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customize-base.js (25758B)

---

 /**
  * @output wp-includes/js/customize-base.js
  */
 
 /** @namespace wp */
 window.wp = window.wp || {};
 
 (function( exports, $ ){
 	var api = {}, ctor, inherits,
 		slice = Array.prototype.slice;
 
 	// Shared empty constructor function to aid in prototype-chain creation.
 	ctor = function() {};
 
 	/**
 	 * Helper function to correctly set up the prototype chain, for subclasses.
 	 * Similar to `goog.inherits`, but uses a hash of prototype properties and
 	 * class properties to be extended.
 	 *
 	 * @param object parent      Parent class constructor to inherit from.
 	 * @param object protoProps  Properties to apply to the prototype for use as class instance properties.
 	 * @param object staticProps Properties to apply directly to the class constructor.
 	 * @return child The subclassed constructor.
 	 */
 	inherits = function( parent, protoProps, staticProps ) {
 		var child;
 
 		/*
 		 * The constructor function for the new subclass is either defined by you
 		 * (the "constructor" property in your `extend` definition), or defaulted
 		 * by us to simply call `super()`.
 		 */
 		if ( protoProps && protoProps.hasOwnProperty( 'constructor' ) ) {
 			child = protoProps.constructor;
 		} else {
 			child = function() {
 				/*
 				 * Storing the result `super()` before returning the value
 				 * prevents a bug in Opera where, if the constructor returns
 				 * a function, Opera will reject the return value in favor of
 				 * the original object. This causes all sorts of trouble.
 				 */
 				var result = parent.apply( this, arguments );
 				return result;
 			};
 		}
 
 		// Inherit class (static) properties from parent.
 		$.extend( child, parent );
 
 		// Set the prototype chain to inherit from `parent`,
 		// without calling `parent`'s constructor function.
 		ctor.prototype  = parent.prototype;
 		child.prototype = new ctor();
 
 		// Add prototype properties (instance properties) to the subclass,
 		// if supplied.
 		if ( protoProps ) {
 			$.extend( child.prototype, protoProps );
 		}
 
 		// Add static properties to the constructor function, if supplied.
 		if ( staticProps ) {
 			$.extend( child, staticProps );
 		}
 
 		// Correctly set child's `prototype.constructor`.
 		child.prototype.constructor = child;
 
 		// Set a convenience property in case the parent's prototype is needed later.
 		child.__super__ = parent.prototype;
 
 		return child;
 	};
 
 	/**
 	 * Base class for object inheritance.
 	 */
 	api.Class = function( applicator, argsArray, options ) {
 		var magic, args = arguments;
 
 		if ( applicator && argsArray && api.Class.applicator === applicator ) {
 			args = argsArray;
 			$.extend( this, options || {} );
 		}
 
 		magic = this;
 
 		/*
 		 * If the class has a method called "instance",
 		 * the return value from the class' constructor will be a function that
 		 * calls the "instance" method.
 		 *
 		 * It is also an object that has properties and methods inside it.
 		 */
 		if ( this.instance ) {
 			magic = function() {
 				return magic.instance.apply( magic, arguments );
 			};
 
 			$.extend( magic, this );
 		}
 
 		magic.initialize.apply( magic, args );
 		return magic;
 	};
 
 	/**
 	 * Creates a subclass of the class.
 	 *
 	 * @param object protoProps  Properties to apply to the prototype.
 	 * @param object staticProps Properties to apply directly to the class.
 	 * @return child The subclass.
 	 */
 	api.Class.extend = function( protoProps, staticProps ) {
 		var child = inherits( this, protoProps, staticProps );
 		child.extend = this.extend;
 		return child;
 	};
 
 	api.Class.applicator = {};
 
 	/**
 	 * Initialize a class instance.
 	 *
 	 * Override this function in a subclass as needed.
 	 */
 	api.Class.prototype.initialize = function() {};
 
