/**
* @output wp-admin/js/customize-nav-menus.js
*/

/* global menus, _wpCustomizeNavMenusSettings, wpNavMenu, console */
( function( api, wp, $ ) {
'use strict';

/**
* Set up wpNavMenu for drag and drop.
*/
wpNavMenu.originalInit = wpNavMenu.init;
wpNavMenu.options.menuItemDepthPerLevel = 20;
wpNavMenu.options.sortableItems = '> .customize-control-nav_menu_item';
wpNavMenu.options.targetTolerance = 10;
wpNavMenu.init = function() {
this.jQueryExtensions();
};

/**
* @namespace wp.customize.Menus
*/
api.Menus = api.Menus || {};

// Link settings.
api.Menus.data = {
itemTypes: [],
l10n: {},
settingTransport: 'refresh',
phpIntMax: 0,
defaultSettingValues: {
nav_menu: {},
nav_menu_item: {}
},
locationSlugMappedToName: {}
};
if ( 'undefined' !== typeof _wpCustomizeNavMenusSettings ) {
$.extend( api.Menus.data, _wpCustomizeNavMenusSettings );
}

/**
* Newly-created Nav Menus and Nav Menu Items have negative integer IDs which
* serve as placeholders until Save & Publish happens.
*
* @alias wp.customize.Menus.generatePlaceholderAutoIncrementId
*
* @return {number}
*/
api.Menus.generatePlaceholderAutoIncrementId = function() {
return -Math.ceil( api.Menus.data.phpIntMax * Math.random() );
};

/**
* wp.customize.Menus.AvailableItemModel
*
* A single available menu item model. See PHP's WP_Customize_Nav_Menu_Item_Setting class.
*
* @class wp.customize.Menus.AvailableItemModel
* @augments Backbone.Model
*/
api.Menus.AvailableItemModel = Backbone.Model.extend( $.extend(
{
id: null // This is only used by Backbone.
},
api.Menus.data.defaultSettingValues.nav_menu_item
) );

/**
* wp.customize.Menus.AvailableItemCollection
*
* Collection for available menu item models.
*
* @class wp.customize.Menus.AvailableItemCollection
* @augments Backbone.Collection
*/
api.Menus.AvailableItemCollection = Backbone.Collection.extend(/** @lends wp.customize.Menus.AvailableItemCollection.prototype */{
model: api.Menus.AvailableItemModel,

sort_key: 'order',

comparator: function( item ) {
return -item.get( this.sort_key );
},

sortByField: function( fieldName ) {
this.sort_key = fieldName;
this.sort();
}
});
api.Menus.availableMenuItems = new api.Menus.AvailableItemCollection( api.Menus.data.availableMenuItems );

/**
* Insert a new `auto-draft` post.
*
* @since 4.7.0
* @alias wp.customize.Menus.insertAutoDraftPost
*
* @param {Object} params - Parameters for the draft post to create.
* @param {string} params.post_type - Post type to add.
* @param {string} params.post_title - Post title to use.
* @return {jQuery.promise} Promise resolved with the added post.
*/
api.Menus.insertAutoDraftPost = function insertAutoDraftPost( params ) {
var request, deferred = $.Deferred();

request = wp.ajax.post( 'customize-nav-menus-insert-auto-draft', {
'customize-menus-nonce': api.settings.nonce['customize-menus'],
'wp_customize': 'on',
'customize_changeset_uuid': api.settings.changeset.uuid,
'params': params
} );

request.done( function( response ) {
if ( response.post_id ) {
api( 'nav_menus_created_posts' ).set(
api( 'nav_menus_created_posts' ).get().concat( [ response.post_id ] )
);

if ( 'page' === params.post_type ) {

// Activate static front page controls as this could be the first page created.
if ( api.section.has( 'static_front_page' ) ) {
api.section( 'static_front_page' ).activate();
}

// Add new page to dropdown-pages controls.
api.control.each( function( control ) {
var select;
if ( 'dropdown-pages' === control.params.type ) {
select = control.container.find( 'select[name^="_customize-dropdown-pages-"]' );
select.append( new Option( params.post_title, response.post_id ) );
}
} );
}
deferred.resolve( response );
}
} );

request.fail( function( response ) {
var error = response || '';

if ( 'undefined' !== typeof response.message ) {
error = response.message;
}

console.error( error );
deferred.rejectWith( error );
} );

return deferred.promise();
};

api.Menus.AvailableMenuItemsPanelView = wp.Backbone.View.extend(/** @lends wp.customize.Menus.AvailableMenuItemsPanelView.prototype */{

el: '#available-menu-items',

events: {
'input #menu-items-search': 'debounceSearch',
'focus .menu-item-tpl': 'focus',
'click .menu-item-tpl': '_submit',
'click #custom-menu-item-submit': '_submitLink',
'keypress #custom-menu-item-name': '_submitLink',
'click .new-content-item .add-content': '_submitNew',
'keypress .create-item-input': '_submitNew',
'keydown': 'keyboardAccessible'
},

// Cache current selected menu item.
selected: null,

// Cache menu control that opened the panel.
currentMenuControl: null,
debounceSearch: null,
$search: null,
$clearResults: null,
searchTerm: '',
rendered: false,
pages: {},
sectionContent: '',
loading: false,
addingNew: false,

/**
* wp.customize.Menus.AvailableMenuItemsPanelView
*
* View class for the available menu items panel.
*
* @constructs wp.customize.Menus.AvailableMenuItemsPanelView
* @augments wp.Backbone.View
*/
initialize: function() {
var self = this;

if ( ! api.panel.has( 'nav_menus' ) ) {
return;
}

this.$search = $( '#menu-items-search' );
this.$clearResults = this.$el.find( '.clear-results' );
this.sectionContent = this.$el.find( '.available-menu-items-list' );

this.debounceSearch = _.debounce( self.search, 500 );

_.bindAll( this, 'close' );

/*
* If the available menu items panel is open and the customize controls
* are interacted with (other than an item being deleted), then close
* the available menu items panel. Also close on back button click.
*/
$( '#customize-controls, .customize-section-back' ).on( 'click keydown', function( e ) {
var isDeleteBtn = $( e.target ).is( '.item-delete, .item-delete *' ),
isAddNewBtn = $( e.target ).is( '.add-new-menu-item, .add-new-menu-item *' );
if ( $( 'body' ).hasClass( 'adding-menu-items' ) && ! isDeleteBtn && ! isAddNewBtn ) {
self.close();
}
} );

// Clear the search results and trigger an `input` event to fire a new search.
this.$clearResults.on( 'click', function() {
self.$search.val( '' ).trigger( 'focus' ).trigger( 'input' );
} );

this.$el.on( 'input', '#custom-menu-item-name.invalid, #custom-menu-item-url.invalid', function() {
$( this ).removeClass( 'invalid' );
var errorMessageId = $( this ).attr( 'aria-describedby' );
$( '#' + errorMessageId ).hide();
$( this ).removeAttr( 'aria-invalid' ).removeAttr( 'aria-describedby' );
});

// Load available items if it looks like we'll need them.
api.panel( 'nav_menus' ).container.on( 'expanded', function() {
if ( ! self.rendered ) {
self.initList();
self.rendered = true;
}
});

// Load more items.
this.sectionContent.on( 'scroll', function() {
var totalHeight = self.$el.find( '.accordion-section.open .available-menu-items-list' ).prop( 'scrollHeight' ),
visibleHeight = self.$el.find( '.accordion-section.open' ).height();

if ( ! self.loading && $( this ).scrollTop() > 3 / 4 * totalHeight - visibleHeight ) {
var type = $( this ).data( 'type' ),
object = $( this ).data( 'object' );

if ( 'search' === type ) {
if ( self.searchTerm ) {
self.doSearch( self.pages.search );
}
} else {
self.loadItems( [
{ type: type, object: object }
] );
}
}
});

// Close the panel if the URL in the preview changes.
api.previewer.bind( 'url', this.close );

self.delegateEvents();
},

// Search input change handler.
search: function( event ) {
var $searchSection = $( '#available-menu-items-search' ),
$otherSections = $( '#available-menu-items .accordion-section' ).not( $searchSection );

if ( ! event ) {
return;
}

if ( this.searchTerm === event.target.value ) {
return;
}

if ( '' !== event.target.value && ! $searchSection.hasClass( 'open' ) ) {
$otherSections.fadeOut( 100 );
$searchSection.find( '.accordion-section-content' ).slideDown( 'fast' );
$searchSection.addClass( 'open' );
this.$clearResults.addClass( 'is-visible' );
} else if ( '' === event.target.value ) {
$searchSection.removeClass( 'open' );
$otherSections.show();
this.$clearResults.removeClass( 'is-visible' );
}

this.searchTerm = event.target.value;
this.pages.search = 1;
this.doSearch( 1 );
},

// Get search results.
doSearch: function( page ) {
var self = this, params,
$section = $( '#available-menu-items-search' ),
$content = $section.find( '.accordion-section-content' ),
itemTemplate = wp.template( 'available-menu-item' );

if ( self.currentRequest ) {
self.currentRequest.abort();
}

if ( page < 0 ) {
return;
} else if ( page > 1 ) {
$section.addClass( 'loading-more' );
$content.attr( 'aria-busy', 'true' );
wp.a11y.speak( api.Menus.data.l10n.itemsLoadingMore );
} else if ( '' === self.searchTerm ) {
$content.html( '' );
wp.a11y.speak( '' );
return;
}

$section.addClass( 'loading' );
self.loading = true;

params = api.previewer.query( { excludeCustomizedSaved: true } );
_.extend( params, {
'customize-menus-nonce': api.settings.nonce['customize-menus'],
'wp_customize': 'on',
'search': self.searchTerm,
'page': page
} );

self.currentRequest = wp.ajax.post( 'search-available-menu-items-customizer', params );

self.currentRequest.done(function( data ) {
var items;
if ( 1 === page ) {
// Clear previous results as it's a new search.
$content.empty();
}
$section.removeClass( 'loading loading-more' );
$content.attr( 'aria-busy', 'false' );
$section.addClass( 'open' );
self.loading = false;
items = new api.Menus.AvailableItemCollection( data.items );
self.collection.add( items.models );
items.each( function( menuItem ) {
$content.append( itemTemplate( menuItem.attributes ) );
} );
if ( 20 > items.length ) {
self.pages.search = -1; // Up to 20 posts and 20 terms in results, if <20, no more results for either.
} else {
self.pages.search = self.pages.search + 1;
}
if ( items && page > 1 ) {
wp.a11y.speak( api.Menus.data.l10n.itemsFoundMore.replace( '%d', items.length ) );
} else if ( items && page === 1 ) {
wp.a11y.speak( api.Menus.data.l10n.itemsFound.replace( '%d', items.length ) );
}
});

self.currentRequest.fail(function( data ) {
// data.message may be undefined, for example when typing slow and the request is aborted.
if ( data.message ) {
$content.empty().append( $( '<li class="nothing-found"></li>' ).text( data.message ) );
wp.a11y.speak( data.message );
}
self.pages.search = -1;
});

self.currentRequest.always(function() {
$section.removeClass( 'loading loading-more' );
$content.attr( 'aria-busy', 'false' );
self.loading = false;
self.currentRequest = null;
});
},

// Render the individual items.
initList: function() {
var self = this;

// Render the template for each item by type.
_.each( api.Menus.data.itemTypes, function( itemType ) {
self.pages[ itemType.type + ':' + itemType.object ] = 0;
} );
self.loadItems( api.Menus.data.itemTypes );
},

/**
* Load available nav menu items.
*
* @since 4.3.0
* @since 4.7.0 Changed function signature to take list of item types instead of single type/object.
* @access private
*
* @param {Array.<Object>} itemTypes List of objects containing type and key.
* @param {string} deprecated Formerly the object parameter.
* @return {void}
*/
loadItems: function( itemTypes, deprecated ) {
var self = this, _itemTypes, requestItemTypes = [], params, request, itemTemplate, availableMenuItemContainers = {};
itemTemplate = wp.template( 'available-menu-item' );

if ( _.isString( itemTypes ) && _.isString( deprecated ) ) {
_itemTypes = [ { type: itemTypes, object: deprecated } ];
} else {
_itemTypes = itemTypes;
}

