflowMenuItems();
2653
2654                         wp.a11y.speak( api.Menus.data.l10n.itemAdded );
2655
2656                         return menuItemControl;
2657                 }
2658         } );
2659
2660         /**
2661          * wp.customize.Menus.NewMenuControl
2662          *
2663          * Customizer control for creating new menus and handling deletion of existing menus.
2664          * Note that 'new_menu' must match the WP_Customize_New_Menu_Control::$type.
2665          *
2666          * @constructor
2667          * @augments wp.customize.Control
2668          */
2669         api.Menus.NewMenuControl = api.Control.extend({
2670                 /**
2671                  * Set up the control.
2672                  */
2673                 ready: function() {
2674                         this._bindHandlers();
2675                 },
2676
2677                 _bindHandlers: function() {
2678                         var self = this,
2679                                 name = $( '#customize-control-new_menu_name input' ),
2680                                 submit = $( '#create-new-menu-submit' );
2681                         name.on( 'keydown', function( event ) {
2682                                 if ( 13 === event.which ) { // Enter.
2683                                         self.submit();
2684                                 }
2685                         } );
2686                         submit.on( 'click', function( event ) {
2687                                 self.submit();
2688                                 event.stopPropagation();
2689                                 event.preventDefault();
2690                         } );
2691                 },
2692
2693                 /**
2694                  * Create the new menu with the name supplied.
2695                  */
2696                 submit: function() {
2697
2698                         var control = this,
2699                                 container = control.container.closest( '.accordion-section-new-menu' ),
2700                                 nameInput = container.find( '.menu-name-field' ).first(),
2701                                 name = nameInput.val(),
2702                                 menuSection,
2703                                 customizeId,
2704                                 placeholderId = api.Menus.generatePlaceholderAutoIncrementId();
2705
2706                         if ( ! name ) {
2707                                 nameInput.addClass( 'invalid' );
2708                                 nameInput.focus();
2709                                 return;
2710                         }
2711
2712                         customizeId = 'nav_menu[' + String( placeholderId ) + ']';
2713
2714                         // Register the menu control setting.
2715                         api.create( customizeId, customizeId, {}, {
2716                                 type: 'nav_menu',
2717                                 transport: api.Menus.data.settingTransport,
2718                                 previewer: api.previewer
2719                         } );
2720                         api( customizeId ).set( $.extend(
2721                                 {},
2722                                 api.Menus.data.defaultSettingValues.nav_menu,
2723                                 {
2724                                         name: name
2725                                 }
2726                         ) );
2727
2728                         /*
2729                          * Add the menu section (and its controls).
2730                          * Note that this will automatically create the required controls
2731                          * inside via the Section's ready method.
2732                          */
2733                         menuSection = new api.Menus.MenuSection( customizeId, {
2734                                 params: {
2735                                         id: customizeId,
2736                                         panel: 'nav_menus',
2737                                         title: displayNavMenuName( name ),
2738                                         customizeAction: api.Menus.data.l10n.customizingMenus,
2739                                         type: 'nav_menu',
2740                                         priority: 10,
2741                                         menu_id: placeholderId
2742                                 }
2743                         } );
2744                         api.section.add( customizeId, menuSection );
2745
2746                         // Clear name field.
2747                         nameInput.val( '' );
2748                         nameInput.removeClass( 'invalid' );
2749
2750                         wp.a11y.speak( api.Menus.data.l10n.menuAdded );
2751
2752                         // Focus on the new menu section.
2753                         api.section( customizeId ).focus(); // @todo should we focus on the new menu's control and open the add-items panel? Thinking user flow...
2754                 }
2755         });
2756
2757         /**
2758          * Extends wp.customize.controlConstructor with control constructor for
2759          * menu_location, menu_item, nav_menu, and new_menu.