 	/*
 	 * Checks whether a given instance extended a constructor.
 	 *
 	 * The magic surrounding the instance parameter causes the instanceof
 	 * keyword to return inaccurate results; it defaults to the function's
 	 * prototype instead of the constructor chain. Hence this function.
 	 */
 	api.Class.prototype.extended = function( constructor ) {
 		var proto = this;
 
 		while ( typeof proto.constructor !== 'undefined' ) {
 			if ( proto.constructor === constructor ) {
 				return true;
 			}
 			if ( typeof proto.constructor.__super__ === 'undefined' ) {
 				return false;
 			}
 			proto = proto.constructor.__super__;
 		}
 		return false;
 	};
 
 	/**
 	 * An events manager object, offering the ability to bind to and trigger events.
 	 *
 	 * Used as a mixin.
 	 */
 	api.Events = {
 		trigger: function( id ) {
 			if ( this.topics && this.topics[ id ] ) {
 				this.topics[ id ].fireWith( this, slice.call( arguments, 1 ) );
 			}
 			return this;
 		},
 
 		bind: function( id ) {
 			this.topics = this.topics || {};
 			this.topics[ id ] = this.topics[ id ] || $.Callbacks();
 			this.topics[ id ].add.apply( this.topics[ id ], slice.call( arguments, 1 ) );
 			return this;
 		},
 
 		unbind: function( id ) {
 			if ( this.topics && this.topics[ id ] ) {
 				this.topics[ id ].remove.apply( this.topics[ id ], slice.call( arguments, 1 ) );
 			}
 			return this;
 		}
 	};
 
 	/**
 	 * Observable values that support two-way binding.
 	 *
 	 * @memberOf wp.customize
 	 * @alias wp.customize.Value
 	 *
 	 * @constructor
 	 */
 	api.Value = api.Class.extend(/** @lends wp.customize.Value.prototype */{
 		/**
 		 * @param {mixed}  initial The initial value.
 		 * @param {Object} options
 		 */
 		initialize: function( initial, options ) {
 			this._value = initial; // @todo Potentially change this to a this.set() call.
 			this.callbacks = $.Callbacks();
 			this._dirty = false;
 
 			$.extend( this, options || {} );
 
 			this.set = this.set.bind( this );
 		},
 
 		/*
 		 * Magic. Returns a function that will become the instance.
 		 * Set to null to prevent the instance from extending a function.
 		 */
 		instance: function() {
 			return arguments.length ? this.set.apply( this, arguments ) : this.get();
 		},
 
 		/**
 		 * Get the value.
 		 *
 		 * @return {mixed}
 		 */
 		get: function() {
 			return this._value;
 		},
 
 		/**
 		 * Set the value and trigger all bound callbacks.
 		 *
 		 * @param {Object} to New value.
 		 */
 		set: function( to ) {
 			var from = this._value;
 
 			to = this._setter.apply( this, arguments );
 			to = this.validate( to );
 
 			// Bail if the sanitized value is null or unchanged.
 			if ( null === to || _.isEqual( from, to ) ) {
 				return this;
 			}
 
 			this._value = to;
 			this._dirty = true;
 
 			this.callbacks.fireWith( this, [ to, from ] );
 
 			return this;
 		},
 
 		_setter: function( to ) {
 			return to;
 		},
 
 		setter: function( callback ) {
 			var from = this.get();
 			this._setter = callback;
 			// Temporarily clear value so setter can decide if it's valid.
 			this._value = null;
 			this.set( from );
 			return this;
 		},
 
 		resetSetter: function() {
 			this._setter = this.constructor.prototype._setter;
 			this.set( this.get() );
 			return this;
 		},
 
 		validate: function( value ) {
 			return value;
 		},
 
 		/**
 		 * Bind a function to be invoked whenever the value changes.
 		 *
 		 * @param {...Function} A function, or multiple functions, to add to the callback stack.
 		 */
 		bind: function() {
 			this.callbacks.add.apply( this.callbacks, arguments );
 			return this;
 		},
 
