wp-includes/js/customize-base.js

   1 window.wp = window.wp || {};
   2
   3 (function( exports, $ ){
   4         var api = {}, ctor, inherits,
   5                 slice = Array.prototype.slice;
   6
   7         // Shared empty constructor function to aid in prototype-chain creation.
   8         ctor = function() {};
   9
  10         /**
  11          * Helper function to correctly set up the prototype chain, for subclasses.
  12          * Similar to `goog.inherits`, but uses a hash of prototype properties and
  13          * class properties to be extended.
  14          *
  15          * @param  object parent      Parent class constructor to inherit from.
  16          * @param  object protoProps  Properties to apply to the prototype for use as class instance properties.
  17          * @param  object staticProps Properties to apply directly to the class constructor.
  18          * @return child              The subclassed constructor.
  19          */
  20         inherits = function( parent, protoProps, staticProps ) {
  21                 var child;
  22
  23                 // The constructor function for the new subclass is either defined by you
  24                 // (the "constructor" property in your `extend` definition), or defaulted
  25                 // by us to simply call `super()`.
  26                 if ( protoProps && protoProps.hasOwnProperty( 'constructor' ) ) {
  27                         child = protoProps.constructor;
  28                 } else {
  29                         child = function() {
  30                                 // Storing the result `super()` before returning the value
  31                                 // prevents a bug in Opera where, if the constructor returns
  32                                 // a function, Opera will reject the return value in favor of
  33                                 // the original object. This causes all sorts of trouble.
  34                                 var result = parent.apply( this, arguments );
  35                                 return result;
  36                         };
  37                 }
  38
  39                 // Inherit class (static) properties from parent.
  40                 $.extend( child, parent );
  41
  42                 // Set the prototype chain to inherit from `parent`, without calling
  43                 // `parent`'s constructor function.
  44                 ctor.prototype  = parent.prototype;
  45                 child.prototype = new ctor();
  46
  47                 // Add prototype properties (instance properties) to the subclass,
  48                 // if supplied.
  49                 if ( protoProps )
  50                         $.extend( child.prototype, protoProps );
  51
  52                 // Add static properties to the constructor function, if supplied.
  53                 if ( staticProps )
  54                         $.extend( child, staticProps );
  55
  56                 // Correctly set child's `prototype.constructor`.
  57                 child.prototype.constructor = child;
  58
  59                 // Set a convenience property in case the parent's prototype is needed later.
  60                 child.__super__ = parent.prototype;
  61
  62                 return child;
  63         };
  64
  65         /**
  66          * Base class for object inheritance.
  67          */
  68         api.Class = function( applicator, argsArray, options ) {
  69                 var magic, args = arguments;
  70
  71                 if ( applicator && argsArray && api.Class.applicator === applicator ) {
  72                         args = argsArray;
  73                         $.extend( this, options || {} );
  74                 }
  75
  76                 magic = this;
  77
  78                 /*
  79                  * If the class has a method called "instance",
  80                  * the return value from the class' constructor will be a function that
  81                  * calls the "instance" method.
  82                  *
  83                  * It is also an object that has properties and methods inside it.
  84                  */
  85                 if ( this.instance ) {
  86                         magic = function() {
  87                                 return magic.instance.apply( magic, arguments );
  88                         };
  89
  90                         $.extend( magic, this );
  91                 }
  92
  93                 magic.initialize.apply( magic, args );
  94                 return magic;
  95         };
  96
  97         /**
  98          * Creates a subclass of the class.
  99          *
 100          * @param  object protoProps  Properties to apply to the prototype.
 101          * @param  object staticProps Properties to apply directly to the class.
 102          * @return child              The subclass.
 103          */
 104         api.Class.extend = function( protoProps, classProps ) {
 105                 var child = inherits( this, protoProps, classProps );
 106                 child.extend = this.extend;
 107                 return child;
 108         };
 109
 110         api.Class.applicator = {};
 111
 112         /**
 113          * Initialize a class instance.
