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