2760          */
2761         $.extend( api.controlConstructor, {
2762                 nav_menu_location: api.Menus.MenuLocationControl,
2763                 nav_menu_item: api.Menus.MenuItemControl,
2764                 nav_menu: api.Menus.MenuControl,
2765                 nav_menu_name: api.Menus.MenuNameControl,
2766                 nav_menu_auto_add: api.Menus.MenuAutoAddControl,
2767                 new_menu: api.Menus.NewMenuControl
2768         });
2769
2770         /**
2771          * Extends wp.customize.panelConstructor with section constructor for menus.
2772          */
2773         $.extend( api.panelConstructor, {
2774                 nav_menus: api.Menus.MenusPanel
2775         });
2776
2777         /**
2778          * Extends wp.customize.sectionConstructor with section constructor for menu.
2779          */
2780         $.extend( api.sectionConstructor, {
2781                 nav_menu: api.Menus.MenuSection,
2782                 new_menu: api.Menus.NewMenuSection
2783         });
2784
2785         /**
2786          * Init Customizer for menus.
2787          */
2788         api.bind( 'ready', function() {
2789
2790                 // Set up the menu items panel.
2791                 api.Menus.availableMenuItemsPanel = new api.Menus.AvailableMenuItemsPanelView({
2792                         collection: api.Menus.availableMenuItems
2793                 });
2794
2795                 api.bind( 'saved', function( data ) {
2796                         if ( data.nav_menu_updates || data.nav_menu_item_updates ) {
2797                                 api.Menus.applySavedData( data );
2798                         }
2799                 } );
2800
2801                 /*
2802                  * Reset the list of posts created in the customizer once published.
2803                  * The setting is updated quietly (bypassing events being triggered)
2804                  * so that the customized state doesn't become immediately dirty.
2805                  */
2806                 api.state( 'changesetStatus' ).bind( function( status ) {
2807                         if ( 'publish' === status ) {
2808                                 api( 'nav_menus_created_posts' )._value = [];
2809                         }
2810                 } );
2811
2812                 // Open and focus menu control.
2813                 api.previewer.bind( 'focus-nav-menu-item-control', api.Menus.focusMenuItemControl );
2814         } );
2815
2816         /**
2817          * When customize_save comes back with a success, make sure any inserted
2818          * nav menus and items are properly re-added with their newly-assigned IDs.
2819          *
2820          * @param {object} data
2821          * @param {array} data.nav_menu_updates
2822          * @param {array} data.nav_menu_item_updates
2823          */
2824         api.Menus.applySavedData = function( data ) {
2825
2826                 var insertedMenuIdMapping = {}, insertedMenuItemIdMapping = {};
2827
2828                 _( data.nav_menu_updates ).each(function( update ) {
2829                         var oldCustomizeId, newCustomizeId, customizeId, oldSetting, newSetting, setting, settingValue, oldSection, newSection, wasSaved, widgetTemplate, navMenuCount;
2830                         if ( 'inserted' === update.status ) {
2831                                 if ( ! update.previous_term_id ) {
2832                                         throw new Error( 'Expected previous_term_id' );
2833                                 }
2834                                 if ( ! update.term_id ) {
2835                                         throw new Error( 'Expected term_id' );
2836                                 }
2837                                 oldCustomizeId = 'nav_menu[' + String( update.previous_term_id ) + ']';
2838                                 if ( ! api.has( oldCustomizeId ) ) {
2839                                         throw new Error( 'Expected setting to exist: ' + oldCustomizeId );
2840                                 }
2841                                 oldSetting = api( oldCustomizeId );
2842                                 if ( ! api.section.has( oldCustomizeId ) ) {
2843                                         throw new Error( 'Expected control to exist: ' + oldCustomizeId );
2844                                 }
2845                                 oldSection = api.section( oldCustomizeId );
2846
2847                                 settingValue = oldSetting.get();
2848                                 if ( ! settingValue ) {
2849                                         throw new Error( 'Did not expect setting to be empty (deleted).' );
2850                                 }
2851                                 settingValue = $.extend( _.clone( settingValue ), update.saved_value );
2852
2853                                 insertedMenuIdMapping[ update.previous_term_id ] = update.term_id;
2854                                 newCustomizeId = 'nav_menu[' + String( update.term_id ) + ']';
2855                                 newSetting = api.create( newCustomizeId, newCustomizeId, settingValue, {
2856                                         type: 'nav_menu',
2857                                         transport: api.Menus.data.settingTransport,
2858                                         previewer: api.previewer
2859                                 } );
2860
2861                                 if ( oldSection.expanded() ) {
2862                                         oldSection.collapse();
2863                                 }
2864
2865                                 // Add the menu section.