 114          *
 115          * Override this function in a subclass as needed.
 116          */
 117         api.Class.prototype.initialize = function() {};
 118
 119         /*
 120          * Checks whether a given instance extended a constructor.
 121          *
 122          * The magic surrounding the instance parameter causes the instanceof
 123          * keyword to return inaccurate results; it defaults to the function's
 124          * prototype instead of the constructor chain. Hence this function.
 125          */
 126         api.Class.prototype.extended = function( constructor ) {
 127                 var proto = this;
 128
 129                 while ( typeof proto.constructor !== 'undefined' ) {
 130                         if ( proto.constructor === constructor )
 131                                 return true;
 132                         if ( typeof proto.constructor.__super__ === 'undefined' )
 133                                 return false;
 134                         proto = proto.constructor.__super__;
 135                 }
 136                 return false;
 137         };
 138
 139         /**
 140          * An events manager object, offering the ability to bind to and trigger events.
 141          *
 142          * Used as a mixin.
 143          */
 144         api.Events = {
 145                 trigger: function( id ) {
 146                         if ( this.topics && this.topics[ id ] )
 147                                 this.topics[ id ].fireWith( this, slice.call( arguments, 1 ) );
 148                         return this;
 149                 },
 150
 151                 bind: function( id ) {
 152                         this.topics = this.topics || {};
 153                         this.topics[ id ] = this.topics[ id ] || $.Callbacks();
 154                         this.topics[ id ].add.apply( this.topics[ id ], slice.call( arguments, 1 ) );
 155                         return this;
 156                 },
 157
 158                 unbind: function( id ) {
 159                         if ( this.topics && this.topics[ id ] )
 160                                 this.topics[ id ].remove.apply( this.topics[ id ], slice.call( arguments, 1 ) );
 161                         return this;
 162                 }
 163         };
 164
 165         /**
 166          * Observable values that support two-way binding.
 167          *
 168          * @constructor
 169          */
 170         api.Value = api.Class.extend({
 171                 /**
 172                  * @param {mixed}  initial The initial value.
 173                  * @param {object} options
 174                  */
 175                 initialize: function( initial, options ) {
 176                         this._value = initial; // @todo: potentially change this to a this.set() call.
 177                         this.callbacks = $.Callbacks();
 178                         this._dirty = false;
 179
 180                         $.extend( this, options || {} );
 181
 182                         this.set = $.proxy( this.set, this );
 183                 },
 184
 185                 /*
 186                  * Magic. Returns a function that will become the instance.
 187                  * Set to null to prevent the instance from extending a function.
 188                  */
 189                 instance: function() {
 190                         return arguments.length ? this.set.apply( this, arguments ) : this.get();
 191                 },
 192
 193                 /**
 194                  * Get the value.
 195                  *
 196                  * @return {mixed}
 197                  */
 198                 get: function() {
 199                         return this._value;
 200                 },
 201
 202                 /**
 203                  * Set the value and trigger all bound callbacks.
 204                  *
 205                  * @param {object} to New value.
 206                  */
 207                 set: function( to ) {
 208                         var from = this._value;
 209
 210                         to = this._setter.apply( this, arguments );
 211                         to = this.validate( to );
 212
 213                         // Bail if the sanitized value is null or unchanged.
 214                         if ( null === to || _.isEqual( from, to ) ) {
 215                                 return this;
 216                         }
 217
 218                         this._value = to;
 219                         this._dirty = true;
 220
 221                         this.callbacks.fireWith( this, [ to, from ] );
 222
 223                         return this;
 224                 },
 225
 226                 _setter: function( to ) {
 227                         return to;
 228                 },
 229
 230                 setter: function( callback ) {
 231                         var from = this.get();
 232                         this._setter = callback;
 233                         // Temporarily clear value so setter can decide if it's valid.
