https://www.oxfamitalia.org/wp-content/themes/oxfam-new/assets/js/navigation.js

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
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		}
53	});
54
55	// Get all the link elements within the menu.
56	const links = menu.getElementsByTagName('a');
57
58	// Get all the link elements with children within the menu.
59	const linksWithChildren = menu.querySelectorAll('.menu-item-has-children > a, .page_item_has_children > a');
60
61	// Toggle focus each time a menu link is focused or blurred.
62	for (const link of links) {
63		link.addEventListener('focus', toggleFocus, true);
64		link.addEventListener('blur', toggleFocus, true);
65	}
66
67	// Toggle focus each time a menu link with children receive a touch event.
68	for (const link of linksWithChildren) {
69		link.addEventListener('touchstart', toggleFocus, false);
70	}
71
72	/**
73	 * Sets or removes .focus class on an element.
74	 */
75	function toggleFocus() {
76		if (event.type === 'focus' || event.type === 'blur') {
77			let self = this;
78			// Move up through the ancestors of the current link until we hit .nav-menu.
79			while (!self.classList.contains('nav-menu')) {
80				// On li elements toggle the class .focus.
81				if ('li' === self.tagName.toLowerCase()) {
82					self.classList.toggle('focus');
83				}
84				self = self.parentNode;
85			}
86		}
87
88		if (event.type === 'touchstart') {
89			const menuItem = this.parentNode;
90			event.preventDefault();
91			for (const link of menuItem.parentNode.children) {
92				if (menuItem !== link) {
93					link.classList.remove('focus');
94				}
95			}
96			menuItem.classList.toggle('focus');
97		}
98	}
99}());