Question

My ajax method always returns ServiceFailed although WCF service method returns successfully (I verified by setting breakpoints). The code is shown below. What could be the wrong?

function LoginToServer(name, password) {
    server = "localhost:1706";
    Type = "GET";
    var encodeusername = $.base64.encode(encode_utf8(name.value));
    var encodepwd = encode_utf8(password.value);
    var params = 'username=' + encodeusername + '&password=' + encodepwd + '&clientip=none';
    Url = "http://" + server + "/WCF/Test/TestService.svc/rest/Login?" + params;
    ContentType = "application/json; charset=utf-8";
    DataType = "jsonp";
    ProcessData = true;
    JsonpCallback = "alertResponse",
    method = "Login";
    CallService();
}


function CallService() {
    $.ajax({
        type: Type, //GET or POST or PUT or DELETE verb
        url: Url, // Location of the service
        data: Data, //Data sent to server
        contentType: ContentType, // content type sent to server
        dataType: DataType, //Expected data format from server
        processdata: ProcessData, //True or False
        jsonpCallback: JsonpCallback,
        success: function (msg) {//On Successfull service call
            ServiceSucceeded(msg);
        },
        error: ServiceFailed// When Service call fails
    });

WCF Service method is defined as below:

    [OperationContract]
    [WebGet(ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json,
            UriTemplate = "/Login?username={username}&password={password}&clientip={clientip}")]
    AuthenticationStatus SlideViewerLogin(string username, string password, string clientip);

Thanks.

Answer 1

For cross domain call check this

Calling Cross Domain WCF service using Jquery/JavaScript

For WCF call

there might be some issue with WCF service also have look to this blog post which help you to figure out the error you are facing :

Create REST service with WCF and Consume using jQuery

try to pass the data something as below in json format

var msg2 = { "UserName": "Denny", "Password": "abc123" };
 Data = JSON.stringify(msg2);