/** * File navigation.js. * * Handles toggling the navigation menu for small screens and enables TAB key * navigation support for dropdown menus. */ ( function() { const siteNavigation = document.getElementById( 'site-navigation' ); // Return early if the navigation doesn't exist. if ( ! siteNavigation ) { return; } const button = siteNavigation.getElementsByTagName( 'button' )[ 0 ]; // Return early if the button doesn't exist. if ( 'undefined' === typeof button ) { return; } const menu = siteNavigation.getElementsByTagName( 'ul' )[ 0 ]; // Hide menu toggle button if menu is empty and return early. if ( 'undefined' === typeof menu ) { button.style.display = 'none'; return; } if ( ! menu.classList.contains( 'nav-menu' ) ) { menu.classList.add( 'nav-menu' ); } // Toggle the .toggled class and the aria-expanded value each time the button is clicked. button.addEventListener( 'click', function() { siteNavigation.classList.toggle( 'toggled' ); if ( button.getAttribute( 'aria-expanded' ) === 'true' ) { button.setAttribute( 'aria-expanded', 'false' ); } else { button.setAttribute( 'aria-expanded', 'true' ); } } ); // Remove the .toggled class and set aria-expanded to false when the user clicks outside the navigation. document.addEventListener( 'click', function( event ) { const isClickInside = siteNavigation.contains( event.target ); if ( ! isClickInside ) { siteNavigation.classList.remove( 'toggled' ); button.setAttribute( 'aria-expanded', 'false' ); } } ); // Get all the link elements within the menu. const links = menu.getElementsByTagName( 'a' ); // Get all the link elements with children within the menu. const linksWithChildren = menu.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' ); // Toggle focus each time a menu link is focused or blurred. for ( const link of links ) { link.addEventListener( 'focus', toggleFocus, true ); link.addEventListener( 'blur', toggleFocus, true ); } // Toggle focus each time a menu link with children receive a touch event. for ( const link of linksWithChildren ) { link.addEventListener( 'touchstart', toggleFocus, false ); } /** * Sets or removes .focus class on an element. */ function toggleFocus() { if ( event.type === 'focus' || event.type === 'blur' ) { let self = this; // Move up through the ancestors of the current link until we hit .nav-menu. while ( ! self.classList.contains( 'nav-menu' ) ) { // On li elements toggle the class .focus. if ( 'li' === self.tagName.toLowerCase() ) { self.classList.toggle( 'focus' ); } self = self.parentNode; } } if ( event.type === 'touchstart' ) { const menuItem = this.parentNode; event.preventDefault(); for ( const link of menuItem.parentNode.children ) { if ( menuItem !== link ) { link.classList.remove( 'focus' ); } } menuItem.classList.toggle( 'focus' ); } } }() );