ru-se.com

nav-menu.js (50595B)

---

 /**
  * WordPress Administration Navigation Menu
  * Interface JS functions
  *
  * @version 2.0.0
  *
  * @package WordPress
  * @subpackage Administration
  * @output wp-admin/js/nav-menu.js
  */
 
 /* global menus, postboxes, columns, isRtl, ajaxurl, wpNavMenu */
 
 (function($) {
 
 	var api;
 
 	/**
 	 * Contains all the functions to handle WordPress navigation menus administration.
 	 *
 	 * @namespace wpNavMenu
 	 */
 	api = window.wpNavMenu = {
 
 		options : {
 			menuItemDepthPerLevel : 30, // Do not use directly. Use depthToPx and pxToDepth instead.
 			globalMaxDepth:  11,
 			sortableItems:   '> *',
 			targetTolerance: 0
 		},
 
 		menuList : undefined,	// Set in init.
 		targetList : undefined, // Set in init.
 		menusChanged : false,
 		isRTL: !! ( 'undefined' != typeof isRtl && isRtl ),
 		negateIfRTL: ( 'undefined' != typeof isRtl && isRtl ) ? -1 : 1,
 		lastSearch: '',
 
 		// Functions that run on init.
 		init : function() {
 			api.menuList = $('#menu-to-edit');
 			api.targetList = api.menuList;
 
 			this.jQueryExtensions();
 
 			this.attachMenuEditListeners();
 
 			this.attachBulkSelectButtonListeners();
 			this.attachMenuCheckBoxListeners();
 			this.attachMenuItemDeleteButton();
 			this.attachPendingMenuItemsListForDeletion();
 
 			this.attachQuickSearchListeners();
 			this.attachThemeLocationsListeners();
 			this.attachMenuSaveSubmitListeners();
 
 			this.attachTabsPanelListeners();
 
 			this.attachUnsavedChangesListener();
 
 			if ( api.menuList.length )
 				this.initSortables();
 
 			if ( menus.oneThemeLocationNoMenus )
 				$( '#posttype-page' ).addSelectedToMenu( api.addMenuItemToBottom );
 
 			this.initManageLocations();
 
 			this.initAccessibility();
 
 			this.initToggles();
 
 			this.initPreviewing();
 		},
 
 		jQueryExtensions : function() {
 			// jQuery extensions.
 			$.fn.extend({
 				menuItemDepth : function() {
 					var margin = api.isRTL ? this.eq(0).css('margin-right') : this.eq(0).css('margin-left');
 					return api.pxToDepth( margin && -1 != margin.indexOf('px') ? margin.slice(0, -2) : 0 );
 				},
 				updateDepthClass : function(current, prev) {
 					return this.each(function(){
 						var t = $(this);
 						prev = prev || t.menuItemDepth();
 						$(this).removeClass('menu-item-depth-'+ prev )
 							.addClass('menu-item-depth-'+ current );
 					});
 				},
 				shiftDepthClass : function(change) {
 					return this.each(function(){
 						var t = $(this),
 							depth = t.menuItemDepth(),
 							newDepth = depth + change;
 
 						t.removeClass( 'menu-item-depth-'+ depth )
 							.addClass( 'menu-item-depth-'+ ( newDepth ) );
 
 						if ( 0 === newDepth ) {
 							t.find( '.is-submenu' ).hide();
 						}
 					});
 				},
 				childMenuItems : function() {
 					var result = $();
 					this.each(function(){
 						var t = $(this), depth = t.menuItemDepth(), next = t.next( '.menu-item' );
 						while( next.length && next.menuItemDepth() > depth ) {
 							result = result.add( next );
 							next = next.next( '.menu-item' );
 						}
 					});
 					return result;
 				},
 				shiftHorizontally : function( dir ) {
 					return this.each(function(){
 						var t = $(this),
 							depth = t.menuItemDepth(),
 							newDepth = depth + dir;
 
 						// Change .menu-item-depth-n class.
 						t.moveHorizontally( newDepth, depth );
 					});
 				},
 				moveHorizontally : function( newDepth, depth ) {
 					return this.each(function(){
 						var t = $(this),
 							children = t.childMenuItems(),
 							diff = newDepth - depth,
 							subItemText = t.find('.is-submenu');
 
 						// Change .menu-item-depth-n class.
 						t.updateDepthClass( newDepth, depth ).updateParentMenuItemDBId();
 
 						// If it has children, move those too.
 						if ( children ) {
 							children.each(function() {
 								var t = $(this),
 									thisDepth = t.menuItemDepth(),
 									newDepth = thisDepth + diff;
 								t.updateDepthClass(newDepth, thisDepth).updateParentMenuItemDBId();
 							});
 						}
 
 						// Show "Sub item" helper text.
 						if (0 === newDepth)
 							subItemText.hide();
 						else
 							subItemText.show();
 					});
 				},
 				updateParentMenuItemDBId : function() {
 					return this.each(function(){
 						var item = $(this),
 							input = item.find( '.menu-item-data-parent-id' ),
 							depth = parseInt( item.menuItemDepth(), 10 ),
 							parentDepth = depth - 1,
 							parent = item.prevAll( '.menu-item-depth-' + parentDepth ).first();
 
 						if ( 0 === depth ) { // Item is on the top level, has no parent.
 							input.val(0);
 						} else { // Find the parent item, and retrieve its object id.
 							input.val( parent.find( '.menu-item-data-db-id' ).val() );
 						}
 					});
 				},
 				hideAdvancedMenuItemFields : function() {
 					return this.each(function(){
 						var that = $(this);
 						$('.hide-column-tog').not(':checked').each(function(){
 							that.find('.field-' + $(this).val() ).addClass('hidden-field');
 						});
 					});
 				},
 				/**
 				 * Adds selected menu items to the menu.
 				 *
 				 * @ignore
 				 *
 				 * @param jQuery metabox The metabox jQuery object.
 				 */
 				addSelectedToMenu : function(processMethod) {
 					if ( 0 === $('#menu-to-edit').length ) {
 						return false;
 					}
 
 					return this.each(function() {
 						var t = $(this), menuItems = {},
 							checkboxes = ( menus.oneThemeLocationNoMenus && 0 === t.find( '.tabs-panel-active .categorychecklist li input:checked' ).length ) ? t.find( '#page-all li input[type="checkbox"]' ) : t.find( '.tabs-panel-active .categorychecklist li input:checked' ),
 							re = /menu-item\[([^\]]*)/;
 
 						processMethod = processMethod || api.addMenuItemToBottom;
 
 						// If no items are checked, bail.
 						if ( !checkboxes.length )
 							return false;
 
 						// Show the Ajax spinner.
 						t.find( '.button-controls .spinner' ).addClass( 'is-active' );
 
 						// Retrieve menu item data.
 						$(checkboxes).each(function(){
 							var t = $(this),
 								listItemDBIDMatch = re.exec( t.attr('name') ),
 								listItemDBID = 'undefined' == typeof listItemDBIDMatch[1] ? 0 : parseInt(listItemDBIDMatch[1], 10);
 
 							if ( this.className && -1 != this.className.indexOf('add-to-top') )
 								processMethod = api.addMenuItemToTop;
 							menuItems[listItemDBID] = t.closest('li').getItemData( 'add-menu-item', listItemDBID );
 						});
 