 		/**
 		 * Unbind a previously bound function.
 		 *
 		 * @param {...Function} A function, or multiple functions, to remove from the callback stack.
 		 */
 		unbind: function() {
 			this.callbacks.remove.apply( this.callbacks, arguments );
 			return this;
 		},
 
 		link: function() { // values*
 			var set = this.set;
 			$.each( arguments, function() {
 				this.bind( set );
 			});
 			return this;
 		},
 
 		unlink: function() { // values*
 			var set = this.set;
 			$.each( arguments, function() {
 				this.unbind( set );
 			});
 			return this;
 		},
 
 		sync: function() { // values*
 			var that = this;
 			$.each( arguments, function() {
 				that.link( this );
 				this.link( that );
 			});
 			return this;
 		},
 
 		unsync: function() { // values*
 			var that = this;
 			$.each( arguments, function() {
 				that.unlink( this );
 				this.unlink( that );
 			});
 			return this;
 		}
 	});
 
 	/**
 	 * A collection of observable values.
 	 *
 	 * @memberOf wp.customize
 	 * @alias wp.customize.Values
 	 *
 	 * @constructor
 	 * @augments wp.customize.Class
 	 * @mixes wp.customize.Events
 	 */
 	api.Values = api.Class.extend(/** @lends wp.customize.Values.prototype */{
 
 		/**
 		 * The default constructor for items of the collection.
 		 *
 		 * @type {object}
 		 */
 		defaultConstructor: api.Value,
 
 		initialize: function( options ) {
 			$.extend( this, options || {} );
 
 			this._value = {};
 			this._deferreds = {};
 		},
 
 		/**
 		 * Get the instance of an item from the collection if only ID is specified.
 		 *
 		 * If more than one argument is supplied, all are expected to be IDs and
 		 * the last to be a function callback that will be invoked when the requested
 		 * items are available.
 		 *
 		 * @see {api.Values.when}
 		 *
 		 * @param {string} id ID of the item.
 		 * @param {...}       Zero or more IDs of items to wait for and a callback
 		 *                    function to invoke when they're available. Optional.
 		 * @return {mixed} The item instance if only one ID was supplied.
 		 *                 A Deferred Promise object if a callback function is supplied.
 		 */
 		instance: function( id ) {
 			if ( arguments.length === 1 ) {
 				return this.value( id );
 			}
 
 			return this.when.apply( this, arguments );
 		},
 
 		/**
 		 * Get the instance of an item.
 		 *
 		 * @param {string} id The ID of the item.
 		 * @return {[type]} [description]
 		 */
 		value: function( id ) {
 			return this._value[ id ];
 		},
 
 		/**
 		 * Whether the collection has an item with the given ID.
 		 *
 		 * @param {string} id The ID of the item to look for.
 		 * @return {boolean}
 		 */
 		has: function( id ) {
 			return typeof this._value[ id ] !== 'undefined';
 		},
 
 		/**
 		 * Add an item to the collection.
 		 *
 		 * @param {string|wp.customize.Class} item - The item instance to add, or the ID for the instance to add. When an ID string is supplied, then itemObject must be provided.
 		 * @param {wp.customize.Class}        [itemObject] - The item instance when the first argument is a ID string.
 		 * @return {wp.customize.Class} The new item's instance, or an existing instance if already added.
 		 */
 		add: function( item, itemObject ) {
 			var collection = this, id, instance;
 			if ( 'string' === typeof item ) {
 				id = item;
 				instance = itemObject;
 			} else {
 				if ( 'string' !== typeof item.id ) {
 					throw new Error( 'Unknown key' );
 				}
 				id = item.id;
 				instance = item;
 			}
 
 			if ( collection.has( id ) ) {
 				return collection.value( id );
 			}
 
 			collection._value[ id ] = instance;
 			instance.parent = collection;
 
 			// Propagate a 'change' event on an item up to the collection.
 			if ( instance.extended( api.Value ) ) {
 				instance.bind( collection._change );
 			}
 
 			collection.trigger( 'add', instance );
 
