Jquery AJAX - can't bind data to dropdown - ASP.NET MVC, jquery

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Unable to bind Cascading Dropdowns - jQuery AJAX

What I have tried:

My DB consists of Regions, Divisions & States. My application (ASP.NET MVC) application uses entityframework to bind data to DropDown.

Created Action to bind Regions by default.
Created Action with RegionId as parameter to retrive Divisions

C#

[HttpGet]  
       public JsonResult GetDivisionsByRegions(string regionID = "")  
       {  
           try  
           {  
               List<Division> allDivisions = new List<Division>();  
               int ID = 0;  
               if (int.TryParse(regionID, out ID))  
               {  
                   using (GeoEntities data = new GeoEntities())  
                   {  
                       allDivisions = data.Divisions.Where(div => div.RegionID == ID).OrderBy(div => div.DivisionID).ToList();  
                   }  
               }  
               if (Request.IsAjaxRequest())  
               {  
                   return new JsonResult  
                   {  
                       Data = allDivisions,  
                       JsonRequestBehavior = JsonRequestBehavior.AllowGet  
                   };  
               }  
               else  
               {  
                   return new JsonResult  
                   {  
                       Data = "Invalid Data",  
                       JsonRequestBehavior = JsonRequestBehavior.AllowGet  
                   };  
               }  
           }  
           finally  
           {  
           }  
       }

jQuery AJAX call to GET data from & bind to Dropdown.

JavaScript

<script type="text/javascript">  
    $(document).ready(function () {  
        $('#RegionID').change(function () {  
            var regionID = parseInt($('#RegionID').val());  
            if (!isNaN(regionID)) {  
                var ddDivision = $('#DivisionID');  
                ddDivision.empty();  
                ddDivision.append($("<option></option>").val("").html("Select Division"));  
                $.ajax({  
                    url: "@Url.Action("GetDivisionsByRegions","GetGeoData")",  
                    type: "GET",  
                    data: { regionID: regionID },  
                    dataType: "json",  
                    success: function (data) {  
                        $.each(data, function (i, value) {  
                            ddDivision.append(  
                                $('<option></option>').val(value.DivisionID).html(value.DivisionName)  
                                );  
                        });  
                    },  
                    error: function () {  
                        alert('Sorry!! Error');  
                    }  
  
                });  
              }  
        });  
    });  
</script>

Able to get data from entity.
Error when binding data to Division drop down.(alert shows 'Sorry!! Error').

Please help me out.

Posted 8-Apr-17 19:01pm

CuriousToLearn

Updated 8-Apr-17 21:06pm

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Comments

Karthik_Mahalingam 9-Apr-17 2:17am

Check in chrome console for detailed error

CuriousToLearn 12-Apr-17 12:55pm

Thanks Karthik, for your response. I have already tried looking into browser console but i didn't see any log.

CuriousToLearn 13-Apr-17 12:15pm

Hi Karthik, thanks again.
I have encountered following two exceptions:

The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.

A circular reference was detected while serializing an object of type 'System.Data.Entity.DynamicProxies'

And

context.Configuration.ProxyCreationEnabled = false;

solved the problem.

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Ramesh Kumar Barik · Answer 1 · 2017-04-08T21:05:00

$(document).ready(function () {
$('#RegionID').change(function () {
var regionID = parseInt($('#RegionID').val());
if (!isNaN(regionID)) {
var ddDivision = $('#DivisionID');
ddDivision.empty();
ddDivision.append($("").val("").html("Select Division"));
$.ajax({
url: "@Url.Action("GetDivisionsByRegions","GetGeoData")",
type: "GET",
data: { regionID: regionID },
dataType: "json",
success: function (data) {
$.each(data.d, function (i, value) {
ddDivision.append(
$('').val(value.DivisionID).html(value.DivisionName)
);
});
},
error: function () {
alert('Sorry!! Error');
}

});
}
});
});------------
Check in browser console, The returned object may be in the data.d.
So try data.d in
$.each(data.d, function (i, value) ......