 234                         this._value = null;
 235                         this.set( from );
 236                         return this;
 237                 },
 238
 239                 resetSetter: function() {
 240                         this._setter = this.constructor.prototype._setter;
 241                         this.set( this.get() );
 242                         return this;
 243                 },
 244
 245                 validate: function( value ) {
 246                         return value;
 247                 },
 248
 249                 /**
 250                  * Bind a function to be invoked whenever the value changes.
 251                  *
 252                  * @param {...Function} A function, or multiple functions, to add to the callback stack.
 253                  */
 254                 bind: function() {
 255                         this.callbacks.add.apply( this.callbacks, arguments );
 256                         return this;
 257                 },
 258
 259                 /**
 260                  * Unbind a previously bound function.
 261                  *
 262                  * @param {...Function} A function, or multiple functions, to remove from the callback stack.
 263                  */
 264                 unbind: function() {
 265                         this.callbacks.remove.apply( this.callbacks, arguments );
 266                         return this;
 267                 },
 268
 269                 link: function() { // values*
 270                         var set = this.set;
 271                         $.each( arguments, function() {
 272                                 this.bind( set );
 273                         });
 274                         return this;
 275                 },
 276
 277                 unlink: function() { // values*
 278                         var set = this.set;
 279                         $.each( arguments, function() {
 280                                 this.unbind( set );
 281                         });
 282                         return this;
 283                 },
 284
 285                 sync: function() { // values*
 286                         var that = this;
 287                         $.each( arguments, function() {
 288                                 that.link( this );
 289                                 this.link( that );
 290                         });
 291                         return this;
 292                 },
 293
 294                 unsync: function() { // values*
 295                         var that = this;
 296                         $.each( arguments, function() {
 297                                 that.unlink( this );
 298                                 this.unlink( that );
 299                         });
 300                         return this;
 301                 }
 302         });
 303
 304         /**
 305          * A collection of observable values.
 306          *
 307          * @constructor
 308          * @augments wp.customize.Class
 309          * @mixes wp.customize.Events
 310          */
 311         api.Values = api.Class.extend({
 312
 313                 /**
 314                  * The default constructor for items of the collection.
 315                  *
 316                  * @type {object}
 317                  */
 318                 defaultConstructor: api.Value,
 319
 320                 initialize: function( options ) {
 321                         $.extend( this, options || {} );
 322
 323                         this._value = {};
 324                         this._deferreds = {};
 325                 },
 326
 327                 /**
 328                  * Get the instance of an item from the collection if only ID is specified.
 329                  *
 330                  * If more than one argument is supplied, all are expected to be IDs and
 331                  * the last to be a function callback that will be invoked when the requested
 332                  * items are available.
 333                  *
 334                  * @see {api.Values.when}
 335                  *
 336                  * @param  {string}   id ID of the item.
 337                  * @param  {...}         Zero or more IDs of items to wait for and a callback
 338                  *                       function to invoke when they're available. Optional.
 339                  * @return {mixed}    The item instance if only one ID was supplied.
 340                  *                    A Deferred Promise object if a callback function is supplied.
 341                  */
 342                 instance: function( id ) {
 343                         if ( arguments.length === 1 )
 344                                 return this.value( id );
 345
 346                         return this.when.apply( this, arguments );
 347                 },
 348
 349                 /**
 350                  * Get the instance of an item.
 351                  *
 352                  * @param  {string} id The ID of the item.
 353                  * @return {[type]}    [description]
 354                  */
 355                 value: function( id ) {
 356                         return this._value[ id ];
 357                 },
 358
 359                 /**
 360                  * Whether the collection has an item with the given ID.
 361                  *
 362                  * @param  {string}  id The ID of the item to look for.
 363                  * @return {Boolean}
 364                  */
 365                 has: function( id ) {
 366                         return typeof this._value[ id ] !== 'undefined';
 367                 },
 368
 369                 /**
 370                  * Add an item to the collection.
 371                  *
 372                  * @param {string} id    The ID of the item.
 373                  * @param {mixed}  value The item instance.
 374                  * @return {mixed} The new item's instance.