 			// If a deferred object exists for this item,
 			// resolve it.
 			if ( collection._deferreds[ id ] ) {
 				collection._deferreds[ id ].resolve();
 			}
 
 			return collection._value[ id ];
 		},
 
 		/**
 		 * Create a new item of the collection using the collection's default constructor
 		 * and store it in the collection.
 		 *
 		 * @param {string} id    The ID of the item.
 		 * @param {mixed}  value Any extra arguments are passed into the item's initialize method.
 		 * @return {mixed} The new item's instance.
 		 */
 		create: function( id ) {
 			return this.add( id, new this.defaultConstructor( api.Class.applicator, slice.call( arguments, 1 ) ) );
 		},
 
 		/**
 		 * Iterate over all items in the collection invoking the provided callback.
 		 *
 		 * @param {Function} callback Function to invoke.
 		 * @param {Object}   context  Object context to invoke the function with. Optional.
 		 */
 		each: function( callback, context ) {
 			context = typeof context === 'undefined' ? this : context;
 
 			$.each( this._value, function( key, obj ) {
 				callback.call( context, obj, key );
 			});
 		},
 
 		/**
 		 * Remove an item from the collection.
 		 *
 		 * @param {string} id The ID of the item to remove.
 		 */
 		remove: function( id ) {
 			var value = this.value( id );
 
 			if ( value ) {
 
 				// Trigger event right before the element is removed from the collection.
 				this.trigger( 'remove', value );
 
 				if ( value.extended( api.Value ) ) {
 					value.unbind( this._change );
 				}
 				delete value.parent;
 			}
 
 			delete this._value[ id ];
 			delete this._deferreds[ id ];
 
 			// Trigger removed event after the item has been eliminated from the collection.
 			if ( value ) {
 				this.trigger( 'removed', value );
 			}
 		},
 
 		/**
 		 * Runs a callback once all requested values exist.
 		 *
 		 * when( ids*, [callback] );
 		 *
 		 * For example:
 		 *     when( id1, id2, id3, function( value1, value2, value3 ) {} );
 		 *
 		 * @return $.Deferred.promise();
 		 */
 		when: function() {
 			var self = this,
 				ids  = slice.call( arguments ),
 				dfd  = $.Deferred();
 
 			// If the last argument is a callback, bind it to .done().
 			if ( typeof ids[ ids.length - 1 ] === 'function' ) {
 				dfd.done( ids.pop() );
 			}
 
 			/*
 			 * Create a stack of deferred objects for each item that is not
 			 * yet available, and invoke the supplied callback when they are.
 			 */
 			$.when.apply( $, $.map( ids, function( id ) {
 				if ( self.has( id ) ) {
 					return;
 				}
 
 				/*
 				 * The requested item is not available yet, create a deferred
 				 * object to resolve when it becomes available.
 				 */
 				return self._deferreds[ id ] = self._deferreds[ id ] || $.Deferred();
 			})).done( function() {
 				var values = $.map( ids, function( id ) {
 						return self( id );
 					});
 
 				// If a value is missing, we've used at least one expired deferred.
 				// Call Values.when again to generate a new deferred.
 				if ( values.length !== ids.length ) {
 					// ids.push( callback );
 					self.when.apply( self, ids ).done( function() {
 						dfd.resolveWith( self, values );
 					});
 					return;
 				}
 
 				dfd.resolveWith( self, values );
 			});
 
 			return dfd.promise();
 		},
 
 		/**
 		 * A helper function to propagate a 'change' event from an item
 		 * to the collection itself.
 		 */
 		_change: function() {
 			this.parent.trigger( 'change', this );
 		}
 	});
 
 	// Create a global events bus on the Customizer.
 	$.extend( api.Values.prototype, api.Events );
 
 
 	/**
 	 * Cast a string to a jQuery collection if it isn't already.
 	 *
 	 * @param {string|jQuery collection} element
 	 */
 	api.ensure = function( element ) {
 		return typeof element === 'string' ? $( element ) : element;
 	};
 
