Customizer: Redirect back to referrer. If referrer is a front end page, load that page in the customizer preview. Props nacin, koopersmith. fixes #20877

git-svn-id: https://develop.svn.wordpress.org/trunk@21028 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/js/customize-controls.dev.js

@@ -403,7 +403,8 @@
 		 */
 		initialize: function( params, options ) {
 			var self = this,
-				rscheme = /^https?/;
+				rscheme = /^https?/,
+				url;
 
 			$.extend( this, options || {} );
 
@@ -444,6 +445,9 @@
 			this.container   = api.ensure( params.container );
 			this.allowedUrls = params.allowedUrls;
 
+			url = params.url;
+			delete params.url;
+
 			api.Messenger.prototype.initialize.call( this, params );
 
 			// We're dynamically generating the iframe, so the origin is set
@@ -488,7 +492,10 @@
 				return result ? result : null;
 			});
 
-			// Refresh the preview when the URL is changed.
+			// Set the url.
+			this.url( url );
+
+			// Refresh the preview when the URL is changed (but not yet).
 			this.url.bind( this.refresh );
 
 			this.scroll = 0;
@@ -635,8 +642,11 @@
 			} ) );
 		});
 
-		// Load the preview frame.
-		previewer.refresh();
+		// Check if preview url is valid and load the preview frame.
+		if ( previewer.url() )
+			previewer.refresh();
+		else
+			previewer.url( api.settings.url.home );
 
 		// Save and activated states
 		(function() {