function call() {

    $.ajax({

        type: "POST",

        url: "http://192.168.1.12/service.asmx" + "/GetUserDetails",

        data: " {'deviceid': '123456', 'latitude': '45.23','longitude':'78.45'}",

        contentType: "application/json; charset=utf-8",

        dataType: "json",

        success: function () {

          onSuccess();

        }

        

    });

        }

        function onSuccess() {

            document.write("data send");

      }

       function onError() {

         document.write("data not send");

             }

In the above code "success" method not execute..but data is insert into database..plz help me out what is wrong with this code...