ajax post request outputting undefined

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I am trying to create a cross domain ajax POST call but when I run the ajax function below, it displays output as 'undefined' instead of the data from the database.

JavaScript

<script type="text/javascript">

    $(document).ready(function () {
        $.support.cors = true;
        $.ajax({
            type: "POST",
            crossDomain: true,
            contentType: "application/json; charset=utf-8",
            url: "home.aspx/BindDatatable",
            data: "{}",
            dataType: "json",
            success: function (data) {
                for (var i = 0; i < data.d.length; i++) {
                    $("#tbDetails").append("<tr><td>" + data.d[i].Name + "</td><td>" + data.d[i].Ln+ "</td><td>" + data.d[i].Events + "</td></tr>");
                }
            },
            error: function (result) {
                alert("Error");
            }
        });
    });

</script>

Updated Server side method:

C#

[WebMethod]
         public static string BindDatatable()
        {
            DataTable dt = new DataTable();
            List<UserDetails> details = new List<UserDetails>();

            using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["######"].ConnectionString))
            {
                using (SqlCommand cmd = new SqlCommand("############", con))
                {
                    con.Open();
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    da.Fill(dt);
                    foreach (DataRow dtrow in dt.Rows)
                    {
                        UserDetails user = new UserDetails();
                        user.Name = dtrow["###"].ToString();
                        user.Ln = dtrow["###"].ToString();
                        user.Events = dtrow["###"].ToString();
                        details.Add(user);
                    }
                }
            }
              JavaScriptSerializer serializer = new JavaScriptSerializer();
             return serializer.Serialize(details);
        }

any help, as to how I can make the above function work. Do I need further define the cross domain headers on my server side, if so, any further examples would be very beneficial.

Thank you

Posted 18-Mar-15 6:02am

miss786

Updated 18-Mar-15 6:27am

v2

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Afzaal Ahmad Zeeshan · Answer 1 · 2015-03-18T06:10:00

That is because the result is an array, that is being return to your client.

C#

List<userdetails> details = new List<userdetails>(); // new generic list

// At the end
return details.ToArray(); // convert to array and send to client
</userdetails></userdetails>

But you're trying to access an array member of this response array; such as a member d of object that is object[]. Which is not valid.

Since there is no member d for data that is returned, that is why it is always showing undefined to you. Try this code, to get the elements from the list itself...

JavaScript

for (var i = 0; i < data.length; i++) {
    $("#tbDetails").append("<table><tbody><tr><td>" + 
                           data[i].Name + "</td><td>" + 
                           data[i].Ln+ "</td><td>" + 
                           data[i].Events + 
                           "</td></tr></tbody></table>");
}

This code would now do the task that you're trying to complete. For more on JavaScript arrays, please refer to following links,

http://javascript.info/tutorial/array[^]
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Indexed_collections[^]