136 lines
4.4 KiB
JavaScript
136 lines
4.4 KiB
JavaScript
/**
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* File navigation.js.
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*
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* Handles toggling the navigation menu for small screens and enables TAB key
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* navigation support for dropdown menus.
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*/
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( function( $ ) {
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var body, menuToggle, siteMenu, siteNavigation;
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function initMainNavigation( container ) {
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// Add dropdown toggle that displays child menu items.
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var dropdownToggle = $( '<button />', {
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'class': 'dropdown-toggle',
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'aria-expanded': false
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} ).append( $( '<span />', {
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'class': 'screen-reader-text',
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text: screenReaderText.expand
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} ) );
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container.find( '.menu-item-has-children > a' ).after( dropdownToggle );
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// Toggle buttons and submenu items with active children menu items.
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container.find( '.current-menu-ancestor > button' ).addClass( 'toggled-on' );
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container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
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// Add menu items with submenus to aria-haspopup="true".
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container.find( '.menu-item-has-children' ).attr( 'aria-haspopup', 'true' );
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container.find( '.dropdown-toggle' ).click( function( e ) {
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var _this = $( this ),
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screenReaderSpan = _this.find( '.screen-reader-text' );
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e.preventDefault();
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_this.toggleClass( 'toggled-on' );
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_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
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// jscs:disable
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_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
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// jscs:enable
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screenReaderSpan.text( screenReaderSpan.text() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
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} );
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}
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initMainNavigation( $( '#site-navigation' ) );
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siteMenu = $( '#menu-primary' );
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siteNavigation = $( '#site-navigation' );
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menuToggle = siteNavigation.find( '.menu-toggle' );
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// Enable menuToggle.
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( function() {
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// Return early if menuToggle is missing.
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if ( ! menuToggle.length ) {
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return;
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}
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// Add an initial values for the attribute.
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menuToggle.add( siteNavigation ).attr( 'aria-expanded', 'false' );
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menuToggle.on( 'click.apostrophe', function() {
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$( this ).add( siteMenu ).add( siteNavigation ).toggleClass( 'toggled-on' );
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// jscs:disable
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$( this ).add( siteMenu ).add( siteNavigation ).attr( 'aria-expanded', $( this ).add( siteNavigation ).attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
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// jscs:enable
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} );
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} )();
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// Fix sub-menus for touch devices and better focus for hidden submenu items for accessibility.
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( function() {
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if ( ! siteNavigation.length || ! siteNavigation.children().length ) {
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return;
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}
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// Toggle `focus` class to allow submenu access on tablets.
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function toggleFocusClassTouchScreen() {
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if ( window.innerWidth >= 840 ) {
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$( document.body ).on( 'touchstart.apostrophe', function( e ) {
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if ( ! $( e.target ).closest( '.main-navigation li' ).length ) {
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$( '.main-navigation li' ).removeClass( 'focus' );
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}
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} );
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siteNavigation.find( '.menu-item-has-children > a' ).on( 'touchstart.apostrophe', function( e ) {
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var el = $( this ).parent( 'li' );
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if ( ! el.hasClass( 'focus' ) ) {
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e.preventDefault();
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el.toggleClass( 'focus' );
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el.siblings( '.focus' ).removeClass( 'focus' );
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}
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} );
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} else {
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siteNavigation.find( '.menu-item-has-children > a' ).unbind( 'touchstart.apostrophe' );
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}
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}
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if ( 'ontouchstart' in window ) {
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$( window ).on( 'resize.apostrophe', toggleFocusClassTouchScreen );
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toggleFocusClassTouchScreen();
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}
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siteNavigation.find( 'a' ).on( 'focus.apostrophe blur.apostrophe', function() {
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$( this ).parents( '.menu-item' ).toggleClass( 'focus' );
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} );
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} )();
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// Add the default ARIA attributes for the menu toggle and the navigations.
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function onResizeARIA() {
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if ( window.innerWidth < 840 ) {
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if ( menuToggle.hasClass( 'toggled-on' ) ) {
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menuToggle.attr( 'aria-expanded', 'true' );
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siteMenu.attr( 'aria-expanded', 'true' );
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siteNavigation.attr( 'aria-expanded', 'true' );
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} else {
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menuToggle.attr( 'aria-expanded', 'false' );
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siteMenu.attr( 'aria-expanded', 'false' );
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siteNavigation.attr( 'aria-expanded', 'false' );
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}
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} else {
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menuToggle.removeAttr( 'aria-expanded' );
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siteMenu.removeAttr( 'aria-expanded' );
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siteNavigation.removeAttr( 'aria-expanded' );
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}
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}
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$( document ).ready( function() {
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body = $( document.body );
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$( window )
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.on( 'load.apostrophe', onResizeARIA )
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.on( 'resize.apostrophe', onResizeARIA );
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} );
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} )( jQuery );
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