https://laernorsknaa.com/wp-content/themes/twentyseventeen/assets/js/navigation.js?ver=20161203

1/* global twentyseventeenScreenReaderText */
2/**
3 * Theme functions file.
4 *
5 * Contains handlers for navigation and widget area.
6 */
7
8(function( $ ) {
9	var masthead, menuToggle, siteNavContain, siteNavigation;
10
11	function initMainNavigation( container ) {
12
13		// Add dropdown toggle that displays child menu items.
14		var dropdownToggle = $( '<button />', { 'class': 'dropdown-toggle', 'aria-expanded': false })
15			.append( twentyseventeenScreenReaderText.icon )
16			.append( $( '<span />', { 'class': 'screen-reader-text', text: twentyseventeenScreenReaderText.expand }) );
17
18		container.find( '.menu-item-has-children > a, .page_item_has_children > a' ).after( dropdownToggle );
19
20		// Set the active submenu dropdown toggle button initial state.
21		container.find( '.current-menu-ancestor > button' )
22			.addClass( 'toggled-on' )
23			.attr( 'aria-expanded', 'true' )
24			.find( '.screen-reader-text' )
25			.text( twentyseventeenScreenReaderText.collapse );
26		// Set the active submenu initial state.
27		container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
28
29		container.find( '.dropdown-toggle' ).on( 'click', function( e ) {
30			var _this = $( this ),
31				screenReaderSpan = _this.find( '.screen-reader-text' );
32
33			e.preventDefault();
34			_this.toggleClass( 'toggled-on' );
35			_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
36
37			_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
38
39			screenReaderSpan.text( screenReaderSpan.text() === twentyseventeenScreenReaderText.expand ? twentyseventeenScreenReaderText.collapse : twentyseventeenScreenReaderText.expand );
40		});
41	}
42
43	initMainNavigation( $( '.main-navigation' ) );
44
45	masthead       = $( '#masthead' );
46	menuToggle     = masthead.find( '.menu-toggle' );
47	siteNavContain = masthead.find( '.main-navigation' );
48	siteNavigation = masthead.find( '.main-navigation > div > ul' );
49
50	// Enable menuToggle.
51	(function() {
52
53		// Return early if menuToggle is missing.
54		if ( ! menuToggle.length ) {
55			return;
56		}
57
58		// Add an initial value for the attribute.
59		menuToggle.attr( 'aria-expanded', 'false' );
60
61		menuToggle.on( 'click.twentyseventeen', function() {
62			siteNavContain.toggleClass( 'toggled-on' );
63
64			$( this ).attr( 'aria-expanded', siteNavContain.hasClass( 'toggled-on' ) );
65		});
66	})();
67
68	// Fix sub-menus for touch devices and better focus for hidden submenu items for accessibility.
69	(function() {
70		if ( ! siteNavigation.length || ! siteNavigation.children().length ) {
71			return;
72		}
73
74		// Toggle `focus` class to allow submenu access on tablets.
75		function toggleFocusClassTouchScreen() {
76			if ( 'none' === $( '.menu-toggle' ).css( 'display' ) ) {
77
78				$( document.body ).on( 'touchstart.twentyseventeen', function( e ) {
79					if ( ! $( e.target ).closest( '.main-navigation li' ).length ) {
80						$( '.main-navigation li' ).removeClass( 'focus' );
81					}
82				});
83
84				siteNavigation.find( '.menu-item-has-children > a, .page_item_has_children > a' )
85					.on( 'touchstart.twentyseventeen', function( e ) {
86						var el = $( this ).parent( 'li' );
87
88						if ( ! el.hasClass( 'focus' ) ) {
89							e.preventDefault();
90							el.toggleClass( 'focus' );
91							el.siblings( '.focus' ).removeClass( 'focus' );
92						}
93					});
94
95			} else {
96				siteNavigation.find( '.menu-item-has-children > a, .page_item_has_children > a' ).unbind( 'touchstart.twentyseventeen' );
97			}
98		}
99
100		if ( 'ontouchstart' in window ) {
101			$( window ).on( 'resize.twentyseventeen', toggleFocusClassTouchScreen );
102			toggleFocusClassTouchScreen();
103		}
104
105		siteNavigation.find( 'a' ).on( 'focus.twentyseventeen blur.twentyseventeen', function() {
106			$( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' );
107		});
108	})();
109})( jQuery );