 375                  */
 376                 add: function( id, value ) {
 377                         if ( this.has( id ) )
 378                                 return this.value( id );
 379
 380                         this._value[ id ] = value;
 381                         value.parent = this;
 382
 383                         // Propagate a 'change' event on an item up to the collection.
 384                         if ( value.extended( api.Value ) )
 385                                 value.bind( this._change );
 386
 387                         this.trigger( 'add', value );
 388
 389                         // If a deferred object exists for this item,
 390                         // resolve it.
 391                         if ( this._deferreds[ id ] )
 392                                 this._deferreds[ id ].resolve();
 393
 394                         return this._value[ id ];
 395                 },
 396
 397                 /**
 398                  * Create a new item of the collection using the collection's default constructor
 399                  * and store it in the collection.
 400                  *
 401                  * @param  {string} id    The ID of the item.
 402                  * @param  {mixed}  value Any extra arguments are passed into the item's initialize method.
 403                  * @return {mixed}  The new item's instance.
 404                  */
 405                 create: function( id ) {
 406                         return this.add( id, new this.defaultConstructor( api.Class.applicator, slice.call( arguments, 1 ) ) );
 407                 },
 408
 409                 /**
 410                  * Iterate over all items in the collection invoking the provided callback.
 411                  *
 412                  * @param  {Function} callback Function to invoke.
 413                  * @param  {object}   context  Object context to invoke the function with. Optional.
 414                  */
 415                 each: function( callback, context ) {
 416                         context = typeof context === 'undefined' ? this : context;
 417
 418                         $.each( this._value, function( key, obj ) {
 419                                 callback.call( context, obj, key );
 420                         });
 421                 },
 422
 423                 /**
 424                  * Remove an item from the collection.
 425                  *
 426                  * @param  {string} id The ID of the item to remove.
 427                  */
 428                 remove: function( id ) {
 429                         var value;
 430
 431                         if ( this.has( id ) ) {
 432                                 value = this.value( id );
 433                                 this.trigger( 'remove', value );
 434                                 if ( value.extended( api.Value ) )
 435                                         value.unbind( this._change );
 436                                 delete value.parent;
 437                         }
 438
 439                         delete this._value[ id ];
 440                         delete this._deferreds[ id ];
 441                 },
 442
 443                 /**
 444                  * Runs a callback once all requested values exist.
 445                  *
 446                  * when( ids*, [callback] );
 447                  *
 448                  * For example:
 449                  *     when( id1, id2, id3, function( value1, value2, value3 ) {} );
 450                  *
 451                  * @returns $.Deferred.promise();
 452                  */
 453                 when: function() {
 454                         var self = this,
 455                                 ids  = slice.call( arguments ),
 456                                 dfd  = $.Deferred();
 457
 458                         // If the last argument is a callback, bind it to .done()
 459                         if ( $.isFunction( ids[ ids.length - 1 ] ) )
 460                                 dfd.done( ids.pop() );
 461
 462                         /*
 463                          * Create a stack of deferred objects for each item that is not
 464                          * yet available, and invoke the supplied callback when they are.
 465                          */
 466                         $.when.apply( $, $.map( ids, function( id ) {
 467                                 if ( self.has( id ) )
 468                                         return;
 469
 470                                 /*
 471                                  * The requested item is not available yet, create a deferred
 472                                  * object to resolve when it becomes available.
 473                                  */
 474                                 return self._deferreds[ id ] = self._deferreds[ id ] || $.Deferred();
 475                         })).done( function() {
 476                                 var values = $.map( ids, function( id ) {
 477                                                 return self( id );
 478                                         });
 479
 480                                 // If a value is missing, we've used at least one expired deferred.
 481                                 // Call Values.when again to generate a new deferred.
