355 lines
9.2 KiB
JavaScript
355 lines
9.2 KiB
JavaScript
/**
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* Touch & Keyboard navigation.
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*
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* Contains handlers for touch devices and keyboard navigation.
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*/
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(function() {
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/**
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* Debounce.
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*
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* @param {Function} func
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* @param {number} wait
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* @param {boolean} immediate
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*/
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function debounce(func, wait, immediate) {
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'use strict';
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var timeout;
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wait = (typeof wait !== 'undefined') ? wait : 20;
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immediate = (typeof immediate !== 'undefined') ? immediate : true;
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return function() {
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var context = this, args = arguments;
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var later = function() {
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timeout = null;
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if (!immediate) {
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func.apply(context, args);
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}
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};
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var callNow = immediate && !timeout;
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clearTimeout(timeout);
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timeout = setTimeout(later, wait);
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if (callNow) {
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func.apply(context, args);
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}
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};
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}
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/**
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* Add class.
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*
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* @param {Object} el
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* @param {string} cls
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*/
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function addClass(el, cls) {
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if ( ! el.className.match( '(?:^|\\s)' + cls + '(?!\\S)') ) {
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el.className += ' ' + cls;
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}
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}
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/**
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* Delete class.
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*
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* @param {Object} el
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* @param {string} cls
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*/
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function deleteClass(el, cls) {
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el.className = el.className.replace( new RegExp( '(?:^|\\s)' + cls + '(?!\\S)' ),'' );
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}
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/**
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* Has class?
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*
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* @param {Object} el
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* @param {string} cls
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*
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* @returns {boolean} Has class
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*/
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function hasClass(el, cls) {
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if ( el.className.match( '(?:^|\\s)' + cls + '(?!\\S)' ) ) {
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return true;
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}
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}
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/**
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* Toggle Aria Expanded state for screenreaders.
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*
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* @param {Object} ariaItem
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*/
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function toggleAriaExpandedState( ariaItem ) {
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'use strict';
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var ariaState = ariaItem.getAttribute('aria-expanded');
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if ( ariaState === 'true' ) {
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ariaState = 'false';
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} else {
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ariaState = 'true';
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}
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ariaItem.setAttribute('aria-expanded', ariaState);
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}
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/**
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* Open sub-menu.
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*
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* @param {Object} currentSubMenu
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*/
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function openSubMenu( currentSubMenu ) {
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'use strict';
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// Update classes.
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// classList.add is not supported in IE11.
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currentSubMenu.parentElement.className += ' off-canvas';
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currentSubMenu.parentElement.lastElementChild.className += ' expanded-true';
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// Update aria-expanded state.
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toggleAriaExpandedState( currentSubMenu );
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}
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/**
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* Close sub-menu.
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*
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* @param {Object} currentSubMenu
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*/
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function closeSubMenu( currentSubMenu ) {
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'use strict';
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var menuItem = getCurrentParent( currentSubMenu, '.menu-item' ); // this.parentNode
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var menuItemAria = menuItem.querySelector('a[aria-expanded]');
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var subMenu = currentSubMenu.closest('.sub-menu');
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// If this is in a sub-sub-menu, go back to parent sub-menu.
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if ( getCurrentParent( currentSubMenu, 'ul' ).classList.contains( 'sub-menu' ) ) {
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// Update classes.
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// classList.remove is not supported in IE11.
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menuItem.className = menuItem.className.replace( 'off-canvas', '' );
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subMenu.className = subMenu.className.replace( 'expanded-true', '' );
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// Update aria-expanded and :focus states.
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toggleAriaExpandedState( menuItemAria );
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// Or else close all sub-menus.
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} else {
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// Update classes.
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// classList.remove is not supported in IE11.
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menuItem.className = menuItem.className.replace( 'off-canvas', '' );
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menuItem.lastElementChild.className = menuItem.lastElementChild.className.replace( 'expanded-true', '' );
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// Update aria-expanded and :focus states.
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toggleAriaExpandedState( menuItemAria );
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}
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}
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/**
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* Find first ancestor of an element by selector.
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*
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* @param {Object} child
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* @param {String} selector
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* @param {String} stopSelector
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*/
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function getCurrentParent( child, selector, stopSelector ) {
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var currentParent = null;
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while ( child ) {
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if ( child.matches(selector) ) {
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currentParent = child;
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break;
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} else if ( stopSelector && child.matches(stopSelector) ) {
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break;
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}
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child = child.parentElement;
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}
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return currentParent;
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}
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/**
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* Remove all off-canvas states.
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*/
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function removeAllFocusStates() {
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'use strict';
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var siteBranding = document.getElementsByClassName( 'site-branding' )[0];
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var getFocusedElements = siteBranding.querySelectorAll(':hover, :focus, :focus-within');
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var getFocusedClassElements = siteBranding.querySelectorAll('.is-focused');
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var i;
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var o;
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for ( i = 0; i < getFocusedElements.length; i++) {
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getFocusedElements[i].blur();
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}
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for ( o = 0; o < getFocusedClassElements.length; o++) {
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deleteClass( getFocusedClassElements[o], 'is-focused' );
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}
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}
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/**
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* Matches polyfill for IE11.