 	/**
 	 * An observable value that syncs with an element.
 	 *
 	 * Handles inputs, selects, and textareas by default.
 	 *
 	 * @memberOf wp.customize
 	 * @alias wp.customize.Element
 	 *
 	 * @constructor
 	 * @augments wp.customize.Value
 	 * @augments wp.customize.Class
 	 */
 	api.Element = api.Value.extend(/** @lends wp.customize.Element */{
 		initialize: function( element, options ) {
 			var self = this,
 				synchronizer = api.Element.synchronizer.html,
 				type, update, refresh;
 
 			this.element = api.ensure( element );
 			this.events = '';
 
 			if ( this.element.is( 'input, select, textarea' ) ) {
 				type = this.element.prop( 'type' );
 				this.events += ' change input';
 				synchronizer = api.Element.synchronizer.val;
 
 				if ( this.element.is( 'input' ) && api.Element.synchronizer[ type ] ) {
 					synchronizer = api.Element.synchronizer[ type ];
 				}
 			}
 
 			api.Value.prototype.initialize.call( this, null, $.extend( options || {}, synchronizer ) );
 			this._value = this.get();
 
 			update = this.update;
 			refresh = this.refresh;
 
 			this.update = function( to ) {
 				if ( to !== refresh.call( self ) ) {
 					update.apply( this, arguments );
 				}
 			};
 			this.refresh = function() {
 				self.set( refresh.call( self ) );
 			};
 
 			this.bind( this.update );
 			this.element.on( this.events, this.refresh );
 		},
 
 		find: function( selector ) {
 			return $( selector, this.element );
 		},
 
 		refresh: function() {},
 
 		update: function() {}
 	});
 
 	api.Element.synchronizer = {};
 
 	$.each( [ 'html', 'val' ], function( index, method ) {
 		api.Element.synchronizer[ method ] = {
 			update: function( to ) {
 				this.element[ method ]( to );
 			},
 			refresh: function() {
 				return this.element[ method ]();
 			}
 		};
 	});
 
 	api.Element.synchronizer.checkbox = {
 		update: function( to ) {
 			this.element.prop( 'checked', to );
 		},
 		refresh: function() {
 			return this.element.prop( 'checked' );
 		}
 	};
 
 	api.Element.synchronizer.radio = {
 		update: function( to ) {
 			this.element.filter( function() {
 				return this.value === to;
 			}).prop( 'checked', true );
 		},
 		refresh: function() {
 			return this.element.filter( ':checked' ).val();
 		}
 	};
 
 	$.support.postMessage = !! window.postMessage;
 
 	/**
 	 * A communicator for sending data from one window to another over postMessage.
 	 *
 	 * @memberOf wp.customize
 	 * @alias wp.customize.Messenger
 	 *
 	 * @constructor
 	 * @augments wp.customize.Class
 	 * @mixes wp.customize.Events
 	 */
 	api.Messenger = api.Class.extend(/** @lends wp.customize.Messenger.prototype */{
 		/**
 		 * Create a new Value.
 		 *
 		 * @param {string} key     Unique identifier.
 		 * @param {mixed}  initial Initial value.
 		 * @param {mixed}  options Options hash. Optional.
 		 * @return {Value} Class instance of the Value.
 		 */
 		add: function( key, initial, options ) {
 			return this[ key ] = new api.Value( initial, options );
 		},
 
 		/**
 		 * Initialize Messenger.
 		 *
 		 * @param {Object} params  - Parameters to configure the messenger.
 		 *        {string} params.url          - The URL to communicate with.
 		 *        {window} params.targetWindow - The window instance to communicate with. Default window.parent.
 		 *        {string} params.channel      - If provided, will send the channel with each message and only accept messages a matching channel.
 		 * @param {Object} options - Extend any instance parameter or method with this object.
 		 */
 		initialize: function( params, options ) {
 			// Target the parent frame by default, but only if a parent frame exists.
 			var defaultTarget = window.parent === window ? null : window.parent;
 
 			$.extend( this, options || {} );
 
 			this.add( 'channel', params.channel );
 			this.add( 'url', params.url || '' );
 			this.add( 'origin', this.url() ).link( this.url ).setter( function( to ) {
 				var urlParser = document.createElement( 'a' );
 				urlParser.href = to;
 				// Port stripping needed by IE since it adds to host but not to event.origin.
 				return urlParser.protocol + '//' + urlParser.host.replace( /:(80|443)$/, '' );
 			});
 
