forked from mirror/_s
117 lines
3.2 KiB
JavaScript
117 lines
3.2 KiB
JavaScript
/**
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* File navigation.js.
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*
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* Handles toggling the navigation menu for small screens and enables TAB key
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* navigation support for dropdown menus.
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*/
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( function() {
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var container, button, menu, links, i, len;
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container = document.getElementById( 'site-navigation' );
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if ( ! container ) {
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return;
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}
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button = container.getElementsByTagName( 'button' )[0];
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if ( 'undefined' === typeof button ) {
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return;
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}
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menu = container.getElementsByTagName( 'ul' )[0];
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// Hide menu toggle button if menu is empty and return early.
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if ( 'undefined' === typeof menu ) {
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button.style.display = 'none';
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return;
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}
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menu.setAttribute( 'aria-expanded', 'false' );
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if ( -1 === menu.className.indexOf( 'nav-menu' ) ) {
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menu.className += ' nav-menu';
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}
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button.onclick = function() {
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if ( -1 !== container.className.indexOf( 'toggled' ) ) {
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container.className = container.className.replace( ' toggled', '' );
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button.setAttribute( 'aria-expanded', 'false' );
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menu.setAttribute( 'aria-expanded', 'false' );
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} else {
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container.className += ' toggled';
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button.setAttribute( 'aria-expanded', 'true' );
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menu.setAttribute( 'aria-expanded', 'true' );
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}
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};
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// Close small menu when user clicks outside
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document.addEventListener( 'click', function( event ) {
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var isClickInside = container.contains( event.target );
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if ( ! isClickInside ) {
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container.className = container.className.replace( ' toggled', '' );
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button.setAttribute( 'aria-expanded', 'false' );
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menu.setAttribute( 'aria-expanded', 'false' );
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}
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} );
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// Get all the link elements within the menu.
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links = menu.getElementsByTagName( 'a' );
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// Each time a menu link is focused or blurred, toggle focus.
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for ( i = 0, len = links.length; i < len; i++ ) {
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links[i].addEventListener( 'focus', toggleFocus, true );
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links[i].addEventListener( 'blur', toggleFocus, true );
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}
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/**
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* Sets or removes .focus class on an element.
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*/
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function toggleFocus() {
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var self = this;
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// Move up through the ancestors of the current link until we hit .nav-menu.
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while ( -1 === self.className.indexOf( 'nav-menu' ) ) {
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// On li elements toggle the class .focus.
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if ( 'li' === self.tagName.toLowerCase() ) {
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if ( -1 !== self.className.indexOf( 'focus' ) ) {
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self.className = self.className.replace( ' focus', '' );
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} else {
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self.className += ' focus';
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}
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}
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self = self.parentElement;
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}
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}
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/**
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* Toggles `focus` class to allow submenu access on tablets.
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*/
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( function() {
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var touchStartFn,
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parentLink = container.querySelectorAll( '.menu-item-has-children > a, .page_item_has_children > a' );
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if ( 'ontouchstart' in window ) {
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touchStartFn = function( e ) {
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var menuItem = this.parentNode;
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if ( ! menuItem.classList.contains( 'focus' ) ) {
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e.preventDefault();
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for ( i = 0; i < menuItem.parentNode.children.length; ++i ) {
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if ( menuItem === menuItem.parentNode.children[i] ) {
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continue;
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}
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menuItem.parentNode.children[i].classList.remove( 'focus' );
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}
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menuItem.classList.add( 'focus' );
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} else {
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menuItem.classList.remove( 'focus' );
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}
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};
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for ( i = 0; i < parentLink.length; ++i ) {
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parentLink[i].addEventListener( 'touchstart', touchStartFn, false );
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}
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}
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}( container ) );
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}() );
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