 						// Add the items.
 						api.addItemToMenu(menuItems, processMethod, function(){
 							// Deselect the items and hide the Ajax spinner.
 							checkboxes.prop( 'checked', false );
 							t.find( '.button-controls .select-all' ).prop( 'checked', false );
 							t.find( '.button-controls .spinner' ).removeClass( 'is-active' );
 						});
 					});
 				},
 				getItemData : function( itemType, id ) {
 					itemType = itemType || 'menu-item';
 
 					var itemData = {}, i,
 					fields = [
 						'menu-item-db-id',
 						'menu-item-object-id',
 						'menu-item-object',
 						'menu-item-parent-id',
 						'menu-item-position',
 						'menu-item-type',
 						'menu-item-title',
 						'menu-item-url',
 						'menu-item-description',
 						'menu-item-attr-title',
 						'menu-item-target',
 						'menu-item-classes',
 						'menu-item-xfn'
 					];
 
 					if( !id && itemType == 'menu-item' ) {
 						id = this.find('.menu-item-data-db-id').val();
 					}
 
 					if( !id ) return itemData;
 
 					this.find('input').each(function() {
 						var field;
 						i = fields.length;
 						while ( i-- ) {
 							if( itemType == 'menu-item' )
 								field = fields[i] + '[' + id + ']';
 							else if( itemType == 'add-menu-item' )
 								field = 'menu-item[' + id + '][' + fields[i] + ']';
 
 							if (
 								this.name &&
 								field == this.name
 							) {
 								itemData[fields[i]] = this.value;
 							}
 						}
 					});
 
 					return itemData;
 				},
 				setItemData : function( itemData, itemType, id ) { // Can take a type, such as 'menu-item', or an id.
 					itemType = itemType || 'menu-item';
 
 					if( !id && itemType == 'menu-item' ) {
 						id = $('.menu-item-data-db-id', this).val();
 					}
 
 					if( !id ) return this;
 
 					this.find('input').each(function() {
 						var t = $(this), field;
 						$.each( itemData, function( attr, val ) {
 							if( itemType == 'menu-item' )
 								field = attr + '[' + id + ']';
 							else if( itemType == 'add-menu-item' )
 								field = 'menu-item[' + id + '][' + attr + ']';
 
 							if ( field == t.attr('name') ) {
 								t.val( val );
 							}
 						});
 					});
 					return this;
 				}
 			});
 		},
 
 		countMenuItems : function( depth ) {
 			return $( '.menu-item-depth-' + depth ).length;
 		},
 
 		moveMenuItem : function( $this, dir ) {
 
 			var items, newItemPosition, newDepth,
 				menuItems = $( '#menu-to-edit li' ),
 				menuItemsCount = menuItems.length,
 				thisItem = $this.parents( 'li.menu-item' ),
 				thisItemChildren = thisItem.childMenuItems(),
 				thisItemData = thisItem.getItemData(),
 				thisItemDepth = parseInt( thisItem.menuItemDepth(), 10 ),
 				thisItemPosition = parseInt( thisItem.index(), 10 ),
 				nextItem = thisItem.next(),
 				nextItemChildren = nextItem.childMenuItems(),
 				nextItemDepth = parseInt( nextItem.menuItemDepth(), 10 ) + 1,
 				prevItem = thisItem.prev(),
 				prevItemDepth = parseInt( prevItem.menuItemDepth(), 10 ),
 				prevItemId = prevItem.getItemData()['menu-item-db-id'];
 
 			switch ( dir ) {
 			case 'up':
 				newItemPosition = thisItemPosition - 1;
 
 				// Already at top.
 				if ( 0 === thisItemPosition )
 					break;
 
 				// If a sub item is moved to top, shift it to 0 depth.
 				if ( 0 === newItemPosition && 0 !== thisItemDepth )
 					thisItem.moveHorizontally( 0, thisItemDepth );
 
 				// If prev item is sub item, shift to match depth.
 				if ( 0 !== prevItemDepth )
 					thisItem.moveHorizontally( prevItemDepth, thisItemDepth );
 
 				// Does this item have sub items?
 				if ( thisItemChildren ) {
 					items = thisItem.add( thisItemChildren );
 					// Move the entire block.
 					items.detach().insertBefore( menuItems.eq( newItemPosition ) ).updateParentMenuItemDBId();
 				} else {
 					thisItem.detach().insertBefore( menuItems.eq( newItemPosition ) ).updateParentMenuItemDBId();
 				}
 				break;
 			case 'down':
 				// Does this item have sub items?
 				if ( thisItemChildren ) {
 					items = thisItem.add( thisItemChildren ),
 						nextItem = menuItems.eq( items.length + thisItemPosition ),
 						nextItemChildren = 0 !== nextItem.childMenuItems().length;
 
 					if ( nextItemChildren ) {
 						newDepth = parseInt( nextItem.menuItemDepth(), 10 ) + 1;
 						thisItem.moveHorizontally( newDepth, thisItemDepth );
 					}
 
 					// Have we reached the bottom?
 					if ( menuItemsCount === thisItemPosition + items.length )
 						break;
 
 					items.detach().insertAfter( menuItems.eq( thisItemPosition + items.length ) ).updateParentMenuItemDBId();
 				} else {
 					// If next item has sub items, shift depth.
 					if ( 0 !== nextItemChildren.length )
 						thisItem.moveHorizontally( nextItemDepth, thisItemDepth );
 
 					// Have we reached the bottom?
 					if ( menuItemsCount === thisItemPosition + 1 )
 						break;
 					thisItem.detach().insertAfter( menuItems.eq( thisItemPosition + 1 ) ).updateParentMenuItemDBId();
 				}
 				break;
 			case 'top':
 				// Already at top.
 				if ( 0 === thisItemPosition )
 					break;
 				// Does this item have sub items?
 				if ( thisItemChildren ) {
 					items = thisItem.add( thisItemChildren );
 					// Move the entire block.
 					items.detach().insertBefore( menuItems.eq( 0 ) ).updateParentMenuItemDBId();
 				} else {
 					thisItem.detach().insertBefore( menuItems.eq( 0 ) ).updateParentMenuItemDBId();
 				}
 				break;
 			case 'left':
 				// As far left as possible.
 				if ( 0 === thisItemDepth )
 					break;
 				thisItem.shiftHorizontally( -1 );
 				break;
 			case 'right':
 				// Can't be sub item at top.
 				if ( 0 === thisItemPosition )
 					break;
 				// Already sub item of prevItem.
 				if ( thisItemData['menu-item-parent-id'] === prevItemId )
 					break;
 				thisItem.shiftHorizontally( 1 );
 				break;
 			}
 			$this.trigger( 'focus' );
 			api.registerChange();
 			api.refreshKeyboardAccessibility();
 			api.refreshAdvancedAccessibility();
 		},
 
 		initAccessibility : function() {
 			var menu = $( '#menu-to-edit' );
 
 			api.refreshKeyboardAccessibility();
 			api.refreshAdvancedAccessibility();
 
 			// Refresh the accessibility when the user comes close to the item in any way.
 			menu.on( 'mouseenter.refreshAccessibility focus.refreshAccessibility touchstart.refreshAccessibility' , '.menu-item' , function(){
 				api.refreshAdvancedAccessibilityOfItem( $( this ).find( 'a.item-edit' ) );
 			} );
 
 			// We have to update on click as well because we might hover first, change the item, and then click.
 			menu.on( 'click', 'a.item-edit', function() {
 				api.refreshAdvancedAccessibilityOfItem( $( this ) );
 			} );
 
