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Async POST with Sitefinity MVC Widgets

by Stanislav Velikov

There are three modes for working with MVC in Sitefinity. The difference is that Sitefinity’s MVC support allows multiple controllers on a Sitefinity page versus classic MVC using only one controller. This may cause problems when a controller performs a postback and navigates to an action.


  • FirstController has actions Index and IndexPostBack
  • SecondController has actions Load and LoadPostBack

Both controllers are placed on a Sitefinity hybrid page, allowing for MVC widgets and WebForms widgets. FirstController performs a postback, which changes the URL to

SecondController is not rendered on this URL because the action Load is not available for the route


To overcome this, I provide a sample of two MVC widgets performing postbacks asynchronously. Refer to the attached sample for the code.

There are two controllers: the first for creating News and the second for creating Events (CreateNewsController and EventsController).

Upon postback, the controllers create Sitefinity Event/News items.

        public ActionResult Create(CreateNewsModel model)
                var manager = NewsManager.GetManager();
                var newsItem = manager.CreateNewsItem();
                newsItem.Title = model.Title;
                newsItem.Content = model.Content;
                newsItem.Author = model.Author;
                Dictionary<string, string> contextBag = new Dictionary<string, string>();
                WorkflowManager.MessageWorkflow(newsItem.Id, typeof(NewsItem), manager.Provider.Name, "Publish", true, contextBag);
                return Content(MvcHelper.RenderPartialViewToString(this, "_NewsCreated", null));
            return Content(MvcHelper.RenderPartialViewToString(this, "Default", model));

Under normal conditions, the postback redirects to a new route, and in this case, it goes to This hides all other widgets since they are unavailable for this route.

The control handles this redirect to another route by performing an async postback. When creating a news/event item, the result of the postback loads two partial views (_NewsCreated.cshtml and _EventCreated.cshtml) through the MvcHelper class.

public class MvcHelper
        public static string RenderPartialViewToString(Controller controller, string viewName, object model)
            if (string.IsNullOrEmpty(viewName))
                viewName = controller.ControllerContext.RouteData.GetRequiredString("action");
            controller.ViewData.Model = model;
            using (var sw = new StringWriter())
                var viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, viewName);
                var viewContext = new ViewContext(controller.ControllerContext, viewResult.View, controller.ViewData, controller.TempData, sw);
                viewResult.View.Render(viewContext, sw);
                return sw.GetStringBuilder().ToString();

The async postback is performed client-side by the script NewsScript/EventScript.js.

//check if Create ActionResult is called
    function () {
                var model = NewsObject.collectModel();
                NewsObject.sendData(model, "/" + CURRENTPAGE + "/Create", "myNewsForm");
//perform async POST
    sendData: function(newsData, destination, resultHolderId) {
                type: 'POST',
                url: destination,
                contentType: 'application/json; charset=utf-8',
                data: JSON.stringify(newsData),
                success: function (result, args) {
                error: this._syncFailureDelegate

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