_.each( _itemTypes, function( itemType ) {
var container, name = itemType.type + ':' + itemType.object;
if ( -1 === self.pages[ name ] ) {
return; // Skip types for which there are no more results.
}
container = $( '#available-menu-items-' + itemType.type + '-' + itemType.object );
container.find( '.accordion-section-title' ).addClass( 'loading' );
availableMenuItemContainers[ name ] = container;

requestItemTypes.push( {
object: itemType.object,
type: itemType.type,
page: self.pages[ name ]
} );
} );

if ( 0 === requestItemTypes.length ) {
return;
}

self.loading = true;

params = api.previewer.query( { excludeCustomizedSaved: true } );
_.extend( params, {
'customize-menus-nonce': api.settings.nonce['customize-menus'],
'wp_customize': 'on',
'item_types': requestItemTypes
} );

request = wp.ajax.post( 'load-available-menu-items-customizer', params );

request.done(function( data ) {
var typeInner;
_.each( data.items, function( typeItems, name ) {
if ( 0 === typeItems.length ) {
if ( 0 === self.pages[ name ] ) {
availableMenuItemContainers[ name ].find( '.accordion-section-title' )
.addClass( 'cannot-expand' )
.removeClass( 'loading' )
.find( '.accordion-section-title > button' )
.prop( 'tabIndex', -1 );
}
self.pages[ name ] = -1;
return;
} else if ( ( 'post_type:page' === name ) && ( ! availableMenuItemContainers[ name ].hasClass( 'open' ) ) ) {
availableMenuItemContainers[ name ].find( '.accordion-section-title > button' ).trigger( 'click' );
}
typeItems = new api.Menus.AvailableItemCollection( typeItems ); // @todo Why is this collection created and then thrown away?
self.collection.add( typeItems.models );
typeInner = availableMenuItemContainers[ name ].find( '.available-menu-items-list' );
typeItems.each( function( menuItem ) {
typeInner.append( itemTemplate( menuItem.attributes ) );
} );
self.pages[ name ] += 1;
});
});
request.fail(function( data ) {
if ( typeof console !== 'undefined' && console.error ) {
console.error( data );
}
});
request.always(function() {
_.each( availableMenuItemContainers, function( container ) {
container.find( '.accordion-section-title' ).removeClass( 'loading' );
} );
self.loading = false;
});
},

// Adjust the height of each section of items to fit the screen.
itemSectionHeight: function() {
var sections, lists, totalHeight, accordionHeight, diff;
totalHeight = window.innerHeight;
sections = this.$el.find( '.accordion-section:not( #available-menu-items-search ) .accordion-section-content' );
lists = this.$el.find( '.accordion-section:not( #available-menu-items-search ) .available-menu-items-list:not(":only-child")' );
accordionHeight = 46 * ( 1 + sections.length ) + 14; // Magic numbers.
diff = totalHeight - accordionHeight;
if ( 120 < diff && 290 > diff ) {
sections.css( 'max-height', diff );
lists.css( 'max-height', ( diff - 60 ) );
}
},

// Highlights a menu item.
select: function( menuitemTpl ) {
this.selected = $( menuitemTpl );
this.selected.siblings( '.menu-item-tpl' ).removeClass( 'selected' );
this.selected.addClass( 'selected' );
},

// Highlights a menu item on focus.
focus: function( event ) {
this.select( $( event.currentTarget ) );
},

// Submit handler for keypress and click on menu item.
_submit: function( event ) {
// Only proceed with keypress if it is Enter or Spacebar.
if ( 'keypress' === event.type && ( 13 !== event.which && 32 !== event.which ) ) {
return;
}

this.submit( $( event.currentTarget ) );
},

// Adds a selected menu item to the menu.
submit: function( menuitemTpl ) {
var menuitemId, menu_item;

if ( ! menuitemTpl ) {
menuitemTpl = this.selected;
}

if ( ! menuitemTpl || ! this.currentMenuControl ) {
return;
}

this.select( menuitemTpl );

menuitemId = $( this.selected ).data( 'menu-item-id' );
menu_item = this.collection.findWhere( { id: menuitemId } );
if ( ! menu_item ) {
return;
}

this.currentMenuControl.addItemToMenu( menu_item.attributes );

$( menuitemTpl ).find( '.menu-item-handle' ).addClass( 'item-added' );
},

// Submit handler for keypress and click on custom menu item.
_submitLink: function( event ) {
// Only proceed with keypress if it is Enter.
if ( 'keypress' === event.type && 13 !== event.which ) {
return;
}

this.submitLink();
},

// Adds the custom menu item to the menu.
submitLink: function() {
var menuItem,
itemName = $( '#custom-menu-item-name' ),
itemUrl = $( '#custom-menu-item-url' ),
urlErrorMessage = $( '#custom-url-error' ),
nameErrorMessage = $( '#custom-name-error' ),
url = itemUrl.val().trim(),
urlRegex,
errorText;

if ( ! this.currentMenuControl ) {
return;
}

/*
* Allow URLs including:
* - http://example.com/
* - //example.com
* - /directory/
* - ?query-param
* - #target
* - mailto:foo@example.com
*
* Any further validation will be handled on the server when the setting is attempted to be saved,
* so this pattern does not need to be complete.
*/
urlRegex = /^((\w+:)?\/\/\w.*|\w+:(?!\/\/$)|\/|\?|#)/;
if ( ! urlRegex.test( url ) || '' === itemName.val() ) {
if ( ! urlRegex.test( url ) ) {
itemUrl.addClass( 'invalid' )
.attr( 'aria-invalid', 'true' )
.attr( 'aria-describedby', 'custom-url-error' );
urlErrorMessage.show();
errorText = urlErrorMessage.text();
// Announce error message via screen reader
wp.a11y.speak( errorText, 'assertive' );
}
if ( '' === itemName.val() ) {
itemName.addClass( 'invalid' )
.attr( 'aria-invalid', 'true' )
.attr( 'aria-describedby', 'custom-name-error' );
nameErrorMessage.show();
errorText = ( '' === errorText ) ? nameErrorMessage.text() : errorText + nameErrorMessage.text();
// Announce error message via screen reader
wp.a11y.speak( errorText, 'assertive' );
}
return;
}

urlErrorMessage.hide();
nameErrorMessage.hide();
itemName.removeClass( 'invalid' )
.removeAttr( 'aria-invalid', 'true' )
.removeAttr( 'aria-describedby', 'custom-name-error' );
itemUrl.removeClass( 'invalid' )
.removeAttr( 'aria-invalid', 'true' )
.removeAttr( 'aria-describedby', 'custom-name-error' );

menuItem = {
'title': itemName.val(),
'url': url,
'type': 'custom',
'type_label': api.Menus.data.l10n.custom_label,
'object': 'custom'
};

this.currentMenuControl.addItemToMenu( menuItem );

// Reset the custom link form.
itemUrl.val( '' ).attr( 'placeholder', 'https://' );
itemName.val( '' );
},

/**
* Submit handler for keypress (enter) on field and click on button.
*
* @since 4.7.0
* @private
*
* @param {jQuery.Event} event Event.
* @return {void}
*/
_submitNew: function( event ) {
var container;

// Only proceed with keypress if it is Enter.
if ( 'keypress' === event.type && 13 !== event.which ) {
return;
}

if ( this.addingNew ) {
return;
}

container = $( event.target ).closest( '.accordion-section' );

this.submitNew( container );
},

/**
* Creates a new object and adds an associated menu item to the menu.
*
* @since 4.7.0
* @private
*
* @param {jQuery} container
* @return {void}
*/
submitNew: function( container ) {
var panel = this,
itemName = container.find( '.create-item-input' ),
title = itemName.val(),
dataContainer = container.find( '.available-menu-items-list' ),
itemType = dataContainer.data( 'type' ),
itemObject = dataContainer.data( 'object' ),
itemTypeLabel = dataContainer.data( 'type_label' ),
promise;

if ( ! this.currentMenuControl ) {
return;
}

// Only posts are supported currently.
if ( 'post_type' !== itemType ) {
return;
}

if ( '' === itemName.val().trim() ) {
itemName.addClass( 'invalid' );
itemName.focus();
return;
} else {
itemName.removeClass( 'invalid' );
container.find( '.accordion-section-title' ).addClass( 'loading' );
}

panel.addingNew = true;
itemName.attr( 'disabled', 'disabled' );
promise = api.Menus.insertAutoDraftPost( {
post_title: title,
post_type: itemObject
} );
promise.done( function( data ) {
var availableItem, $content, itemElement;
availableItem = new api.Menus.AvailableItemModel( {
'id': 'post-' + data.post_id, // Used for available menu item Backbone models.
'title': itemName.val(),
'type': itemType,
'type_label': itemTypeLabel,
'object': itemObject,
'object_id': data.post_id,
'url': data.url
} );

// Add new item to menu.
panel.currentMenuControl.addItemToMenu( availableItem.attributes );

// Add the new item to the list of available items.
api.Menus.availableMenuItemsPanel.collection.add( availableItem );
$content = container.find( '.available-menu-items-list' );
itemElement = $( wp.template( 'available-menu-item' )( availableItem.attributes ) );
itemElement.find( '.menu-item-handle:first' ).addClass( 'item-added' );
$content.prepend( itemElement );
$content.scrollTop();

// Reset the create content form.
itemName.val( '' ).removeAttr( 'disabled' );
panel.addingNew = false;
container.find( '.accordion-section-title' ).removeClass( 'loading' );
} );
},

// Opens the panel.
open: function( menuControl ) {
var panel = this, close;

this.currentMenuControl = menuControl;

this.itemSectionHeight();

if ( api.section.has( 'publish_settings' ) ) {
api.section( 'publish_settings' ).collapse();
}

$( 'body' ).addClass( 'adding-menu-items' );

close = function() {
panel.close();
$( this ).off( 'click', close );
};
$( '#customize-preview' ).on( 'click', close );

// Collapse all controls.
_( this.currentMenuControl.getMenuItemControls() ).each( function( control ) {
control.collapseForm();
} );

this.$el.find( '.selected' ).removeClass( 'selected' );

this.$search.trigger( 'focus' );
},

// Closes the panel.
close: function( options ) {
options = options || {};

if ( options.returnFocus && this.currentMenuControl ) {
this.currentMenuControl.container.find( '.add-new-menu-item' ).focus();
}

this.currentMenuControl = null;
this.selected = null;

$( 'body' ).removeClass( 'adding-menu-items' );
$( '#available-menu-items .menu-item-handle.item-added' ).removeClass( 'item-added' );

this.$search.val( '' ).trigger( 'input' );
},

// Add a few keyboard enhancements to the panel.
keyboardAccessible: function( event ) {
var isEnter = ( 13 === event.which ),
isEsc = ( 27 === event.which ),
isBackTab = ( 9 === event.which && event.shiftKey ),
isSearchFocused = $( event.target ).is( this.$search );

// If enter pressed but nothing entered, don't do anything.
if ( isEnter && ! this.$search.val() ) {
return;
}

if ( isSearchFocused && isBackTab ) {
this.currentMenuControl.container.find( '.add-new-menu-item' ).focus();
event.preventDefault(); // Avoid additional back-tab.
} else if ( isEsc ) {
this.close( { returnFocus: true } );
}
}
});

/**
* wp.customize.Menus.MenusPanel
*
* Customizer panel for menus. This is used only for screen options management.
* Note that 'menus' must match the WP_Customize_Menu_Panel::$type.
*
* @class wp.customize.Menus.MenusPanel
* @augments wp.customize.Panel
*/
api.Menus.MenusPanel = api.Panel.extend(/** @lends wp.customize.Menus.MenusPanel.prototype */{

attachEvents: function() {
api.Panel.prototype.attachEvents.call( this );

var panel = this,
panelMeta = panel.container.find( '.panel-meta' ),
help = panelMeta.find( '.customize-help-toggle' ),
content = panelMeta.find( '.customize-panel-description' ),
options = $( '#screen-options-wrap' ),
button = panelMeta.find( '.customize-screen-options-toggle' );
button.on( 'click keydown', function( event ) {
if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
return;
}
event.preventDefault();

// Hide description.
if ( content.not( ':hidden' ) ) {
content.slideUp( 'fast' );
help.attr( 'aria-expanded', 'false' );
}

if ( 'true' === button.attr( 'aria-expanded' ) ) {
button.attr( 'aria-expanded', 'false' );
panelMeta.removeClass( 'open' );
panelMeta.removeClass( 'active-menu-screen-options' );
options.slideUp( 'fast' );
} else {
button.attr( 'aria-expanded', 'true' );
panelMeta.addClass( 'open' );
panelMeta.addClass( 'active-menu-screen-options' );
options.slideDown( 'fast' );
}

return false;
} );

// Help toggle.
help.on( 'click keydown', function( event ) {
if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
return;
}
event.preventDefault();

if ( 'true' === button.attr( 'aria-expanded' ) ) {
button.attr( 'aria-expanded', 'false' );
help.attr( 'aria-expanded', 'true' );
panelMeta.addClass( 'open' );
panelMeta.removeClass( 'active-menu-screen-options' );
options.slideUp( 'fast' );
content.slideDown( 'fast' );
}
} );
},

/**
* Update field visibility when clicking on the field toggles.
*/
ready: function() {
var panel = this;
panel.container.find( '.hide-column-tog' ).on( 'click', function() {
panel.saveManageColumnsState();
});

// Inject additional heading into the menu locations section's head container.
api.section( 'menu_locations', function( section ) {
section.headContainer.prepend(
wp.template( 'nav-menu-locations-header' )( api.Menus.data )
);
} );
},

/**
* Save hidden column states.
*
* @since 4.3.0
* @private
*
* @return {void}
*/
saveManageColumnsState: _.debounce( function() {
var panel = this;
if ( panel._updateHiddenColumnsRequest ) {
panel._updateHiddenColumnsRequest.abort();
}

panel._updateHiddenColumnsRequest = wp.ajax.post( 'hidden-columns', {
hidden: panel.hidden(),
screenoptionnonce: $( '#screenoptionnonce' ).val(),
page: 'nav-menus'
} );
panel._updateHiddenColumnsRequest.always( function() {
panel._updateHiddenColumnsRequest = null;
} );
}, 2000 ),

