Code snippet for custom wcf service calling from mscrm 2011 form java script:

Call the Custom WCF request in Java Script:

Var xmlhttp = new XMLHttpRequest ();

Retrieve the WCF URL from from “ApplicationConfig” Entity using following method.

Var WcfServiceUrlValue= GetConfigValueByKey (Key Name);

WcfServiceUrlValue=WcfServiceUrlValue.avd_ConfigValue;

xmlhttp.open('POST', WcfServiceUrlValue , false);

//Get the request XML from WCF Test Client or Using Feddler Tool

//Place the Inteface name and Method Name following highlighted text.

xmlhttp.setRequestHeader('SOAPAction', 'http://tempuri.org/IDynamicsPaymentService/UpdateExpiredCheque ');

xmlhttp.setRequestHeader('Content-Type', 'text/xml');

var data = '';

data+='<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">';

data+='<s:Body>';

   data+='UpdateExpiredCheque  xmlns="http://tempuri.org/">';

   data+='<data xmlns:d4p1="http://schemas.datacontract.org/2004/07/ UU.Crm.WCFService.DataContracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">';

       data+='<d4p1:CaseNumber>12345</d4p1:CaseNumber>';

        data+='<d4p1:ChequeAmount>200</d4p1:ChequeAmount>';

        data+='<d4p1:ChequeNumber>23421213</d4p1:ChequeNumber>';

        data+='<d4p1:OriginalPaymentDate>1/10/2012</d4p1:OriginalPaymentDate>';

        data+='<d4p1:OriginalPaymentReference>1234</d4p1:OriginalPaymentReference>';

      data+='</data>';

    data+='</UpdateExpiredCheque>';

  data+='</s:Body>';

  data += '</s:Envelope>';

            xmlhttp.send(data);

            xmlDoc = new ActiveXObject("Microsoft.XMLDOM");

            xmlDoc.async = false;

            xmlDoc.loadXML(xmlhttp.responseXML.xml);

//Check the Response Object  and Retrieve the tag values following way.

if (xmlDoc.xml != "") {

                var Msg;

                var ResponseCollection = xmlDoc.getElementsByTagName("a:ResponseCollection");

                if (ResponseCollection.length > 0) {

                    if (ResponseCollection[0].firstChild != null) {

                        Msg = "Message Severity :" + ResponseCollection[0].firstChild.childNodes[0].nodeTypedValue + '\n';

                        Msg += "Warning :" + ResponseCollection[0].firstChild.childNodes[1].nodeTypedValue;

                        alert(Msg);

                    }

                }

            }