 482                                 if ( values.length !== ids.length ) {
 483                                         // ids.push( callback );
 484                                         self.when.apply( self, ids ).done( function() {
 485                                                 dfd.resolveWith( self, values );
 486                                         });
 487                                         return;
 488                                 }
 489
 490                                 dfd.resolveWith( self, values );
 491                         });
 492
 493                         return dfd.promise();
 494                 },
 495
 496                 /**
 497                  * A helper function to propagate a 'change' event from an item
 498                  * to the collection itself.
 499                  */
 500                 _change: function() {
 501                         this.parent.trigger( 'change', this );
 502                 }
 503         });
 504
 505         // Create a global events bus on the Customizer.
 506         $.extend( api.Values.prototype, api.Events );
 507
 508
 509         /**
 510          * Cast a string to a jQuery collection if it isn't already.
 511          *
 512          * @param {string|jQuery collection} element
 513          */
 514         api.ensure = function( element ) {
 515                 return typeof element == 'string' ? $( element ) : element;
 516         };
 517
 518         /**
 519          * An observable value that syncs with an element.
 520          *
 521          * Handles inputs, selects, and textareas by default.
 522          *
 523          * @constructor
 524          * @augments wp.customize.Value
 525          * @augments wp.customize.Class
 526          */
 527         api.Element = api.Value.extend({
 528                 initialize: function( element, options ) {
 529                         var self = this,
 530                                 synchronizer = api.Element.synchronizer.html,
 531                                 type, update, refresh;
 532
 533                         this.element = api.ensure( element );
 534                         this.events = '';
 535
 536                         if ( this.element.is('input, select, textarea') ) {
 537                                 this.events += 'change';
 538                                 synchronizer = api.Element.synchronizer.val;
 539
 540                                 if ( this.element.is('input') ) {
 541                                         type = this.element.prop('type');
 542                                         if ( api.Element.synchronizer[ type ] ) {
 543                                                 synchronizer = api.Element.synchronizer[ type ];
 544                                         }
 545                                         if ( 'text' === type || 'password' === type ) {
 546                                                 this.events += ' keyup';
 547                                         } else if ( 'range' === type ) {
 548                                                 this.events += ' input propertychange';
 549                                         }
 550                                 } else if ( this.element.is('textarea') ) {
 551                                         this.events += ' keyup';
 552                                 }
 553                         }
 554
 555                         api.Value.prototype.initialize.call( this, null, $.extend( options || {}, synchronizer ) );
 556                         this._value = this.get();
 557
 558                         update  = this.update;
 559                         refresh = this.refresh;
 560
 561                         this.update = function( to ) {
 562                                 if ( to !== refresh.call( self ) )
 563                                         update.apply( this, arguments );
 564                         };
 565                         this.refresh = function() {
 566                                 self.set( refresh.call( self ) );
 567                         };
 568
 569                         this.bind( this.update );
 570                         this.element.bind( this.events, this.refresh );
 571                 },
 572
 573                 find: function( selector ) {
 574                         return $( selector, this.element );
 575                 },
 576
 577                 refresh: function() {},
 578
 579                 update: function() {}
 580         });
 581
 582         api.Element.synchronizer = {};
 583
 584         $.each( [ 'html', 'val' ], function( index, method ) {
 585                 api.Element.synchronizer[ method ] = {
 586                         update: function( to ) {
 587                                 this.element[ method ]( to );
 588                         },
 589                         refresh: function() {
 590                                 return this.element[ method ]();
 591                         }
 592                 };
 593         });
 594
 595         api.Element.synchronizer.checkbox = {
 596                 update: function( to ) {
 597                         this.element.prop( 'checked', to );
 598                 },
 599                 refresh: function() {
 600                         return this.element.prop( 'checked' );
 601                 }
 602         };
 603
 604         api.Element.synchronizer.radio = {
 605                 update: function( to ) {
 606                         this.element.filter( function() {
 607                                 return this.value === to;
 608                         }).prop( 'checked', true );
 609                 },
 610                 refresh: function() {
 611                         return this.element.filter( ':checked' ).val();
 612                 }
 613         };
 614
 615         $.support.postMessage = !! window.postMessage;
 616
 617         /**
 618          * A communicator for sending data from one window to another over postMessage.
