https://janeswalk.org/wp-content/themes/janes-walk/js/navigation.js?ver=1.0.6

1/**
2 * File navigation.js.
3 *
4 * Handles toggling the navigation menu for small screens and enables TAB key
5 * navigation support for dropdown menus.
6 */
7( function() {
8	const siteNavigation = document.getElementById( 'site-navigation' );
9
10	// Return early if the navigation doesn't exist.
11	if ( ! siteNavigation ) {
12		return;
13	}
14
15	const burgerButton = siteNavigation.getElementsByClassName( 'menu-toggle' )[ 0 ];
16	const closeButton = siteNavigation.getElementsByClassName( 'menu-toggle' )[ 1 ];
17
18	// Return early if the button doesn't exist.
19	if ( 'undefined' === typeof burgerButton ) {
20		return;
21	}
22
23	const menu = siteNavigation.getElementsByClassName('primary-menu')[0];
24
25	// // Hide menu toggle button if menu is empty and return early.
26	// if ( 'undefined' === typeof menu ) {
27	// 	burgerButton.style.display = 'none';
28	// 	return;
29	// }
30
31	if ( ! menu.classList.contains( 'nav-menu' ) ) {
32		menu.classList.add( 'nav-menu' );
33	}
34
35	// Toggle the .toggled class and the aria-expanded value each time the button is clicked.
36	burgerButton.addEventListener( 'click', function() {
37		siteNavigation.classList.toggle( 'toggled' );
38
39		if ( burgerButton.getAttribute( 'aria-expanded' ) === 'true') {
40			burgerButton.setAttribute( 'aria-expanded', 'false' );
41		} else {
42			burgerButton.setAttribute( 'aria-expanded', 'true' );
43		}
44	} );
45
46	closeButton.addEventListener( 'click', function( event ) {
47		siteNavigation.classList.remove( 'toggled' );
48		burgerButton.setAttribute( 'aria-expanded', 'false' );
49		window.scrollTo(0,0);
50	} );
51
52	
53	// Remove the .toggled class and set aria-expanded to false when the user clicks outside the navigation.
54	// Unlikely this will happen because it's a full screen menu
55	document.addEventListener( 'click', function( event ) {
56		const isClickInside = siteNavigation.contains( event.target );
57
58		if ( ! isClickInside ) {
59			siteNavigation.classList.remove( 'toggled' );
60			burgerButton.setAttribute( 'aria-expanded', 'false' );
61		}
62	} );
63
64	//------------ Accessibility below ---------//
65
66	// Get all the link elements within the menu.
67	const links = menu.getElementsByTagName( 'a' );
68
69	// Get all the link elements with children within the menu.
70	const linksWithChildren = menu.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
71
72	// Toggle focus each time a menu link is focused or blurred.
73	for ( const link of links ) {
74		link.addEventListener( 'focus', toggleFocus, true );
75		link.addEventListener( 'blur', toggleFocus, true );
76	}
77
78	// Toggle focus each time a menu link with children receive a touch event.
79	for ( const link of linksWithChildren ) {
80		link.addEventListener( 'touchstart', toggleFocus, false );
81	}
82
83	/**
84	 * Sets or removes .focus class on an element.
85	 */
86	function toggleFocus() {
87		if ( event.type === 'focus' || event.type === 'blur' ) {
88			let self = this;
89			// Move up through the ancestors of the current link until we hit .nav-menu.
90			while ( ! self.classList.contains( 'nav-menu' ) ) {
91				// On li elements toggle the class .focus.
92				if ( 'li' === self.tagName.toLowerCase() ) {
93					self.classList.toggle( 'focus' );
94				}
95				self = self.parentNode;
96			}
97		}
98
99		if ( event.type === 'touchstart' ) {
100			const menuItem = this.parentNode;
101			event.preventDefault();
102			for ( const link of menuItem.parentNode.children ) {
103				if ( menuItem !== link ) {
104					link.classList.remove( 'focus' );
105				}
106			}
107			menuItem.classList.toggle( 'focus' );
108		}
109	}
110}() );