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/** |
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* Functionality specific to Twenty Thirteen. |
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* |
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* Provides helper functions to enhance the theme experience. |
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*/ |
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( function( $ ) { |
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var body = $( 'body' ), |
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_window = $( window ), |
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nav, button, menu; |
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nav = $( '#site-navigation' ); |
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button = nav.find( '.menu-toggle' ); |
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menu = nav.find( '.nav-menu' ); |
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/** |
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* Adds a top margin to the footer if the sidebar widget area is higher |
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* than the rest of the page, to help the footer always visually clear |
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* the sidebar. |
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*/ |
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$( function() { |
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if ( body.is( '.sidebar' ) ) { |
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var sidebar = $( '#secondary .widget-area' ), |
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secondary = ( 0 === sidebar.length ) ? -40 : sidebar.height(), |
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margin = $( '#tertiary .widget-area' ).height() - $( '#content' ).height() - secondary; |
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if ( margin > 0 && _window.innerWidth() > 999 ) { |
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$( '#colophon' ).css( 'margin-top', margin + 'px' ); |
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} |
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} |
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} ); |
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/** |
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* Enables menu toggle for small screens. |
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*/ |
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( function() { |
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if ( ! nav || ! button ) { |
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return; |
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} |
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// Hide button if menu is missing or empty. |
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if ( ! menu || ! menu.children().length ) { |
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button.hide(); |
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return; |
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} |
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button.on( 'click.twentythirteen', function() { |
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nav.toggleClass( 'toggled-on' ); |
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if ( nav.hasClass( 'toggled-on' ) ) { |
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$( this ).attr( 'aria-expanded', 'true' ); |
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menu.attr( 'aria-expanded', 'true' ); |
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} else { |
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$( this ).attr( 'aria-expanded', 'false' ); |
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menu.attr( 'aria-expanded', 'false' ); |
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} |
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} ); |
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// Fix sub-menus for touch devices. |
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if ( 'ontouchstart' in window ) { |
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menu.find( '.menu-item-has-children > a, .page_item_has_children > a' ).on( 'touchstart.twentythirteen', function( e ) { |
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var el = $( this ).parent( 'li' ); |
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if ( ! el.hasClass( 'focus' ) ) { |
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e.preventDefault(); |
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el.toggleClass( 'focus' ); |
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el.siblings( '.focus' ).removeClass( 'focus' ); |
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} |
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} ); |
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} |
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// Better focus for hidden submenu items for accessibility. |
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menu.find( 'a' ).on( 'focus.twentythirteen blur.twentythirteen', function() { |
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$( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' ); |
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} ); |
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} )(); |
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/** |
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* @summary Add or remove ARIA attributes. |
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* Uses jQuery's width() function to determine the size of the window and add |
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* the default ARIA attributes for the menu toggle if it's visible. |
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* @since Twenty Thirteen 1.5 |
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*/ |
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function onResizeARIA() { |
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if ( 643 > _window.width() ) { |
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button.attr( 'aria-expanded', 'false' ); |
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menu.attr( 'aria-expanded', 'false' ); |
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button.attr( 'aria-controls', 'primary-menu' ); |
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} else { |
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button.removeAttr( 'aria-expanded' ); |
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menu.removeAttr( 'aria-expanded' ); |
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button.removeAttr( 'aria-controls' ); |
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} |
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} |
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_window |
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.on( 'load.twentythirteen', onResizeARIA ) |
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.on( 'resize.twentythirteen', function() { |
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onResizeARIA(); |
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} ); |
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/** |
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* Makes "skip to content" link work correctly in IE9 and Chrome for better |
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* accessibility. |
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* |
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* @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/ |
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*/ |
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_window.on( 'hashchange.twentythirteen', function() { |
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var element = document.getElementById( location.hash.substring( 1 ) ); |
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if ( element ) { |
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if ( ! /^(?:a|select|input|button|textarea)$/i.test( element.tagName ) ) { |
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element.tabIndex = -1; |
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} |
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element.focus(); |
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} |
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} ); |
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/** |
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* Arranges footer widgets vertically. |
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*/ |
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if ( $.isFunction( $.fn.masonry ) ) { |
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var columnWidth = body.is( '.sidebar' ) ? 228 : 245; |
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$( '#secondary .widget-area' ).masonry( { |
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itemSelector: '.widget', |
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columnWidth: columnWidth, |
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gutterWidth: 20, |
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isRTL: body.is( '.rtl' ) |
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} ); |
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} |
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} )( jQuery ); |