 			// Links for moving items.
 			menu.on( 'click', '.menus-move', function () {
 				var $this = $( this ),
 					dir = $this.data( 'dir' );
 
 				if ( 'undefined' !== typeof dir ) {
 					api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), dir );
 				}
 			});
 		},
 
 		/**
 		 * refreshAdvancedAccessibilityOfItem( [itemToRefresh] )
 		 *
 		 * Refreshes advanced accessibility buttons for one menu item.
 		 * Shows or hides buttons based on the location of the menu item.
 		 *
 		 * @param {Object} itemToRefresh The menu item that might need its advanced accessibility buttons refreshed
 		 */
 		refreshAdvancedAccessibilityOfItem : function( itemToRefresh ) {
 
 			// Only refresh accessibility when necessary.
 			if ( true !== $( itemToRefresh ).data( 'needs_accessibility_refresh' ) ) {
 				return;
 			}
 
 			var thisLink, thisLinkText, primaryItems, itemPosition, title,
 				parentItem, parentItemId, parentItemName, subItems,
 				$this = $( itemToRefresh ),
 				menuItem = $this.closest( 'li.menu-item' ).first(),
 				depth = menuItem.menuItemDepth(),
 				isPrimaryMenuItem = ( 0 === depth ),
 				itemName = $this.closest( '.menu-item-handle' ).find( '.menu-item-title' ).text(),
 				position = parseInt( menuItem.index(), 10 ),
 				prevItemDepth = ( isPrimaryMenuItem ) ? depth : parseInt( depth - 1, 10 ),
 				prevItemNameLeft = menuItem.prevAll('.menu-item-depth-' + prevItemDepth).first().find( '.menu-item-title' ).text(),
 				prevItemNameRight = menuItem.prevAll('.menu-item-depth-' + depth).first().find( '.menu-item-title' ).text(),
 				totalMenuItems = $('#menu-to-edit li').length,
 				hasSameDepthSibling = menuItem.nextAll( '.menu-item-depth-' + depth ).length;
 
 				menuItem.find( '.field-move' ).toggle( totalMenuItems > 1 );
 
 			// Where can they move this menu item?
 			if ( 0 !== position ) {
 				thisLink = menuItem.find( '.menus-move-up' );
 				thisLink.attr( 'aria-label', menus.moveUp ).css( 'display', 'inline' );
 			}
 
 			if ( 0 !== position && isPrimaryMenuItem ) {
 				thisLink = menuItem.find( '.menus-move-top' );
 				thisLink.attr( 'aria-label', menus.moveToTop ).css( 'display', 'inline' );
 			}
 
 			if ( position + 1 !== totalMenuItems && 0 !== position ) {
 				thisLink = menuItem.find( '.menus-move-down' );
 				thisLink.attr( 'aria-label', menus.moveDown ).css( 'display', 'inline' );
 			}
 
 			if ( 0 === position && 0 !== hasSameDepthSibling ) {
 				thisLink = menuItem.find( '.menus-move-down' );
 				thisLink.attr( 'aria-label', menus.moveDown ).css( 'display', 'inline' );
 			}
 
 			if ( ! isPrimaryMenuItem ) {
 				thisLink = menuItem.find( '.menus-move-left' ),
 				thisLinkText = menus.outFrom.replace( '%s', prevItemNameLeft );
 				thisLink.attr( 'aria-label', menus.moveOutFrom.replace( '%s', prevItemNameLeft ) ).text( thisLinkText ).css( 'display', 'inline' );
 			}
 
 			if ( 0 !== position ) {
 				if ( menuItem.find( '.menu-item-data-parent-id' ).val() !== menuItem.prev().find( '.menu-item-data-db-id' ).val() ) {
 					thisLink = menuItem.find( '.menus-move-right' ),
 					thisLinkText = menus.under.replace( '%s', prevItemNameRight );
 					thisLink.attr( 'aria-label', menus.moveUnder.replace( '%s', prevItemNameRight ) ).text( thisLinkText ).css( 'display', 'inline' );
 				}
 			}
 
 			if ( isPrimaryMenuItem ) {
 				primaryItems = $( '.menu-item-depth-0' ),
 				itemPosition = primaryItems.index( menuItem ) + 1,
 				totalMenuItems = primaryItems.length,
 
 				// String together help text for primary menu items.
 				title = menus.menuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$d', totalMenuItems );
 			} else {
 				parentItem = menuItem.prevAll( '.menu-item-depth-' + parseInt( depth - 1, 10 ) ).first(),
 				parentItemId = parentItem.find( '.menu-item-data-db-id' ).val(),
 				parentItemName = parentItem.find( '.menu-item-title' ).text(),
 				subItems = $( '.menu-item .menu-item-data-parent-id[value="' + parentItemId + '"]' ),
 				itemPosition = $( subItems.parents('.menu-item').get().reverse() ).index( menuItem ) + 1;
 
 				// String together help text for sub menu items.
 				title = menus.subMenuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$s', parentItemName );
 			}
 
 			$this.attr( 'aria-label', title );
 
 			// Mark this item's accessibility as refreshed.
 			$this.data( 'needs_accessibility_refresh', false );
 		},
 
 		/**
 		 * refreshAdvancedAccessibility
 		 *
 		 * Hides all advanced accessibility buttons and marks them for refreshing.
 		 */
 		refreshAdvancedAccessibility : function() {
 
 			// Hide all the move buttons by default.
 			$( '.menu-item-settings .field-move .menus-move' ).hide();
 
 			// Mark all menu items as unprocessed.
 			$( 'a.item-edit' ).data( 'needs_accessibility_refresh', true );
 
 			// All open items have to be refreshed or they will show no links.
 			$( '.menu-item-edit-active a.item-edit' ).each( function() {
 				api.refreshAdvancedAccessibilityOfItem( this );
 			} );
 		},
 
 		refreshKeyboardAccessibility : function() {
 			$( 'a.item-edit' ).off( 'focus' ).on( 'focus', function(){
 				$(this).off( 'keydown' ).on( 'keydown', function(e){
 
 					var arrows,
 						$this = $( this ),
 						thisItem = $this.parents( 'li.menu-item' ),
 						thisItemData = thisItem.getItemData();
 
 					// Bail if it's not an arrow key.
 					if ( 37 != e.which && 38 != e.which && 39 != e.which && 40 != e.which )
 						return;
 
 					// Avoid multiple keydown events.
 					$this.off('keydown');
 
 					// Bail if there is only one menu item.
 					if ( 1 === $('#menu-to-edit li').length )
 						return;
 
 					// If RTL, swap left/right arrows.
 					arrows = { '38': 'up', '40': 'down', '37': 'left', '39': 'right' };
 					if ( $('body').hasClass('rtl') )
 						arrows = { '38' : 'up', '40' : 'down', '39' : 'left', '37' : 'right' };
 
 					switch ( arrows[e.which] ) {
 					case 'up':
 						api.moveMenuItem( $this, 'up' );
 						break;
 					case 'down':
 						api.moveMenuItem( $this, 'down' );
 						break;
 					case 'left':
 						api.moveMenuItem( $this, 'left' );
 						break;
 					case 'right':
 						api.moveMenuItem( $this, 'right' );
 						break;
 					}
 					// Put focus back on same menu item.
 					$( '#edit-' + thisItemData['menu-item-db-id'] ).trigger( 'focus' );
 					return false;
 				});
 			});
 		},
 
 		initPreviewing : function() {
 			// Update the item handle title when the navigation label is changed.
 			$( '#menu-to-edit' ).on( 'change input', '.edit-menu-item-title', function(e) {
 				var input = $( e.currentTarget ), title, titleEl;
 				title = input.val();
 				titleEl = input.closest( '.menu-item' ).find( '.menu-item-title' );
 				// Don't update to empty title.
 				if ( title ) {
 					titleEl.text( title ).removeClass( 'no-title' );
 				} else {
 					titleEl.text( wp.i18n._x( '(no label)', 'missing menu item navigation label' ) ).addClass( 'no-title' );
 				}
 			} );
 		},
 
 		initToggles : function() {
 			// Init postboxes.
 			postboxes.add_postbox_toggles('nav-menus');
 