 			// First add with no value.
 			this.add( 'targetWindow', null );
 			// This avoids SecurityErrors when setting a window object in x-origin iframe'd scenarios.
 			this.targetWindow.set = function( to ) {
 				var from = this._value;
 
 				to = this._setter.apply( this, arguments );
 				to = this.validate( to );
 
 				if ( null === to || from === to ) {
 					return this;
 				}
 
 				this._value = to;
 				this._dirty = true;
 
 				this.callbacks.fireWith( this, [ to, from ] );
 
 				return this;
 			};
 			// Now set it.
 			this.targetWindow( params.targetWindow || defaultTarget );
 
 
 			/*
 			 * Since we want jQuery to treat the receive function as unique
 			 * to this instance, we give the function a new guid.
 			 *
 			 * This will prevent every Messenger's receive function from being
 			 * unbound when calling $.off( 'message', this.receive );
 			 */
 			this.receive = this.receive.bind( this );
 			this.receive.guid = $.guid++;
 
 			$( window ).on( 'message', this.receive );
 		},
 
 		destroy: function() {
 			$( window ).off( 'message', this.receive );
 		},
 
 		/**
 		 * Receive data from the other window.
 		 *
 		 * @param {jQuery.Event} event Event with embedded data.
 		 */
 		receive: function( event ) {
 			var message;
 
 			event = event.originalEvent;
 
 			if ( ! this.targetWindow || ! this.targetWindow() ) {
 				return;
 			}
 
 			// Check to make sure the origin is valid.
 			if ( this.origin() && event.origin !== this.origin() ) {
 				return;
 			}
 
 			// Ensure we have a string that's JSON.parse-able.
 			if ( typeof event.data !== 'string' || event.data[0] !== '{' ) {
 				return;
 			}
 
 			message = JSON.parse( event.data );
 
 			// Check required message properties.
 			if ( ! message || ! message.id || typeof message.data === 'undefined' ) {
 				return;
 			}
 
 			// Check if channel names match.
 			if ( ( message.channel || this.channel() ) && this.channel() !== message.channel ) {
 				return;
 			}
 
 			this.trigger( message.id, message.data );
 		},
 
 		/**
 		 * Send data to the other window.
 		 *
 		 * @param {string} id   The event name.
 		 * @param {Object} data Data.
 		 */
 		send: function( id, data ) {
 			var message;
 
 			data = typeof data === 'undefined' ? null : data;
 
 			if ( ! this.url() || ! this.targetWindow() ) {
 				return;
 			}
 
 			message = { id: id, data: data };
 			if ( this.channel() ) {
 				message.channel = this.channel();
 			}
 
 			this.targetWindow().postMessage( JSON.stringify( message ), this.origin() );
 		}
 	});
 
 	// Add the Events mixin to api.Messenger.
 	$.extend( api.Messenger.prototype, api.Events );
 
 	/**
 	 * Notification.
 	 *
 	 * @class
 	 * @augments wp.customize.Class
 	 * @since 4.6.0
 	 *
 	 * @memberOf wp.customize
 	 * @alias wp.customize.Notification
 	 *
 	 * @param {string}  code - The error code.
 	 * @param {object}  params - Params.
 	 * @param {string}  params.message=null - The error message.
 	 * @param {string}  [params.type=error] - The notification type.
 	 * @param {boolean} [params.fromServer=false] - Whether the notification was server-sent.
 	 * @param {string}  [params.setting=null] - The setting ID that the notification is related to.
 	 * @param {*}       [params.data=null] - Any additional data.
 	 */
 	api.Notification = api.Class.extend(/** @lends wp.customize.Notification.prototype */{
 
 		/**
 		 * Template function for rendering the notification.
 		 *
 		 * This will be populated with template option or else it will be populated with template from the ID.
 		 *
 		 * @since 4.9.0
 		 * @var {Function}
 		 */
 		template: null,
 
