Editor.js

/**
 * Sidebar Editor View
 *
 * @since    3.16.0
 * @version  3.27.0
 */
define( [
		'Views/LessonEditor',
		'Views/Quiz',
		'Views/Assignment',
		'Views/_Subview'
	], function(
		LessonEditor,
		Quiz,
		Assignment,
		Subview
	) {

		return Backbone.View.extend( _.defaults( {

			/**
			 * Current view state
			 *
			 * @type  {String}
			 */
			state: 'lesson', // [lesson|quiz]

			/**
			 * Current Subviews
			 *
			 * @type  {Object}
			 */
			views: {
				lesson: {
					class: LessonEditor,
					instance: null,
					state: 'lesson',
				},
				assignment: {
					class: Assignment,
					instance: null,
					state: 'assignment',
				},
				quiz: {
					class: Quiz,
					instance: null,
					state: 'quiz',
				},
			},

			/**
			 * HTML element selector
			 *
			 * @type  {String}
			 */
			el: '#llms-editor',

			events: {
				'click .llms-editor-nav a[href="#llms-editor-close"]': 'close_editor',
				'click .llms-editor-nav a:not([href="#llms-editor-close"])': 'switch_tab',
			},

			/**
			 * Wrapper Tag name
			 *
			 * @type  {String}
			 */
			tagName: 'div',

			/**
			 * Get the underscore template
			 *
			 * @type  {[type]}
			 */
			template: wp.template( 'llms-editor-template' ),

			/**
			 * Initialization callback func (renders the element on screen)
			 *
			 * @return   void
			 * @since    3.16.0
			 * @version  3.16.0
			 */
			initialize: function( data ) {

				this.SidebarView = data.SidebarView;
				if ( data.tab ) {
					this.state = data.tab;
				}

			},

			/**
			 * Compiles the template and renders the view
			 *
			 * @return   self (for chaining)
			 * @since    3.16.0
			 * @version  3.16.0
			 */
			render: function( view_data ) {

				view_data = view_data || {};

				this.$el.html( this.template( this ) );

				this.render_subviews( _.extend( view_data, {
					lesson: this.model,
				} ) );

				return this;

			},

			/**
			 * Click event for close sidebar editor button
			 * Sends event to main SidebarView to trigger editor closing events
			 *
			 * @param    obj   event  js event obj
			 * @return   void
			 * @since    3.16.0
			 * @version  3.27.0
			 */
			close_editor: function( event ) {

				event.preventDefault();
				Backbone.pubSub.trigger( 'sidebar-editor-close' );
				window.location.hash = '';

			},

			/**
			 * Click event for switching tabs in the editor navigation
			 *
			 * @param    object  event  js event object
			 * @return   void
			 * @since    3.16.0
			 * @version  3.27.0
			 */
			switch_tab: function( event ) {

				event.preventDefault();

				var $btn = $( event.target ),
				view     = $btn.attr( 'data-view' ),
				$tab     = this.$el.find( $btn.attr( 'href' ) );

				this.set_state( view ).render();
				this.set_hash( view );

				// Backbone.pubSub.trigger( 'editor-tab-activated', $btn.attr( 'href' ).substring( 1 ) );
			},

			/**
			 * Adds a hash for deep linking to a specific lesson tab
			 *
			 * @param  string  subtab subtab [quiz|assignment]
			 * @return void
			 * @since   3.27.0
			 * @version 3.27.0
			 */
			set_hash: function( subtab ) {

				var hash = 'lesson:' + this.model.get( 'id' );

				if ( 'lesson' !== subtab ) {
					hash += ':' + subtab;
				}

				window.location.hash = hash;

			},

		}, Subview ) );

} );