Question

I have this error

XMLHttpRequest cannot load http://localhost:81/Test/Service.svc/SetJSON. Origin http://localhost:1716 is not allowed by Access-Control-Allow-Origin.

when I calls wcf web service using jquery.

$.ajax({
    type: 'POST',
    url: webmethod,
    data: '{"data":"Darshana"}',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (msg) {
        alert(msg.d);
    },
    error: function (e) {
        alert("Unavailable");
    }
});

why is that?

any help. thanx..

Answer 1

I don’t remember how I got this error and when. But, as lots of people having this problem I thought to post what I did.

WCF – IService

[OperationContract]
[WebGet(BodyStyle = WebMessageBodyStyle.Bare,
    RequestFormat = WebMessageFormat.Json,
    ResponseFormat = WebMessageFormat.Json,
    UriTemplate = "SetJSON?data={data}")]
string SetJSON(string data);

WCF – Service

[AspNetCompatibilityRequirements(RequirementsMode = 
    AspNetCompatibilityRequirementsMode.Allowed)]
public class Service : IService
{
    public string SetJSON(string data)
    {
        return data;
    }
}

WCF – web.config

<system.serviceModel>
  <bindings>
    <webHttpBinding>
      <binding name="webHttpBindingWithJsonP"
             crossDomainScriptAccessEnabled="true" />
    </webHttpBinding>
  </bindings>
....

<services>
  <service name="RnDService.Service">
    <endpoint address="" behaviorConfiguration="webHttpBehavior"
        binding="webHttpBinding"
              bindingConfiguration="webHttpBindingWithJsonP"
        contract="RnDService.IService" />
  </service>
</services>

Jquery call

$.ajax({
    type: "GET",
    url: "http://localhost:81/Test/Service.svc/SetJSON?data=" + "{ \"dl\":" + datalist + " }",
    contentType: "application/json; charset=utf-8",
    dataType: "jsonp",
    success: function (data) {
        alert(data.toString());
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
        debugger;
        alert("Error Occured!");
    }
});

not 100% sure what solved my problem. Anyway this will help someone. 🙂