I am working on an ajax chat application, done most of the work but when i tested it on IE (both on IE6 and IE7), found that there is a memory leak. The application works fine on FF. How can i fix this?
I have used ajax in the following way (this is a similar to how i am using ajax in my chat application); incrementer.php file on line # 34 simply prints an incremented value from the session -
<html>
-
<head>
-
<script language="javascript">
-
function getAjaxObject(){
-
try{
-
ajaxRequest = new XMLHttpRequest();
-
} catch (e){
-
// Internet Explorer Browsers
-
try{
-
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
-
} catch (e) {
-
try{
-
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
-
} catch (e){
-
// Something went wrong
-
alert("Your browser doesn't support ajax!");
-
return false;
-
}
-
}
-
}
-
return ajaxRequest;
-
}
-
function startCounting(){
-
var a=getAjaxObject();
-
a.onreadystatechange = function(){
-
if(a.readyState==4){
-
var text=a.responseText;
-
var e=document.getElementById('val');
-
if(e){
-
e.innerHTML=text;
-
}
-
}
-
}
-
a.open("GET", "incrementer.php", true);
-
a.send(null);
-
setTimeout(startCounting,1);
-
}
-
</script>
-
</head>
-
-
<body>
-
<input type="button" value="Send Object" onclick="startCounting()" />
-
<div id="val"> </div>
-
</body>
-
</html>
-
-
10  2559 
1 millisecond is a bit too small, isn't it?
Try using something like IEDrip to detect the leak. It is often caused by circular references, particularly closures - see link.
1 millisecond is a bit too small, isn't it?
Try using something like IEDrip to detect the leak. It is often caused by circular references, particularly closures - see link.
Thanks for your reply. Setting the interval to 1 millisecond i can see quick increase in the use of memory.
I am unable to trace circular reference in my code. If there is any, please point to that & and how can i resolve this
I have found a solution which leads to another problem. The solution is given below, i have got rid of inner function (see line # 38 ). Now there is an error at line# 28 as i have no access to variable 'a' within updateText The problem is how can i access variable 'a' in the updateText function. -
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-
<html xmlns="http://www.w3.org/1999/xhtml">
-
<head>
-
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-
<title>Untitled Document</title>
-
<script language="javascript">
-
var x=0;
-
function getAjaxObject(){
-
try{
-
ajaxRequest = new XMLHttpRequest();
-
} catch (e){
-
// Internet Explorer Browsers
-
try{
-
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
-
} catch (e) {
-
try{
-
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
-
} catch (e){
-
// Something went wrong
-
alert("Your browser doesn't support ajax!");
-
return false;
-
}
-
}
-
}
-
return ajaxRequest;
-
}
-
function updateText(){
-
if(a.readyState==4){
-
var text=a.responseText;
-
var e=document.getElementById('val');
-
if(e){
-
e.innerHTML=text;
-
}
-
}
-
}
-
function startCounting(){
-
var a=getAjaxObject();
-
a.onreadystatechange = updateText;
-
a.open("GET", "incrementer.php", true);
-
a.send(null);
-
setTimeout(startCounting,1);
-
}
-
</script>
-
</head>
-
-
<body>
-
<input type="button" value="Send Object" onclick="startCounting()" />
-
<div id="val"> </div>
-
</body>
-
</html>
-
-
One solution is to make 'a' global. If you don't want to do that, you can use a closure.
One solution is to make 'a' global. If you don't want to do that, you can use a closure.
I can't use global variable and i have no idea how to use a closure. Please give me sample code
Basically creating a function which returns a function, e.g. - function updateText2(a) {
-
return function() {
-
updateText(a);
-
}
-
}
and calling that instead. See this link for an explanation of closures.
I have used closure, but the problem persists. Please see the code below what i am doing wrong -
<html>
-
<head>
-
<script language="javascript">
-
var x=0;
-
function getAjaxObject(){
-
try{
-
ajaxRequest = new XMLHttpRequest();
-
} catch (e){
-
// Internet Explorer Browsers
-
try{
-
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
-
} catch (e) {
-
try{
-
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
-
} catch (e){
-
// Something went wrong
-
alert("Your browser doesn't support ajax!");
-
return false;
-
}
-
}
-
}
-
return ajaxRequest;
-
}
-
function updateText(a){
-
return function(){
-
if(a.readyState==4){
-
var text=a.responseText;
-
var e=document.getElementById('val');
-
if(e){
-
e.innerHTML=text;
-
}
-
}
-
};
-
}
-
function startCounting(){
-
var a=getAjaxObject();
-
var fun1=updateText(a);
-
a.onreadystatechange = fun1;
-
a.open("GET", "incrementer.php", true);
-
a.send(null);
-
setTimeout(startCounting,1);
-
}
-
</script>
-
</head>
-
-
<body>
-
<input type="button" value="Start Counting" onclick="startCounting()" />
-
<div id="val"> </div>
-
</body>
-
</html>
-
-
-
function startCounting(){
-
var a=getAjaxObject();
-
a.onreadystatechange = function(){
-
if(a.readyState==4){
-
var text=a.responseText;
-
var e=document.getElementById('val');
-
if(e){
-
e.innerHTML=text;
-
}
-
a = null;
-
}
-
}
-
a.open("GET", "incrementer.php", true);
-
a.send(null);
-
setTimeout(startCounting,1);
-
}
-
Yes, that works. Great job man, thank you very much
So simple that I didn't think of. Thanks rnd me ;)
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