/**
* @deprecated Since 4.7.0 now that the nav_menu sections are responsible for toggling the classes on their own containers.
*/
checked: function() {},

/**
* @deprecated Since 4.7.0 now that the nav_menu sections are responsible for toggling the classes on their own containers.
*/
unchecked: function() {},

/**
* Get hidden fields.
*
* @since 4.3.0
* @private
*
* @return {Array} Fields (columns) that are hidden.
*/
hidden: function() {
return $( '.hide-column-tog' ).not( ':checked' ).map( function() {
var id = this.id;
return id.substring( 0, id.length - 5 );
}).get().join( ',' );
}
} );

/**
* wp.customize.Menus.MenuSection
*
* Customizer section for menus. This is used only for lazy-loading child controls.
* Note that 'nav_menu' must match the WP_Customize_Menu_Section::$type.
*
* @class wp.customize.Menus.MenuSection
* @augments wp.customize.Section
*/
api.Menus.MenuSection = api.Section.extend(/** @lends wp.customize.Menus.MenuSection.prototype */{

/**
* Initialize.
*
* @since 4.3.0
*
* @param {string} id
* @param {Object} options
*/
initialize: function( id, options ) {
var section = this;
api.Section.prototype.initialize.call( section, id, options );
section.deferred.initSortables = $.Deferred();
},

/**
* Ready.
*/
ready: function() {
var section = this, fieldActiveToggles, handleFieldActiveToggle;

if ( 'undefined' === typeof section.params.menu_id ) {
throw new Error( 'params.menu_id was not defined' );
}

/*
* Since newly created sections won't be registered in PHP, we need to prevent the
* preview's sending of the activeSections to result in this control
* being deactivated when the preview refreshes. So we can hook onto
* the setting that has the same ID and its presence can dictate
* whether the section is active.
*/
section.active.validate = function() {
if ( ! api.has( section.id ) ) {
return false;
}
return !! api( section.id ).get();
};

section.populateControls();

section.navMenuLocationSettings = {};
section.assignedLocations = new api.Value( [] );

api.each(function( setting, id ) {
var matches = id.match( /^nav_menu_locations\[(.+?)]/ );
if ( matches ) {
section.navMenuLocationSettings[ matches[1] ] = setting;
setting.bind( function() {
section.refreshAssignedLocations();
});
}
});

section.assignedLocations.bind(function( to ) {
section.updateAssignedLocationsInSectionTitle( to );
});

section.refreshAssignedLocations();

api.bind( 'pane-contents-reflowed', function() {
// Skip menus that have been removed.
if ( ! section.contentContainer.parent().length ) {
return;
}
section.container.find( '.menu-item .menu-item-reorder-nav button' ).attr({ 'tabindex': '0', 'aria-hidden': 'false' });
section.container.find( '.menu-item.move-up-disabled .menus-move-up' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
section.container.find( '.menu-item.move-down-disabled .menus-move-down' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
section.container.find( '.menu-item.move-left-disabled .menus-move-left' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
section.container.find( '.menu-item.move-right-disabled .menus-move-right' ).attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
} );

/**
* Update the active field class for the content container for a given checkbox toggle.
*
* @this {jQuery}
* @return {void}
*/
handleFieldActiveToggle = function() {
var className = 'field-' + $( this ).val() + '-active';
section.contentContainer.toggleClass( className, $( this ).prop( 'checked' ) );
};
fieldActiveToggles = api.panel( 'nav_menus' ).contentContainer.find( '.metabox-prefs:first' ).find( '.hide-column-tog' );
fieldActiveToggles.each( handleFieldActiveToggle );
fieldActiveToggles.on( 'click', handleFieldActiveToggle );
},

populateControls: function() {
var section = this,
menuNameControlId,
menuLocationsControlId,
menuAutoAddControlId,
menuDeleteControlId,
menuControl,
menuNameControl,
menuLocationsControl,
menuAutoAddControl,
menuDeleteControl;

// Add the control for managing the menu name.
menuNameControlId = section.id + '[name]';
menuNameControl = api.control( menuNameControlId );
if ( ! menuNameControl ) {
menuNameControl = new api.controlConstructor.nav_menu_name( menuNameControlId, {
type: 'nav_menu_name',
label: api.Menus.data.l10n.menuNameLabel,
section: section.id,
priority: 0,
settings: {
'default': section.id
}
} );
api.control.add( menuNameControl );
menuNameControl.active.set( true );
}

// Add the menu control.
menuControl = api.control( section.id );
if ( ! menuControl ) {
menuControl = new api.controlConstructor.nav_menu( section.id, {
type: 'nav_menu',
section: section.id,
priority: 998,
settings: {
'default': section.id
},
menu_id: section.params.menu_id
} );
api.control.add( menuControl );
menuControl.active.set( true );
}

// Add the menu locations control.
menuLocationsControlId = section.id + '[locations]';
menuLocationsControl = api.control( menuLocationsControlId );
if ( ! menuLocationsControl ) {
menuLocationsControl = new api.controlConstructor.nav_menu_locations( menuLocationsControlId, {
section: section.id,
priority: 999,
settings: {
'default': section.id
},
menu_id: section.params.menu_id
} );
api.control.add( menuLocationsControl.id, menuLocationsControl );
menuControl.active.set( true );
}

// Add the control for managing the menu auto_add.
menuAutoAddControlId = section.id + '[auto_add]';
menuAutoAddControl = api.control( menuAutoAddControlId );
if ( ! menuAutoAddControl ) {
menuAutoAddControl = new api.controlConstructor.nav_menu_auto_add( menuAutoAddControlId, {
type: 'nav_menu_auto_add',
label: '',
section: section.id,
priority: 1000,
settings: {
'default': section.id
}
} );
api.control.add( menuAutoAddControl );
menuAutoAddControl.active.set( true );
}

// Add the control for deleting the menu.
menuDeleteControlId = section.id + '[delete]';
menuDeleteControl = api.control( menuDeleteControlId );
if ( ! menuDeleteControl ) {
menuDeleteControl = new api.Control( menuDeleteControlId, {
section: section.id,
priority: 1001,
templateId: 'nav-menu-delete-button'
} );
api.control.add( menuDeleteControl.id, menuDeleteControl );
menuDeleteControl.active.set( true );
menuDeleteControl.deferred.embedded.done( function () {
menuDeleteControl.container.find( 'button' ).on( 'click', function() {
var menuId = section.params.menu_id;
var menuControl = api.Menus.getMenuControl( menuId );
menuControl.setting.set( false );
});
} );
}
},

/**
*
*/
refreshAssignedLocations: function() {
var section = this,
menuTermId = section.params.menu_id,
currentAssignedLocations = [];
_.each( section.navMenuLocationSettings, function( setting, themeLocation ) {
if ( setting() === menuTermId ) {
currentAssignedLocations.push( themeLocation );
}
});
section.assignedLocations.set( currentAssignedLocations );
},

/**
* @param {Array} themeLocationSlugs Theme location slugs.
*/
updateAssignedLocationsInSectionTitle: function( themeLocationSlugs ) {
var section = this,
$title;

$title = section.container.find( '.accordion-section-title button:first' );
$title.find( '.menu-in-location' ).remove();
_.each( themeLocationSlugs, function( themeLocationSlug ) {
var $label, locationName;
$label = $( '<span class="menu-in-location"></span>' );
locationName = api.Menus.data.locationSlugMappedToName[ themeLocationSlug ];
$label.text( api.Menus.data.l10n.menuLocation.replace( '%s', locationName ) );
$title.append( $label );
});

section.container.toggleClass( 'assigned-to-menu-location', 0 !== themeLocationSlugs.length );

},

onChangeExpanded: function( expanded, args ) {
var section = this, completeCallback;

if ( expanded ) {
wpNavMenu.menuList = section.contentContainer;
wpNavMenu.targetList = wpNavMenu.menuList;

// Add attributes needed by wpNavMenu.
$( '#menu-to-edit' ).removeAttr( 'id' );
wpNavMenu.menuList.attr( 'id', 'menu-to-edit' ).addClass( 'menu' );

api.Menus.MenuItemControl.prototype.initAccessibility();

_.each( api.section( section.id ).controls(), function( control ) {
if ( 'nav_menu_item' === control.params.type ) {
control.actuallyEmbed();
}
} );

// Make sure Sortables is initialized after the section has been expanded to prevent `offset` issues.
if ( args.completeCallback ) {
completeCallback = args.completeCallback;
}
args.completeCallback = function() {
if ( 'resolved' !== section.deferred.initSortables.state() ) {
wpNavMenu.initSortables(); // Depends on menu-to-edit ID being set above.
section.deferred.initSortables.resolve( wpNavMenu.menuList ); // Now MenuControl can extend the sortable.

// @todo Note that wp.customize.reflowPaneContents() is debounced,
// so this immediate change will show a slight flicker while priorities get updated.
api.control( 'nav_menu[' + String( section.params.menu_id ) + ']' ).reflowMenuItems();
}
if ( _.isFunction( completeCallback ) ) {
completeCallback();
}
};
}
api.Section.prototype.onChangeExpanded.call( section, expanded, args );
},

/**
* Highlight how a user may create new menu items.
*
* This method reminds the user to create new menu items and how.
* It's exposed this way because this class knows best which UI needs
* highlighted but those expanding this section know more about why and
* when the affordance should be highlighted.
*
* @since 4.9.0
*
* @return {void}
*/
highlightNewItemButton: function() {
api.utils.highlightButton( this.contentContainer.find( '.add-new-menu-item' ), { delay: 2000 } );
}
});

/**
* Create a nav menu setting and section.
*
* @since 4.9.0
*
* @param {string} [name=''] Nav menu name.
* @return {wp.customize.Menus.MenuSection} Added nav menu.
*/
api.Menus.createNavMenu = function createNavMenu( name ) {
var customizeId, placeholderId, setting;
placeholderId = api.Menus.generatePlaceholderAutoIncrementId();

customizeId = 'nav_menu[' + String( placeholderId ) + ']';

// Register the menu control setting.
setting = api.create( customizeId, customizeId, {}, {
type: 'nav_menu',
transport: api.Menus.data.settingTransport,
previewer: api.previewer
} );
setting.set( $.extend(
{},
api.Menus.data.defaultSettingValues.nav_menu,
{
name: name || ''
}
) );

/*
* Add the menu section (and its controls).
* Note that this will automatically create the required controls
* inside via the Section's ready method.
*/
return api.section.add( new api.Menus.MenuSection( customizeId, {
panel: 'nav_menus',
title: displayNavMenuName( name ),
customizeAction: api.Menus.data.l10n.customizingMenus,
priority: 10,
menu_id: placeholderId
} ) );
};

/**
* wp.customize.Menus.NewMenuSection
*
* Customizer section for new menus.
*
* @class wp.customize.Menus.NewMenuSection
* @augments wp.customize.Section
*/
api.Menus.NewMenuSection = api.Section.extend(/** @lends wp.customize.Menus.NewMenuSection.prototype */{

/**
* Add behaviors for the accordion section.
*
* @since 4.3.0
*/
attachEvents: function() {
var section = this,
container = section.container,
contentContainer = section.contentContainer,
navMenuSettingPattern = /^nav_menu\[/;

section.headContainer.find( '.accordion-section-title' ).replaceWith(
wp.template( 'nav-menu-create-menu-section-title' )
);

/*
* We have to manually handle section expanded because we do not
* apply the `accordion-section-title` class to this button-driven section.
*/
container.on( 'click', '.customize-add-menu-button', function() {
section.expand();
});

contentContainer.on( 'keydown', '.menu-name-field', function( event ) {
if ( 13 === event.which ) { // Enter.
section.submit();
}
} );
contentContainer.on( 'click', '#customize-new-menu-submit', function( event ) {
section.submit();
event.stopPropagation();
event.preventDefault();
} );

/**
* Get number of non-deleted nav menus.
*
* @since 4.9.0
* @return {number} Count.
*/
function getNavMenuCount() {
var count = 0;
api.each( function( setting ) {
if ( navMenuSettingPattern.test( setting.id ) && false !== setting.get() ) {
count += 1;
}
} );
return count;
}

/**
* Update visibility of notice to prompt users to create menus.
*
* @since 4.9.0
* @return {void}
*/
function updateNoticeVisibility() {
container.find( '.add-new-menu-notice' ).prop( 'hidden', getNavMenuCount() > 0 );
}

/**
* Handle setting addition.
*
* @since 4.9.0
* @param {wp.customize.Setting} setting - Added setting.
* @return {void}
*/
function addChangeEventListener( setting ) {
if ( navMenuSettingPattern.test( setting.id ) ) {
setting.bind( updateNoticeVisibility );
updateNoticeVisibility();
}
}

/**
* Handle setting removal.
*
* @since 4.9.0
* @param {wp.customize.Setting} setting - Removed setting.
* @return {void}
*/
function removeChangeEventListener( setting ) {
if ( navMenuSettingPattern.test( setting.id ) ) {
setting.unbind( updateNoticeVisibility );
updateNoticeVisibility();
}
}

api.each( addChangeEventListener );
api.bind( 'add', addChangeEventListener );
api.bind( 'removed', removeChangeEventListener );
updateNoticeVisibility();

api.Section.prototype.attachEvents.apply( section, arguments );
},

/**
* Set up the control.
*
* @since 4.9.0
*/
ready: function() {
this.populateControls();
},

