How to bind JSON data to dropdownlist in Asp.net MVC using jQuery

Question

I am trying to bind JSON Data to dropdown list

My Scenario is I want to get data and Bind to dynamic dropdown list,

In Seperate Class, I have used linq to get data like

    public SelectList getProjects()
    {
        IEnumerable<SelectListItem> projectslist = (from proj in res.PROJECTs where proj.IS_DELETED == "N" select proj).AsEnumerable().Select(projt => new SelectListItem() { Text = projt.NAME, Value = projt.ID.ToString() });
        return new SelectList(projectslist, "Value", "Text", PROJ_ID);
    }

In Controller:

ViewBag.ProjectList=(from proj in res.PROJECTs where proj.IS_DELETED == "N" select proj).AsEnumerable().Select(projt => new SelectListItem() { Text = projt.NAME, Value = projt.ID.ToString() });

In View:

    @for (int i = 0; i <2; i++)
    {                                    {
   @Html.DropDownListFor(m => m.GetTimeSheetDetails[i].PROJ_ID, (SelectList)ViewBag.ProjectList, "-- Choose a Project --", new { @class = "ddlProjectvalue" })
    }

Now, I am trying for like if we have three dropdownlist, we select a list item in first dropdown list should not show in second dropdown list, and in third dropdown list should not show both previous selected list items for that i have writtern script like:

     <script>
    $(document).ready(function () {
        $('.ddlProjectvalue').change(function () {
            debugger;
            var selectedValue = $(this).val();
            if (selectedValue != null && selectedValue != '') {
                debugger;
                $.ajax({

                    type: "GET",
                    contentType: "application/json; charset=utf-8",
                    url: "/Employer/GetDDLData?selectedValue="+selectedValue,
                    data: "{}",
                    dataType: "Json",
                    success: function (data) {

                        // first remove the current options if any
                        $('.ddlProjectvalue').find('option').remove();

                        // next iterate thru your object adding each option to the drop down\    
                        $(data).each(function (index, item) { // GETTING ERROR HERE
                            debugger;

                            $('.ddlProjectvalue').append($('<option></option>').val(item.Value).html(item.Text));
                        });
                    },
                    error: function ajaxError(response) {
                    alert(response.status + ' ' + response.statusText);
                }
            });
        }
      });
    });
   </script>

and I am returning JSON Data from Controller:

    public ActionResult GetDDLData(string selectedValue)
    {
        int projectid = Convert.ToInt32(selectedValue);

        IEnumerable<SelectListItem> projectslist = (from proj in db.PROJECTs where proj.IS_DELETED == "N" && proj.ID != projectid select proj).AsEnumerable().Select(projt => new SelectListItem() { Text = projt.NAME, Value = projt.ID.ToString() });
        var result = new SelectList(projectslist, "Value", "Text", tm.PROJ_ID);
        return Json(result, JsonRequestBehavior.AllowGet);
    }

I have tried, but getting Error like

      "Syntax error, Unrecognized Expression"

where I am Doing Wrong , please help me anyone.

Answer 1

This will help you :

$.ajax({
            url: "@Url.Action("GetDDLData","Employer")",
            data: {selectedValue:selectedValue},
            dataType: "json",
            type: "GET",
            error: function () {
                alert(" An error occurred.");
            },
            success: function (data) {
                var optionhtml1 = '<option value="' +
                 0 + '">' + "--Select State--" + '</option>';
                $(".ddlProjectvalue").append(optionhtml1);

                $.each(data, function (i) {

                    var optionhtml = '<option value="' +
                data[i].Value + '">' +data[i].Text + '</option>';
                    $(".ddlProjectvalue").append(optionhtml);
                });
            }
        });