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   1  /**
   2   * Functionality specific to Twenty Thirteen.
   3   *
   4   * Provides helper functions to enhance the theme experience.
   5   */
   6  
   7  ( function( $ ) {
   8      var body    = $( 'body' ),
   9          _window = $( window );
  10  
  11      /**
  12       * Adds a top margin to the footer if the sidebar widget area is higher
  13       * than the rest of the page, to help the footer always visually clear
  14       * the sidebar.
  15       */
  16      $( function() {
  17          if ( body.is( '.sidebar' ) ) {
  18              var sidebar   = $( '#secondary .widget-area' ),
  19                  secondary = ( 0 == sidebar.length ) ? -40 : sidebar.height(),
  20                  margin    = $( '#tertiary .widget-area' ).height() - $( '#content' ).height() - secondary;
  21  
  22              if ( margin > 0 && _window.innerWidth() > 999 )
  23                  $( '#colophon' ).css( 'margin-top', margin + 'px' );
  24          }
  25      } );
  26  
  27      /**
  28       * Enables menu toggle for small screens.
  29       */
  30      ( function() {
  31          var nav = $( '#site-navigation' ), button, menu;
  32          if ( ! nav )
  33              return;
  34  
  35          button = nav.find( '.menu-toggle' );
  36          if ( ! button )
  37              return;
  38  
  39          // Hide button if menu is missing or empty.
  40          menu = nav.find( '.nav-menu' );
  41          if ( ! menu || ! menu.children().length ) {
  42              button.hide();
  43              return;
  44          }
  45  
  46          $( '.menu-toggle' ).on( 'click.twentythirteen', function() {
  47              nav.toggleClass( 'toggled-on' );
  48          } );
  49      } )();
  50  
  51      /**
  52       * Makes "skip to content" link work correctly in IE9 and Chrome for better
  53       * accessibility.
  54       *
  55       * @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
  56       */
  57      _window.on( 'hashchange.twentythirteen', function() {
  58          var element = document.getElementById( location.hash.substring( 1 ) );
  59  
  60          if ( element ) {
  61              if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) )
  62                  element.tabIndex = -1;
  63  
  64              element.focus();
  65          }
  66      } );
  67  
  68      /**
  69       * Arranges footer widgets vertically.
  70       */
  71      if ( $.isFunction( $.fn.masonry ) ) {
  72          var columnWidth = body.is( '.sidebar' ) ? 228 : 245;
  73  
  74          $( '#secondary .widget-area' ).masonry( {
  75              itemSelector: '.widget',
  76              columnWidth: columnWidth,
  77              gutterWidth: 20,
  78              isRTL: body.is( '.rtl' )
  79          } );
  80      }
  81  } )( jQuery );