asp.net mvc 3 - Ajax.BeginForm that can redirect to a new page

Question

I have an @Ajax.BeginForm for my model which has a boolean value (@Html.CheckBoxFor). If this is checked, I want my HttpPost action to redirect to a new page. Otherwise I want it to just continue being an @Ajax.BeginForm and update part of the page.

Here is my HttpPost action (Note: Checkout is the boolean value in my model)

Controller:

    [HttpPost]
    public ActionResult UpdateModel(BasketModel model)
    {
        if (model.Checkout)
        {
            // I want it to redirect to a new page
            return RedirectToAction("Checkout");
        }
        else
        {
            return PartialView("_Updated");
        }
    }

Answer 1

You could use JSON and perform the redirect on the client:

[HttpPost]
public ActionResult UpdateModel(BasketModel model)
{
    if (model.Checkout)
    {
        // return to the client the url to redirect to
        return Json(new { url = Url.Action("Checkout") });
    }
    else
    {
        return PartialView("_Updated");
    }
}

and then:

@using (Ajax.BeginForm("UpdateModel", "MyController", new AjaxOptions { OnSuccess = "onSuccess", UpdateTargetId = "foo" }))
{
    ...
}

and finally:

var onSuccess = function(result) {
    if (result.url) {
        // if the server returned a JSON object containing an url 
        // property we redirect the browser to that url
        window.location.href = result.url;
    }
}