1 /**

     2  * Handles toggling the navigation menu for small screens and

     3  * accessibility for submenu items.

     4  */

     5 ( function() {

     6 	var nav = document.getElementById( 'site-navigation' ), button, menu;

     7 	if ( ! nav ) {

     8 		return;

     9 	}

    10 

    11 	button = nav.getElementsByTagName( 'button' )[0];

    12 	menu   = nav.getElementsByTagName( 'ul' )[0];

    13 	if ( ! button ) {

    14 		return;

    15 	}

    16 

    17 	// Hide button if menu is missing or empty.

    18 	if ( ! menu || ! menu.childNodes.length ) {

    19 		button.style.display = 'none';

    20 		return;

    21 	}

    22 

    23 	button.onclick = function() {

    24 		if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {

    25 			menu.className = 'nav-menu';

    26 		}

    27 

    28 		if ( -1 !== button.className.indexOf( 'toggled-on' ) ) {

    29 			button.className = button.className.replace( ' toggled-on', '' );

    30 			menu.className = menu.className.replace( ' toggled-on', '' );

    31 		} else {

    32 			button.className += ' toggled-on';

    33 			menu.className += ' toggled-on';

    34 		}

    35 	};

    36 } )();

    37 

    38 // Better focus for hidden submenu items for accessibility.

    39 ( function( $ ) {

    40 	$( '.main-navigation' ).find( 'a' ).on( 'focus.twentytwelve blur.twentytwelve', function() {

    41 		$( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' );

    42 	} );

    43 

    44   if ( 'ontouchstart' in window ) {

    45     $('body').on( 'touchstart.twentytwelve',  '.menu-item-has-children > a, .page_item_has_children > a', function( e ) {

    46       var el = $( this ).parent( 'li' );

    47 

    48       if ( ! el.hasClass( 'focus' ) ) {

    49         e.preventDefault();

    50         el.toggleClass( 'focus' );

    51         el.siblings( '.focus').removeClass( 'focus' );

    52       }

    53     } );

    54   }

    55 } )( jQuery );