Comment acceder a un webservice via du javascript ?

Salut,

Je cherche un moyen a travers une page html d utiliser un web service (c#) grace a du code javascript.

voila ce que j ai code pour acceder a la methode Helloworld du template par defaut de visual studio 2005 pour les webservices. Neanmoins cela ne marche pas. Sauriez vous ce qui cloche ? ou s il y a un meuilleur moyen d acceder a un webservice via du javascript dans une page html ?

Merci d avance pour votre aide.
Arioule.
Code:
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<script type="text/javascript" language="javascript"> 
 
 // variables
 var strMethodName;
 var strSoapContent; 
 
 var soapAction;
 var url;
 var data;
 
 var xmlhttp ;
 
 
 
 
 //var strSoapContent;
//Function to create parameter for WebService method.function 
    function createWSParam()
    {
        strMethodName = 'HelloWorld' ;
        //var strSoapContent = '<countryName>' + count4WSCall + '</ countryName >\n' +  '<boolAsync>' + strCountryName + '</ boolAsync >\n';
        strSoapContent = "" ;   
     }
 
     //Function to create SOAP data packet.function
     function createSOAPData(strMethodName, strSoapContent)
     {
         soapAction = 'http://tempuri.org/' + strMethodName ;
         url = 'http://localhost:1329/MonService/MonService.asmx' ;
         data = '<?xml version=\'1.0\' encoding=\'utf-8\'?>\n'
         +'<soap:Envelope xmlns:xsi=\'http://www.w3.org/2001/XMLSchema-                        instance\' xmlns:xsd=\'http://www.w3.org/2001/XMLSchema\' xmlns:soap=\'http://schemas.xmlsoap.org/soap/envelope/\'>\n'
         + '<soap:Body>\n'
         + '<' + strMethodName + ' xmlns=\'http://tempuri.org/\'>\n'
         + strSoapContent
         + '</' + strMethodName + '>\n'
         + '</soap:Body>\n'
         + '</soap:Envelope>';
     }
 
     //Function to create XMLHttpRequest.function
     function getXmlHttpObject()
     {
        if(window.ActiveXObject)
        {
            try
            {
                xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
            }
            catch (ex)
            {
                xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
            }
         }
         else if (window.XMLHttpRequest)    //For Non-IE
         {
            xmlhttp = new XMLHttpRequest();
         }
     }
 
     //Function to send the SOAP Request.function
     function sendSOAPDataToWebService(xmlhttp, url, data, soapAction)
     {
        xmlhttp.open('POST', url, true);
        xmlhttp.onreadystatechange = processgetSOAPResponseData ;
        xmlhttp.setRequestHeader('Content-Type', 'text/xml');
        xmlhttp.setRequestHeader('SOAPAction', soapAction);
        xmlhttp.send(data);
     }
 
     //Function to process the SOAP Response.function 
     function processgetSOAPResponseData()
     {
         if (xmlhttp.readyState == 4)
         {
             if (xmlhttp.status == 200) // only if "OK"
             {
                try
                {
                    if (window.ActiveXObject)   // code for IE
                    {
                        doc = new ActiveXObject("Microsoft.XMLDOM");
                        doc.async="false";
                        doc.loadXML(xmlhttp.responseText);
                    }
                    else    // code for Mozilla, Firefox, Opera, etc.
                    {
                        var parser=new DOMParser();
                        doc = parser.parseFromString(xmlhttp.responseText,"text/xml");
                    }
                    var rootNode = doc.documentElement;                    // documentElement always represents the root node
                    alert("message : " + rootNode)
                    /*
                    if( rootNode.childNodes[0].childNodes[0].childNodes[0].nodeName == "getCurrentPositionDataResult" )
                    {
                        //Method to process the SOAP data
                        getCurrentPositionData(rootNode) ;
                    }
                    */
                 }
                 catch (ex){}
              }
          }
      }
 
      // main
 
      function init()
      {
          createWSParam();
          createSOAPData(strMethodName, strSoapContent);
          getXmlHttpObject();
          sendSOAPDataToWebService(xmlhttp, url, data, soapAction);
      }       
 
</script> 
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body onload="init()">
<form id="form1" runat="server"> 
<div> 
</div> 
</form> 
</body>
</html>