/**
* Create the controls for this section.
*
* @since 4.9.0
*/
populateControls: function() {
var section = this,
menuNameControlId,
menuLocationsControlId,
newMenuSubmitControlId,
menuNameControl,
menuLocationsControl,
newMenuSubmitControl;

menuNameControlId = section.id + '[name]';
menuNameControl = api.control( menuNameControlId );
if ( ! menuNameControl ) {
menuNameControl = new api.controlConstructor.nav_menu_name( menuNameControlId, {
label: api.Menus.data.l10n.menuNameLabel,
description: api.Menus.data.l10n.newMenuNameDescription,
section: section.id,
priority: 0
} );
api.control.add( menuNameControl.id, menuNameControl );
menuNameControl.active.set( true );
}

menuLocationsControlId = section.id + '[locations]';
menuLocationsControl = api.control( menuLocationsControlId );
if ( ! menuLocationsControl ) {
menuLocationsControl = new api.controlConstructor.nav_menu_locations( menuLocationsControlId, {
section: section.id,
priority: 1,
menu_id: '',
isCreating: true
} );
api.control.add( menuLocationsControlId, menuLocationsControl );
menuLocationsControl.active.set( true );
}

newMenuSubmitControlId = section.id + '[submit]';
newMenuSubmitControl = api.control( newMenuSubmitControlId );
if ( !newMenuSubmitControl ) {
newMenuSubmitControl = new api.Control( newMenuSubmitControlId, {
section: section.id,
priority: 1,
templateId: 'nav-menu-submit-new-button'
} );
api.control.add( newMenuSubmitControlId, newMenuSubmitControl );
newMenuSubmitControl.active.set( true );
}
},

/**
* Create the new menu with name and location supplied by the user.
*
* @since 4.9.0
*/
submit: function() {
var section = this,
contentContainer = section.contentContainer,
nameInput = contentContainer.find( '.menu-name-field' ).first(),
name = nameInput.val(),
menuSection;

if ( ! name ) {
nameInput.addClass( 'invalid' );
nameInput.focus();
return;
}

menuSection = api.Menus.createNavMenu( name );

// Clear name field.
nameInput.val( '' );
nameInput.removeClass( 'invalid' );

contentContainer.find( '.assigned-menu-location input[type=checkbox]' ).each( function() {
var checkbox = $( this ),
navMenuLocationSetting;

if ( checkbox.prop( 'checked' ) ) {
navMenuLocationSetting = api( 'nav_menu_locations[' + checkbox.data( 'location-id' ) + ']' );
navMenuLocationSetting.set( menuSection.params.menu_id );

// Reset state for next new menu.
checkbox.prop( 'checked', false );
}
} );

wp.a11y.speak( api.Menus.data.l10n.menuAdded );

// Focus on the new menu section.
menuSection.focus( {
completeCallback: function() {
menuSection.highlightNewItemButton();
}
} );
},

/**
* Select a default location.
*
* This method selects a single location by default so we can support
* creating a menu for a specific menu location.
*
* @since 4.9.0
*
* @param {string|null} locationId - The ID of the location to select. `null` clears all selections.
* @return {void}
*/
selectDefaultLocation: function( locationId ) {
var locationControl = api.control( this.id + '[locations]' ),
locationSelections = {};

if ( locationId !== null ) {
locationSelections[ locationId ] = true;
}

locationControl.setSelections( locationSelections );
}
});

/**
* wp.customize.Menus.MenuLocationControl
*
* Customizer control for menu locations (rendered as a <select>).
* Note that 'nav_menu_location' must match the WP_Customize_Nav_Menu_Location_Control::$type.
*
* @class wp.customize.Menus.MenuLocationControl
* @augments wp.customize.Control
*/
api.Menus.MenuLocationControl = api.Control.extend(/** @lends wp.customize.Menus.MenuLocationControl.prototype */{
initialize: function( id, options ) {
var control = this,
matches = id.match( /^nav_menu_locations\[(.+?)]/ );
control.themeLocation = matches[1];
api.Control.prototype.initialize.call( control, id, options );
},

ready: function() {
var control = this, navMenuIdRegex = /^nav_menu\[(-?\d+)]/;

// @todo It would be better if this was added directly on the setting itself, as opposed to the control.
control.setting.validate = function( value ) {
if ( '' === value ) {
return 0;
} else {
return parseInt( value, 10 );
}
};

// Create and Edit menu buttons.
control.container.find( '.create-menu' ).on( 'click', function() {
var addMenuSection = api.section( 'add_menu' );
addMenuSection.selectDefaultLocation( this.dataset.locationId );
addMenuSection.focus();
} );
control.container.find( '.edit-menu' ).on( 'click', function() {
var menuId = control.setting();
api.section( 'nav_menu[' + menuId + ']' ).focus();
});
control.setting.bind( 'change', function() {
var menuIsSelected = 0 !== control.setting();
control.container.find( '.create-menu' ).toggleClass( 'hidden', menuIsSelected );
control.container.find( '.edit-menu' ).toggleClass( 'hidden', ! menuIsSelected );
});

// Add/remove menus from the available options when they are added and removed.
api.bind( 'add', function( setting ) {
var option, menuId, matches = setting.id.match( navMenuIdRegex );
if ( ! matches || false === setting() ) {
return;
}
menuId = matches[1];
option = new Option( displayNavMenuName( setting().name ), menuId );
control.container.find( 'select' ).append( option );
});
api.bind( 'remove', function( setting ) {
var menuId, matches = setting.id.match( navMenuIdRegex );
if ( ! matches ) {
return;
}
menuId = parseInt( matches[1], 10 );
if ( control.setting() === menuId ) {
control.setting.set( '' );
}
control.container.find( 'option[value=' + menuId + ']' ).remove();
});
api.bind( 'change', function( setting ) {
var menuId, matches = setting.id.match( navMenuIdRegex );
if ( ! matches ) {
return;
}
menuId = parseInt( matches[1], 10 );
if ( false === setting() ) {
if ( control.setting() === menuId ) {
control.setting.set( '' );
}
control.container.find( 'option[value=' + menuId + ']' ).remove();
} else {
control.container.find( 'option[value=' + menuId + ']' ).text( displayNavMenuName( setting().name ) );
}
});
}
});

api.Menus.MenuItemControl = api.Control.extend(/** @lends wp.customize.Menus.MenuItemControl.prototype */{

/**
* wp.customize.Menus.MenuItemControl
*
* Customizer control for menu items.
* Note that 'menu_item' must match the WP_Customize_Menu_Item_Control::$type.
*
* @constructs wp.customize.Menus.MenuItemControl
* @augments wp.customize.Control
*
* @inheritDoc
*/
initialize: function( id, options ) {
var control = this;
control.expanded = new api.Value( false );
control.expandedArgumentsQueue = [];
control.expanded.bind( function( expanded ) {
var args = control.expandedArgumentsQueue.shift();
args = $.extend( {}, control.defaultExpandedArguments, args );
control.onChangeExpanded( expanded, args );
});
api.Control.prototype.initialize.call( control, id, options );
control.active.validate = function() {
var value, section = api.section( control.section() );
if ( section ) {
value = section.active();
} else {
value = false;
}
return value;
};
},

/**
* Set up the initial state of the screen reader accessibility information for menu items.
*
* @since 6.6.0
*/
initAccessibility: function() {
var control = this,
menu = $( '#menu-to-edit' );

// 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(){
control.refreshAdvancedAccessibilityOfItem( $( this ).find( 'button.item-edit' ) );
} );

// We have to update on click as well because we might hover first, change the item, and then click.
menu.on( 'click', 'button.item-edit', function() {
control.refreshAdvancedAccessibilityOfItem( $( this ) );
} );
},

/**
* 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
*
* @since 6.6.0
*/
refreshAdvancedAccessibilityOfItem: function( itemToRefresh ) {
// Only refresh accessibility when necessary.
if ( true !== $( itemToRefresh ).data( 'needs_accessibility_refresh' ) ) {
return;
}

var primaryItems, itemPosition, title,
parentItem, parentItemId, parentItemName, subItems, totalSubItems,
$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(),
menuItemType = $this.closest( '.menu-item-handle' ).find( '.item-type' ).text(),
totalMenuItems = $( '#menu-to-edit li' ).length;

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$s', menuItemType ).replace( '%3$d', itemPosition ).replace( '%4$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 + '"]' ),
totalSubItems = subItems.length,
itemPosition = $( subItems.parents( '.menu-item' ).get().reverse() ).index( menuItem ) + 1;

// String together help text for sub menu items.
if ( depth < 2 ) {
title = menus.subMenuFocus.replace( '%1$s', itemName ).replace( '%2$s', menuItemType ).replace( '%3$d', itemPosition ).replace( '%4$d', totalSubItems ).replace( '%5$s', parentItemName );
} else {
title = menus.subMenuMoreDepthFocus.replace( '%1$s', itemName ).replace( '%2$s', menuItemType ).replace( '%3$d', itemPosition ).replace( '%4$d', totalSubItems ).replace( '%5$s', parentItemName ).replace( '%6$d', depth );
}
}

$this.find( '.screen-reader-text' ).text( title );

// Mark this item's accessibility as refreshed.
$this.data( 'needs_accessibility_refresh', false );
},

/**
* Override the embed() method to do nothing,
* so that the control isn't embedded on load,
* unless the containing section is already expanded.
*
* @since 4.3.0
*/
embed: function() {
var control = this,
sectionId = control.section(),
section;
if ( ! sectionId ) {
return;
}
section = api.section( sectionId );
if ( ( section && section.expanded() ) || api.settings.autofocus.control === control.id ) {
control.actuallyEmbed();
}
},

/**
* This function is called in Section.onChangeExpanded() so the control
* will only get embedded when the Section is first expanded.
*
* @since 4.3.0
*/
actuallyEmbed: function() {
var control = this;
if ( 'resolved' === control.deferred.embedded.state() ) {
return;
}
control.renderContent();
control.deferred.embedded.resolve(); // This triggers control.ready().

// Mark all menu items as unprocessed.
$( 'button.item-edit' ).data( 'needs_accessibility_refresh', true );
},

/**
* Set up the control.
*/
ready: function() {
if ( 'undefined' === typeof this.params.menu_item_id ) {
throw new Error( 'params.menu_item_id was not defined' );
}

this._setupControlToggle();
this._setupReorderUI();
this._setupUpdateUI();
this._setupRemoveUI();
this._setupLinksUI();
this._setupTitleUI();
},

/**
* Show/hide the settings when clicking on the menu item handle.
*/
_setupControlToggle: function() {
var control = this;

this.container.find( '.menu-item-handle' ).on( 'click', function( e ) {
e.preventDefault();
e.stopPropagation();
var menuControl = control.getMenuControl(),
isDeleteBtn = $( e.target ).is( '.item-delete, .item-delete *' ),
isAddNewBtn = $( e.target ).is( '.add-new-menu-item, .add-new-menu-item *' );

if ( $( 'body' ).hasClass( 'adding-menu-items' ) && ! isDeleteBtn && ! isAddNewBtn ) {
api.Menus.availableMenuItemsPanel.close();
}

if ( menuControl.isReordering || menuControl.isSorting ) {
return;
}
control.toggleForm();
} );
},

/**
* Set up the menu-item-reorder-nav
*/
_setupReorderUI: function() {
var control = this, template, $reorderNav;

template = wp.template( 'menu-item-reorder-nav' );

// Add the menu item reordering elements to the menu item control.
control.container.find( '.item-controls' ).after( template );

// Handle clicks for up/down/left-right on the reorder nav.
$reorderNav = control.container.find( '.menu-item-reorder-nav' );
$reorderNav.find( '.menus-move-up, .menus-move-down, .menus-move-left, .menus-move-right' ).on( 'click', function() {
var moveBtn = $( this );
control.params.depth = control.getDepth();

moveBtn.focus();

var isMoveUp = moveBtn.is( '.menus-move-up' ),
isMoveDown = moveBtn.is( '.menus-move-down' ),
isMoveLeft = moveBtn.is( '.menus-move-left' ),
isMoveRight = moveBtn.is( '.menus-move-right' );

if ( isMoveUp ) {
control.moveUp();
} else if ( isMoveDown ) {
control.moveDown();
} else if ( isMoveLeft ) {
control.moveLeft();
} else if ( isMoveRight ) {
control.moveRight();
control.params.depth += 1;
}

moveBtn.focus(); // Re-focus after the container was moved.

// Mark all menu items as unprocessed.
$( 'button.item-edit' ).data( 'needs_accessibility_refresh', true );
} );
},

/**
* Set up event handlers for menu item updating.
*/
_setupUpdateUI: function() {
var control = this,
settingValue = control.setting(),
updateNotifications;

control.elements = {};
control.elements.url = new api.Element( control.container.find( '.edit-menu-item-url' ) );
control.elements.title = new api.Element( control.container.find( '.edit-menu-item-title' ) );
control.elements.attr_title = new api.Element( control.container.find( '.edit-menu-item-attr-title' ) );
control.elements.target = new api.Element( control.container.find( '.edit-menu-item-target' ) );
control.elements.classes = new api.Element( control.container.find( '.edit-menu-item-classes' ) );
control.elements.xfn = new api.Element( control.container.find( '.edit-menu-item-xfn' ) );
control.elements.description = new api.Element( control.container.find( '.edit-menu-item-description' ) );
// @todo Allow other elements, added by plugins, to be automatically picked up here;
// allow additional values to be added to setting array.