 		/**
 		 * ID for the template to render the notification.
 		 *
 		 * @since 4.9.0
 		 * @var {string}
 		 */
 		templateId: 'customize-notification',
 
 		/**
 		 * Additional class names to add to the notification container.
 		 *
 		 * @since 4.9.0
 		 * @var {string}
 		 */
 		containerClasses: '',
 
 		/**
 		 * Initialize notification.
 		 *
 		 * @since 4.9.0
 		 *
 		 * @param {string}   code - Notification code.
 		 * @param {Object}   params - Notification parameters.
 		 * @param {string}   params.message - Message.
 		 * @param {string}   [params.type=error] - Type.
 		 * @param {string}   [params.setting] - Related setting ID.
 		 * @param {Function} [params.template] - Function for rendering template. If not provided, this will come from templateId.
 		 * @param {string}   [params.templateId] - ID for template to render the notification.
 		 * @param {string}   [params.containerClasses] - Additional class names to add to the notification container.
 		 * @param {boolean}  [params.dismissible] - Whether the notification can be dismissed.
 		 */
 		initialize: function( code, params ) {
 			var _params;
 			this.code = code;
 			_params = _.extend(
 				{
 					message: null,
 					type: 'error',
 					fromServer: false,
 					data: null,
 					setting: null,
 					template: null,
 					dismissible: false,
 					containerClasses: ''
 				},
 				params
 			);
 			delete _params.code;
 			_.extend( this, _params );
 		},
 
 		/**
 		 * Render the notification.
 		 *
 		 * @since 4.9.0
 		 *
 		 * @return {jQuery} Notification container element.
 		 */
 		render: function() {
 			var notification = this, container, data;
 			if ( ! notification.template ) {
 				notification.template = wp.template( notification.templateId );
 			}
 			data = _.extend( {}, notification, {
 				alt: notification.parent && notification.parent.alt
 			} );
 			container = $( notification.template( data ) );
 
 			if ( notification.dismissible ) {
 				container.find( '.notice-dismiss' ).on( 'click keydown', function( event ) {
 					if ( 'keydown' === event.type && 13 !== event.which ) {
 						return;
 					}
 
 					if ( notification.parent ) {
 						notification.parent.remove( notification.code );
 					} else {
 						container.remove();
 					}
 				});
 			}
 
 			return container;
 		}
 	});
 
 	// The main API object is also a collection of all customizer settings.
 	api = $.extend( new api.Values(), api );
 
 	/**
 	 * Get all customize settings.
 	 *
 	 * @alias wp.customize.get
 	 *
 	 * @return {Object}
 	 */
 	api.get = function() {
 		var result = {};
 
 		this.each( function( obj, key ) {
 			result[ key ] = obj.get();
 		});
 
 		return result;
 	};
 
 	/**
 	 * Utility function namespace
 	 *
 	 * @namespace wp.customize.utils
 	 */
 	api.utils = {};
 
 	/**
 	 * Parse query string.
 	 *
 	 * @since 4.7.0
 	 * @access public
 	 *
 	 * @alias wp.customize.utils.parseQueryString
 	 *
 	 * @param {string} queryString Query string.
 	 * @return {Object} Parsed query string.
 	 */
 	api.utils.parseQueryString = function parseQueryString( queryString ) {
 		var queryParams = {};
 		_.each( queryString.split( '&' ), function( pair ) {
 			var parts, key, value;
 			parts = pair.split( '=', 2 );
 			if ( ! parts[0] ) {
 				return;
 			}
 			key = decodeURIComponent( parts[0].replace( /\+/g, ' ' ) );
 			key = key.replace( / /g, '_' ); // What PHP does.
 			if ( _.isUndefined( parts[1] ) ) {
 				value = null;
 			} else {
 				value = decodeURIComponent( parts[1].replace( /\+/g, ' ' ) );
 			}
 			queryParams[ key ] = value;
 		} );
 		return queryParams;
 	};
 
 	/**
 	 * Expose the API publicly on window.wp.customize
 	 *
 	 * @namespace wp.customize
 	 */
 	exports.customize = api;
 })( wp, jQuery );