Question

Using the function storeSessionId() , I retrieved the value of storedSession and assigned to sessionId from the servlet using AJAX.

   var storedSession;
   var sessionId;       

function storeSessionId(){
    try
    {
        xmlhttp.onreadystatechange=function()
        {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                storedSession = xmlhttp.responseText.toString();
                sessionIdValue(storedSession);

            }
        };
        xmlhttp.open("POST","JoinAction?subject="+subject+"&userId="+userId+"&secureKey="+secureKey,true);
        xmlhttp.send();
    }
    catch(err)
    {
        alert(err.description);
    }
}

When I compared the sessionId!=null only my div will be displayed else it cannot be displayed.

But even if I got sessionId==null also, my div was displayed. My div was displayed in both the condition.

function sessionIdValue(storedSession){
    sessionId = storedSession;
    if(sessionId != null && sessionId != "null"){
        document.getElementById("div").style.display="inline";
    }
}

Answer 1

The solution is ,

function trim(stringToTrim) {
    return stringToTrim.replace(/^\s+|\s+$/g, "");
}

I passed the sessionId value in to trim()…

Thanks for all who helped me..