themes-wordpress/apostrophe-2/js/navigation.js

/**
 * File navigation.js.
 *
 * Handles toggling the navigation menu for small screens and enables TAB key
 * navigation support for dropdown menus.
 */
( function( $ ) {

	var body, menuToggle, siteMenu, siteNavigation;

	function initMainNavigation( container ) {

		// Add dropdown toggle that displays child menu items.
		var dropdownToggle = $( '<button />', {
			'class': 'dropdown-toggle',
			'aria-expanded': false
		} ).append( $( '<span />', {
			'class': 'screen-reader-text',
			text: screenReaderText.expand
		} ) );

		container.find( '.menu-item-has-children > a' ).after( dropdownToggle );

		// Toggle buttons and submenu items with active children menu items.
		container.find( '.current-menu-ancestor > button' ).addClass( 'toggled-on' );
		container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );

		// Add menu items with submenus to aria-haspopup="true".
		container.find( '.menu-item-has-children' ).attr( 'aria-haspopup', 'true' );

		container.find( '.dropdown-toggle' ).click( function( e ) {
			var _this            = $( this ),
				screenReaderSpan = _this.find( '.screen-reader-text' );

			e.preventDefault();
			_this.toggleClass( 'toggled-on' );
			_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );

			// jscs:disable
			_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
			// jscs:enable
			screenReaderSpan.text( screenReaderSpan.text() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
		} );
	}
	initMainNavigation( $( '#site-navigation' ) );

	siteMenu         = $( '#menu-primary' );
	siteNavigation   = $( '#site-navigation' );
	menuToggle       = siteNavigation.find( '.menu-toggle' );

	// Enable menuToggle.
	( function() {

		// Return early if menuToggle is missing.
		if ( ! menuToggle.length ) {
			return;
		}

		// Add an initial values for the attribute.
		menuToggle.add( siteNavigation ).attr( 'aria-expanded', 'false' );

		menuToggle.on( 'click.apostrophe', function() {
			$( this ).add( siteMenu ).add( siteNavigation ).toggleClass( 'toggled-on' );

			// jscs:disable
			$( this ).add( siteMenu ).add( siteNavigation ).attr( 'aria-expanded', $( this ).add( siteNavigation ).attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
			// jscs:enable
		} );
	} )();

	// Fix sub-menus for touch devices and better focus for hidden submenu items for accessibility.
	( function() {
		if ( ! siteNavigation.length || ! siteNavigation.children().length ) {
			return;
		}

		// Toggle `focus` class to allow submenu access on tablets.
		function toggleFocusClassTouchScreen() {
			if ( window.innerWidth >= 840 ) {
				$( document.body ).on( 'touchstart.apostrophe', function( e ) {
					if ( ! $( e.target ).closest( '.main-navigation li' ).length ) {
						$( '.main-navigation li' ).removeClass( 'focus' );
					}
				} );
				siteNavigation.find( '.menu-item-has-children > a' ).on( 'touchstart.apostrophe', function( e ) {
					var el = $( this ).parent( 'li' );

					if ( ! el.hasClass( 'focus' ) ) {
						e.preventDefault();
						el.toggleClass( 'focus' );
						el.siblings( '.focus' ).removeClass( 'focus' );
					}
				} );
			} else {
				siteNavigation.find( '.menu-item-has-children > a' ).unbind( 'touchstart.apostrophe' );
			}
		}

		if ( 'ontouchstart' in window ) {
			$( window ).on( 'resize.apostrophe', toggleFocusClassTouchScreen );
			toggleFocusClassTouchScreen();
		}

		siteNavigation.find( 'a' ).on( 'focus.apostrophe blur.apostrophe', function() {
			$( this ).parents( '.menu-item' ).toggleClass( 'focus' );
		} );
	} )();

	// Add the default ARIA attributes for the menu toggle and the navigations.
	function onResizeARIA() {
		if ( window.innerWidth < 840 ) {
			if ( menuToggle.hasClass( 'toggled-on' ) ) {
				menuToggle.attr( 'aria-expanded', 'true' );
				siteMenu.attr( 'aria-expanded', 'true' );
				siteNavigation.attr( 'aria-expanded', 'true' );
			} else {
				menuToggle.attr( 'aria-expanded', 'false' );
				siteMenu.attr( 'aria-expanded', 'false' );
				siteNavigation.attr( 'aria-expanded', 'false' );
			}
		} else {
			menuToggle.removeAttr( 'aria-expanded' );
			siteMenu.removeAttr( 'aria-expanded' );
			siteNavigation.removeAttr( 'aria-expanded' );
		}
	}

	$( document ).ready( function() {
		body = $( document.body );

		$( window )
			.on( 'load.apostrophe', onResizeARIA )
			.on( 'resize.apostrophe', onResizeARIA );
	} );

} )( jQuery );