Maintaining scroll position on Treeview

**Bill Crawley** · July 19th, 2007, 10:37 AM

Hi All,

I found this great article on maintaining scroll position

http://www.codeguru.com/csharp/.net/...le.php/c12869/

It works a treat if your not using master pages, but with a master page, it seems not to work. The reason being it wants to place an onload event in the <body> section, but of course there is no <body> section in the pages that use a master page.

I thought I'd be smart and place it in the master page <body> but this didn't work, presumably because the masterpage isn't getting posted back.

Anybody have any ideas how to maintain the scroll position when the treeview is in a container control where the page has a master page?

ASP 2.0

**Ranthalion** · July 19th, 2007, 02:13 PM

You can use the following javascript function to add scripts to the body onload event. Just inject that javascript into your page somewhere... I know this works with IE6, but I haven't tested on any other browsers. Insert a script statement after your treeview something like this

Code:

<script language="javascript">addLoadScript('LoadEvent');</script>

the function:

Code:

  function addLoadScript(script)
  {
	if (window.onload == null)
	{
		window.onload=new Function(script);
	}
	else
	{
	
		var oldscript = window.onload.toString();
		if (oldscript.substring(0,8) == 'function')
		{
			var start = oldscript.indexOf('{');
			var end = oldscript.lastIndexOf('}');
			oldscript = oldscript.substring(start + 1, end);
			oldscript = Trim(oldscript);
			
			if  (oldscript.charAt(oldscript.length - 1) != ';')
			{
				oldscript = oldscript + ';';
			}
			window.onload = new Function(oldscript + script);
		}
	}
}

function Trim(sInString) 
{
	sInString = sInString.replace( /^\s+/g, "" );
	return sInString.replace( /\s+$/g, "" );
}

You can view my thread about scrolling and onload here
http://www.codeguru.com/forum/showthread.php?t=429177

Hope this helps.

-Ranthalion

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