2866                                 newSection = new api.Menus.MenuSection( newCustomizeId, {
2867                                         params: {
2868                                                 id: newCustomizeId,
2869                                                 panel: 'nav_menus',
2870                                                 title: settingValue.name,
2871                                                 customizeAction: api.Menus.data.l10n.customizingMenus,
2872                                                 type: 'nav_menu',
2873                                                 priority: oldSection.priority.get(),
2874                                                 active: true,
2875                                                 menu_id: update.term_id
2876                                         }
2877                                 } );
2878
2879                                 // Add new control for the new menu.
2880                                 api.section.add( newCustomizeId, newSection );
2881
2882                                 // Update the values for nav menus in Custom Menu controls.
2883                                 api.control.each( function( setting ) {
2884                                         if ( ! setting.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== setting.params.widget_id_base ) {
2885                                                 return;
2886                                         }
2887                                         var select, oldMenuOption, newMenuOption;
2888                                         select = setting.container.find( 'select' );
2889                                         oldMenuOption = select.find( 'option[value=' + String( update.previous_term_id ) + ']' );
2890                                         newMenuOption = select.find( 'option[value=' + String( update.term_id ) + ']' );
2891                                         newMenuOption.prop( 'selected', oldMenuOption.prop( 'selected' ) );
2892                                         oldMenuOption.remove();
2893                                 } );
2894
2895                                 // Delete the old placeholder nav_menu.
2896                                 oldSetting.callbacks.disable(); // Prevent setting triggering Customizer dirty state when set.
2897                                 oldSetting.set( false );
2898                                 oldSetting.preview();
2899                                 newSetting.preview();
2900                                 oldSetting._dirty = false;
2901
2902                                 // Remove nav_menu section.
2903                                 oldSection.container.remove();
2904                                 api.section.remove( oldCustomizeId );
2905
2906                                 // Update the nav_menu widget to reflect removed placeholder menu.
2907                                 navMenuCount = 0;
2908                                 api.each(function( setting ) {
2909                                         if ( /^nav_menu\[/.test( setting.id ) && false !== setting() ) {
2910                                                 navMenuCount += 1;
2911                                         }
2912                                 });
2913                                 widgetTemplate = $( '#available-widgets-list .widget-tpl:has( input.id_base[ value=nav_menu ] )' );
2914                                 widgetTemplate.find( '.nav-menu-widget-form-controls:first' ).toggle( 0 !== navMenuCount );
2915                                 widgetTemplate.find( '.nav-menu-widget-no-menus-message:first' ).toggle( 0 === navMenuCount );
2916                                 widgetTemplate.find( 'option[value=' + String( update.previous_term_id ) + ']' ).remove();
2917
2918                                 // Update the nav_menu_locations[...] controls to remove the placeholder menus from the dropdown options.
2919                                 wp.customize.control.each(function( control ){
2920                                         if ( /^nav_menu_locations\[/.test( control.id ) ) {
2921                                                 control.container.find( 'option[value=' + String( update.previous_term_id ) + ']' ).remove();
2922                                         }
2923                                 });
2924
2925                                 // Update nav_menu_locations to reference the new ID.
2926                                 api.each( function( setting ) {
2927                                         var wasSaved = api.state( 'saved' ).get();
2928                                         if ( /^nav_menu_locations\[/.test( setting.id ) && setting.get() === update.previous_term_id ) {
2929                                                 setting.set( update.term_id );
2930                                                 setting._dirty = false; // Not dirty because this is has also just been done on server in WP_Customize_Nav_Menu_Setting::update().