 			// Adjust columns functions for menus UI.
 			columns.useCheckboxesForHidden();
 			columns.checked = function(field) {
 				$('.field-' + field).removeClass('hidden-field');
 			};
 			columns.unchecked = function(field) {
 				$('.field-' + field).addClass('hidden-field');
 			};
 			// Hide fields.
 			api.menuList.hideAdvancedMenuItemFields();
 
 			$('.hide-postbox-tog').on( 'click', function () {
 				var hidden = $( '.accordion-container li.accordion-section' ).filter(':hidden').map(function() { return this.id; }).get().join(',');
 				$.post(ajaxurl, {
 					action: 'closed-postboxes',
 					hidden: hidden,
 					closedpostboxesnonce: jQuery('#closedpostboxesnonce').val(),
 					page: 'nav-menus'
 				});
 			});
 		},
 
 		initSortables : function() {
 			var currentDepth = 0, originalDepth, minDepth, maxDepth,
 				prev, next, prevBottom, nextThreshold, helperHeight, transport,
 				menuEdge = api.menuList.offset().left,
 				body = $('body'), maxChildDepth,
 				menuMaxDepth = initialMenuMaxDepth();
 
 			if( 0 !== $( '#menu-to-edit li' ).length )
 				$( '.drag-instructions' ).show();
 
 			// Use the right edge if RTL.
 			menuEdge += api.isRTL ? api.menuList.width() : 0;
 
 			api.menuList.sortable({
 				handle: '.menu-item-handle',
 				placeholder: 'sortable-placeholder',
 				items: api.options.sortableItems,
 				start: function(e, ui) {
 					var height, width, parent, children, tempHolder;
 
 					// Handle placement for RTL orientation.
 					if ( api.isRTL )
 						ui.item[0].style.right = 'auto';
 
 					transport = ui.item.children('.menu-item-transport');
 
 					// Set depths. currentDepth must be set before children are located.
 					originalDepth = ui.item.menuItemDepth();
 					updateCurrentDepth(ui, originalDepth);
 
 					// Attach child elements to parent.
 					// Skip the placeholder.
 					parent = ( ui.item.next()[0] == ui.placeholder[0] ) ? ui.item.next() : ui.item;
 					children = parent.childMenuItems();
 					transport.append( children );
 
 					// Update the height of the placeholder to match the moving item.
 					height = transport.outerHeight();
 					// If there are children, account for distance between top of children and parent.
 					height += ( height > 0 ) ? (ui.placeholder.css('margin-top').slice(0, -2) * 1) : 0;
 					height += ui.helper.outerHeight();
 					helperHeight = height;
 					height -= 2;                                              // Subtract 2 for borders.
 					ui.placeholder.height(height);
 
 					// Update the width of the placeholder to match the moving item.
 					maxChildDepth = originalDepth;
 					children.each(function(){
 						var depth = $(this).menuItemDepth();
 						maxChildDepth = (depth > maxChildDepth) ? depth : maxChildDepth;
 					});
 					width = ui.helper.find('.menu-item-handle').outerWidth(); // Get original width.
 					width += api.depthToPx(maxChildDepth - originalDepth);    // Account for children.
 					width -= 2;                                               // Subtract 2 for borders.
 					ui.placeholder.width(width);
 
 					// Update the list of menu items.
 					tempHolder = ui.placeholder.next( '.menu-item' );
 					tempHolder.css( 'margin-top', helperHeight + 'px' ); // Set the margin to absorb the placeholder.
 					ui.placeholder.detach();         // Detach or jQuery UI will think the placeholder is a menu item.
 					$(this).sortable( 'refresh' );   // The children aren't sortable. We should let jQuery UI know.
 					ui.item.after( ui.placeholder ); // Reattach the placeholder.
 					tempHolder.css('margin-top', 0); // Reset the margin.
 
 					// Now that the element is complete, we can update...
 					updateSharedVars(ui);
 				},
 				stop: function(e, ui) {
 					var children, subMenuTitle,
 						depthChange = currentDepth - originalDepth;
 
 					// Return child elements to the list.
 					children = transport.children().insertAfter(ui.item);
 
 					// Add "sub menu" description.
 					subMenuTitle = ui.item.find( '.item-title .is-submenu' );
 					if ( 0 < currentDepth )
 						subMenuTitle.show();
 					else
 						subMenuTitle.hide();
 
 					// Update depth classes.
 					if ( 0 !== depthChange ) {
 						ui.item.updateDepthClass( currentDepth );
 						children.shiftDepthClass( depthChange );
 						updateMenuMaxDepth( depthChange );
 					}
 					// Register a change.
 					api.registerChange();
 					// Update the item data.
 					ui.item.updateParentMenuItemDBId();
 
 					// Address sortable's incorrectly-calculated top in Opera.
 					ui.item[0].style.top = 0;
 
 					// Handle drop placement for rtl orientation.
 					if ( api.isRTL ) {
 						ui.item[0].style.left = 'auto';
 						ui.item[0].style.right = 0;
 					}
 
 					api.refreshKeyboardAccessibility();
 					api.refreshAdvancedAccessibility();
 				},
 				change: function(e, ui) {
 					// Make sure the placeholder is inside the menu.
 					// Otherwise fix it, or we're in trouble.
 					if( ! ui.placeholder.parent().hasClass('menu') )
 						(prev.length) ? prev.after( ui.placeholder ) : api.menuList.prepend( ui.placeholder );
 
 					updateSharedVars(ui);
 				},
 				sort: function(e, ui) {
 					var offset = ui.helper.offset(),
 						edge = api.isRTL ? offset.left + ui.helper.width() : offset.left,
 						depth = api.negateIfRTL * api.pxToDepth( edge - menuEdge );
 
 					/*
 					 * Check and correct if depth is not within range.
 					 * Also, if the dragged element is dragged upwards over an item,
 					 * shift the placeholder to a child position.
 					 */
 					if ( depth > maxDepth || offset.top < ( prevBottom - api.options.targetTolerance ) ) {
 						depth = maxDepth;
 					} else if ( depth < minDepth ) {
 						depth = minDepth;
 					}
 
 					if( depth != currentDepth )
 						updateCurrentDepth(ui, depth);
 
 					// If we overlap the next element, manually shift downwards.
 					if( nextThreshold && offset.top + helperHeight > nextThreshold ) {
 						next.after( ui.placeholder );
 						updateSharedVars( ui );
 						$( this ).sortable( 'refreshPositions' );
 					}
 				}
 			});
 
 			function updateSharedVars(ui) {
 				var depth;
 
 				prev = ui.placeholder.prev( '.menu-item' );
 				next = ui.placeholder.next( '.menu-item' );
 