_.each( control.elements, function( element, property ) {
element.bind(function( value ) {
if ( element.element.is( 'input[type=checkbox]' ) ) {
value = ( value ) ? element.element.val() : '';
}

var settingValue = control.setting();
if ( settingValue && settingValue[ property ] !== value ) {
settingValue = _.clone( settingValue );
settingValue[ property ] = value;
control.setting.set( settingValue );
}
});
if ( settingValue ) {
if ( ( property === 'classes' || property === 'xfn' ) && _.isArray( settingValue[ property ] ) ) {
element.set( settingValue[ property ].join( ' ' ) );
} else {
element.set( settingValue[ property ] );
}
}
});

control.setting.bind(function( to, from ) {
var itemId = control.params.menu_item_id,
followingSiblingItemControls = [],
childrenItemControls = [],
menuControl;

if ( false === to ) {
menuControl = api.control( 'nav_menu[' + String( from.nav_menu_term_id ) + ']' );
control.container.remove();

_.each( menuControl.getMenuItemControls(), function( otherControl ) {
if ( from.menu_item_parent === otherControl.setting().menu_item_parent && otherControl.setting().position > from.position ) {
followingSiblingItemControls.push( otherControl );
} else if ( otherControl.setting().menu_item_parent === itemId ) {
childrenItemControls.push( otherControl );
}
});

// Shift all following siblings by the number of children this item has.
_.each( followingSiblingItemControls, function( followingSiblingItemControl ) {
var value = _.clone( followingSiblingItemControl.setting() );
value.position += childrenItemControls.length;
followingSiblingItemControl.setting.set( value );
});

// Now move the children up to be the new subsequent siblings.
_.each( childrenItemControls, function( childrenItemControl, i ) {
var value = _.clone( childrenItemControl.setting() );
value.position = from.position + i;
value.menu_item_parent = from.menu_item_parent;
childrenItemControl.setting.set( value );
});

menuControl.debouncedReflowMenuItems();
} else {
// Update the elements' values to match the new setting properties.
_.each( to, function( value, key ) {
if ( control.elements[ key] ) {
control.elements[ key ].set( to[ key ] );
}
} );
control.container.find( '.menu-item-data-parent-id' ).val( to.menu_item_parent );

// Handle UI updates when the position or depth (parent) change.
if ( to.position !== from.position || to.menu_item_parent !== from.menu_item_parent ) {
control.getMenuControl().debouncedReflowMenuItems();
}
}
});

// Style the URL field as invalid when there is an invalid_url notification.
updateNotifications = function() {
control.elements.url.element.toggleClass( 'invalid', control.setting.notifications.has( 'invalid_url' ) );
};
control.setting.notifications.bind( 'add', updateNotifications );
control.setting.notifications.bind( 'removed', updateNotifications );
},

/**
* Set up event handlers for menu item deletion.
*/
_setupRemoveUI: function() {
var control = this, $removeBtn;

// Configure delete button.
$removeBtn = control.container.find( '.item-delete' );

$removeBtn.on( 'click', function() {
// Find an adjacent element to add focus to when this menu item goes away.
var addingItems = true, $adjacentFocusTarget, $next, $prev,
instanceCounter = 0, // Instance count of the menu item deleted.
deleteItemOriginalItemId = control.params.original_item_id,
addedItems = control.getMenuControl().$sectionContent.find( '.menu-item' ),
availableMenuItem;

if ( ! $( 'body' ).hasClass( 'adding-menu-items' ) ) {
addingItems = false;
}

$next = control.container.nextAll( '.customize-control-nav_menu_item:visible' ).first();
$prev = control.container.prevAll( '.customize-control-nav_menu_item:visible' ).first();

if ( $next.length ) {
$adjacentFocusTarget = $next.find( false === addingItems ? '.item-edit' : '.item-delete' ).first();
} else if ( $prev.length ) {
$adjacentFocusTarget = $prev.find( false === addingItems ? '.item-edit' : '.item-delete' ).first();
} else {
$adjacentFocusTarget = control.container.nextAll( '.customize-control-nav_menu' ).find( '.add-new-menu-item' ).first();
}

/*
* If the menu item deleted is the only of its instance left,
* remove the check icon of this menu item in the right panel.
*/
_.each( addedItems, function( addedItem ) {
var menuItemId, menuItemControl, matches;

// This is because menu item that's deleted is just hidden.
if ( ! $( addedItem ).is( ':visible' ) ) {
return;
}

matches = addedItem.getAttribute( 'id' ).match( /^customize-control-nav_menu_item-(-?\d+)$/, '' );
if ( ! matches ) {
return;
}

menuItemId = parseInt( matches[1], 10 );
menuItemControl = api.control( 'nav_menu_item[' + String( menuItemId ) + ']' );

// Check for duplicate menu items.
if ( menuItemControl && deleteItemOriginalItemId == menuItemControl.params.original_item_id ) {
instanceCounter++;
}
} );

if ( instanceCounter <= 1 ) {
// Revert the check icon to add icon.
availableMenuItem = $( '#menu-item-tpl-' + control.params.original_item_id );
availableMenuItem.removeClass( 'selected' );
availableMenuItem.find( '.menu-item-handle' ).removeClass( 'item-added' );
}

control.container.slideUp( function() {
control.setting.set( false );
wp.a11y.speak( api.Menus.data.l10n.itemDeleted );
$adjacentFocusTarget.focus(); // Keyboard accessibility.
} );

control.setting.set( false );
} );
},

_setupLinksUI: function() {
var $origBtn;

// Configure original link.
$origBtn = this.container.find( 'a.original-link' );

$origBtn.on( 'click', function( e ) {
e.preventDefault();
api.previewer.previewUrl( e.target.toString() );
} );
},

/**
* Update item handle title when changed.
*/
_setupTitleUI: function() {
var control = this, titleEl;

// Ensure that whitespace is trimmed on blur so placeholder can be shown.
control.container.find( '.edit-menu-item-title' ).on( 'blur', function() {
$( this ).val( $( this ).val().trim() );
} );

titleEl = control.container.find( '.menu-item-title' );
control.setting.bind( function( item ) {
var trimmedTitle, titleText;
if ( ! item ) {
return;
}
item.title = item.title || '';
trimmedTitle = item.title.trim();

titleText = trimmedTitle || item.original_title || api.Menus.data.l10n.untitled;

if ( item._invalid ) {
titleText = api.Menus.data.l10n.invalidTitleTpl.replace( '%s', titleText );
}

// Don't update to an empty title.
if ( trimmedTitle || item.original_title ) {
titleEl
.text( titleText )
.removeClass( 'no-title' );
} else {
titleEl
.text( titleText )
.addClass( 'no-title' );
}
} );
},

/**
*
* @return {number}
*/
getDepth: function() {
var control = this, setting = control.setting(), depth = 0;
if ( ! setting ) {
return 0;
}
while ( setting && setting.menu_item_parent ) {
depth += 1;
control = api.control( 'nav_menu_item[' + setting.menu_item_parent + ']' );
if ( ! control ) {
break;
}
setting = control.setting();
}
return depth;
},

/**
* Amend the control's params with the data necessary for the JS template just in time.
*/
renderContent: function() {
var control = this,
settingValue = control.setting(),
containerClasses;

control.params.title = settingValue.title || '';
control.params.depth = control.getDepth();
control.container.data( 'item-depth', control.params.depth );
containerClasses = [
'menu-item',
'menu-item-depth-' + String( control.params.depth ),
'menu-item-' + settingValue.object,
'menu-item-edit-inactive'
];

if ( settingValue._invalid ) {
containerClasses.push( 'menu-item-invalid' );
control.params.title = api.Menus.data.l10n.invalidTitleTpl.replace( '%s', control.params.title );
} else if ( 'draft' === settingValue.status ) {
containerClasses.push( 'pending' );
control.params.title = api.Menus.data.pendingTitleTpl.replace( '%s', control.params.title );
}

control.params.el_classes = containerClasses.join( ' ' );
control.params.item_type_label = settingValue.type_label;
control.params.item_type = settingValue.type;
control.params.url = settingValue.url;
control.params.target = settingValue.target;
control.params.attr_title = settingValue.attr_title;
control.params.classes = _.isArray( settingValue.classes ) ? settingValue.classes.join( ' ' ) : settingValue.classes;
control.params.xfn = settingValue.xfn;
control.params.description = settingValue.description;
control.params.parent = settingValue.menu_item_parent;
control.params.original_title = settingValue.original_title || '';

control.container.addClass( control.params.el_classes );

api.Control.prototype.renderContent.call( control );
},

/***********************************************************************
* Begin public API methods
**********************************************************************/

/**
* @return {wp.customize.controlConstructor.nav_menu|null}
*/
getMenuControl: function() {
var control = this, settingValue = control.setting();
if ( settingValue && settingValue.nav_menu_term_id ) {
return api.control( 'nav_menu[' + settingValue.nav_menu_term_id + ']' );
} else {
return null;
}
},

/**
* Expand the accordion section containing a control
*/
expandControlSection: function() {
var $section = this.container.closest( '.accordion-section' );
if ( ! $section.hasClass( 'open' ) ) {
$section.find( '.accordion-section-title:first' ).trigger( 'click' );
}
},

/**
* @since 4.6.0
*
* @param {Boolean} expanded
* @param {Object} [params]
* @return {Boolean} False if state already applied.
*/
_toggleExpanded: api.Section.prototype._toggleExpanded,

/**
* @since 4.6.0
*
* @param {Object} [params]
* @return {Boolean} False if already expanded.
*/
expand: api.Section.prototype.expand,

/**
* Expand the menu item form control.
*
* @since 4.5.0 Added params.completeCallback.
*
* @param {Object} [params] - Optional params.
* @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
*/
expandForm: function( params ) {
this.expand( params );
},

/**
* @since 4.6.0
*
* @param {Object} [params]
* @return {Boolean} False if already collapsed.
*/
collapse: api.Section.prototype.collapse,

/**
* Collapse the menu item form control.
*
* @since 4.5.0 Added params.completeCallback.
*
* @param {Object} [params] - Optional params.
* @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
*/
collapseForm: function( params ) {
this.collapse( params );
},

/**
* Expand or collapse the menu item control.
*
* @deprecated this is poor naming, and it is better to directly set control.expanded( showOrHide )
* @since 4.5.0 Added params.completeCallback.
*
* @param {boolean} [showOrHide] - If not supplied, will be inverse of current visibility
* @param {Object} [params] - Optional params.
* @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
*/
toggleForm: function( showOrHide, params ) {
if ( typeof showOrHide === 'undefined' ) {
showOrHide = ! this.expanded();
}
if ( showOrHide ) {
this.expand( params );
} else {
this.collapse( params );
}
},

/**
* Expand or collapse the menu item control.
*
* @since 4.6.0
* @param {boolean} [showOrHide] - If not supplied, will be inverse of current visibility
* @param {Object} [params] - Optional params.
* @param {Function} [params.completeCallback] - Function to call when the form toggle has finished animating.
*/
onChangeExpanded: function( showOrHide, params ) {
var self = this, $menuitem, $inside, complete;

$menuitem = this.container;
$inside = $menuitem.find( '.menu-item-settings:first' );
if ( 'undefined' === typeof showOrHide ) {
showOrHide = ! $inside.is( ':visible' );
}

// Already expanded or collapsed.
if ( $inside.is( ':visible' ) === showOrHide ) {
if ( params && params.completeCallback ) {
params.completeCallback();
}
return;
}

if ( showOrHide ) {
// Close all other menu item controls before expanding this one.
api.control.each( function( otherControl ) {
if ( self.params.type === otherControl.params.type && self !== otherControl ) {
otherControl.collapseForm();
}
} );

complete = function() {
$menuitem
.removeClass( 'menu-item-edit-inactive' )
.addClass( 'menu-item-edit-active' );
self.container.trigger( 'expanded' );

if ( params && params.completeCallback ) {
params.completeCallback();
}
};

$menuitem.find( '.item-edit' ).attr( 'aria-expanded', 'true' );
$inside.slideDown( 'fast', complete );

self.container.trigger( 'expand' );
} else {
complete = function() {
$menuitem
.addClass( 'menu-item-edit-inactive' )
.removeClass( 'menu-item-edit-active' );
self.container.trigger( 'collapsed' );

if ( params && params.completeCallback ) {
params.completeCallback();
}
};

self.container.trigger( 'collapse' );

$menuitem.find( '.item-edit' ).attr( 'aria-expanded', 'false' );
$inside.slideUp( 'fast', complete );
}
},

