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

   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         /**
  29          * Enables menu toggle for small screens.
  30          */
  31         ( function() {
  32                 var nav = $( '#site-navigation' ), button, menu;
  33                 if ( ! nav ) {
  34                         return;
  35                 }
  36
  37                 button = nav.find( '.menu-toggle' );
  38                 if ( ! button ) {
  39                         return;
  40                 }
  41
  42                 // Hide button if menu is missing or empty.
  43                 menu = nav.find( '.nav-menu' );
  44                 if ( ! menu || ! menu.children().length ) {
  45                         button.hide();
  46                         return;
  47                 }
  48
  49                 button.on( 'click.twentythirteen', function() {
  50                         nav.toggleClass( 'toggled-on' );
  51                 } );
  52
  53                 // Better focus for hidden submenu items for accessibility.
  54                 menu.find( 'a' ).on( 'focus.twentythirteen blur.twentythirteen', function() {
  55                         $( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' );
  56                 } );
  57         } )();
  58
  59         /**
  60          * Makes "skip to content" link work correctly in IE9 and Chrome for better
  61          * accessibility.
  62          *
  63          * @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
  64          */
  65         _window.on( 'hashchange.twentythirteen', function() {
  66                 var element = document.getElementById( location.hash.substring( 1 ) );
  67
  68                 if ( element ) {
  69                         if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) {
  70                                 element.tabIndex = -1;
  71                         }
  72
  73                         element.focus();
  74                 }
  75         } );
  76
  77         /**
  78          * Arranges footer widgets vertically.
  79          */
  80         if ( $.isFunction( $.fn.masonry ) ) {
  81                 var columnWidth = body.is( '.sidebar' ) ? 228 : 245;
  82
  83                 $( '#secondary .widget-area' ).masonry( {
  84                         itemSelector: '.widget',
  85                         columnWidth: columnWidth,
  86                         gutterWidth: 20,
  87                         isRTL: body.is( '.rtl' )
  88                 } );
  89         }
  90 } )( jQuery );