2 * Handles toggling the navigation menu for small screens and
3 * accessibility for submenu items.
6 var nav = document.getElementById( 'site-navigation' ), button, menu;
11 button = nav.getElementsByTagName( 'h3' )[0];
12 menu = nav.getElementsByTagName( 'ul' )[0];
17 // Hide button if menu is missing or empty.
18 if ( ! menu || ! menu.childNodes.length ) {
19 button.style.display = 'none';
23 button.onclick = function() {
24 if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {
25 menu.className = 'nav-menu';
28 if ( -1 !== button.className.indexOf( 'toggled-on' ) ) {
29 button.className = button.className.replace( ' toggled-on', '' );
30 menu.className = menu.className.replace( ' toggled-on', '' );
32 button.className += ' toggled-on';
33 menu.className += ' toggled-on';
38 // Better focus for hidden submenu items for accessibility.
40 $( '.main-navigation' ).find( 'a' ).on( 'focus.twentytwelve blur.twentytwelve', function() {
41 $( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' );