https://www.continentalline.org/CL/wp-content/themes/scaffold/assets/js/navigation.js?ver=1.3.1

1/**
2 * Handles toggling the navigation menu for small screens and enables TAB key
3 * navigation support for dropdown menus.
4 *
5 * @package    scaffold
6 * @copyright  Copyright (c) 2020, Danny Cooper
7 * @license    http://opensource.org/licenses/gpl-2.0.php GNU Public License
8 */
9
10( function() {
11	var container, button, menu, links, i, len;
12
13	container = document.getElementById( 'site-navigation' );
14	if ( ! container ) {
15		return;
16	}
17
18	button = container.getElementsByTagName( 'button' )[0];
19	if ( 'undefined' === typeof button ) {
20		return;
21	}
22
23	menu = container.getElementsByTagName( 'ul' )[0];
24
25	// Hide menu toggle button if menu is empty and return early.
26	if ( 'undefined' === typeof menu ) {
27		button.style.display = 'none';
28		return;
29	}
30
31	menu.setAttribute( 'aria-expanded', 'false' );
32	if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {
33		menu.className += ' nav-menu';
34	}
35
36	button.onclick = function() {
37		if ( -1 !== container.className.indexOf( 'toggled' ) ) {
38			container.className = container.className.replace( ' toggled', '' );
39			button.setAttribute( 'aria-expanded', 'false' );
40			menu.setAttribute( 'aria-expanded', 'false' );
41		} else {
42			container.className += ' toggled';
43			button.setAttribute( 'aria-expanded', 'true' );
44			menu.setAttribute( 'aria-expanded', 'true' );
45		}
46	};
47
48	// Get all the link elements within the menu.
49	links    = menu.getElementsByTagName( 'a' );
50
51	// Each time a menu link is focused or blurred, toggle focus.
52	for ( i = 0, len = links.length; i < len; i++ ) {
53		links[i].addEventListener( 'focus', toggleFocus, true );
54		links[i].addEventListener( 'blur', toggleFocus, true );
55	}
56
57	/**
58	 * Sets or removes .focus class on an element.
59	 */
60	function toggleFocus() {
61		var self = this;
62
63		// Move up through the ancestors of the current link until we hit .nav-menu.
64		while ( -1 === self.className.indexOf( 'nav-menu' ) ) {
65
66			// On li elements toggle the class .focus.
67			if ( 'li' === self.tagName.toLowerCase() ) {
68				if ( -1 !== self.className.indexOf( 'focus' ) ) {
69					self.className = self.className.replace( ' focus', '' );
70				} else {
71					self.className += ' focus';
72				}
73			}
74
75			self = self.parentElement;
76		}
77	}
78
79	/**
80	 * Toggles `focus` class to allow submenu access on tablets.
81	 */
82	( function( container ) {
83		var touchStartFn, i,
84			parentLink = container.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
85
86		if ( 'ontouchstart' in window ) {
87			touchStartFn = function( e ) {
88				var menuItem = this.parentNode, i;
89
90				if ( ! menuItem.classList.contains( 'focus' ) ) {
91					e.preventDefault();
92					for ( var i = 0, len = menuItem.parentNode.children.length; i < len; ++i ) {
93						if ( menuItem === menuItem.parentNode.children[i] ) {
94							continue;
95						}
96						menuItem.parentNode.children[i].classList.remove( 'focus' );
97					}
98					menuItem.classList.add( 'focus' );
99				} else {
100					menuItem.classList.remove( 'focus' );
101				}
102			};
103
104			for ( var i = 0, len = parentLink.length; i < len; ++i ) {
105				parentLink[i].addEventListener( 'touchstart', touchStartFn, false );
106			}
107		}
108	}( container ) );
109} )();