/**
* Expand the containing menu section, expand the form, and focus on
* the first input in the control.
*
* @since 4.5.0 Added params.completeCallback.
*
* @param {Object} [params] - Params object.
* @param {Function} [params.completeCallback] - Optional callback function when focus has completed.
*/
focus: function( params ) {
params = params || {};
var control = this, originalCompleteCallback = params.completeCallback, focusControl;

focusControl = function() {
control.expandControlSection();

params.completeCallback = function() {
var focusable;

// Note that we can't use :focusable due to a jQuery UI issue. See: https://github.com/jquery/jquery-ui/pull/1583
focusable = control.container.find( '.menu-item-settings' ).find( 'input, select, textarea, button, object, a[href], [tabindex]' ).filter( ':visible' );
focusable.first().focus();

if ( originalCompleteCallback ) {
originalCompleteCallback();
}
};

control.expandForm( params );
};

if ( api.section.has( control.section() ) ) {
api.section( control.section() ).expand( {
completeCallback: focusControl
} );
} else {
focusControl();
}
},

/**
* Move menu item up one in the menu.
*/
moveUp: function() {
this._changePosition( -1 );
wp.a11y.speak( api.Menus.data.l10n.movedUp );
},

/**
* Move menu item up one in the menu.
*/
moveDown: function() {
this._changePosition( 1 );
wp.a11y.speak( api.Menus.data.l10n.movedDown );
},
/**
* Move menu item and all children up one level of depth.
*/
moveLeft: function() {
this._changeDepth( -1 );
wp.a11y.speak( api.Menus.data.l10n.movedLeft );
},

/**
* Move menu item and children one level deeper, as a submenu of the previous item.
*/
moveRight: function() {
this._changeDepth( 1 );
wp.a11y.speak( api.Menus.data.l10n.movedRight );
},

/**
* Note that this will trigger a UI update, causing child items to
* move as well and cardinal order class names to be updated.
*
* @private
*
* @param {number} offset 1|-1
*/
_changePosition: function( offset ) {
var control = this,
adjacentSetting,
settingValue = _.clone( control.setting() ),
siblingSettings = [],
realPosition;

if ( 1 !== offset && -1 !== offset ) {
throw new Error( 'Offset changes by 1 are only supported.' );
}

// Skip moving deleted items.
if ( ! control.setting() ) {
return;
}

// Locate the other items under the same parent (siblings).
_( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
if ( otherControl.setting().menu_item_parent === settingValue.menu_item_parent ) {
siblingSettings.push( otherControl.setting );
}
});
siblingSettings.sort(function( a, b ) {
return a().position - b().position;
});

realPosition = _.indexOf( siblingSettings, control.setting );
if ( -1 === realPosition ) {
throw new Error( 'Expected setting to be among siblings.' );
}

// Skip doing anything if the item is already at the edge in the desired direction.
if ( ( realPosition === 0 && offset < 0 ) || ( realPosition === siblingSettings.length - 1 && offset > 0 ) ) {
// @todo Should we allow a menu item to be moved up to break it out of a parent? Adopt with previous or following parent?
return;
}

// Update any adjacent menu item setting to take on this item's position.
adjacentSetting = siblingSettings[ realPosition + offset ];
if ( adjacentSetting ) {
adjacentSetting.set( $.extend(
_.clone( adjacentSetting() ),
{
position: settingValue.position
}
) );
}

settingValue.position += offset;
control.setting.set( settingValue );
},

/**
* Note that this will trigger a UI update, causing child items to
* move as well and cardinal order class names to be updated.
*
* @private
*
* @param {number} offset 1|-1
*/
_changeDepth: function( offset ) {
if ( 1 !== offset && -1 !== offset ) {
throw new Error( 'Offset changes by 1 are only supported.' );
}
var control = this,
settingValue = _.clone( control.setting() ),
siblingControls = [],
realPosition,
siblingControl,
parentControl;

// Locate the other items under the same parent (siblings).
_( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
if ( otherControl.setting().menu_item_parent === settingValue.menu_item_parent ) {
siblingControls.push( otherControl );
}
});
siblingControls.sort(function( a, b ) {
return a.setting().position - b.setting().position;
});

realPosition = _.indexOf( siblingControls, control );
if ( -1 === realPosition ) {
throw new Error( 'Expected control to be among siblings.' );
}

if ( -1 === offset ) {
// Skip moving left an item that is already at the top level.
if ( ! settingValue.menu_item_parent ) {
return;
}

parentControl = api.control( 'nav_menu_item[' + settingValue.menu_item_parent + ']' );

// Make this control the parent of all the following siblings.
_( siblingControls ).chain().slice( realPosition ).each(function( siblingControl, i ) {
siblingControl.setting.set(
$.extend(
{},
siblingControl.setting(),
{
menu_item_parent: control.params.menu_item_id,
position: i
}
)
);
});

// Increase the positions of the parent item's subsequent children to make room for this one.
_( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
var otherControlSettingValue, isControlToBeShifted;
isControlToBeShifted = (
otherControl.setting().menu_item_parent === parentControl.setting().menu_item_parent &&
otherControl.setting().position > parentControl.setting().position
);
if ( isControlToBeShifted ) {
otherControlSettingValue = _.clone( otherControl.setting() );
otherControl.setting.set(
$.extend(
otherControlSettingValue,
{ position: otherControlSettingValue.position + 1 }
)
);
}
});

// Make this control the following sibling of its parent item.
settingValue.position = parentControl.setting().position + 1;
settingValue.menu_item_parent = parentControl.setting().menu_item_parent;
control.setting.set( settingValue );

} else if ( 1 === offset ) {
// Skip moving right an item that doesn't have a previous sibling.
if ( realPosition === 0 ) {
return;
}

// Make the control the last child of the previous sibling.
siblingControl = siblingControls[ realPosition - 1 ];
settingValue.menu_item_parent = siblingControl.params.menu_item_id;
settingValue.position = 0;
_( control.getMenuControl().getMenuItemControls() ).each(function( otherControl ) {
if ( otherControl.setting().menu_item_parent === settingValue.menu_item_parent ) {
settingValue.position = Math.max( settingValue.position, otherControl.setting().position );
}
});
settingValue.position += 1;
control.setting.set( settingValue );
}
}
} );

/**
* wp.customize.Menus.MenuNameControl
*
* Customizer control for a nav menu's name.
*
* @class wp.customize.Menus.MenuNameControl
* @augments wp.customize.Control
*/
api.Menus.MenuNameControl = api.Control.extend(/** @lends wp.customize.Menus.MenuNameControl.prototype */{

ready: function() {
var control = this;

if ( control.setting ) {
var settingValue = control.setting();

control.nameElement = new api.Element( control.container.find( '.menu-name-field' ) );

control.nameElement.bind(function( value ) {
var settingValue = control.setting();
if ( settingValue && settingValue.name !== value ) {
settingValue = _.clone( settingValue );
settingValue.name = value;
control.setting.set( settingValue );
}
});
if ( settingValue ) {
control.nameElement.set( settingValue.name );
}

control.setting.bind(function( object ) {
if ( object ) {
control.nameElement.set( object.name );
}
});
}
}
});

/**
* wp.customize.Menus.MenuLocationsControl
*
* Customizer control for a nav menu's locations.
*
* @since 4.9.0
* @class wp.customize.Menus.MenuLocationsControl
* @augments wp.customize.Control
*/
api.Menus.MenuLocationsControl = api.Control.extend(/** @lends wp.customize.Menus.MenuLocationsControl.prototype */{

/**
* Set up the control.
*
* @since 4.9.0
*/
ready: function () {
var control = this;

control.container.find( '.assigned-menu-location' ).each(function() {
var container = $( this ),
checkbox = container.find( 'input[type=checkbox]' ),
element = new api.Element( checkbox ),
navMenuLocationSetting = api( 'nav_menu_locations[' + checkbox.data( 'location-id' ) + ']' ),
isNewMenu = control.params.menu_id === '',
updateCheckbox = isNewMenu ? _.noop : function( checked ) {
element.set( checked );
},
updateSetting = isNewMenu ? _.noop : function( checked ) {
navMenuLocationSetting.set( checked ? control.params.menu_id : 0 );
},
updateSelectedMenuLabel = function( selectedMenuId ) {
var menuSetting = api( 'nav_menu[' + String( selectedMenuId ) + ']' );
if ( ! selectedMenuId || ! menuSetting || ! menuSetting() ) {
container.find( '.theme-location-set' ).hide();
} else {
container.find( '.theme-location-set' ).show().find( 'span' ).text( displayNavMenuName( menuSetting().name ) );
}
};

updateCheckbox( navMenuLocationSetting.get() === control.params.menu_id );

checkbox.on( 'change', function() {
// Note: We can't use element.bind( function( checked ){ ... } ) here because it will trigger a change as well.
updateSetting( this.checked );
} );

navMenuLocationSetting.bind( function( selectedMenuId ) {
updateCheckbox( selectedMenuId === control.params.menu_id );
updateSelectedMenuLabel( selectedMenuId );
} );
updateSelectedMenuLabel( navMenuLocationSetting.get() );
});
},

/**
* Set the selected locations.
*
* This method sets the selected locations and allows us to do things like
* set the default location for a new menu.
*
* @since 4.9.0
*
* @param {Object.<string,boolean>} selections - A map of location selections.
* @return {void}
*/
setSelections: function( selections ) {
this.container.find( '.menu-location' ).each( function( i, checkboxNode ) {
var locationId = checkboxNode.dataset.locationId;
checkboxNode.checked = locationId in selections ? selections[ locationId ] : false;
} );
}
});

/**
* wp.customize.Menus.MenuAutoAddControl
*
* Customizer control for a nav menu's auto add.
*
* @class wp.customize.Menus.MenuAutoAddControl
* @augments wp.customize.Control
*/
api.Menus.MenuAutoAddControl = api.Control.extend(/** @lends wp.customize.Menus.MenuAutoAddControl.prototype */{

ready: function() {
var control = this,
settingValue = control.setting();

/*
* Since the control is not registered in PHP, we need to prevent the
* preview's sending of the activeControls to result in this control
* being deactivated.
*/
control.active.validate = function() {
var value, section = api.section( control.section() );
if ( section ) {
value = section.active();
} else {
value = false;
}
return value;
};

control.autoAddElement = new api.Element( control.container.find( 'input[type=checkbox].auto_add' ) );

control.autoAddElement.bind(function( value ) {
var settingValue = control.setting();
if ( settingValue && settingValue.name !== value ) {
settingValue = _.clone( settingValue );
settingValue.auto_add = value;
control.setting.set( settingValue );
}
});
if ( settingValue ) {
control.autoAddElement.set( settingValue.auto_add );
}

control.setting.bind(function( object ) {
if ( object ) {
control.autoAddElement.set( object.auto_add );
}
});
}

});

/**
* wp.customize.Menus.MenuControl
*
* Customizer control for menus.
* Note that 'nav_menu' must match the WP_Menu_Customize_Control::$type
*
* @class wp.customize.Menus.MenuControl
* @augments wp.customize.Control
*/
api.Menus.MenuControl = api.Control.extend(/** @lends wp.customize.Menus.MenuControl.prototype */{
/**
* Set up the control.
*/
ready: function() {
var control = this,
section = api.section( control.section() ),
menuId = control.params.menu_id,
menu = control.setting(),
name,
widgetTemplate,
select;

if ( 'undefined' === typeof this.params.menu_id ) {
throw new Error( 'params.menu_id was not defined' );
}

/*
* Since the control is not registered in PHP, we need to prevent the
* preview's sending of the activeControls to result in this control
* being deactivated.
*/
control.active.validate = function() {
var value;
if ( section ) {
value = section.active();
} else {
value = false;
}
return value;
};

control.$controlSection = section.headContainer;
control.$sectionContent = control.container.closest( '.accordion-section-content' );

this._setupModel();

api.section( control.section(), function( section ) {
section.deferred.initSortables.done(function( menuList ) {
control._setupSortable( menuList );
});
} );

this._setupAddition();
this._setupTitle();

// Add menu to Navigation Menu widgets.
if ( menu ) {
name = displayNavMenuName( menu.name );

// Add the menu to the existing controls.
api.control.each( function( widgetControl ) {
if ( ! widgetControl.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== widgetControl.params.widget_id_base ) {
return;
}
widgetControl.container.find( '.nav-menu-widget-form-controls:first' ).show();
widgetControl.container.find( '.nav-menu-widget-no-menus-message:first' ).hide();

select = widgetControl.container.find( 'select' );
if ( 0 === select.find( 'option[value=' + String( menuId ) + ']' ).length ) {
select.append( new Option( name, menuId ) );
}
} );

// Add the menu to the widget template.
widgetTemplate = $( '#available-widgets-list .widget-tpl:has( input.id_base[ value=nav_menu ] )' );
widgetTemplate.find( '.nav-menu-widget-form-controls:first' ).show();
widgetTemplate.find( '.nav-menu-widget-no-menus-message:first' ).hide();
select = widgetTemplate.find( '.widget-inside select:first' );
if ( 0 === select.find( 'option[value=' + String( menuId ) + ']' ).length ) {
select.append( new Option( name, menuId ) );
}
}

/*
* Wait for menu items to be added.
* Ideally, we'd bind to an event indicating construction is complete,
* but deferring appears to be the best option today.
*/
_.defer( function () {
control.updateInvitationVisibility();
} );
},

