WordPress/wp-content/themes/twentytwelve/js/navigation.js

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JavaScript
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/**
* Handles toggling the navigation menu for small screens and
* accessibility for submenu items.
*/
( function() {
var nav = document.getElementById( 'site-navigation' ), button, menu;
if ( ! nav ) {
return;
}
button = nav.getElementsByTagName( 'h3' )[0];
menu = nav.getElementsByTagName( 'ul' )[0];
if ( ! button ) {
return;
}
// Hide button if menu is missing or empty.
if ( ! menu || ! menu.childNodes.length ) {
button.style.display = 'none';
return;
}
button.onclick = function() {
if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {
menu.className = 'nav-menu';
}
if ( -1 !== button.className.indexOf( 'toggled-on' ) ) {
button.className = button.className.replace( ' toggled-on', '' );
menu.className = menu.className.replace( ' toggled-on', '' );
} else {
button.className += ' toggled-on';
menu.className += ' toggled-on';
}
};
} )();
// Better focus for hidden submenu items for accessibility.
( function( $ ) {
$( '.main-navigation' ).find( 'a' ).on( 'focus.twentytwelve blur.twentytwelve', function() {
$( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' );
} );
} )( jQuery );