unable to retreive data from WCF service from jquery

ashok kumar

13y1.6k.NET

Hi All,

Iam using an wcf web service to retrieve value from database ,iam calling it from jquery ajax call,the problem is getPollDetails.ModelMake is null or not an object.

aspx code:

var varType;

var varUrl;

var varData;

var varContentType;

var varDataType;

var varProcessData;

//Generic function to call AXMX/WCF Service

function CallService() {

$.ajax({

type: varType, //GET or POST or PUT or DELETE verb

url: varUrl, // Location of the service

data: varData, //Data sent to server

contentType: varContentType, // content type sent to server

dataType: varDataType, //Expected data format from server

processdata: varProcessData, //True or False

success: function (msg) {//On Successfull service call

ServiceSucceeded(msg);

error: alert('not working')// When Service call fails

});

}

//Data Available

function ServiceSucceeded(result) {

$('span[id=lblmakemodels]').text(result.getPollDetails.ModelMake);-->when i keep break point on (result.getPollDetails.ModelMake) value is coming here also.

alert(result.getPollDetails.ModelMake);

}

function PollingDataJSON(selectdata) {

alert(selectdata);

varType = "POST";

varUrl = "../HttpHandler/GetPollingDataService.svc/getPollDetails";

varData = JSON.stringify({

vehicleno: selectdata,

});

varContentType = "application/json; charset=utf-8";

varDataType = "json";

varProcessData = true;

CallService();

}

wcf code:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

[ServiceBehavior(IncludeExceptionDetailInFaults = true)]

[DataContract]

public class GetPollingDataService : IGetPollingDataService

{

[DataMember]

public string ModelMake;

}

public GetPollingDataService getPollDetails(string vehicleno)

{

if (dr.Read() != null)

{

objdet.ModelMake = dr["YearMake"].ToString();

dr.Close();

return objdet;

}

when i keep the break point values is retreiving in objdet.ModelMake.

12 Replies

Know the answer? Post it — somebody with the same question will find it here.

Iftikar Hussain13y ago
Accepted answer
please include this for method

[WebInvoke(Method = "POST",
BodyStyle = WebMessageBodyStyle.WrappedRequest,
ResponseFormat = WebMessageFormat.Json,
RequestFormat = WebMessageFormat.Json)]

Regards,
Iftikar
ashok kumar13y ago
Thanks a Lot Mr.Iftikar it Worked,i was including this in an interface.Thanks a Ton for spending ur valuable Time.
ashok kumar13y ago
Hi the value is coming but if i display it in alert Box its showing undefined, when i move the break point which i showed in the screen shot iam getting Modelmake undefined or null. thats the issue .
Iftikar Hussain13y ago
the value is coming. in which control you like to display the result? share the aspx code

Regards,
Iftikar
ashok kumar13y ago
hi have created an separate classn as u had said,but still iam getting defined pls find the screen shot.
Iftikar Hussain13y ago
then create a separate class like this

public class CarModel
{
public string ModelId {get;set;}
public string ModelMake {get;set;}
}

in your WCF
public CarModel getPollDetails(string vehicleno)
{
CarModel carModel=new CarModel();
if (dr.Read() != null)
{
carModel.ModelId = dr["ModelId"].ToString();
carModel.ModelMake= dr["YearMake"].ToString();
dr.Close();

}
return carModel;
}

in your script

function ServiceSucceeded(result) {
$('span[id=lblmakemodels]').text(result.ModelMake);
alert(result.ModelId);
alert(result.ModelMake);
}

Regards,
Iftikar
ashok kumar13y ago
Hi ,
I need to return multiple values not only "yearmake","Modelid" etc so thats why i returned class objects, and tried to access like object.variable ,Could pls say me is it possible.
Iftikar Hussain13y ago
you need to modify your WCF, you shouldn't return as class object of the same class service

public string getPollDetails(string vehicleno)
{
        string result=string.empty;
        if (dr.Read() != null)
{
result= dr["YearMake"].ToString();
dr.Close();

}
return result;
}

in javascript

function ServiceSucceeded(result) {
$('span[id=lblmakemodels]').text(result);
alert(result);
}

Regards,
Iftikar
ashok kumar13y ago
Hi,
I tried Like this Iam getting Undefined in the Box,But value is showing when i debug.
alert(result.ModelMake);
Iftikar Hussain13y ago
Hi,
Try like this

function ServiceSucceeded(result) {

$('span[id=lblmakemodels]').text(result.ModelMake);
alert(result.ModelMake);

}

Regards,
Iftikar
ashok kumar13y ago
No iam Comfortable only in Asp.net
jidhin tr13y ago
Are you comfortable in Php ?