'remove' function with an optional argument is very useful actually. Also I
will try calling stopOberving() with just the element.
Thank you all for your replies.
On Sat, Sep 20, 2008 at 7:58 PM, kangax <[EMAIL PROTECTED]> wrote:
>
> On Sep 20, 4:48 am, "Mert Hurturk" <[EMAIL PROTECTED]> wrote:
> > Hi all,
> > I have a question about event observing and memory management.
> >
> > -/ Let's say I have a div element on page. On dom load, my app starts to
> > observe click event on this element: $('demo-div').observe('click',
> > function() { alert('clicked')} );
> > -/ Soon after, I remove this div from dom: $('demo-div').remove();
> >
> > What happens to event handler? Does it still use a segment of memory even
> > the element it is assoicated is removed from dom? Maybe this is not an
> issue
> > with a few elements but with large number of elements in a page, it will
> be
> > a problem.
>
> The event handler remains attached, since `remove` actually returns a
> reference to a removed element. We can not strip event handlers from
> the element that still has references to it, as that would be too
> obtrusive. I believe that's a garbage collector's job anyway. It's
> worth mentioning that a trunk version of prototype calls
> `stopObserving` (on descendant elements) implicitly in `update` method
> (but only for IE). This was meant to prevent memory leaks.
>
> If you don't intend to use an element (or its descendants) after
> removal, it might make sense to strip all of its observers explicitly:
>
> Element.addMethods({
> purgeObservers: function(element) {
> Element.select((element = $(element)),
> '*')._each(Event.stopObserving);
> return element;
> }
> });
>
> someElement.purgeObservers().remove();
>
> It could also make sense to let `remove` accept an optional argument.
> When being truthy, that argument would force `remove` to strip
> observers automatically:
>
> someElement.remove(true); // removes observers
> someElement.remove(); // leaves observes untouched
>
> --
> kangax
> >
>
--
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