Send data from doPost() in servlet to AJAX

[sid0404]

Hi

I need to send data from my servlet to my html(which contains AJAX), so as per the motivation of the AJAX, this should be done without my webpage reloading / refresh.

my code on the ajax side is something like this:

var xmlHttp = false;
 
function getXMLHttpRequest(val) {
    try{
        xmlHttp = new XMLHttpRequest();
    }catch(err1){
        try{
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch(err2){
            try { xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");}
            catch(err3){ request = null;}
        }
    }
    if (xmlHttp == false) {
        alert("Error creating request object !!");
    }
    else if(xmlHttp != false){
        return xmlHttp;
 
 
    }
}
var xmlhttp = new getXMLObject(); 
 
function ajaxFunction() {
      if(xmlHttp) {
       var value1 = document.getElementById("value1");
       xmlHttp.open("POST","ajax_controlller",true); //getname will be the servlet name
       xmlHttp.onreadystatechange  = handleServerResponse;
       xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
       xmlHttp.send("value1=" + value1.value); //Posting txtname to Servlet
      }
    }
 
function handleServerResponse() {
    if (xmlHttp.readyState == 4) {
         if(xmlHttp.status == 200) {
//           document.myForm.message.innerHTML=xmlHttp.responseText;
 
           alert(xmlHttp.responseText); //Update the HTML Form element
         }
         else {
            alert("Error during AJAX call. Please try again");
         }
       }
    }
 
 

and the servlet (doPost()) looks like this :

 
              if(request.getParameter("value1") != null){
            value = request.getParameter("value1");
        }  
        else  
            value = "";
 
        response.setContentType("text/html");
 
        response.getWriter().write("helllo");
 

I however, do not understand what is wrong, do I need to specify the name of the html file just like we do in case of RequestDispatcher() methods. I dont think that is the case here ?

[acoder]

Since you seem to be having a problem with the servlet, I've moved this thread to the Java forum.

Moderator.