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*/
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if (!Element.prototype.matches) {
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Element.prototype.matches = Element.prototype.msMatchesSelector;
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}
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/**
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* Toggle `focus` class to allow sub-menu access on touch screens.
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*/
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function toggleSubmenuDisplay() {
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document.addEventListener('touchstart', function(event) {
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if ( event.target.matches('a') ) {
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var url = event.target.getAttribute( 'href' ) ? event.target.getAttribute( 'href' ) : '';
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// Open submenu if URL is #.
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if ( '#' === url && event.target.nextSibling.matches('.submenu-expand') ) {
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openSubMenu( event.target );
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}
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}
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// Check if .submenu-expand is touched.
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if ( event.target.matches('.submenu-expand') ) {
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openSubMenu(event.target);
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// Check if child of .submenu-expand is touched.
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} else if ( null != getCurrentParent( event.target, '.submenu-expand' ) &&
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getCurrentParent( event.target, '.submenu-expand' ).matches( '.submenu-expand' ) ) {
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openSubMenu( getCurrentParent( event.target, '.submenu-expand' ) );
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// Check if .menu-item-link-return is touched.
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} else if ( event.target.matches('.menu-item-link-return') ) {
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closeSubMenu( event.target );
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// Check if child of .menu-item-link-return is touched.
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} else if ( null != getCurrentParent( event.target, '.menu-item-link-return' ) && getCurrentParent( event.target, '.menu-item-link-return' ).matches( '.menu-item-link-return' ) ) {
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closeSubMenu( event.target );
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}
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// Prevent default mouse/focus events.
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removeAllFocusStates();
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}, false);
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document.addEventListener('touchend', function(event) {
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var mainNav = getCurrentParent( event.target, '.main-navigation' );
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if ( null != mainNav && hasClass( mainNav, '.main-navigation' ) ) {
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// Prevent default mouse events.
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event.preventDefault();
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} else if (
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event.target.matches('.submenu-expand') ||
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null != getCurrentParent( event.target, '.submenu-expand' ) &&
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getCurrentParent( event.target, '.submenu-expand' ).matches( '.submenu-expand' ) ||
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event.target.matches('.menu-item-link-return') ||
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null != getCurrentParent( event.target, '.menu-item-link-return' ) &&
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getCurrentParent( event.target, '.menu-item-link-return' ).matches( '.menu-item-link-return' ) ) {
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// Prevent default mouse events.
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event.preventDefault();
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}
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// Prevent default mouse/focus events.
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removeAllFocusStates();
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}, false);
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document.addEventListener('focus', function(event) {
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if ( event.target.matches('.main-navigation > div > ul > li a') ) {
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// Remove Focused elements in sibling div.
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var currentDiv = getCurrentParent( event.target, 'div', '.main-navigation' );
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var currentDivSibling = currentDiv.previousElementSibling === null ? currentDiv.nextElementSibling : currentDiv.previousElementSibling;
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var focusedElement = currentDivSibling.querySelector( '.is-focused' );
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var focusedClass = 'is-focused';
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var prevLi = getCurrentParent( event.target, '.main-navigation > div > ul > li', '.main-navigation' ).previousElementSibling;
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var nextLi = getCurrentParent( event.target, '.main-navigation > div > ul > li', '.main-navigation' ).nextElementSibling;
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if ( null !== focusedElement && null !== hasClass( focusedElement, focusedClass ) ) {
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deleteClass( focusedElement, focusedClass );
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}
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// Add .is-focused class to top-level li.
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if ( getCurrentParent( event.target, '.main-navigation > div > ul > li', '.main-navigation' ) ) {
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addClass( getCurrentParent( event.target, '.main-navigation > div > ul > li', '.main-navigation' ), focusedClass );
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}
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// Check for previous li.
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if ( prevLi && hasClass( prevLi, focusedClass ) ) {
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deleteClass( prevLi, focusedClass );
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}
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// Check for next li.
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if ( nextLi && hasClass( nextLi, focusedClass ) ) {
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deleteClass( nextLi, focusedClass );
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}
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}
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}, true);
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document.addEventListener('click', function(event) {
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// Remove all focused menu states when clicking outside site branding.
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if ( event.target !== document.getElementsByClassName( 'site-branding' )[0] ) {
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removeAllFocusStates();
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} else {
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// Nothing.
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}
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}, false);
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}
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/**
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* Run our sub-menu function as soon as the document is `ready`.
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*/
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document.addEventListener( 'DOMContentLoaded', function() {
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toggleSubmenuDisplay();
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});
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/**
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* Run our sub-menu function on selective refresh in the customizer.
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*/
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document.addEventListener( 'customize-preview-menu-refreshed', function( e, params ) {
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if ( 'menu-1' === params.wpNavMenuArgs.theme_location ) {
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toggleSubmenuDisplay();
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}
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});
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/**
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* Run our sub-menu function every time the window resizes.
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*/
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var isResizing = false;
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window.addEventListener( 'resize', function() {
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isResizing = true;
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debounce( function() {
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if ( isResizing ) {
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return;
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}
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toggleSubmenuDisplay();
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isResizing = false;
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}, 150 );
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} );
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})();
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