/**
* Update ordering of menu item controls when the setting is updated.
*/
_setupModel: function() {
var control = this,
menuId = control.params.menu_id;

control.setting.bind( function( to ) {
var name;
if ( false === to ) {
control._handleDeletion();
} else {
// Update names in the Navigation Menu widgets.
name = displayNavMenuName( to.name );
api.control.each( function( widgetControl ) {
if ( ! widgetControl.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== widgetControl.params.widget_id_base ) {
return;
}
var select = widgetControl.container.find( 'select' );
select.find( 'option[value=' + String( menuId ) + ']' ).text( name );
});
}
} );
},

/**
* Allow items in each menu to be re-ordered, and for the order to be previewed.
*
* Notice that the UI aspects here are handled by wpNavMenu.initSortables()
* which is called in MenuSection.onChangeExpanded()
*
* @param {Object} menuList - The element that has sortable().
*/
_setupSortable: function( menuList ) {
var control = this;

if ( ! menuList.is( control.$sectionContent ) ) {
throw new Error( 'Unexpected menuList.' );
}

menuList.on( 'sortstart', function() {
control.isSorting = true;
});

menuList.on( 'sortstop', function() {
setTimeout( function() { // Next tick.
var menuItemContainerIds = control.$sectionContent.sortable( 'toArray' ),
menuItemControls = [],
position = 0,
priority = 10;

control.isSorting = false;

// Reset horizontal scroll position when done dragging.
control.$sectionContent.scrollLeft( 0 );

_.each( menuItemContainerIds, function( menuItemContainerId ) {
var menuItemId, menuItemControl, matches;
matches = menuItemContainerId.match( /^customize-control-nav_menu_item-(-?\d+)$/, '' );
if ( ! matches ) {
return;
}
menuItemId = parseInt( matches[1], 10 );
menuItemControl = api.control( 'nav_menu_item[' + String( menuItemId ) + ']' );
if ( menuItemControl ) {
menuItemControls.push( menuItemControl );
}
} );

_.each( menuItemControls, function( menuItemControl ) {
if ( false === menuItemControl.setting() ) {
// Skip deleted items.
return;
}
var setting = _.clone( menuItemControl.setting() );
position += 1;
priority += 1;
setting.position = position;
menuItemControl.priority( priority );

// Note that wpNavMenu will be setting this .menu-item-data-parent-id input's value.
setting.menu_item_parent = parseInt( menuItemControl.container.find( '.menu-item-data-parent-id' ).val(), 10 );
if ( ! setting.menu_item_parent ) {
setting.menu_item_parent = 0;
}

menuItemControl.setting.set( setting );
});

// Mark all menu items as unprocessed.
$( 'button.item-edit' ).data( 'needs_accessibility_refresh', true );
});

});
control.isReordering = false;

/**
* Keyboard-accessible reordering.
*/
this.container.find( '.reorder-toggle' ).on( 'click', function() {
control.toggleReordering( ! control.isReordering );
} );
},

/**
* Set up UI for adding a new menu item.
*/
_setupAddition: function() {
var self = this;

this.container.find( '.add-new-menu-item' ).on( 'click', function( event ) {
if ( self.$sectionContent.hasClass( 'reordering' ) ) {
return;
}

if ( ! $( 'body' ).hasClass( 'adding-menu-items' ) ) {
$( this ).attr( 'aria-expanded', 'true' );
api.Menus.availableMenuItemsPanel.open( self );
} else {
$( this ).attr( 'aria-expanded', 'false' );
api.Menus.availableMenuItemsPanel.close();
event.stopPropagation();
}
} );
},

_handleDeletion: function() {
var control = this,
section,
menuId = control.params.menu_id,
removeSection,
widgetTemplate,
navMenuCount = 0;
section = api.section( control.section() );
removeSection = function() {
section.container.remove();
api.section.remove( section.id );
};

if ( section && section.expanded() ) {
section.collapse({
completeCallback: function() {
removeSection();
wp.a11y.speak( api.Menus.data.l10n.menuDeleted );
api.panel( 'nav_menus' ).focus();
}
});
} else {
removeSection();
}

api.each(function( setting ) {
if ( /^nav_menu\[/.test( setting.id ) && false !== setting() ) {
navMenuCount += 1;
}
});

// Remove the menu from any Navigation Menu widgets.
api.control.each(function( widgetControl ) {
if ( ! widgetControl.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== widgetControl.params.widget_id_base ) {
return;
}
var select = widgetControl.container.find( 'select' );
if ( select.val() === String( menuId ) ) {
select.prop( 'selectedIndex', 0 ).trigger( 'change' );
}

widgetControl.container.find( '.nav-menu-widget-form-controls:first' ).toggle( 0 !== navMenuCount );
widgetControl.container.find( '.nav-menu-widget-no-menus-message:first' ).toggle( 0 === navMenuCount );
widgetControl.container.find( 'option[value=' + String( menuId ) + ']' ).remove();
});

// Remove the menu to the nav menu widget template.
widgetTemplate = $( '#available-widgets-list .widget-tpl:has( input.id_base[ value=nav_menu ] )' );
widgetTemplate.find( '.nav-menu-widget-form-controls:first' ).toggle( 0 !== navMenuCount );
widgetTemplate.find( '.nav-menu-widget-no-menus-message:first' ).toggle( 0 === navMenuCount );
widgetTemplate.find( 'option[value=' + String( menuId ) + ']' ).remove();
},

/**
* Update Section Title as menu name is changed.
*/
_setupTitle: function() {
var control = this;

control.setting.bind( function( menu ) {
if ( ! menu ) {
return;
}

var section = api.section( control.section() ),
menuId = control.params.menu_id,
controlTitle = section.headContainer.find( '.accordion-section-title' ),
sectionTitle = section.contentContainer.find( '.customize-section-title h3' ),
location = section.headContainer.find( '.menu-in-location' ),
action = sectionTitle.find( '.customize-action' ),
name = displayNavMenuName( menu.name );

// Update the control title.
controlTitle.text( name );
if ( location.length ) {
location.appendTo( controlTitle );
}

// Update the section title.
sectionTitle.text( name );
if ( action.length ) {
action.prependTo( sectionTitle );
}

// Update the nav menu name in location selects.
api.control.each( function( control ) {
if ( /^nav_menu_locations\[/.test( control.id ) ) {
control.container.find( 'option[value=' + menuId + ']' ).text( name );
}
} );

// Update the nav menu name in all location checkboxes.
section.contentContainer.find( '.customize-control-checkbox input' ).each( function() {
if ( $( this ).prop( 'checked' ) ) {
$( '.current-menu-location-name-' + $( this ).data( 'location-id' ) ).text( name );
}
} );
} );
},

/***********************************************************************
* Begin public API methods
**********************************************************************/

/**
* Enable/disable the reordering UI
*
* @param {boolean} showOrHide to enable/disable reordering
*/
toggleReordering: function( showOrHide ) {
var addNewItemBtn = this.container.find( '.add-new-menu-item' ),
reorderBtn = this.container.find( '.reorder-toggle' ),
itemsTitle = this.$sectionContent.find( '.item-title' );

showOrHide = Boolean( showOrHide );

if ( showOrHide === this.$sectionContent.hasClass( 'reordering' ) ) {
return;
}

this.isReordering = showOrHide;
this.$sectionContent.toggleClass( 'reordering', showOrHide );
this.$sectionContent.sortable( this.isReordering ? 'disable' : 'enable' );
if ( this.isReordering ) {
addNewItemBtn.attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
reorderBtn.attr( 'aria-label', api.Menus.data.l10n.reorderLabelOff );
wp.a11y.speak( api.Menus.data.l10n.reorderModeOn );
itemsTitle.attr( 'aria-hidden', 'false' );
} else {
addNewItemBtn.removeAttr( 'tabindex aria-hidden' );
reorderBtn.attr( 'aria-label', api.Menus.data.l10n.reorderLabelOn );
wp.a11y.speak( api.Menus.data.l10n.reorderModeOff );
itemsTitle.attr( 'aria-hidden', 'true' );
}

if ( showOrHide ) {
_( this.getMenuItemControls() ).each( function( formControl ) {
formControl.collapseForm();
} );
}
},

/**
* @return {wp.customize.controlConstructor.nav_menu_item[]}
*/
getMenuItemControls: function() {
var menuControl = this,
menuItemControls = [],
menuTermId = menuControl.params.menu_id;

api.control.each(function( control ) {
if ( 'nav_menu_item' === control.params.type && control.setting() && menuTermId === control.setting().nav_menu_term_id ) {
menuItemControls.push( control );
}
});

return menuItemControls;
},

/**
* Make sure that each menu item control has the proper depth.
*/
reflowMenuItems: function() {
var menuControl = this,
menuItemControls = menuControl.getMenuItemControls(),
reflowRecursively;

reflowRecursively = function( context ) {
var currentMenuItemControls = [],
thisParent = context.currentParent;
_.each( context.menuItemControls, function( menuItemControl ) {
if ( thisParent === menuItemControl.setting().menu_item_parent ) {
currentMenuItemControls.push( menuItemControl );
// @todo We could remove this item from menuItemControls now, for efficiency.
}
});
currentMenuItemControls.sort( function( a, b ) {
return a.setting().position - b.setting().position;
});

_.each( currentMenuItemControls, function( menuItemControl ) {
// Update position.
context.currentAbsolutePosition += 1;
menuItemControl.priority.set( context.currentAbsolutePosition ); // This will change the sort order.

// Update depth.
if ( ! menuItemControl.container.hasClass( 'menu-item-depth-' + String( context.currentDepth ) ) ) {
_.each( menuItemControl.container.prop( 'className' ).match( /menu-item-depth-\d+/g ), function( className ) {
menuItemControl.container.removeClass( className );
});
menuItemControl.container.addClass( 'menu-item-depth-' + String( context.currentDepth ) );
}
menuItemControl.container.data( 'item-depth', context.currentDepth );

// Process any children items.
context.currentDepth += 1;
context.currentParent = menuItemControl.params.menu_item_id;
reflowRecursively( context );
context.currentDepth -= 1;
context.currentParent = thisParent;
});

// Update class names for reordering controls.
if ( currentMenuItemControls.length ) {
_( currentMenuItemControls ).each(function( menuItemControl ) {
menuItemControl.container.removeClass( 'move-up-disabled move-down-disabled move-left-disabled move-right-disabled' );
if ( 0 === context.currentDepth ) {
menuItemControl.container.addClass( 'move-left-disabled' );
} else if ( 10 === context.currentDepth ) {
menuItemControl.container.addClass( 'move-right-disabled' );
}
});

currentMenuItemControls[0].container
.addClass( 'move-up-disabled' )
.addClass( 'move-right-disabled' )
.toggleClass( 'move-down-disabled', 1 === currentMenuItemControls.length );
currentMenuItemControls[ currentMenuItemControls.length - 1 ].container
.addClass( 'move-down-disabled' )
.toggleClass( 'move-up-disabled', 1 === currentMenuItemControls.length );
}
};

reflowRecursively( {
menuItemControls: menuItemControls,
currentParent: 0,
currentDepth: 0,
currentAbsolutePosition: 0
} );

menuControl.updateInvitationVisibility( menuItemControls );
menuControl.container.find( '.reorder-toggle' ).toggle( menuItemControls.length > 1 );
},

/**
* Note that this function gets debounced so that when a lot of setting
* changes are made at once, for instance when moving a menu item that
* has child items, this function will only be called once all of the
* settings have been updated.
*/
debouncedReflowMenuItems: _.debounce( function() {
this.reflowMenuItems.apply( this, arguments );
}, 0 ),

/**
* Add a new item to this menu.
*
* @param {Object} item - Value for the nav_menu_item setting to be created.
* @return {wp.customize.Menus.controlConstructor.nav_menu_item} The newly-created nav_menu_item control instance.
*/
addItemToMenu: function( item ) {
var menuControl = this, customizeId, settingArgs, setting, menuItemControl, placeholderId, position = 0, priority = 10,
originalItemId = item.id || '';

_.each( menuControl.getMenuItemControls(), function( control ) {
if ( false === control.setting() ) {
return;
}
priority = Math.max( priority, control.priority() );
if ( 0 === control.setting().menu_item_parent ) {
position = Math.max( position, control.setting().position );
}
});
position += 1;
priority += 1;

item = $.extend(
{},
api.Menus.data.defaultSettingValues.nav_menu_item,
item,
{
nav_menu_term_id: menuControl.params.menu_id,
original_title: item.title,
position: position
}
);
delete item.id; // Only used by Backbone.

placeholderId = api.Menus.generatePlaceholderAutoIncrementId();
customizeId = 'nav_menu_item[' + String( placeholderId ) + ']';
settingArgs = {
type: 'nav_menu_item',
transport: api.Menus.data.settingTransport,
previewer: api.previewer
};
setting = api.create( customizeId, customizeId, {}, settingArgs );
setting.set( item ); // Change from initial empty object to actual item to mark as dirty.

