CODEWITHSUNDEEP
c#asp.net-mvc
ViVi
ViVi

Reputation: 4464

Redirect to action with JsonResult

I have a view. When user clicks on a button in my view, I am trying to get some data from my view without reloading my view through an AJAX POST to display some data.

This is the method in my controller :

[HttpPost]
public JsonResult GetUserTraj()
{
    var userTrajList =
        DBManager.Instance.GetUserTraj(Session["UserName"].ToString());
    return Json(userTrajList);
}

This returns a Json Result. I am trying to implement session now. So if the session has expired, I want user to be redirected to the Login view. In the above case if the session expires Session["UserName"] becomes null and an exception is raised.

[HttpPost]
public JsonResult GetUserTraj()
{
    if (Session["UserName"] != null)
    {
        var userTrajList =
            DBManager.Instance.GetUserTraj(Session["UserName"].ToString());
        return Json(userTrajList);
    }
    else
    {
        RedirectToAction("Login", "Login");
        return Json(null);
    }
}

I tried the above code. But it doesn't work. It does not redirect the user to the Login view. I tried return RedirectToAction("Login", "Login");. But that doesn't work since the controller action method cannot return something other than JsonResult. Please help me find a solution for the same.

Upvotes: 8

Views: 33538

Answers (4)

MITHUN M
MITHUN M

Reputation: 1

Controller

This is a common function may used as a generic one as you wish

 public void logoutJson()
     {
        Response.StatusCode = (int)HttpStatusCode.BadRequest; //Send Error Status to Ajax call
        Response.StatusDescription = Url.Action("Index", "Account"); //Url you want to redirect
     }

Script

Just paste this code in the View Pages you want to use it. So it will automatically handle All AJAX calls you wanted.

  $(document).ready(function () {
        $.ajaxSetup({
            'complete': function (xhr, textStatus) {
               if (xhr.status!="200") {
                    window.location.replace(xhr.statusText); //Redirect to URL placed in Response.StatusDescription
                }
            }
        });

    });

Example

Just call the function for manually fail the AJAX Request and the script in client side handle to redirect to login page.

 public JsonResult TestAction()
    {
        if (null == Session["EmpId"]) 
          {
            logoutJson(); //Just call the function 
          }
    }

Upvotes: 0

Rwing
Rwing

Reputation: 490

If you use AJAX to request a page, it's cant redirect in browser. You should response a status code, and then use javascript to redirect in front, like this

[HttpPost]
public JsonResult GetUserTraj()
{
    if (Session["UserName"] != null)
    {
        var userTrajList =
            DBManager.Instance.GetUserTraj(Session["UserName"].ToString());
        return Json(userTrajList);
    }
    else
    {
        //RedirectToAction("Login", "Login");
        return Json(new {code=1});
    }
}

You need write this condition Inside of your Ajax success call to reload login screen, 

if(result.code ===1){
    window.location = 'yourloginpage.html'
}

Upvotes: 9

Ankush Jain
Ankush Jain

Reputation: 7049

You can't redirect user to a new page using ajax. For this you have to send some flag at client side and then need to use that flag to identify that session has been expired. Following code will help you:

[HttpPost]
public JsonResult GetUserTraj()
{
    if (Session["UserName"] != null)
    {
        var userTrajList = DBManager.Instance.GetUserTraj(Session["UserName"].ToString());
        return Json(new { Success = true, Data = userTrajList});
    }
    else
    {
        return Json(new { Success = false, Message = "Session Expired"});
    }
}

jQuery

$.ajax({
  url: "any url",
  dataType: '',
  contentType: "------",
  success: function(response){
    if(response.Success){
     // do stuff
    }else{
    window.location.href = "/YourLoginURL.aspx"
    }
  }
});

Upvotes: 4

Ramesh Rajendran
Ramesh Rajendran

Reputation: 38683

Just try it 

[HttpPost]
public ActionResult GetUserTraj()
{
    if (Session["UserName"] != null)
    {
        var userTrajList =
            DBManager.Instance.GetUserTraj(Session["UserName"].ToString());
        return Json(userTrajList);
    }
    else
    {
        RedirectToAction("Login", "Login");
        return Json(null);
    }
}

Edit

also your login action should be return json result, if you wont the page reloading

ActionResult is an abstract class that can have several subtypes.

ActionResult Subtypes

  • ViewResult - Renders a specifed view to the response stream

  • PartialViewResult - Renders a specifed partial view to the response stream

  • EmptyResult - An empty response is returned

  • RedirectResult - Performs an HTTP redirection to a specifed URL

  • RedirectToRouteResult - Performs an HTTP redirection to a URL that is determined by the routing engine, based on given route data

  • JsonResult - Serializes a given ViewData object to JSON format

  • JavaScriptResult - Returns a piece of JavaScript code that can be executed on the client

  • ContentResult - Writes content to the response stream without requiring a view

  • FileContentResult - Returns a file to the client

  • FileStreamResult - Returns a file to the client, which is provided by a Stream

  • FilePathResult - Returns a file to the client

Upvotes: 2

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