https://www.ljustero.se/wp-content/themes/snapfolio/js/navigation.js?ver=1.0

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