 				// Make sure we don't select the moving item.
 				if( prev[0] == ui.item[0] ) prev = prev.prev( '.menu-item' );
 				if( next[0] == ui.item[0] ) next = next.next( '.menu-item' );
 
 				prevBottom = (prev.length) ? prev.offset().top + prev.height() : 0;
 				nextThreshold = (next.length) ? next.offset().top + next.height() / 3 : 0;
 				minDepth = (next.length) ? next.menuItemDepth() : 0;
 
 				if( prev.length )
 					maxDepth = ( (depth = prev.menuItemDepth() + 1) > api.options.globalMaxDepth ) ? api.options.globalMaxDepth : depth;
 				else
 					maxDepth = 0;
 			}
 
 			function updateCurrentDepth(ui, depth) {
 				ui.placeholder.updateDepthClass( depth, currentDepth );
 				currentDepth = depth;
 			}
 
 			function initialMenuMaxDepth() {
 				if( ! body[0].className ) return 0;
 				var match = body[0].className.match(/menu-max-depth-(\d+)/);
 				return match && match[1] ? parseInt( match[1], 10 ) : 0;
 			}
 
 			function updateMenuMaxDepth( depthChange ) {
 				var depth, newDepth = menuMaxDepth;
 				if ( depthChange === 0 ) {
 					return;
 				} else if ( depthChange > 0 ) {
 					depth = maxChildDepth + depthChange;
 					if( depth > menuMaxDepth )
 						newDepth = depth;
 				} else if ( depthChange < 0 && maxChildDepth == menuMaxDepth ) {
 					while( ! $('.menu-item-depth-' + newDepth, api.menuList).length && newDepth > 0 )
 						newDepth--;
 				}
 				// Update the depth class.
 				body.removeClass( 'menu-max-depth-' + menuMaxDepth ).addClass( 'menu-max-depth-' + newDepth );
 				menuMaxDepth = newDepth;
 			}
 		},
 
 		initManageLocations : function () {
 			$('#menu-locations-wrap form').on( 'submit', function(){
 				window.onbeforeunload = null;
 			});
 			$('.menu-location-menus select').on('change', function () {
 				var editLink = $(this).closest('tr').find('.locations-edit-menu-link');
 				if ($(this).find('option:selected').data('orig'))
 					editLink.show();
 				else
 					editLink.hide();
 			});
 		},
 
 		attachMenuEditListeners : function() {
 			var that = this;
 			$('#update-nav-menu').on('click', function(e) {
 				if ( e.target && e.target.className ) {
 					if ( -1 != e.target.className.indexOf('item-edit') ) {
 						return that.eventOnClickEditLink(e.target);
 					} else if ( -1 != e.target.className.indexOf('menu-save') ) {
 						return that.eventOnClickMenuSave(e.target);
 					} else if ( -1 != e.target.className.indexOf('menu-delete') ) {
 						return that.eventOnClickMenuDelete(e.target);
 					} else if ( -1 != e.target.className.indexOf('item-delete') ) {
 						return that.eventOnClickMenuItemDelete(e.target);
 					} else if ( -1 != e.target.className.indexOf('item-cancel') ) {
 						return that.eventOnClickCancelLink(e.target);
 					}
 				}
 			});
 
 			$( '#menu-name' ).on( 'input', _.debounce( function () {
 				var menuName = $( document.getElementById( 'menu-name' ) ),
 					menuNameVal = menuName.val();
 
 				if ( ! menuNameVal || ! menuNameVal.replace( /\s+/, '' ) ) {
 					// Add warning for invalid menu name.
 					menuName.parent().addClass( 'form-invalid' );
 				} else {
 					// Remove warning for valid menu name.
 					menuName.parent().removeClass( 'form-invalid' );
 				}
 			}, 500 ) );
 
 			$('#add-custom-links input[type="text"]').on( 'keypress', function(e){
 				$('#customlinkdiv').removeClass('form-invalid');
 
 				if ( e.keyCode === 13 ) {
 					e.preventDefault();
 					$( '#submit-customlinkdiv' ).trigger( 'click' );
 				}
 			});
 		},
 
 		/**
 		 * Handle toggling bulk selection checkboxes for menu items.
 		 *
 		 * @since 5.8.0
 		 */ 
 		attachBulkSelectButtonListeners : function() {
 			var that = this;
 
 			$( '.bulk-select-switcher' ).on( 'change', function() {
 				if ( this.checked ) {
 					$( '.bulk-select-switcher' ).prop( 'checked', true );
 					that.enableBulkSelection();
 				} else {
 					$( '.bulk-select-switcher' ).prop( 'checked', false );
 					that.disableBulkSelection();
 				}
 			});
 		},
 
 		/**
 		 * Enable bulk selection checkboxes for menu items.
 		 *
 		 * @since 5.8.0
 		 */ 
 		enableBulkSelection : function() {
 			var checkbox = $( '#menu-to-edit .menu-item-checkbox' );
 
 			$( '#menu-to-edit' ).addClass( 'bulk-selection' );
 			$( '#nav-menu-bulk-actions-top' ).addClass( 'bulk-selection' );
 			$( '#nav-menu-bulk-actions-bottom' ).addClass( 'bulk-selection' );
 
 			$.each( checkbox, function() {
 				$(this).prop( 'disabled', false );
 			});
 		},
 
 		/**
 		 * Disable bulk selection checkboxes for menu items.
 		 *
 		 * @since 5.8.0
 		 */ 
 		disableBulkSelection : function() {
 			var checkbox = $( '#menu-to-edit .menu-item-checkbox' );
 
 			$( '#menu-to-edit' ).removeClass( 'bulk-selection' );
 			$( '#nav-menu-bulk-actions-top' ).removeClass( 'bulk-selection' );
 			$( '#nav-menu-bulk-actions-bottom' ).removeClass( 'bulk-selection' );
 
 			if ( $( '.menu-items-delete' ).is( '[aria-describedby="pending-menu-items-to-delete"]' ) ) {
 				$( '.menu-items-delete' ).removeAttr( 'aria-describedby' );
 			}
 
 			$.each( checkbox, function() {
 				$(this).prop( 'disabled', true ).prop( 'checked', false );
 			});
 
 			$( '.menu-items-delete' ).addClass( 'disabled' );
 			$( '#pending-menu-items-to-delete ul' ).empty();
 		},
 
 		/**
 		 * Listen for state changes on bulk action checkboxes.
 		 *
 		 * @since 5.8.0
 		 */ 
 		attachMenuCheckBoxListeners : function() {
 			var that = this;
 
 			$( '#menu-to-edit' ).on( 'change', '.menu-item-checkbox', function() {
 				that.setRemoveSelectedButtonStatus();
 			});
 		},
 
 		/**
 		 * Create delete button to remove menu items from collection.
 		 *
 		 * @since 5.8.0
 		 */ 
 		attachMenuItemDeleteButton : function() {
 			var that = this;
 
 			$( document ).on( 'click', '.menu-items-delete', function( e ) {
 				var itemsPendingDeletion, itemsPendingDeletionList, deletionSpeech;
 
 				e.preventDefault();
 
 				if ( ! $(this).hasClass( 'disabled' ) ) {
 					$.each( $( '.menu-item-checkbox:checked' ), function( index, element ) {
 						$( element ).parents( 'li' ).find( 'a.item-delete' ).trigger( 'click' );
 					});
 
