Render a View after an AJAX call in asp.net MVC

Question

I'm trying to load a view after an ajax call. After the ajax call my action method will return a view which is going to be loaded after the call is success.

AJAX I'm using

function PostMethods(url, fname, lname, email) {

var userRegisterViewModel = {
    FirstName: fname,
    LastName: lname,
    Email: email
};
$.ajax({
    type: 'Post',
    dataType: "json",
    url: url,
    contentType: 'application/json',
    data: JSON.stringify(userRegisterViewModel),

//Success and error code

});}

My ajax calling an api method where I'm passing fname, lname and email. Now my api method successfully stores those data to database it will return a View if fails to store data it will return an error message which I can show to user in current view. In the HTML of the current view has an empty <spam> to show the error message.

My Action Method is:

    public ActionResult RegisterAndLogin(UserRegisterViewModel model)
    {
        ActionResult returnNextPage = null;
        bool successToStoreData = SomeMethod(model);
        if (successToStoreData)
        {
            returnNextPage = RedirectToAction(string.Empty, "Home");
        }
        else
        {
            //Text message to show to the user
        }
        return returnNextPage;
    }

What code I should write to do this in AXAJ and action method

Answer 1

AJAX calls stay on the same page so RedirectToAction does not work. You need to modify your controller to return JSON, for example

[HttpPost]
public JsonResult RegisterAndLogin(UserRegisterViewModel model)
{
  bool successToStoreData = SomeMethod(model);
  if (successToStoreData)
  {
    return null; // indicates success
  }
  else
  {
    return Json("Your error message");
  }
}

and modify the AJAX function

$.ajax({
  type: 'Post',
  dataType: "json",
  url: url,
  contentType: 'application/json',
  data: JSON.stringify(userRegisterViewModel),
  success: function(message) {
    if (message) {
      $('yourSpanSelector').text(message); // display the error message in the span tag
    } else {
      window.location.href='/YourController/YourAction' // redirect to another page
    }
  }
})