wp-content/themes/twentyfifteen/js/functions.js

   1 /* global screenReaderText */
   2 /**
   3  * Theme functions file.
   4  *
   5  * Contains handlers for navigation and widget area.
   6  */
   7
   8 ( function( $ ) {
   9         var $body, $window, $sidebar, adminbarOffset, top = false,
  10             bottom = false, windowWidth, windowHeight, lastWindowPos = 0,
  11             topOffset = 0, bodyHeight, sidebarHeight, resizeTimer,
  12             secondary, button;
  13
  14         function initMainNavigation( container ) {
  15                 // Add dropdown toggle that display child menu items.
  16                 container.find( '.menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );
  17
  18                 // Toggle buttons and submenu items with active children menu items.
  19                 container.find( '.current-menu-ancestor > button' ).addClass( 'toggle-on' );
  20                 container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
  21
  22                 container.find( '.dropdown-toggle' ).click( function( e ) {
  23                         var _this = $( this );
  24                         e.preventDefault();
  25                         _this.toggleClass( 'toggle-on' );
  26                         _this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
  27                         _this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
  28                         _this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
  29                 } );
  30         }
  31         initMainNavigation( $( '.main-navigation' ) );
  32
  33         // Re-initialize the main navigation when it is updated, persisting any existing submenu expanded states.
  34         $( document ).on( 'customize-preview-menu-refreshed', function( e, params ) {
  35                 if ( 'primary' === params.wpNavMenuArgs.theme_location ) {
  36                         initMainNavigation( params.newContainer );
  37
  38                         // Re-sync expanded states from oldContainer.
  39                         params.oldContainer.find( '.dropdown-toggle.toggle-on' ).each(function() {
  40                                 var containerId = $( this ).parent().prop( 'id' );
  41                                 $( params.newContainer ).find( '#' + containerId + ' > .dropdown-toggle' ).triggerHandler( 'click' );
  42                         });
  43                 }
  44         });
  45
  46         secondary = $( '#secondary' );
  47         button = $( '.site-branding' ).find( '.secondary-toggle' );
  48
  49         // Enable menu toggle for small screens.
  50         ( function() {
  51                 var menu, widgets, social;
  52                 if ( ! secondary.length || ! button.length ) {
  53                         return;
  54                 }
  55
  56                 // Hide button if there are no widgets and the menus are missing or empty.
  57                 menu    = secondary.find( '.nav-menu' );
  58                 widgets = secondary.find( '#widget-area' );
  59                 social  = secondary.find( '#social-navigation' );
  60                 if ( ! widgets.length && ! social.length && ( ! menu.length || ! menu.children().length ) ) {
  61                         button.hide();
  62                         return;
  63                 }
  64
  65                 button.on( 'click.twentyfifteen', function() {
  66                         secondary.toggleClass( 'toggled-on' );
  67                         secondary.trigger( 'resize' );
  68                         $( this ).toggleClass( 'toggled-on' );
  69                         if ( $( this, secondary ).hasClass( 'toggled-on' ) ) {
  70                                 $( this ).attr( 'aria-expanded', 'true' );
  71                                 secondary.attr( 'aria-expanded', 'true' );
  72                         } else {
  73                                 $( this ).attr( 'aria-expanded', 'false' );
  74                                 secondary.attr( 'aria-expanded', 'false' );
  75                         }
  76                 } );
  77         } )();
  78
  79         /**
  80          * @summary Add or remove ARIA attributes.
  81          * Uses jQuery's width() function to determine the size of the window and add
  82          * the default ARIA attributes for the menu toggle if it's visible.
  83          * @since Twenty Fifteen 1.1
  84          */
  85         function onResizeARIA() {
  86                 if ( 955 > $window.width() ) {
  87                         button.attr( 'aria-expanded', 'false' );
  88                         secondary.attr( 'aria-expanded', 'false' );
  89                         button.attr( 'aria-controls', 'secondary' );
  90                 } else {
  91                         button.removeAttr( 'aria-expanded' );
  92                         secondary.removeAttr( 'aria-expanded' );
  93                         button.removeAttr( 'aria-controls' );
  94                 }
  95         }
  96
  97         // Sidebar scrolling.
  98         function resize() {
  99                 windowWidth = $window.width();
 100
 101                 if ( 955 > windowWidth ) {
 102                         top = bottom = false;
 103                         $sidebar.removeAttr( 'style' );
 104                 }
 105         }
 106
 107         function scroll() {
 108                 var windowPos = $window.scrollTop();
 109
 110                 if ( 955 > windowWidth ) {
 111                         return;
 112                 }
 113
 114                 sidebarHeight = $sidebar.height();
 115                 windowHeight  = $window.height();
 116                 bodyHeight    = $body.height();
 117
 118                 if ( sidebarHeight + adminbarOffset > windowHeight ) {
 119                         if ( windowPos > lastWindowPos ) {
 120                                 if ( top ) {
 121                                         top = false;
 122                                         topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
 123                                         $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
 124                                 } else if ( ! bottom && windowPos + windowHeight > sidebarHeight + $sidebar.offset().top && sidebarHeight + adminbarOffset < bodyHeight ) {
 125                                         bottom = true;
 126                                         $sidebar.attr( 'style', 'position: fixed; bottom: 0;' );
 127                                 }
 128                         } else if ( windowPos < lastWindowPos ) {
 129                                 if ( bottom ) {
 130                                         bottom = false;
 131                                         topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
 132                                         $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
 133                                 } else if ( ! top && windowPos + adminbarOffset < $sidebar.offset().top ) {
 134                                         top = true;
 135                                         $sidebar.attr( 'style', 'position: fixed;' );
 136                                 }
 137                         } else {
 138                                 top = bottom = false;
 139                                 topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
 140                                 $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
 141                         }
 142                 } else if ( ! top ) {
 143                         top = true;
 144                         $sidebar.attr( 'style', 'position: fixed;' );
 145                 }
 146
 147                 lastWindowPos = windowPos;
 148         }
 149
 150         function resizeAndScroll() {
 151                 resize();
 152                 scroll();
 153         }
 154
 155         $( document ).ready( function() {
 156                 $body          = $( document.body );
 157                 $window        = $( window );
 158                 $sidebar       = $( '#sidebar' ).first();
 159                 adminbarOffset = $body.is( '.admin-bar' ) ? $( '#wpadminbar' ).height() : 0;
 160
 161                 $window
 162                         .on( 'scroll.twentyfifteen', scroll )
 163                         .on( 'load.twentyfifteen', onResizeARIA )
 164                         .on( 'resize.twentyfifteen', function() {
 165                                 clearTimeout( resizeTimer );
 166                                 resizeTimer = setTimeout( resizeAndScroll, 500 );
 167                                 onResizeARIA();
 168                         } );
 169                 $sidebar.on( 'click.twentyfifteen keydown.twentyfifteen', 'button', resizeAndScroll );
 170
 171                 resizeAndScroll();
 172
 173                 for ( var i = 1; i < 6; i++ ) {
 174                         setTimeout( resizeAndScroll, 100 * i );
 175                 }
 176         } );
 177
 178 } )( jQuery );