 					$( '.menu-items-delete' ).addClass( 'disabled' );
 					$( '.bulk-select-switcher' ).prop( 'checked', false );
 
 					itemsPendingDeletion     = '';
 					itemsPendingDeletionList = $( '#pending-menu-items-to-delete ul li' );
 
 					$.each( itemsPendingDeletionList, function( index, element ) {
 						var itemName = $( element ).find( '.pending-menu-item-name' ).text();
 						var itemSpeech = menus.menuItemDeletion.replace( '%s', itemName );
 
 						itemsPendingDeletion += itemSpeech;
 						if ( ( index + 1 ) < itemsPendingDeletionList.length ) {
 							itemsPendingDeletion += ', ';
 						}
 					});
 
 					deletionSpeech = menus.itemsDeleted.replace( '%s', itemsPendingDeletion );
 					wp.a11y.speak( deletionSpeech, 'polite' );
 					that.disableBulkSelection();
 				}
 			});
 		},
 
 		/**
 		 * List menu items awaiting deletion.
 		 *
 		 * @since 5.8.0
 		 */ 
 		attachPendingMenuItemsListForDeletion : function() {
 			$( '#post-body-content' ).on( 'change', '.menu-item-checkbox', function() {
 				var menuItemName, menuItemType, menuItemID, listedMenuItem;
 
 				if ( ! $( '.menu-items-delete' ).is( '[aria-describedby="pending-menu-items-to-delete"]' ) ) {
 					$( '.menu-items-delete' ).attr( 'aria-describedby', 'pending-menu-items-to-delete' );
 				}
 
 				menuItemName = $(this).next().text();
 				menuItemType = $(this).parent().next( '.item-controls' ).find( '.item-type' ).text();
 				menuItemID   = $(this).attr( 'data-menu-item-id' );
 
 				listedMenuItem = $( '#pending-menu-items-to-delete ul' ).find( '[data-menu-item-id=' + menuItemID + ']' );
 				if ( listedMenuItem.length > 0 ) {
 					listedMenuItem.remove();
 				}
 
 				if ( this.checked === true ) {
 					$( '#pending-menu-items-to-delete ul' ).append(
 						'<li data-menu-item-id="' + menuItemID + '">' +
 							'<span class="pending-menu-item-name">' + menuItemName + '</span> ' +
 							'<span class="pending-menu-item-type">(' + menuItemType + ')</span>' +
 							'<span class="separator"></span>' +
 						'</li>'
 					);
 				}
 
 				$( '#pending-menu-items-to-delete li .separator' ).html( ', ' );
 				$( '#pending-menu-items-to-delete li .separator' ).last().html( '.' );
 			});
 		},
 
 		/**
 		 * Set status of bulk delete checkbox.
 		 *
 		 * @since 5.8.0
 		 */ 
 		setBulkDeleteCheckboxStatus : function() {
 			var that = this;
 			var checkbox = $( '#menu-to-edit .menu-item-checkbox' );
 
 			$.each( checkbox, function() {
 				if ( $(this).prop( 'disabled' ) ) {
 					$(this).prop( 'disabled', false );
 				} else {
 					$(this).prop( 'disabled', true );
 				}
 
 				if ( $(this).is( ':checked' ) ) {
 					$(this).prop( 'checked', false );
 				}
 			});
 
 			that.setRemoveSelectedButtonStatus();
 		},
 
 		/**
 		 * Set status of menu items removal button.
 		 *
 		 * @since 5.8.0
 		 */ 
 		setRemoveSelectedButtonStatus : function() {
 			var button = $( '.menu-items-delete' );
 
 			if ( $( '.menu-item-checkbox:checked' ).length > 0 ) {
 				button.removeClass( 'disabled' );
 			} else {
 				button.addClass( 'disabled' );
 			}
 		},
 
 		attachMenuSaveSubmitListeners : function() {
 			/*
 			 * When a navigation menu is saved, store a JSON representation of all form data
 			 * in a single input to avoid PHP `max_input_vars` limitations. See #14134.
 			 */
 			$( '#update-nav-menu' ).on( 'submit', function() {
 				var navMenuData = $( '#update-nav-menu' ).serializeArray();
 				$( '[name="nav-menu-data"]' ).val( JSON.stringify( navMenuData ) );
 			});
 		},
 
 		attachThemeLocationsListeners : function() {
 			var loc = $('#nav-menu-theme-locations'), params = {};
 			params.action = 'menu-locations-save';
 			params['menu-settings-column-nonce'] = $('#menu-settings-column-nonce').val();
 			loc.find('input[type="submit"]').on( 'click', function() {
 				loc.find('select').each(function() {
 					params[this.name] = $(this).val();
 				});
 				loc.find( '.spinner' ).addClass( 'is-active' );
 				$.post( ajaxurl, params, function() {
 					loc.find( '.spinner' ).removeClass( 'is-active' );
 				});
 				return false;
 			});
 		},
 
 		attachQuickSearchListeners : function() {
 			var searchTimer;
 
 			// Prevent form submission.
 			$( '#nav-menu-meta' ).on( 'submit', function( event ) {
 				event.preventDefault();
 			});
 
 			$( '#nav-menu-meta' ).on( 'input', '.quick-search', function() {
 				var $this = $( this );
 
 				$this.attr( 'autocomplete', 'off' );
 
 				if ( searchTimer ) {
 					clearTimeout( searchTimer );
 				}
 
 				searchTimer = setTimeout( function() {
 					api.updateQuickSearchResults( $this );
 				}, 500 );
 			}).on( 'blur', '.quick-search', function() {
 				api.lastSearch = '';
 			});
 		},
 
 		updateQuickSearchResults : function(input) {
 			var panel, params,
 				minSearchLength = 2,
 				q = input.val();
 
 			/*
 			 * Minimum characters for a search. Also avoid a new Ajax search when
 			 * the pressed key (e.g. arrows) doesn't change the searched term.
 			 */
 			if ( q.length < minSearchLength || api.lastSearch == q ) {
 				return;
 			}
 
 			api.lastSearch = q;
 
 			panel = input.parents('.tabs-panel');
 			params = {
 				'action': 'menu-quick-search',
 				'response-format': 'markup',
 				'menu': $('#menu').val(),
 				'menu-settings-column-nonce': $('#menu-settings-column-nonce').val(),
 				'q': q,
 				'type': input.attr('name')
 			};
 
 			$( '.spinner', panel ).addClass( 'is-active' );
 
 			$.post( ajaxurl, params, function(menuMarkup) {
 				api.processQuickSearchQueryResponse(menuMarkup, params, panel);
 			});
 		},
 
 		addCustomLink : function( processMethod ) {
 			var url = $('#custom-menu-item-url').val().toString(),
 				label = $('#custom-menu-item-name').val();
 
 			if ( '' !== url ) {
 				url = url.trim();
 			}
 
 			processMethod = processMethod || api.addMenuItemToBottom;
 
 			if ( '' === url || 'https://' == url || 'http://' == url ) {
 				$('#customlinkdiv').addClass('form-invalid');
 				return false;
 			}
 
