Merge pull request #4017 from CHItA/ticket/14262

[ticket/14262] Move convertor to controller

* CHItA/ticket/14262:
  [ticket/14262] Add error handling and small CS fixes
  [ticket/14262] Remove converter template duplicate
  [ticket/14262] Fix stage navigation
  [ticket/14262] Move convertor to controller

phpBB/assets/javascript/installer.js

@@ -242,6 +242,22 @@
 		}
 	}
 
+	// Redirects user
+	function redirect(url, use_ajax) {
+		if (use_ajax) {
+			resetPolling();
+
+			var xhReq = createXhrObject();
+			xhReq.open('GET', url, true);
+			xhReq.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
+			xhReq.send();
+
+			startPolling(xhReq);
+		} else {
+			window.location.href = url;
+		}
+	}
+
 	/**
 	 * Parse messages from the response object
 	 *
@@ -308,6 +324,10 @@
 		if (responseObject.hasOwnProperty('refresh')) {
 			refreshRequested = true;
 		}
+
+		if (responseObject.hasOwnProperty('redirect')) {
+			redirect(responseObject.redirect.url, responseObject.redirect.use_ajax);
+		}
 	}
 
 	/**