I use jquery to post to an MVC controller action that returns a table of information. The user of the page triggers this by clicking on various links.

In the event the user decides to click a bunch of these links in quick succession I wanted to cancel any previous ajax request that may not have finished.

I've found that when I do this (although its fine from the client's POV) I will get errors on the web application saying that

"The parameters dictionary contains a null entry for parameter srtCol of non-nullable type 'System.Int32'"

Now the ajax post deffinately passes in all the parameters, and if I don't try and cancel the ajax request it works just fine.

But if I do cancel the request by calling abort() on the XMLHttpRequest object that ajax() returns before it finishes I get the error from ASP.Net MVC.

Example:

//Cancel any pevious request
if (req)
    {
        req.abort();
        req = null;
    }

//Make new request
    req= $.ajax({
          type: 'POST',
          url: "/Myapp/GetTbl",
          data: {srtCol: srt, view: viewID},
          success: OnSuccess,
          error: OnError,
          dataType: "html"
        });

I've noticed this only happen is IE8. In FF it seems to not cuase a problem.

Does anyone know how to cancel an ajax request in IE8 without causing errors for MVC?

Thanks for any help.