mirror of
https://github.com/WordPress/WordPress.git
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217 lines
5.2 KiB
JavaScript
217 lines
5.2 KiB
JavaScript
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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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* Prepends an element to a container.
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*
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* @param {Element} container
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* @param {Element} element
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*/
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function prependElement(container, element) {
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if (container.firstChild.nextSibling) {
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return container.insertBefore(element, container.firstChild.nextSibling);
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} else {
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return container.appendChild(element);
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}
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}
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/**
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* Shows an element by adding a hidden className.
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*
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* @param {Element} element
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*/
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function showButton(element) {
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// classList.remove is not supported in IE11
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element.className = element.className.replace('is-empty', '');
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}
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/**
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* Hides an element by removing the hidden className.
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*
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* @param {Element} element
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*/
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function hideButton(element) {
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// classList.add is not supported in IE11
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if (!element.classList.contains('is-empty')) {
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element.className += ' is-empty';
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}
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}
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/**
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* Returns the currently available space in the menu container.
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*
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* @returns {number} Available space
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*/
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function getAvailableSpace( button, container ) {
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return container.offsetWidth - button.offsetWidth - 22;
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}
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/**
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* Returns whether the current menu is overflowing or not.
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*
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* @returns {boolean} Is overflowing
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*/
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function isOverflowingNavivation( list, button, container ) {
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return list.offsetWidth > getAvailableSpace( button, container );
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}
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/**
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* Set menu container variable
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*/
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var navContainer = document.querySelector('.main-navigation');
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var breaks = [];
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/**
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* Let’s bail if we our menu doesn't exist
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*/
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if ( ! navContainer ) {
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return;
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}
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/**
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* Refreshes the list item from the menu depending on the menu size
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*/
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function updateNavigationMenu( container ) {
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/**
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* Let’s bail if our menu is empty
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*/
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if ( ! container.parentNode.querySelector('.main-menu[id]') ) {
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return;
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}
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// Adds the necessary UI to operate the menu.
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var visibleList = container.parentNode.querySelector('.main-menu[id]');
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var hiddenList = visibleList.parentNode.nextElementSibling.querySelector('.hidden-links');
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var toggleButton = visibleList.parentNode.nextElementSibling.querySelector('.main-menu-more-toggle');
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if ( isOverflowingNavivation( visibleList, toggleButton, container ) ) {
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// Record the width of the list
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breaks.push( visibleList.offsetWidth );
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// Move last item to the hidden list
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prependElement( hiddenList, ! visibleList.lastChild || null === visibleList.lastChild ? visibleList.previousElementSibling : visibleList.lastChild );
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// Show the toggle button
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showButton( toggleButton );
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} else {
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// There is space for another item in the nav
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if ( getAvailableSpace( toggleButton, container ) > breaks[breaks.length - 1] ) {
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// Move the item to the visible list
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visibleList.appendChild( hiddenList.firstChild.nextSibling );
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breaks.pop();
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}
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// Hide the dropdown btn if hidden list is empty
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if (breaks.length < 2) {
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hideButton( toggleButton );
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}
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}
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// Recur if the visible list is still overflowing the nav
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if ( isOverflowingNavivation( visibleList, toggleButton, container ) ) {
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updateNavigationMenu( container );
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}
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}
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/**
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* Run our priority+ function as soon as the document is `ready`
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*/
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document.addEventListener( 'DOMContentLoaded', function() {
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updateNavigationMenu( navContainer );
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// Also, run our priority+ function on selective refresh in the customizer
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var hasSelectiveRefresh = (
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'undefined' !== typeof wp &&
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wp.customize &&
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wp.customize.selectiveRefresh &&
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wp.customize.navMenusPreview.NavMenuInstancePartial
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);
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if ( hasSelectiveRefresh ) {
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// Re-run our priority+ function on Nav Menu partial refreshes
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wp.customize.selectiveRefresh.bind( 'partial-content-rendered', function ( placement ) {
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var isNewNavMenu = (
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placement &&
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placement.partial.id.includes( 'nav_menu_instance' ) &&
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'null' !== placement.container[0].parentNode &&
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placement.container[0].parentNode.classList.contains( 'main-navigation' )
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);
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if ( isNewNavMenu ) {
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updateNavigationMenu( placement.container[0].parentNode );
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}
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});
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}
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});
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/**
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* Run our priority+ function on load
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*/
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window.addEventListener( 'load', function() {
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updateNavigationMenu( navContainer );
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});
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/**
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* Run our priority+ function every time the window resizes
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*/
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var isResizing = false;
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window.addEventListener( 'resize',
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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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isResizing = true;
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setTimeout( function() {
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updateNavigationMenu( navContainer );
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isResizing = false;
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}, 150 );
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} )
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);
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/**
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* Run our priority+ function
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*/
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updateNavigationMenu( navContainer );
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})();
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