Binding drop down data through jquery and json

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Dear All,

I am getting error when loading the dropdown with jquery and json. but am getting an error like 'length' is null or not an object." So please check my below code, and find what is wrong in it. Please help me with my urgent requirement.

C#

<script language="javascript" type="text/javascript">

        debugger;
        $(document).ready(function () {

            $.ajax({

                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "table.aspx/BindDataToDropDown",
                data: "{}",
                dataType: "Json",
                success: function (data) {
                    $.each(data.d, function (value) {
                        $("[id$='ddl_marks']").append($("<option></option>").val(value.CourseLevelid).html(value.CourseLevel));

                        alert("hellow");
                    });
                }
                                error: function ajaxError(response) {
                                    alert(response.status + ' ' + response.statusText);
                                }


            });
        });
    

    </script>


//code
   <pre lang="c#"> [WebMethod]

    public static CourseDetails[] BindDataToDropDown()
    {


        DataTable dt = new System.Data.DataTable();
        List<coursedetails> List = new List<coursedetails>();
        using (SqlConnection con = new SqlConnection( ConfigurationManager.ConnectionStrings["TESTINGUSER"].ToString()))
        {


            using (SqlCommand cmd = new SqlCommand("Select CourseLevelid,CourseLevel from CourseLevels", con))
            {
                con.Open();
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(dt);

                foreach (DataRow dr in dt.Rows)
                {
                    CourseDetails course = new CourseDetails();
                    course.CourseLevelID = Convert.ToInt32(dt.Rows[0]["CourseLevelid"]);
                    course.CourseLevel = dt.Rows[0]["CourseLevel"].ToString();
                    List.Add(course);
                }
            }

        }

        return List.ToArray();


    }
    public class CourseDetails
    {
        public int CourseLevelID { get; set; }
        public string CourseLevel { get; set; }
    }

</coursedetails></coursedetails>

Posted 7-Oct-13 2:26am

Maria Vinod

Updated 14-Feb-14 20:08pm

Siva Hyderabad

v3

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Comments

TryAndSucceed 7-Oct-13 17:08pm

Why dont you check if you are getting any value back in your jquery? If not, then I think you need to return the List as json value.

Er Daljeet Singh 8-Oct-13 2:49am

There is problem in you javascript so please modified it.I am also posting soultion.

2 solutions

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lakshmi333 · Answer 1 · 2014-02-14T20:06:00

Solution 3

https://umasivaram.wordpress.com/2014/01/24/get-json-result-from-webservice-and-bind-to-dropdownlist-gridview-using-jquery/[^]

Posted 14-Feb-14 20:06pm

lakshmi333

Er Daljeet Singh · Answer 2 · 2013-10-07T20:51:00

This is your script,

XML

<script type="text/javascript">



        function abc()
        {
            $.ajax({
                type: "POST",
                contentType: "application/json; charset=utf-8",
                url: "Webmethod.aspx/BindDataToDropDown",
                data: "{}",
                dataType: "Json",
                success: function (data) {


                    $.each(data.d, function (index, value) {
                        var newOption = $('<option>');
                        newOption.attr('value', index).text(value.CourseLevel);
                        $('#DropDownList1').append(newOption);


                    })
                }
            });
        }
    </script>

Here is your HTML code

XML

<form id="form1" runat="server">
   <input type="button" value="Call" id="btn" name="btn" onclick="abc();" />
   <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
   </asp:ScriptManager>
    <asp:DropDownList ID="DropDownList1" runat="server">
    </asp:DropDownList>
    </form>