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/** * File primary-navigation.js. * * Required to open and close the mobile navigation. */ /** * Toggle an attribute's value * * @since Twenty Twenty-One 1.0 * * @param {Element} el - The element. * @param {boolean} withListeners - Whether we want to add/remove listeners or not. */ function twentytwentyoneToggleAriaExpanded( el, withListeners ) { if ( 'true' !== el.getAttribute( 'aria-expanded' ) ) { el.setAttribute( 'aria-expanded', 'true' ); twentytwentyoneSubmenuPosition( el.parentElement ); if ( withListeners ) { document.addEventListener( 'click', twentytwentyoneCollapseMenuOnClickOutside ); } } else { el.setAttribute( 'aria-expanded', 'false' ); if ( withListeners ) { document.removeEventListener( 'click', twentytwentyoneCollapseMenuOnClickOutside ); } } } function twentytwentyoneCollapseMenuOnClickOutside( event ) { if ( ! document.getElementById( 'site-navigation' ).contains( event.target ) ) { document.getElementById( 'site-navigation' ).querySelectorAll( '.sub-menu-toggle' ).forEach( function( button ) { button.setAttribute( 'aria-expanded', 'false' ); } ); } } /** * Changes the position of submenus so they always fit the screen horizontally. * * @since Twenty Twenty-One 1.0 * * @param {Element} li - The li element. */ function twentytwentyoneSubmenuPosition( li ) { var subMenu = li.querySelector( 'ul.sub-menu' ), rect, right, left, windowWidth; if ( ! subMenu ) { return; } rect = subMenu.getBoundingClientRect(); right = Math.round( rect.right ); left = Math.round( rect.left ); windowWidth = Math.round( window.innerWidth ); if ( right > windowWidth ) { subMenu.classList.add( 'submenu-reposition-right' ); } else if ( document.body.classList.contains( 'rtl' ) && left < 0 ) { subMenu.classList.add( 'submenu-reposition-left' ); } } /** * Handle clicks on submenu toggles. * * @since Twenty Twenty-One 1.0 * * @param {Element} el - The element. */ function twentytwentyoneExpandSubMenu( el ) { // jshint ignore:line // Close other expanded items. el.closest( 'nav' ).querySelectorAll( '.sub-menu-toggle' ).forEach( function( button ) { if ( button !== el ) { button.setAttribute( 'aria-expanded', 'false' ); } } ); // Toggle aria-expanded on the button. twentytwentyoneToggleAriaExpanded( el, true ); // On tab-away collapse the menu. el.parentNode.querySelectorAll( 'ul > li:last-child > a' ).forEach( function( linkEl ) { linkEl.addEventListener( 'blur', function( event ) { if ( ! el.parentNode.contains( event.relatedTarget ) ) { el.setAttribute( 'aria-expanded', 'false' ); } } ); } ); } ( function() { /** * Menu Toggle Behaviors * * @since Twenty Twenty-One 1.0 * * @param {string} id - The ID. */ var navMenu = function( id ) { var wrapper = document.body, // this is the element to which a CSS class is added when a mobile nav menu is open mobileButton = document.getElementById( id + '-mobile-menu' ), navMenuEl = document.getElementById( 'site-navigation' ); // If there's no nav menu, none of this is necessary. if ( ! navMenuEl ) { return; } if ( mobileButton ) { mobileButton.onclick = function() { wrapper.classList.toggle( id + '-navigation-open' ); wrapper.classList.toggle( 'lock-scrolling' ); twentytwentyoneToggleAriaExpanded( mobileButton ); mobileButton.focus(); }; } /** * Trap keyboard navigation in the menu modal. * Adapted from Twenty Twenty. * * @since Twenty Twenty-One 1.0 */ document.addEventListener( 'keydown', function( event ) { var modal, elements, selectors, lastEl, firstEl, activeEl, tabKey, shiftKey, escKey; if ( ! wrapper.classList.contains( id + '-navigation-open' ) ) { return; } modal = document.querySelector( '.' + id + '-navigation' ); selectors = 'input, a, button'; elements = modal.querySelectorAll( selectors ); elements = Array.prototype.slice.call( elements ); tabKey = event.keyCode === 9; shiftKey = event.shiftKey; escKey = event.keyCode === 27; activeEl = document.activeElement; // eslint-disable-line @wordpress/no-global-active-element lastEl = elements[ elements.length - 1 ]; firstEl = elements[0]; if ( escKey ) { event.preventDefault(); wrapper.classList.remove( id + '-navigation-open', 'lock-scrolling' ); twentytwentyoneToggleAriaExpanded( mobileButton ); mobileButton.focus(); } if ( ! shiftKey && tabKey && lastEl === activeEl ) { event.preventDefault(); firstEl.focus(); } if ( shiftKey && tabKey && firstEl === activeEl ) { event.preventDefault(); lastEl.focus(); } // If there are no elements in the menu, don't move the focus if ( tabKey && firstEl === lastEl ) { event.preventDefault(); } } ); /** * Close menu and scroll to anchor when an anchor link is clicked. * Adapted from Twenty Twenty. * * @since Twenty Twenty-One 1.1 */ document.getElementById( 'site-navigation' ).addEventListener( 'click', function( event ) { // If target onclick is <a> with # within the href attribute if ( event.target.hash ) { wrapper.classList.remove( id + '-navigation-open', 'lock-scrolling' ); twentytwentyoneToggleAriaExpanded( mobileButton ); // Wait 550 and scroll to the anchor. setTimeout(function () { var anchor = document.getElementById(event.target.hash.slice(1)); if ( anchor ) { anchor.scrollIntoView(); } }, 550); } } ); navMenuEl.querySelectorAll( '.menu-wrapper > .menu-item-has-children' ).forEach( function( li ) { li.addEventListener( 'mouseenter', function() { this.querySelector( '.sub-menu-toggle' ).setAttribute( 'aria-expanded', 'true' ); twentytwentyoneSubmenuPosition( li ); } ); li.addEventListener( 'mouseleave', function() { this.querySelector( '.sub-menu-toggle' ).setAttribute( 'aria-expanded', 'false' ); } ); } ); }; window.addEventListener( 'load', function() { new navMenu( 'primary' ); } ); }() );
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