MVC4无法使用AJAX调用控制器方法

Question

I have following method in my controller:

public JsonResult GetRights(string ROLE_ID)
        {
            var result = db.APP_RIGHTS_TO_ROLES.Where(r => r.FK_ROLE_ID.ToString() == ROLE_ID).Select(r => r.APP_RIGHTS).ToList();
            return Json(result, JsonRequestBehavior.AllowGet);
        }

this is how I created a dropdownlist

@Html.DropDownList("ddlRoles", new SelectList(ViewBag.Roles, "ROLE_ID", "ROLE_NAME"),"--Select role--", new { onchange = "GetRights(this.value);" })

and finally a javascript snippet for dropdown item change

<script type="text/javascript">
        function GetRights(role_id) {
            $.ajax({
                type: "GET",
                url: '@Url.Action("GetRights")',
                dataType: "json",
                data: { "ROLE_ID" : role_id.toString() }, 
                success: successFunc,
                error: errorFunc
            })
        }

        function successFunc (data) {
            alert("success");
            if (data != null) {
                var vData = data;
            }
        }

        function errorFunc() {
            alert("error");
        };
    </script>

I can see that javascript function is being called while changing selected item but I am not being navigated to method in my controller. Can somebody help me whats wrong in there? Thanks

Answer 1

This is not the way you should perform GET request with AJAX. In GET, parameters have to be passed in url string, so your url parameter in AJAX should look like:

http://someaddress/GetRights?ROLE_ID=sometexthere

You can check in browser console/debugger where do you fire your reqest to. Also you can manually fire the same request from browser, as this is normal GET.

Answer 2

Figured out that now. It was totally stupid me. I did commented out the following:

@Scripts.Render("~/bundles/jqueryval")

But I was not be able to see that :(. Included jquery now and everything seems to be correct. Thanks to everybody for their help