https://www.tokyoheadline.com/wp-content/themes/tokyoheadlinecom/js/initial-navigation.js?ver=20151215

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	var container, button, menu, links, i, len;
9
10	container = document.getElementById( 'initial-site-navigation' );
11	if ( ! container ) {
12		return;
13	}
14
15		button =  document.getElementById("initial-btnToggle");
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			button.className = button.className.replace( 'toggled-buttton', '' );
36			container.className = container.className.replace( ' toggled', '' );
37			button.setAttribute( 'aria-expanded', 'false' );
38			menu.setAttribute( 'aria-expanded', 'false' );
39		} else {
40			button.className += ' toggled-buttton';
41			container.className += ' toggled';
42			button.setAttribute( 'aria-expanded', 'true' );
43			menu.setAttribute( 'aria-expanded', 'true' );
44		}
45	};
46
47	// Get all the link elements within the menu.
48	links    = menu.getElementsByTagName( 'a' );
49
50	// Each time a menu link is focused or blurred, toggle focus.
51	for ( i = 0, len = links.length; i < len; i++ ) {
52		links[i].addEventListener( 'focus', toggleFocus, true );
53		links[i].addEventListener( 'blur', toggleFocus, true );
54	}
55
56	/**
57	 * Sets or removes .focus class on an element.
58	 */
59	function toggleFocus() {
60		var self = this;
61
62		// Move up through the ancestors of the current link until we hit .nav-menu.
63		while ( -1 === self.className.indexOf( 'nav-menu' ) ) {
64
65			// On li elements toggle the class .focus.
66			if ( 'li' === self.tagName.toLowerCase() ) {
67				if ( -1 !== self.className.indexOf( 'focus' ) ) {
68					self.className = self.className.replace( ' focus', '' );
69				} else {
70					self.className += ' focus';
71				}
72			}
73
74			self = self.parentElement;
75		}
76	}
77
78	/**
79	 * Toggles `focus` class to allow submenu access on tablets.
80	 */
81	( function( container ) {
82		var touchStartFn, i,
83			parentLink = container.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
84
85		if ( 'ontouchstart' in window ) {
86			touchStartFn = function( e ) {
87				var menuItem = this.parentNode, i;
88
89				if ( ! menuItem.classList.contains( 'focus' ) ) {
90					e.preventDefault();
91					for ( i = 0; i < menuItem.parentNode.children.length; ++i ) {
92						if ( menuItem === menuItem.parentNode.children[i] ) {
93							continue;
94						}
95						menuItem.parentNode.children[i].classList.remove( 'focus' );
96					}
97					menuItem.classList.add( 'focus' );
98				} else {
99					menuItem.classList.remove( 'focus' );
100				}
101			};
102
103			for ( i = 0; i < parentLink.length; ++i ) {
104				parentLink[i].addEventListener( 'touchstart', touchStartFn, false );
105			}
106		}
107	}( container ) );
108} )();