Rails spinoffs - Dec 2005 - Prototype: correct useage of onComplete with Ajax.PeriodicalUpdater

Hello all,

I know it''s a Prototype question, but I hope someone can tell me what  
I''m doing wrong (I hope Prototype gets documented soon ;-(

Problem: using a onComplete callback with Ajax.PeriodicalUpdater
(using scriptaculous 1.5 with Prototype 1.4)

Works:
function fooBar() {
  Element.hide(''foobar'');
}	

new Ajax.Updater(''buddies-and-locations'',
''/ajax-url'',
		{ asynchronous:true,
	          onComplete: function(request) {fooBar();},
		  onLoading: function(request) {showProgress();},
		  parameters: params
		});

Will not work when using a onComplete callback in the same manner :

	new Ajax.PeriodicalUpdater(''buddies-and-locations'',
''/ajax-url'',
		{
		onComplete: function (request){fooBar()},
		onLoading: function(request){ showProgress()},
		parameters: params,
		asynchronous:true,
		decay:2,
		frequency:20.0
		});

But registering the onComplete using Ajax.Responders DOES work :

Ajax.Responders.register({
   onCreate: function() {
     if($(''buddies-loading-notice'') &&
Ajax.activeRequestCount>0)
       showProgress();
   },
   onComplete: function() {
     if($(''buddies-loading-notice'') &&
Ajax.activeRequestCount==0)
       fooBar();
   }
});

I tried passing the callback in various forms (return function()...,  
this.fooBar().bind(this) etc...)
I worked around the problem using onSuccess in the PeriodicalUpdater  
(is that problematic?)

Is it normal that onComplete callbacks do not work in the  
Ajax.PeriodicalUpdater ?

Thanks alot,

Nicky Peeters