// Add the menu item control.
menuItemControl = new api.controlConstructor.nav_menu_item( customizeId, {
type: 'nav_menu_item',
section: menuControl.id,
priority: priority,
settings: {
'default': customizeId
},
menu_item_id: placeholderId,
original_item_id: originalItemId
} );

api.control.add( menuItemControl );
setting.preview();
menuControl.debouncedReflowMenuItems();

wp.a11y.speak( api.Menus.data.l10n.itemAdded );

return menuItemControl;
},

/**
* Show an invitation to add new menu items when there are no menu items.
*
* @since 4.9.0
*
* @param {wp.customize.controlConstructor.nav_menu_item[]} optionalMenuItemControls
*/
updateInvitationVisibility: function ( optionalMenuItemControls ) {
var menuItemControls = optionalMenuItemControls || this.getMenuItemControls();

this.container.find( '.new-menu-item-invitation' ).toggle( menuItemControls.length === 0 );
}
} );

/**
* Extends wp.customize.controlConstructor with control constructor for
* menu_location, menu_item, nav_menu, and new_menu.
*/
$.extend( api.controlConstructor, {
nav_menu_location: api.Menus.MenuLocationControl,
nav_menu_item: api.Menus.MenuItemControl,
nav_menu: api.Menus.MenuControl,
nav_menu_name: api.Menus.MenuNameControl,
nav_menu_locations: api.Menus.MenuLocationsControl,
nav_menu_auto_add: api.Menus.MenuAutoAddControl
});

/**
* Extends wp.customize.panelConstructor with section constructor for menus.
*/
$.extend( api.panelConstructor, {
nav_menus: api.Menus.MenusPanel
});

/**
* Extends wp.customize.sectionConstructor with section constructor for menu.
*/
$.extend( api.sectionConstructor, {
nav_menu: api.Menus.MenuSection,
new_menu: api.Menus.NewMenuSection
});

/**
* Init Customizer for menus.
*/
api.bind( 'ready', function() {

// Set up the menu items panel.
api.Menus.availableMenuItemsPanel = new api.Menus.AvailableMenuItemsPanelView({
collection: api.Menus.availableMenuItems
});

api.bind( 'saved', function( data ) {
if ( data.nav_menu_updates || data.nav_menu_item_updates ) {
api.Menus.applySavedData( data );
}
} );

/*
* Reset the list of posts created in the customizer once published.
* The setting is updated quietly (bypassing events being triggered)
* so that the customized state doesn't become immediately dirty.
*/
api.state( 'changesetStatus' ).bind( function( status ) {
if ( 'publish' === status ) {
api( 'nav_menus_created_posts' )._value = [];
}
} );

// Open and focus menu control.
api.previewer.bind( 'focus-nav-menu-item-control', api.Menus.focusMenuItemControl );
} );

/**
* When customize_save comes back with a success, make sure any inserted
* nav menus and items are properly re-added with their newly-assigned IDs.
*
* @alias wp.customize.Menus.applySavedData
*
* @param {Object} data
* @param {Array} data.nav_menu_updates
* @param {Array} data.nav_menu_item_updates
*/
api.Menus.applySavedData = function( data ) {

var insertedMenuIdMapping = {}, insertedMenuItemIdMapping = {};

_( data.nav_menu_updates ).each(function( update ) {
var oldCustomizeId, newCustomizeId, customizeId, oldSetting, newSetting, setting, settingValue, oldSection, newSection, wasSaved, widgetTemplate, navMenuCount, shouldExpandNewSection;
if ( 'inserted' === update.status ) {
if ( ! update.previous_term_id ) {
throw new Error( 'Expected previous_term_id' );
}
if ( ! update.term_id ) {
throw new Error( 'Expected term_id' );
}
oldCustomizeId = 'nav_menu[' + String( update.previous_term_id ) + ']';
if ( ! api.has( oldCustomizeId ) ) {
throw new Error( 'Expected setting to exist: ' + oldCustomizeId );
}
oldSetting = api( oldCustomizeId );
if ( ! api.section.has( oldCustomizeId ) ) {
throw new Error( 'Expected control to exist: ' + oldCustomizeId );
}
oldSection = api.section( oldCustomizeId );

settingValue = oldSetting.get();
if ( ! settingValue ) {
throw new Error( 'Did not expect setting to be empty (deleted).' );
}
settingValue = $.extend( _.clone( settingValue ), update.saved_value );

insertedMenuIdMapping[ update.previous_term_id ] = update.term_id;
newCustomizeId = 'nav_menu[' + String( update.term_id ) + ']';
newSetting = api.create( newCustomizeId, newCustomizeId, settingValue, {
type: 'nav_menu',
transport: api.Menus.data.settingTransport,
previewer: api.previewer
} );

shouldExpandNewSection = oldSection.expanded();
if ( shouldExpandNewSection ) {
oldSection.collapse();
}

// Add the menu section.
newSection = new api.Menus.MenuSection( newCustomizeId, {
panel: 'nav_menus',
title: settingValue.name,
customizeAction: api.Menus.data.l10n.customizingMenus,
type: 'nav_menu',
priority: oldSection.priority.get(),
menu_id: update.term_id
} );

// Add new control for the new menu.
api.section.add( newSection );

// Update the values for nav menus in Navigation Menu controls.
api.control.each( function( setting ) {
if ( ! setting.extended( api.controlConstructor.widget_form ) || 'nav_menu' !== setting.params.widget_id_base ) {
return;
}
var select, oldMenuOption, newMenuOption;
select = setting.container.find( 'select' );
oldMenuOption = select.find( 'option[value=' + String( update.previous_term_id ) + ']' );
newMenuOption = select.find( 'option[value=' + String( update.term_id ) + ']' );
newMenuOption.prop( 'selected', oldMenuOption.prop( 'selected' ) );
oldMenuOption.remove();
} );

// Delete the old placeholder nav_menu.
oldSetting.callbacks.disable(); // Prevent setting triggering Customizer dirty state when set.
oldSetting.set( false );
oldSetting.preview();
newSetting.preview();
oldSetting._dirty = false;

// Remove nav_menu section.
oldSection.container.remove();
api.section.remove( oldCustomizeId );

// Update the nav_menu widget to reflect removed placeholder menu.
navMenuCount = 0;
api.each(function( setting ) {
if ( /^nav_menu\[/.test( setting.id ) && false !== setting() ) {
navMenuCount += 1;
}
});
widgetTemplate = $( '#available-widgets-list .widget-tpl:has( input.id_base[ value=nav_menu ] )' );
widgetTemplate.find( '.nav-menu-widget-form-controls:first' ).toggle( 0 !== navMenuCount );
widgetTemplate.find( '.nav-menu-widget-no-menus-message:first' ).toggle( 0 === navMenuCount );
widgetTemplate.find( 'option[value=' + String( update.previous_term_id ) + ']' ).remove();

// Update the nav_menu_locations[...] controls to remove the placeholder menus from the dropdown options.
wp.customize.control.each(function( control ){
if ( /^nav_menu_locations\[/.test( control.id ) ) {
control.container.find( 'option[value=' + String( update.previous_term_id ) + ']' ).remove();
}
});

// Update nav_menu_locations to reference the new ID.
api.each( function( setting ) {
var wasSaved = api.state( 'saved' ).get();
if ( /^nav_menu_locations\[/.test( setting.id ) && setting.get() === update.previous_term_id ) {
setting.set( update.term_id );
setting._dirty = false; // Not dirty because this is has also just been done on server in WP_Customize_Nav_Menu_Setting::update().
api.state( 'saved' ).set( wasSaved );
setting.preview();
}
} );

if ( shouldExpandNewSection ) {
newSection.expand();
}
} else if ( 'updated' === update.status ) {
customizeId = 'nav_menu[' + String( update.term_id ) + ']';
if ( ! api.has( customizeId ) ) {
throw new Error( 'Expected setting to exist: ' + customizeId );
}

// Make sure the setting gets updated with its sanitized server value (specifically the conflict-resolved name).
setting = api( customizeId );
if ( ! _.isEqual( update.saved_value, setting.get() ) ) {
wasSaved = api.state( 'saved' ).get();
setting.set( update.saved_value );
setting._dirty = false;
api.state( 'saved' ).set( wasSaved );
}
}
} );

// Build up mapping of nav_menu_item placeholder IDs to inserted IDs.
_( data.nav_menu_item_updates ).each(function( update ) {
if ( update.previous_post_id ) {
insertedMenuItemIdMapping[ update.previous_post_id ] = update.post_id;
}
});

_( data.nav_menu_item_updates ).each(function( update ) {
var oldCustomizeId, newCustomizeId, oldSetting, newSetting, settingValue, oldControl, newControl;
if ( 'inserted' === update.status ) {
if ( ! update.previous_post_id ) {
throw new Error( 'Expected previous_post_id' );
}
if ( ! update.post_id ) {
throw new Error( 'Expected post_id' );
}
oldCustomizeId = 'nav_menu_item[' + String( update.previous_post_id ) + ']';
if ( ! api.has( oldCustomizeId ) ) {
throw new Error( 'Expected setting to exist: ' + oldCustomizeId );
}
oldSetting = api( oldCustomizeId );
if ( ! api.control.has( oldCustomizeId ) ) {
throw new Error( 'Expected control to exist: ' + oldCustomizeId );
}
oldControl = api.control( oldCustomizeId );

settingValue = oldSetting.get();
if ( ! settingValue ) {
throw new Error( 'Did not expect setting to be empty (deleted).' );
}
settingValue = _.clone( settingValue );

// If the parent menu item was also inserted, update the menu_item_parent to the new ID.
if ( settingValue.menu_item_parent < 0 ) {
if ( ! insertedMenuItemIdMapping[ settingValue.menu_item_parent ] ) {
throw new Error( 'inserted ID for menu_item_parent not available' );
}
settingValue.menu_item_parent = insertedMenuItemIdMapping[ settingValue.menu_item_parent ];
}

// If the menu was also inserted, then make sure it uses the new menu ID for nav_menu_term_id.
if ( insertedMenuIdMapping[ settingValue.nav_menu_term_id ] ) {
settingValue.nav_menu_term_id = insertedMenuIdMapping[ settingValue.nav_menu_term_id ];
}

newCustomizeId = 'nav_menu_item[' + String( update.post_id ) + ']';
newSetting = api.create( newCustomizeId, newCustomizeId, settingValue, {
type: 'nav_menu_item',
transport: api.Menus.data.settingTransport,
previewer: api.previewer
} );

// Add the menu control.
newControl = new api.controlConstructor.nav_menu_item( newCustomizeId, {
type: 'nav_menu_item',
menu_id: update.post_id,
section: 'nav_menu[' + String( settingValue.nav_menu_term_id ) + ']',
priority: oldControl.priority.get(),
settings: {
'default': newCustomizeId
},
menu_item_id: update.post_id
} );

// Remove old control.
oldControl.container.remove();
api.control.remove( oldCustomizeId );

// Add new control to take its place.
api.control.add( newControl );

// Delete the placeholder and preview the new setting.
oldSetting.callbacks.disable(); // Prevent setting triggering Customizer dirty state when set.
oldSetting.set( false );
oldSetting.preview();
newSetting.preview();
oldSetting._dirty = false;

newControl.container.toggleClass( 'menu-item-edit-inactive', oldControl.container.hasClass( 'menu-item-edit-inactive' ) );
}
});

/*
* Update the settings for any nav_menu widgets that had selected a placeholder ID.
*/
_.each( data.widget_nav_menu_updates, function( widgetSettingValue, widgetSettingId ) {
var setting = api( widgetSettingId );
if ( setting ) {
setting._value = widgetSettingValue;
setting.preview(); // Send to the preview now so that menu refresh will use the inserted menu.
}
});
};

/**
* Focus a menu item control.
*
* @alias wp.customize.Menus.focusMenuItemControl
*
* @param {string} menuItemId
*/
api.Menus.focusMenuItemControl = function( menuItemId ) {
var control = api.Menus.getMenuItemControl( menuItemId );
if ( control ) {
control.focus();
}
};

/**
* Get the control for a given menu.
*
* @alias wp.customize.Menus.getMenuControl
*
* @param menuId
* @return {wp.customize.controlConstructor.menus[]}
*/
api.Menus.getMenuControl = function( menuId ) {
return api.control( 'nav_menu[' + menuId + ']' );
};

/**
* Given a menu item ID, get the control associated with it.
*
* @alias wp.customize.Menus.getMenuItemControl
*
* @param {string} menuItemId
* @return {Object|null}
*/
api.Menus.getMenuItemControl = function( menuItemId ) {
return api.control( menuItemIdToSettingId( menuItemId ) );
};

/**
* @alias wp.customize.Menus~menuItemIdToSettingId
*
* @param {string} menuItemId
*/
function menuItemIdToSettingId( menuItemId ) {
return 'nav_menu_item[' + menuItemId + ']';
}

/**
* Apply sanitize_text_field()-like logic to the supplied name, returning a
* "unnammed" fallback string if the name is then empty.
*
* @alias wp.customize.Menus~displayNavMenuName
*
* @param {string} name
* @return {string}
*/
function displayNavMenuName( name ) {
name = name || '';
name = wp.sanitize.stripTagsAndEncodeText( name ); // Remove any potential tags from name.
name = name.toString().trim();
return name || api.Menus.data.l10n.unnamed;
}

})( wp.customize, wp, jQuery );