Getting undefined json result on calling .ajax method which return json format list<string>

Question

I am getting undefined result instead of list array. Here is my code

      $.ajax({
                type: "POST",
                url: "DeviceInfo.aspx/GetDeviceValues",
                data: {},
                async:true,
                contentType: "applciation/json; charset=utf-8",
                datatype: "json",
                success: function (msg) { var arr = msg.d; alert(arr); for (var i in arr) { alert(i) } },
                error: function (x, e) {
                    alert("The call to the server side failed. " + x.responseText);
                }             });

Here is the webmethod i am calling

[WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)] 
    public static List<string> GetDeviceValues()
    {
        System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
        List<string> Row = new List<string>();
        Row.Add("First Device ");
        Row.Add("IMEI No Is 22323233");
        Row.Add("UI No is 23232");
        Row.Add("Msg No is 12");
        Row.Add("Active is status is true");
        Row.Add("InActive status is false");
        return Row;

    }

When i see the msg.d or msg value it showing as undefined, what's wrong with my code.

I followed this stackoverflow.com/questions/5364343/… where adding [ScriptMethod(ResponseFormat = ResponseFormat.Json)] will automatically return result as json format — Sekhar Babu
– Sekhar Babu, Commented Nov 22, 2013 at 5:41
Use something like FireBug to monitor the network requests, so you can see exactly what is being returned from the web service - if you're getting undefined back, your web service may be generating an error. I list to wrap lists like this up in an object, along with a boolean success/failure flag and an error message string. Wrap the guts of the web service in a try/catch loop, and in the catch block set the success flag to false, and set the returned objects error message to the exceptions error message. — John - Not A Number
– John - Not A Number, Commented Dec 7, 2013 at 1:03

Neel · Accepted Answer · 2013-11-22 05:35:55Z

0

try to use

$.each(result, function (index, item) {
    ////try something in alert(item.d);
});

and modify your error to look like this to fetch more specify error

error: function(XMLHttpRequest, textStatus, errorThrown){
alert(errorThrown);
}

answered Nov 22, 2013 at 5:35

Neel

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