 619          *
 620          * @constructor
 621          * @augments wp.customize.Class
 622          * @mixes wp.customize.Events
 623          */
 624         api.Messenger = api.Class.extend({
 625                 /**
 626                  * Create a new Value.
 627                  *
 628                  * @param  {string} key     Unique identifier.
 629                  * @param  {mixed}  initial Initial value.
 630                  * @param  {mixed}  options Options hash. Optional.
 631                  * @return {Value}          Class instance of the Value.
 632                  */
 633                 add: function( key, initial, options ) {
 634                         return this[ key ] = new api.Value( initial, options );
 635                 },
 636
 637                 /**
 638                  * Initialize Messenger.
 639                  *
 640                  * @param  {object} params - Parameters to configure the messenger.
 641                  *         {string} params.url - The URL to communicate with.
 642                  *         {window} params.targetWindow - The window instance to communicate with. Default window.parent.
 643                  *         {string} params.channel - If provided, will send the channel with each message and only accept messages a matching channel.
 644                  * @param  {object} options - Extend any instance parameter or method with this object.
 645                  */
 646                 initialize: function( params, options ) {
 647                         // Target the parent frame by default, but only if a parent frame exists.
 648                         var defaultTarget = window.parent === window ? null : window.parent;
 649
 650                         $.extend( this, options || {} );
 651
 652                         this.add( 'channel', params.channel );
 653                         this.add( 'url', params.url || '' );
 654                         this.add( 'origin', this.url() ).link( this.url ).setter( function( to ) {
 655                                 var urlParser = document.createElement( 'a' );
 656                                 urlParser.href = to;
 657                                 // Port stripping needed by IE since it adds to host but not to event.origin.
 658                                 return urlParser.protocol + '//' + urlParser.host.replace( /:80$/, '' );
 659                         });
 660
 661                         // first add with no value
 662                         this.add( 'targetWindow', null );
 663                         // This avoids SecurityErrors when setting a window object in x-origin iframe'd scenarios.
 664                         this.targetWindow.set = function( to ) {
 665                                 var from = this._value;
 666
 667                                 to = this._setter.apply( this, arguments );
 668                                 to = this.validate( to );
 669
 670                                 if ( null === to || from === to ) {
 671                                         return this;
 672                                 }
 673
 674                                 this._value = to;
 675                                 this._dirty = true;
 676
 677                                 this.callbacks.fireWith( this, [ to, from ] );
 678
 679                                 return this;
 680                         };
 681                         // now set it
 682                         this.targetWindow( params.targetWindow || defaultTarget );
 683
 684
 685                         // Since we want jQuery to treat the receive function as unique
 686                         // to this instance, we give the function a new guid.
 687                         //
 688                         // This will prevent every Messenger's receive function from being
 689                         // unbound when calling $.off( 'message', this.receive );
 690                         this.receive = $.proxy( this.receive, this );
 691                         this.receive.guid = $.guid++;
 692
 693                         $( window ).on( 'message', this.receive );
 694                 },
 695
 696                 destroy: function() {
 697                         $( window ).off( 'message', this.receive );
 698                 },
 699
 700                 /**
 701                  * Receive data from the other window.
 702                  *
 703                  * @param  {jQuery.Event} event Event with embedded data.
 704                  */
 705                 receive: function( event ) {
 706                         var message;
 707
 708                         event = event.originalEvent;
 709
 710                         if ( ! this.targetWindow || ! this.targetWindow() ) {
 711                                 return;
 712                         }
 713
 714                         // Check to make sure the origin is valid.
 715                         if ( this.origin() && event.origin !== this.origin() )
 716                                 return;
 717
 718                         // Ensure we have a string that's JSON.parse-able
 719                         if ( typeof event.data !== 'string' || event.data[0] !== '{' ) {
 720                                 return;
 721                         }
 722
 723                         message = JSON.parse( event.data );
 724
 725                         // Check required message properties.
