Tiles and on-load events

[andy wix <st...@hotmail.com>]

Hi,

I have a page which I would like frequently reloaded into the browser and 
was going to use javascript.  The issue is that using Tiles I only have the 
on-load event available for the layout.jsp file and I only want one of my 
pages to have this functionality.

Is there a work-around?

Thanks,
Andy

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Re: Tiles and on-load events

[Joe Germuska <Jo...@Germuska.com>]

At 12:37 PM +0000 11/18/04, andy wix wrote:
>Hi,
>
>I have a page which I would like frequently reloaded into the 
>browser and was going to use javascript.  The issue is that using 
>Tiles I only have the on-load event available for the layout.jsp 
>file and I only want one of my pages to have this functionality.
>
>Is there a work-around?

Here is the simplest thing I've found, from Simon Willison:

function addLoadEvent(func) {
   var oldonload = window.onload;
   if (typeof window.onload != 'function') {
     window.onload = func;
   } else {
     window.onload = function() {
       oldonload();
       func();
     }
   }
}

full writeup at: http://www.sitepoint.com/blog-post-view.php?id=171578

It wouldn't be too hard to extend this so that you could use one 
function to add both onload and onunload events, should that be 
valuable.  In this case, you don't even specify an onload attribute 
in your <html> tag.  If you do, it would override anything set using 
this mechanism.

Joe



-- 
Joe Germuska            
Joe@Germuska.com  
http://blog.germuska.com    
"Narrow minds are weapons made for mass destruction"  -The Ex

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RE: Tiles and on-load events

[da...@exemel.co.uk]

I had a similar problem.

I included a piece of Javascript in the main layout which allows pages
to register
script to be run when onload is invoked, then any page in the layout can
add things:

<html>
<head>
<script language="JavaScript">
var onLoadExpressions = new Array();
var onUnLoadExpressions = new Array();

function addOnLoadExpression(expr, checkForDuplicates)
{
  if (checkForDuplicates && findOnLoadExpression(expr))
  {
    return;
  }

  var newExprs = new Array(onLoadExpressions.length + 1);
  var i;
  for (i=0; i<onLoadExpressions.length; i++)
  {
    newExprs[i] = onLoadExpressions[i];
  }
  newExprs[onLoadExpressions.length] = expr;
  onLoadExpressions = newExprs;
}

function addOnUnLoadExpression(expr, checkForDuplicates)
{
  if (checkForDuplicates && findOnUnLoadExpression(expr))
  {
    return;
  }

  var newExprs = new Array(onUnLoadExpressions.length + 1);
  var i;
  for (i=0; i<onUnLoadExpressions.length; i++)
  {
    newExprs[i] = onUnLoadExpressions[i];
  }
  newExprs[onUnLoadExpressions.length] = expr;
  onUnLoadExpressions = newExprs;
}

function findOnLoadExpression(expr)
{
  var exprFound = false;
  var i;
  for (i=0; i<onLoadExpressions.length; i++)
  {
    if (expr == onLoadExpressions[i])
    {
      exprFound = true;
    }
  }
  return exprFound;
}

function findOnUnLoadExpression(expr)
{
  var exprFound = false;
  var i;
  for (i=0; i<onUnLoadExpressions.length; i++)
  {
    if (expr == onUnLoadExpressions[i])
    {
      exprFound = true;
    }
  }
  return exprFound;
}

function documentLoaded()
{
  var i;
  for (i=0; i<onLoadExpressions.length; i++)
  {
    eval(onLoadExpressions[i]);
  }
}

function documentUnLoaded()
{
  var i;
  for (i=0; i<onUnLoadExpressions.length; i++)
  {
    eval(onUnLoadExpressions[i]);
  }
}
</script> 
</head>

<body onload="documentLoaded();" onunload="documentUnLoaded();">
</body>
</html>

then in your jsp just use:

<script>
addOnLoadExpression('alert("hello");', false);
</script>

Dave

> -----Original Message-----
> From: andy wix [mailto:stixwix@hotmail.com] 
> Sent: Donnerstag, 18. November 2004 12:38
> To: user@struts.apache.org
> Subject: Tiles and on-load events
> 
> 
> Hi,
> 
> I have a page which I would like frequently reloaded into the 
> browser and 
> was going to use javascript.  The issue is that using Tiles I 
> only have the 
> on-load event available for the layout.jsp file and I only 
> want one of my 
> pages to have this functionality.
> 
> Is there a work-around?
> 
> Thanks,
> Andy
> 
> _________________________________________________________________
> It's fast, it's easy and it's free. Get MSN Messenger today! 
> http://www.msn.co.uk/messenger
> 
> 
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