Question

I want to use jQuery.getJSON function in ASP.NET MVC 3.0, so I wrote the code below for test:

    <input id="btn" type="button" />

<script>
        $("#btn").click(function () {
            $.getJSON("/Location/GetData", null, function (data) {
                alert(data);
            });
        });


</script>

and I have a LocationController with below method:

public JsonResult GetData()
        {
            List<int> result = new List<int>(){1, 4, 5};
            return Json(result);
        }

But it doesn’t work!
The GetData method calls, but ‘alert’ is not shown!

Answer 1

You need to tell MVC to allow your JSON action to be called via GETs by changing your return to:

return Json(result, JsonRequestBehavior.AllowGet);

By default (for security reasons) they only allow Json to be requested via POSTs.