 726                         if ( ! message || ! message.id || typeof message.data === 'undefined' )
 727                                 return;
 728
 729                         // Check if channel names match.
 730                         if ( ( message.channel || this.channel() ) && this.channel() !== message.channel )
 731                                 return;
 732
 733                         this.trigger( message.id, message.data );
 734                 },
 735
 736                 /**
 737                  * Send data to the other window.
 738                  *
 739                  * @param  {string} id   The event name.
 740                  * @param  {object} data Data.
 741                  */
 742                 send: function( id, data ) {
 743                         var message;
 744
 745                         data = typeof data === 'undefined' ? null : data;
 746
 747                         if ( ! this.url() || ! this.targetWindow() )
 748                                 return;
 749
 750                         message = { id: id, data: data };
 751                         if ( this.channel() )
 752                                 message.channel = this.channel();
 753
 754                         this.targetWindow().postMessage( JSON.stringify( message ), this.origin() );
 755                 }
 756         });
 757
 758         // Add the Events mixin to api.Messenger.
 759         $.extend( api.Messenger.prototype, api.Events );
 760
 761         /**
 762          * Notification.
 763          *
 764          * @class
 765          * @augments wp.customize.Class
 766          * @since 4.6.0
 767          *
 768          * @param {string}  code - The error code.
 769          * @param {object}  params - Params.
 770          * @param {string}  params.message=null - The error message.
 771          * @param {string}  [params.type=error] - The notification type.
 772          * @param {boolean} [params.fromServer=false] - Whether the notification was server-sent.
 773          * @param {string}  [params.setting=null] - The setting ID that the notification is related to.
 774          * @param {*}       [params.data=null] - Any additional data.
 775          */
 776         api.Notification = api.Class.extend({
 777                 initialize: function( code, params ) {
 778                         var _params;
 779                         this.code = code;
 780                         _params = _.extend(
 781                                 {
 782                                         message: null,
 783                                         type: 'error',
 784                                         fromServer: false,
 785                                         data: null,
 786                                         setting: null
 787                                 },
 788                                 params
 789                         );
 790                         delete _params.code;
 791                         _.extend( this, _params );
 792                 }
 793         });
 794
 795         // The main API object is also a collection of all customizer settings.
 796         api = $.extend( new api.Values(), api );
 797
 798         /**
 799          * Get all customize settings.
 800          *
 801          * @return {object}
 802          */
 803         api.get = function() {
 804                 var result = {};
 805
 806                 this.each( function( obj, key ) {
 807                         result[ key ] = obj.get();
 808                 });
 809
 810                 return result;
 811         };
 812
 813         /**
 814          * Utility function namespace
 815          */
 816         api.utils = {};
 817
 818         /**
 819          * Parse query string.
 820          *
 821          * @since 4.7.0
 822          * @access public
 823          *
 824          * @param {string} queryString Query string.
 825          * @returns {object} Parsed query string.
 826          */
 827         api.utils.parseQueryString = function parseQueryString( queryString ) {
 828                 var queryParams = {};
 829                 _.each( queryString.split( '&' ), function( pair ) {
 830                         var parts, key, value;
 831                         parts = pair.split( '=', 2 );
 832                         if ( ! parts[0] ) {
 833                                 return;
 834                         }
 835                         key = decodeURIComponent( parts[0].replace( /\+/g, ' ' ) );
 836                         key = key.replace( / /g, '_' ); // What PHP does.
 837                         if ( _.isUndefined( parts[1] ) ) {
 838                                 value = null;
 839                         } else {
 840                                 value = decodeURIComponent( parts[1].replace( /\+/g, ' ' ) );
 841                         }
 842                         queryParams[ key ] = value;
 843                 } );
 844                 return queryParams;
 845         };
 846
 847         // Expose the API publicly on window.wp.customize
 848         exports.customize = api;
 849 })( wp, jQuery );