2931                                                 api.state( 'saved' ).set( wasSaved );
2932                                                 setting.preview();
2933                                         }
2934                                 } );
2935
2936                                 if ( oldSection.expanded.get() ) {
2937                                         // @todo This doesn't seem to be working.
2938                                         newSection.expand();
2939                                 }
2940                         } else if ( 'updated' === update.status ) {
2941                                 customizeId = 'nav_menu[' + String( update.term_id ) + ']';
2942                                 if ( ! api.has( customizeId ) ) {
2943                                         throw new Error( 'Expected setting to exist: ' + customizeId );
2944                                 }
2945
2946                                 // Make sure the setting gets updated with its sanitized server value (specifically the conflict-resolved name).
2947                                 setting = api( customizeId );
2948                                 if ( ! _.isEqual( update.saved_value, setting.get() ) ) {
2949                                         wasSaved = api.state( 'saved' ).get();
2950                                         setting.set( update.saved_value );
2951                                         setting._dirty = false;
2952                                         api.state( 'saved' ).set( wasSaved );
2953                                 }
2954                         }
2955                 } );
2956
2957                 // Build up mapping of nav_menu_item placeholder IDs to inserted IDs.
2958                 _( data.nav_menu_item_updates ).each(function( update ) {
2959                         if ( update.previous_post_id ) {
2960                                 insertedMenuItemIdMapping[ update.previous_post_id ] = update.post_id;
2961                         }
2962                 });
2963
2964                 _( data.nav_menu_item_updates ).each(function( update ) {
2965                         var oldCustomizeId, newCustomizeId, oldSetting, newSetting, settingValue, oldControl, newControl;
2966                         if ( 'inserted' === update.status ) {
2967                                 if ( ! update.previous_post_id ) {
2968                                         throw new Error( 'Expected previous_post_id' );
2969                                 }
2970                                 if ( ! update.post_id ) {
2971                                         throw new Error( 'Expected post_id' );
2972                                 }
2973                                 oldCustomizeId = 'nav_menu_item[' + String( update.previous_post_id ) + ']';
2974                                 if ( ! api.has( oldCustomizeId ) ) {
2975                                         throw new Error( 'Expected setting to exist: ' + oldCustomizeId );
2976                                 }
2977                                 oldSetting = api( oldCustomizeId );
2978                                 if ( ! api.control.has( oldCustomizeId ) ) {
2979                                         throw new Error( 'Expected control to exist: ' + oldCustomizeId );
2980                                 }
2981                                 oldControl = api.control( oldCustomizeId );
2982
2983                                 settingValue = oldSetting.get();
2984                                 if ( ! settingValue ) {
2985                                         throw new Error( 'Did not expect setting to be empty (deleted).' );
2986                                 }
2987                                 settingValue = _.clone( settingValue );
2988
2989                                 // If the parent menu item was also inserted, update the menu_item_parent to the new ID.
2990                                 if ( settingValue.menu_item_parent < 0 ) {
2991                                         if ( ! insertedMenuItemIdMapping[ settingValue.menu_item_parent ] ) {
2992                                                 throw new Error( 'inserted ID for menu_item_parent not available' );
2993                                         }
2994                                         settingValue.menu_item_parent = insertedMenuItemIdMapping[ settingValue.menu_item_parent ];
2995                                 }
2996
2997                                 // If the menu was also inserted, then make sure it uses the new menu ID for nav_menu_term_id.
2998                                 if ( insertedMenuIdMapping[ settingValue.nav_menu_term_id ] ) {
2999                                         settingValue.nav_menu_term_id = insertedMenuIdMapping[ settingValue.nav_menu_term_id ];
3000                                 }
3001
3002                                 newCustomizeId = 'nav_menu_item[' + String( update.post_id ) + ']';
3003                                 newSetting = api.create( newCustomizeId, newCustomizeId, settingValue, {
3004                                         type: 'nav_menu_item',
3005                                         transport: api.Menus.data.settingTransport,
3006                                         previewer: api.previewer
3007                                 } );
3008
3009                                 // Add the menu control.