 			// Show the Ajax spinner.
 			$( '.customlinkdiv .spinner' ).addClass( 'is-active' );
 			this.addLinkToMenu( url, label, processMethod, function() {
 				// Remove the Ajax spinner.
 				$( '.customlinkdiv .spinner' ).removeClass( 'is-active' );
 				// Set custom link form back to defaults.
 				$('#custom-menu-item-name').val('').trigger( 'blur' );
 				$( '#custom-menu-item-url' ).val( '' ).attr( 'placeholder', 'https://' );
 			});
 		},
 
 		addLinkToMenu : function(url, label, processMethod, callback) {
 			processMethod = processMethod || api.addMenuItemToBottom;
 			callback = callback || function(){};
 
 			api.addItemToMenu({
 				'-1': {
 					'menu-item-type': 'custom',
 					'menu-item-url': url,
 					'menu-item-title': label
 				}
 			}, processMethod, callback);
 		},
 
 		addItemToMenu : function(menuItem, processMethod, callback) {
 			var menu = $('#menu').val(),
 				nonce = $('#menu-settings-column-nonce').val(),
 				params;
 
 			processMethod = processMethod || function(){};
 			callback = callback || function(){};
 
 			params = {
 				'action': 'add-menu-item',
 				'menu': menu,
 				'menu-settings-column-nonce': nonce,
 				'menu-item': menuItem
 			};
 
 			$.post( ajaxurl, params, function(menuMarkup) {
 				var ins = $('#menu-instructions');
 
 				menuMarkup = menuMarkup || '';
 				menuMarkup = menuMarkup.toString().trim(); // Trim leading whitespaces.
 				processMethod(menuMarkup, params);
 
 				// Make it stand out a bit more visually, by adding a fadeIn.
 				$( 'li.pending' ).hide().fadeIn('slow');
 				$( '.drag-instructions' ).show();
 				if( ! ins.hasClass( 'menu-instructions-inactive' ) && ins.siblings().length )
 					ins.addClass( 'menu-instructions-inactive' );
 
 				callback();
 			});
 		},
 
 		/**
 		 * Process the add menu item request response into menu list item. Appends to menu.
 		 *
 		 * @param {string} menuMarkup The text server response of menu item markup.
 		 *
 		 * @fires document#menu-item-added Passes menuMarkup as a jQuery object.
 		 */
 		addMenuItemToBottom : function( menuMarkup ) {
 			var $menuMarkup = $( menuMarkup );
 			$menuMarkup.hideAdvancedMenuItemFields().appendTo( api.targetList );
 			api.refreshKeyboardAccessibility();
 			api.refreshAdvancedAccessibility();
 			$( document ).trigger( 'menu-item-added', [ $menuMarkup ] );
 		},
 
 		/**
 		 * Process the add menu item request response into menu list item. Prepends to menu.
 		 *
 		 * @param {string} menuMarkup The text server response of menu item markup.
 		 *
 		 * @fires document#menu-item-added Passes menuMarkup as a jQuery object.
 		 */
 		addMenuItemToTop : function( menuMarkup ) {
 			var $menuMarkup = $( menuMarkup );
 			$menuMarkup.hideAdvancedMenuItemFields().prependTo( api.targetList );
 			api.refreshKeyboardAccessibility();
 			api.refreshAdvancedAccessibility();
 			$( document ).trigger( 'menu-item-added', [ $menuMarkup ] );
 		},
 
 		attachUnsavedChangesListener : function() {
 			$('#menu-management input, #menu-management select, #menu-management, #menu-management textarea, .menu-location-menus select').on( 'change', function(){
 				api.registerChange();
 			});
 
 			if ( 0 !== $('#menu-to-edit').length || 0 !== $('.menu-location-menus select').length ) {
 				window.onbeforeunload = function(){
 					if ( api.menusChanged )
 						return wp.i18n.__( 'The changes you made will be lost if you navigate away from this page.' );
 				};
 			} else {
 				// Make the post boxes read-only, as they can't be used yet.
 				$( '#menu-settings-column' ).find( 'input,select' ).end().find( 'a' ).attr( 'href', '#' ).off( 'click' );
 			}
 		},
 
 		registerChange : function() {
 			api.menusChanged = true;
 		},
 
 		attachTabsPanelListeners : function() {
 			$('#menu-settings-column').on('click', function(e) {
 				var selectAreaMatch, selectAll, panelId, wrapper, items,
 					target = $(e.target);
 
 				if ( target.hasClass('nav-tab-link') ) {
 
 					panelId = target.data( 'type' );
 
 					wrapper = target.parents('.accordion-section-content').first();
 
 					// Upon changing tabs, we want to uncheck all checkboxes.
 					$( 'input', wrapper ).prop( 'checked', false );
 
 					$('.tabs-panel-active', wrapper).removeClass('tabs-panel-active').addClass('tabs-panel-inactive');
 					$('#' + panelId, wrapper).removeClass('tabs-panel-inactive').addClass('tabs-panel-active');
 
 					$('.tabs', wrapper).removeClass('tabs');
 					target.parent().addClass('tabs');
 
 					// Select the search bar.
 					$('.quick-search', wrapper).trigger( 'focus' );
 
 					// Hide controls in the search tab if no items found.
 					if ( ! wrapper.find( '.tabs-panel-active .menu-item-title' ).length ) {
 						wrapper.addClass( 'has-no-menu-item' );
 					} else {
 						wrapper.removeClass( 'has-no-menu-item' );
 					}
 
 					e.preventDefault();
 				} else if ( target.hasClass( 'select-all' ) ) {
 					selectAreaMatch = target.closest( '.button-controls' ).data( 'items-type' );
 					if ( selectAreaMatch ) {
 						items = $( '#' + selectAreaMatch + ' .tabs-panel-active .menu-item-title input' );
 
 						if ( items.length === items.filter( ':checked' ).length && ! target.is( ':checked' ) ) {
 							items.prop( 'checked', false );
 						} else if ( target.is( ':checked' ) ) {
 							items.prop( 'checked', true );
 						}
 					}
 				} else if ( target.hasClass( 'menu-item-checkbox' ) ) {
 					selectAreaMatch = target.closest( '.tabs-panel-active' ).parent().attr( 'id' );
 					if ( selectAreaMatch ) {
 						items     = $( '#' + selectAreaMatch + ' .tabs-panel-active .menu-item-title input' );
 						selectAll = $( '.button-controls[data-items-type="' + selectAreaMatch + '"] .select-all' );
 
 						if ( items.length === items.filter( ':checked' ).length && ! selectAll.is( ':checked' ) ) {
 							selectAll.prop( 'checked', true );
 						} else if ( selectAll.is( ':checked' ) ) {
 							selectAll.prop( 'checked', false );
 						}
 					}
 				} else if ( target.hasClass('submit-add-to-menu') ) {
 					api.registerChange();
 
 					if ( e.target.id && 'submit-customlinkdiv' == e.target.id )
 						api.addCustomLink( api.addMenuItemToBottom );
 					else if ( e.target.id && -1 != e.target.id.indexOf('submit-') )
 						$('#' + e.target.id.replace(/submit-/, '')).addSelectedToMenu( api.addMenuItemToBottom );
 					return false;
 				}
 			});
 
 			/*
 			 * Delegate the `click` event and attach it just to the pagination
 			 * links thus excluding the current page `<span>`. See ticket #35577.
 			 */
 			$( '#nav-menu-meta' ).on( 'click', 'a.page-numbers', function() {
 				var $container = $( this ).closest( '.inside' );
 
