Using Json Script Call a WCF Enable Web service

Using Json Script Call a Web service 

In aspx design page the following code should be written for calling a WCF Service

        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: ServiceFailed// When Service call fails
            });
        }

        function ServiceSucceeded(result) {//When service call is sucessful
            // alert("Service Result: " + JSON.stringify(result.d));// For Service Result type JSON
            document.getElementById('<%=LblMessage.ClientID%>').innerHTML = JSON.stringify(result.d);//To show the out put result in a Lebel
        }

        function ServiceFailed(result) {
            //alert('Service call failed: ' + result.status + '' + result.statusText);
            document.getElementById('<%=Label.ClientID%>').innerHTML = result.status + '' + result.statusText;//To show the out put result in a Label
            varType = null; varUrl = null; varData = null; varContentType = null; varDataType = null; varProcessData = null;
        }


      
        function WebServiceCall(imagedata, FIRData, strSize, FingerID_text) {
                     varType = "POST";
                      varUrl = "Service/00.svc/FunctionNmae"; //(ServerPath/WCF Service name/Function  Name)
                       varData = '{"StrImage":"' + encode64(imagedata) + '","StrFIR":"' + encode64(FIRData) + '","StrSize":"' + strSize + '","FingerID_text":"' + FingerID_text + '"}'; //Parameter Passing to the Service Method
                      varContentType = "application/json; charset=utf-8";
            varDataType = "json";
            varProcessData = true;
            CallService();
        }