Calling an AJAX Enabled WCF Service from jQuery - wcf

Question

I am developing a mobile application using PhoneGap and jQuery Mobile. My aim is to create a web service which will enable the client (mobile) to query against a database.
After some research, I found out that AJAX Enabled Services might be what I was looking for.
So, I began by creating an AJAX-Enabled WCF Service and for now I added only the following method:
[OperationContract]
[WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json)]
public string GetString()
{
return "Hello there";
}
My web.config looks like this:
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.serviceModel>
<behaviors>
<endpointBehaviors>
<behavior name="WebApplication1.MobileServiceAspNetAjaxBehavior">
<enableWebScript />
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"
multipleSiteBindingsEnabled="true" />
<services>
<service name="WebApplication1.MobileService">
<endpoint address="" behaviorConfiguration="WebApplication1.MobileServiceAspNetAjaxBehavior"
binding="webHttpBinding" contract="WebApplication1.MobileService" />
</service>
</services>
</system.serviceModel>
</configuration>
After finishing off this service, I called from the client using the following method:
$.ajax({
type: "POST",
url: "http://localhost:11634/MobileService.svc/GetString",
contentType: "application/json",
data: "{}",
dataType: "json",
success: function (result) {
$("#textbox").text(result);
},
error: function (textStatus) {
alert(textStatus);
}
});
When calling the service, I am getting the following error [object Object]. Can you guide me on what am I doing wrong and whether I am using the right technologies please?

Answer 1

As Tariqulazam rightly points out [Object object] is not an error but a response object. To access the data you could modify your code to read:
success: function (result) {
var data = result.d
$("#textbox").text(data);
},
If you want to see a text-book example the following looks like a good example of jQuery code which consumes a WCF web-service:
Consuming WCF service using jQuery
Hope this helps!

Answer 2

You need to wrap your
$.ajax({ ... })
inside a function call. That way on a specific action it is called.

Answer 3

Since you are not passing parameters, I would change this to a GET call instead and remove the data portion of the ajax call. Also the way you were returning it was in XML format, change the response format to JSON
[OperationContract]
[WebGet(UriTemplate = "/GetString", RequestFormat = WebMessageFormat.Json)]
public string GetString()
{
return "Hello there";
}
$.ajax({
type: "GET",
url: "http://localhost:11634/MobileService.svc/GetString",
contentType: "application/json",
dataType: "json",
success: function (result) {
$("#textbox").text(result);
},
error: function (textStatus) {
alert(textStatus);
}
});