[TYPO3-dev] JSeventFunCalls onload executed twice

[Peter Klein]

Hi Christoph.
The way TYPO3 does onload events is ancient, and is not very compatible with 
other scripts that access the onload property.
In my Textarea Widget Extension 
(http://typo3.org/extensions/repository/view/pmktextarea/0.1.2/) I create 
the onload handler directly from JS, like this:

-- cut --

 function addEvent(obj, evType, fn, useCapture) {
  if (obj.addEventListener) {
   obj.addEventListener(evType, fn, useCapture);
   return true;
  } else if (obj.attachEvent) {
   var r = obj.attachEvent("on"+evType, fn);
   return r;
  } else {
   alert('Handler could not be attached');
  }
 }

 function removeEvent(obj, evType, fn, useCapture){
  if (obj.removeEventListener){
   obj.removeEventListener(evType, fn, useCapture);
   return true;
  } else if (obj.detachEvent){
   var r = obj.detachEvent('on' + evType, fn);
   return r;
  } else {
   alert('Handler could not be removed');
  }
 }

addEvent(window, 'load', function() { textarea_init(); }, false);
-- cut --

This adds the function "textarea_init" to the onload handler. You can then 
add more functions (or remeove them) as you see fit.
And it works with other scripts that access the onload property directly 
(like TYPO3)

--
Peter Klein / Umloud Untd.

"Christoph Koehler" <christoph.koehler at gmail.com> wrote in message 
news:mailman.1.1167304187.11808.typo3-dev at lists.netfielders.de...
> Hey there,
>
> I noticed that the JSevent onload adds a onload to the body tag as well as 
> a document.onload to the JS, which I think results in everything that is 
> called to be loaded twice. Might not be too bad for most things, but 
> Google Maps is loaded that way and doing that is not a cheap process.
> Is there any reason for that?
>
> Christoph