[FIXED-600] 'unloadListeners' is null or not an object

**bt_bruno** · 18 Feb 2010 8:00 AM

Ext version tested:

Ext 3.1.1

Adapter used:

ext

css used:

only default ext-all.css

Browser versions tested against:

IE8

Operating System:

WinXP Pro

Description:

Unload events attached to the body element causes issues with Ext default unload behavior.

It has been noticed in a post at premium area but with no feedback from the user: unloadListeners is null or not an object?

Test Case:

Really simple to simulate. Create this html file, load on IE8 with debugging activated, and hit F5 to reload. I guess in firefox the error occurs too but it bypasses the error notification as it is on unload event.

Code:

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
        <title>Ext Unload Bug</title>
        
		<link rel="stylesheet" type="text/css" href="../../resources/css/ext-all.css"/>
		<script type="text/javascript" src="../../adapter/ext/ext-base-debug.js"></script>
        <script type="text/javascript" src="../../ext-all-debug.js"></script>
		
		
		<script type="text/javascript">
			
			Ext.onReady(function()
			{
				Ext.EventManager.on( Ext.getBody() 	,'unload' ,function()
				{
					//do something
					
				},this)
			});
			
		</script>
		
    </head>
    <body>
    </body>
</html>

Debugging already done:

In ext-base-all.js we can see this on _unload method:
Code:
```
unloadListeners = null;
            Ext.EventManager._unload();
```
First the unloadListeners is clean, and then Ext.EventManager._unload(); is fired. Somewhere on Ext.EventManager._unload(); method chain it calls removeListener(), to remove the unload event attached by us at the body element. That's when unloadListeners is null and the error occours

Possible fix:

clear unloadListeners after call Ext.EventManager._unload();

**Jamie Avins** · 18 Feb 2010 10:57 AM

Fixed in ext-core 144 - 3.1.x and 3.2.x branches.

[FIXED-600] 'unloadListeners' is null or not an object

Thread Tools

Search Thread

Display

[FIXED-600] 'unloadListeners' is null or not an object

[FIXED-600] 'unloadListeners' is null or not an object