Trying ot implement AJAX

Question

Hi I am trying to implement AJAx functionality in my JSP page.. It will work to bring or open the callup window when ever any one puts mouse over any image.
Well i am sending an product ID to my servlet and getting response in form of XML text but i am not able to track the response from servlet the command i am using for it is...
var ro;
function createRequestObject(objurl,objurl1)
var url1 = "<%= link("catalog", "catProductDescription", extraParam) %>" ;
document.dataForm.OP.value = "description";
var url = url1 + "&ProdId=" + objurl ;
if(window.XMLHttpRequest)
ro = new XMLHttpRequest();
else if(window.ActiveXObject)
ro = newActiveXObject("Microsoft.XMLHTTP");
ro.open("GET", url, true);
ro.onreadystatechange = handleResponse;
ro.send(null);
function handleResponse()
if(ro.status == 200)
var message = ro.responseXML.getElementsByTagNam("message") [0];
setMessage(message.childNodes[0].nodeValue);
function setMessage(message)
alert(message);
I am trying to send product description from Servlet by using:
     response.setContentType("text/xml");
     response.setHeader("Cache-Control", "no-cache" );
     response.getWriter().write(msProdBean.getDescription());
please try to guide me with proper code.

Answer 1

try this handle response function
function handleResponse()
if(ro.readyState == 4)
        var response = ro.responseText;
        var update = new Array();
         if(response.indexOf('||' != -1))
          update = response.split('||');
          // access the response string from servlet with this variable, update[0];
          // eg: alert(update[0]) ;
        }