3010                                 newControl = new api.controlConstructor.nav_menu_item( newCustomizeId, {
3011                                         params: {
3012                                                 type: 'nav_menu_item',
3013                                                 content: '<li id="customize-control-nav_menu_item-' + String( update.post_id ) + '" class="customize-control customize-control-nav_menu_item"></li>',
3014                                                 menu_id: update.post_id,
3015                                                 section: 'nav_menu[' + String( settingValue.nav_menu_term_id ) + ']',
3016                                                 priority: oldControl.priority.get(),
3017                                                 active: true,
3018                                                 settings: {
3019                                                         'default': newCustomizeId
3020                                                 },
3021                                                 menu_item_id: update.post_id
3022                                         },
3023                                         previewer: api.previewer
3024                                 } );
3025
3026                                 // Remove old control.
3027                                 oldControl.container.remove();
3028                                 api.control.remove( oldCustomizeId );
3029
3030                                 // Add new control to take its place.
3031                                 api.control.add( newCustomizeId, newControl );
3032
3033                                 // Delete the placeholder and preview the new setting.
3034                                 oldSetting.callbacks.disable(); // Prevent setting triggering Customizer dirty state when set.
3035                                 oldSetting.set( false );
3036                                 oldSetting.preview();
3037                                 newSetting.preview();
3038                                 oldSetting._dirty = false;
3039
3040                                 newControl.container.toggleClass( 'menu-item-edit-inactive', oldControl.container.hasClass( 'menu-item-edit-inactive' ) );
3041                         }
3042                 });
3043
3044                 /*
3045                  * Update the settings for any nav_menu widgets that had selected a placeholder ID.
3046                  */
3047                 _.each( data.widget_nav_menu_updates, function( widgetSettingValue, widgetSettingId ) {
3048                         var setting = api( widgetSettingId );
3049                         if ( setting ) {
3050                                 setting._value = widgetSettingValue;
3051                                 setting.preview(); // Send to the preview now so that menu refresh will use the inserted menu.
3052                         }
3053                 });
3054         };
3055
3056         /**
3057          * Focus a menu item control.
3058          *
3059          * @param {string} menuItemId
3060          */
3061         api.Menus.focusMenuItemControl = function( menuItemId ) {
3062                 var control = api.Menus.getMenuItemControl( menuItemId );
3063                 if ( control ) {
3064                         control.focus();
3065                 }
3066         };
3067
3068         /**
3069          * Get the control for a given menu.
3070          *
3071          * @param menuId
3072          * @return {wp.customize.controlConstructor.menus[]}
3073          */
3074         api.Menus.getMenuControl = function( menuId ) {
3075                 return api.control( 'nav_menu[' + menuId + ']' );
3076         };
3077
3078         /**
3079          * Given a menu item ID, get the control associated with it.
3080          *
3081          * @param {string} menuItemId
3082          * @return {object|null}
3083          */
3084         api.Menus.getMenuItemControl = function( menuItemId ) {
3085                 return api.control( menuItemIdToSettingId( menuItemId ) );
3086         };
3087
3088         /**
3089          * @param {String} menuItemId
3090          */
3091         function menuItemIdToSettingId( menuItemId ) {
3092                 return 'nav_menu_item[' + menuItemId + ']';
3093         }
3094
3095         /**
3096          * Apply sanitize_text_field()-like logic to the supplied name, returning a
3097          * "unnammed" fallback string if the name is then empty.
3098          *
3099          * @param {string} name
3100          * @returns {string}
3101          */
3102         function displayNavMenuName( name ) {
3103                 name = name || '';
3104                 name = $( '<div>' ).text( name ).html(); // Emulate esc_html() which is used in wp-admin/nav-menus.php.
3105                 name = $.trim( name );
3106                 return name || api.Menus.data.l10n.unnamed;
3107         }
3108
3109 })( wp.customize, wp, jQuery );