On Jan 8, 2:40 am, Matteo <[email protected]> wrote:
> I noticed that in some examples at developers.apple.com Apple is
> adding event listeners on the fly and removing them as soon as they
> are not required. In the drag-n-drop example they add the touchmove
> and touchend events at the end of the touchstart:
>
> this.element.addEventListener('touchmove', function(e) { return
> self.onTouchMove(e) }, false);
> this.element.addEventListener('touchend', function(e) { return
> self.onTouchEnd(e) }, false);
>
> and they try to remove them on touchend:
>
> this.element.removeEventListener('touchmove',function(e){return
> self.onTouchMove(e)},false);
> this.element.removeEventListener('touchend',function(e){return
> self.onTouchEnd(e)},false);
LOL. That dog don't hunt.
>
> As far as I can tell there's no way to remove an anonymous function
> with removeEventListener. Initially I thought it was a webkit feature
> but it turned out that the events are indeed never removed, so at
> every touchstart two new events are appended (a big memory problem).
Yep. Beware of examples from strangers, regardless of the domain.
>
> a very quick and dummy solution could be to create the event with
> something like:
>
> this.element.addEventListener('touchmove', obj = function(e) { return
> self.onTouchMove(e) }, false);
>
> and remove it with:
>
> this.element.removeEventListener('touchmove', obj, false);
Something like that.
>
> I'm not trying to discredit the examples at developers.apple.com, they
You succeeded in discrediting a bad example. No need to apologize for
that.
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