https://kaysyrad.co.uk/wp-content/themes/escutcheon/assets/js/navigation.js?ver=20120206

1/**
2 * navigation.js
3 *
4 * Handles toggling the navigation menu for small screens and enables tab
5 * support for dropdown menus.
6 */
7( function() {
8	var container, button, menu, links, subMenus;
9
10	container = document.getElementById( 'site-navigation' );
11	if ( ! container ) {
12		return;
13	}
14
15	button = container.getElementsByTagName( 'button' )[0];
16	if ( 'undefined' === typeof button ) {
17		return;
18	}
19
20	menu = container.getElementsByTagName( 'ul' )[0];
21
22	// Hide menu toggle button if menu is empty and return early.
23	if ( 'undefined' === typeof menu ) {
24		button.style.display = 'none';
25		return;
26	}
27
28	menu.setAttribute( 'aria-expanded', 'false' );
29	if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {
30		menu.className += ' nav-menu';
31	}
32
33	button.onclick = function() {
34		if ( -1 !== container.className.indexOf( 'toggled' ) ) {
35			container.className = container.className.replace( ' toggled', '' );
36			button.setAttribute( 'aria-expanded', 'false' );
37			menu.setAttribute( 'aria-expanded', 'false' );
38		} else {
39			container.className += ' toggled';
40			button.setAttribute( 'aria-expanded', 'true' );
41			menu.setAttribute( 'aria-expanded', 'true' );
42		}
43	};
44
45	// Get all the link elements within the menu.
46	links    = menu.getElementsByTagName( 'a' );
47	subMenus = menu.getElementsByTagName( 'ul' );
48
49	// Set menu items with submenus to aria-haspopup="true".
50	for ( var i = 0, len = subMenus.length; i < len; i++ ) {
51		subMenus[i].parentNode.setAttribute( 'aria-haspopup', 'true' );
52	}
53
54	// Each time a menu link is focused or blurred, toggle focus.
55	for ( i = 0, len = links.length; i < len; i++ ) {
56		links[i].addEventListener( 'focus', toggleFocus, true );
57		links[i].addEventListener( 'blur', toggleFocus, true );
58	}
59
60	// Fix child menus for touch devices.
61	function fixMenuTouchTaps( container ) {
62		var touchStartFn,
63		    parentLink = container.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
64
65		if ( 'ontouchstart' in window ) {
66			touchStartFn = function( e ) {
67				var menuItem = this.parentNode;
68
69				if ( ! menuItem.classList.contains( 'focus' ) ) {
70					e.preventDefault();
71					for( var i = 0; i < menuItem.parentNode.children.length; ++i ) {
72						if ( menuItem === menuItem.parentNode.children[i] ) {
73							continue;
74						}
75						menuItem.parentNode.children[i].classList.remove( 'focus' );
76					}
77					menuItem.classList.add( 'focus' );
78				} else {
79					menuItem.classList.remove( 'focus' );
80				}
81			};
82
83			for ( var i = 0; i < parentLink.length; ++i ) {
84				parentLink[i].addEventListener( 'touchstart', touchStartFn, false )
85			}
86		}
87	}
88
89	fixMenuTouchTaps( container );
90
91	/**
92	 * Sets or removes .focus class on an element.
93	 */
94	function toggleFocus() {
95		var self = this;
96
97		// Move up through the ancestors of the current link until we hit .nav-menu.
98		while ( -1 === self.className.indexOf( 'nav-menu' ) ) {
99
100			// On li elements toggle the class .focus.
101			if ( 'li' === self.tagName.toLowerCase() ) {
102				if ( -1 !== self.className.indexOf( 'focus' ) ) {
103					self.className = self.className.replace( ' focus', '' );
104				} else {
105					self.className += ' focus';
106				}
107			}
108
109			self = self.parentElement;
110		}
111	}
112} )();