 				$.post( ajaxurl, this.href.replace( /.*\?/, '' ).replace( /action=([^&]*)/, '' ) + '&action=menu-get-metabox',
 					function( resp ) {
 						var metaBoxData = JSON.parse( resp ),
 							toReplace;
 
 						if ( -1 === resp.indexOf( 'replace-id' ) ) {
 							return;
 						}
 
 						// Get the post type menu meta box to update.
 						toReplace = document.getElementById( metaBoxData['replace-id'] );
 
 						if ( ! metaBoxData.markup || ! toReplace ) {
 							return;
 						}
 
 						// Update the post type menu meta box with new content from the response.
 						$container.html( metaBoxData.markup );
 					}
 				);
 
 				return false;
 			});
 		},
 
 		eventOnClickEditLink : function(clickedEl) {
 			var settings, item,
 			matchedSection = /#(.*)$/.exec(clickedEl.href);
 
 			if ( matchedSection && matchedSection[1] ) {
 				settings = $('#'+matchedSection[1]);
 				item = settings.parent();
 				if( 0 !== item.length ) {
 					if( item.hasClass('menu-item-edit-inactive') ) {
 						if( ! settings.data('menu-item-data') ) {
 							settings.data( 'menu-item-data', settings.getItemData() );
 						}
 						settings.slideDown('fast');
 						item.removeClass('menu-item-edit-inactive')
 							.addClass('menu-item-edit-active');
 					} else {
 						settings.slideUp('fast');
 						item.removeClass('menu-item-edit-active')
 							.addClass('menu-item-edit-inactive');
 					}
 					return false;
 				}
 			}
 		},
 
 		eventOnClickCancelLink : function(clickedEl) {
 			var settings = $( clickedEl ).closest( '.menu-item-settings' ),
 				thisMenuItem = $( clickedEl ).closest( '.menu-item' );
 
 			thisMenuItem.removeClass( 'menu-item-edit-active' ).addClass( 'menu-item-edit-inactive' );
 			settings.setItemData( settings.data( 'menu-item-data' ) ).hide();
 			// Restore the title of the currently active/expanded menu item.
 			thisMenuItem.find( '.menu-item-title' ).text( settings.data( 'menu-item-data' )['menu-item-title'] );
 
 			return false;
 		},
 
 		eventOnClickMenuSave : function() {
 			var locs = '',
 			menuName = $('#menu-name'),
 			menuNameVal = menuName.val();
 
 			// Cancel and warn if invalid menu name.
 			if ( ! menuNameVal || ! menuNameVal.replace( /\s+/, '' ) ) {
 				menuName.parent().addClass( 'form-invalid' );
 				return false;
 			}
 			// Copy menu theme locations.
 			$('#nav-menu-theme-locations select').each(function() {
 				locs += '<input type="hidden" name="' + this.name + '" value="' + $(this).val() + '" />';
 			});
 			$('#update-nav-menu').append( locs );
 			// Update menu item position data.
 			api.menuList.find('.menu-item-data-position').val( function(index) { return index + 1; } );
 			window.onbeforeunload = null;
 
 			return true;
 		},
 
 		eventOnClickMenuDelete : function() {
 			// Delete warning AYS.
 			if ( window.confirm( wp.i18n.__( 'You are about to permanently delete this menu.\n\'Cancel\' to stop, \'OK\' to delete.' ) ) ) {
 				window.onbeforeunload = null;
 				return true;
 			}
 			return false;
 		},
 
 		eventOnClickMenuItemDelete : function(clickedEl) {
 			var itemID = parseInt(clickedEl.id.replace('delete-', ''), 10);
 
 			api.removeMenuItem( $('#menu-item-' + itemID) );
 			api.registerChange();
 			return false;
 		},
 
 		/**
 		 * Process the quick search response into a search result
 		 *
 		 * @param string resp The server response to the query.
 		 * @param object req The request arguments.
 		 * @param jQuery panel The tabs panel we're searching in.
 		 */
 		processQuickSearchQueryResponse : function(resp, req, panel) {
 			var matched, newID,
 			takenIDs = {},
 			form = document.getElementById('nav-menu-meta'),
 			pattern = /menu-item[(\[^]\]*/,
 			$items = $('<div>').html(resp).find('li'),
 			wrapper = panel.closest( '.accordion-section-content' ),
 			selectAll = wrapper.find( '.button-controls .select-all' ),
 			$item;
 
 			if( ! $items.length ) {
 				$('.categorychecklist', panel).html( '<li><p>' + wp.i18n.__( 'No results found.' ) + '</p></li>' );
 				$( '.spinner', panel ).removeClass( 'is-active' );
 				wrapper.addClass( 'has-no-menu-item' );
 				return;
 			}
 
 			$items.each(function(){
 				$item = $(this);
 
 				// Make a unique DB ID number.
 				matched = pattern.exec($item.html());
 
 				if ( matched && matched[1] ) {
 					newID = matched[1];
 					while( form.elements['menu-item[' + newID + '][menu-item-type]'] || takenIDs[ newID ] ) {
 						newID--;
 					}
 
 					takenIDs[newID] = true;
 					if ( newID != matched[1] ) {
 						$item.html( $item.html().replace(new RegExp(
 							'menu-item\\[' + matched[1] + '\\]', 'g'),
 							'menu-item[' + newID + ']'
 						) );
 					}
 				}
 			});
 
 			$('.categorychecklist', panel).html( $items );
 			$( '.spinner', panel ).removeClass( 'is-active' );
 			wrapper.removeClass( 'has-no-menu-item' );
 
 			if ( selectAll.is( ':checked' ) ) {
 				selectAll.prop( 'checked', false );
 			}
 		},
 
 		/**
 		 * Remove a menu item.
 		 *
 		 * @param {Object} el The element to be removed as a jQuery object.
 		 *
 		 * @fires document#menu-removing-item Passes the element to be removed.
 		 */
 		removeMenuItem : function(el) {
 			var children = el.childMenuItems();
 
 			$( document ).trigger( 'menu-removing-item', [ el ] );
 			el.addClass('deleting').animate({
 					opacity : 0,
 					height: 0
 				}, 350, function() {
 					var ins = $('#menu-instructions');
 					el.remove();
 					children.shiftDepthClass( -1 ).updateParentMenuItemDBId();
 					if ( 0 === $( '#menu-to-edit li' ).length ) {
 						$( '.drag-instructions' ).hide();
 						ins.removeClass( 'menu-instructions-inactive' );
 					}
 					api.refreshAdvancedAccessibility();
 				});
 		},
 
 		depthToPx : function(depth) {
 			return depth * api.options.menuItemDepthPerLevel;
 		},
 
 		pxToDepth : function(px) {
 			return Math.floor(px / api.options.menuItemDepthPerLevel);
 		}
 
 	};
 
 	$( function() {
 
 		wpNavMenu.init();
 
 		// Prevent focused element from being hidden by the sticky footer.
 		$( '.menu-edit a, .menu-edit button, .menu-edit input, .menu-edit textarea, .menu-edit select' ).on('focus', function() {
 			if ( window.innerWidth >= 783 ) {
 				var navMenuHeight = $( '#nav-menu-footer' ).height() + 20;
 				var bottomOffset = $(this).offset().top - ( $(window).scrollTop() + $(window).height() - $(this).height() );
 
 				if ( bottomOffset > 0 ) {
 					bottomOffset = 0;
 				}
 				bottomOffset = bottomOffset * -1;
 
 				if( bottomOffset < navMenuHeight ) {
 					var scrollTop = $(document).scrollTop();
 					$(document).scrollTop( scrollTop + ( navMenuHeight - bottomOffset ) );
 				}
 			}
 		});
 	});
 
 })(jQuery);