Controller must either provide JsonResult or redirect to view

问题

I have an ExtJs formpanel with standardSubmit: false. On submit, the controller will validate the formdata since some validation will take place on the server (for example a check if the name is unique). If the provided entity is invalid, a JsonResult is sent to the client to notify the user which fields are invalid. That works perfectly. If the entity is valid, it will be stored in the database and the controller must redirect the user to a specific view.

The result is that the HTML provided by the view is sent to the client which expects a JSON-response. Obviously, this does not work.

public override ActionResult Create(FormCollection formCollection)
    {
        Models.Relatie relatie = Repository.CreateNew();
        SetFormValues(relatie, formCollection);

        if (ModelState.IsValid)
        {
            _relatieService.CreateRelation(relatie);
            ViewResult view = View("Index");
            return view; //pumps html while client expects JSON
        }
        else
        {
            JsonResult json = Json(new { success = false, errors = ModelState.ToDictionary() });
            return json;
        }
    }

I've been looking for a solution for over 8 hours now, can anybody please help me out?

回答1:

Send back a JSON object with the success property set to true. Check this in your success handler on the AJAX call and redirect using javascript ( window.location = indexLink).

Worth noting that if you want to generate the link server-side and you're using the web forms view engine you will need to do something like this to embed a script variable in the page:

<%= "<script language=\"javascript\"> var indexLink = \"" + Url.Action("Index") + "\";</script>" %>

You can then use indexLink in your page.

来源：https://stackoverflow.com/questions/5579860/controller-must-either-provide-jsonresult-or-redirect-to-view