Rails spinoffs - Aug 2005 - draganddrop mousemove event question

I''ve noticed that the update method of every Draggable is called for
each mousemove event while nothing is dragging. I''m wondering what the
reasoning behind this is (vs. attaching the mousemove handler after a
mousedown event). Does it have a noticeable performance impact when
there are lots of draggables (say 400)?

Disclaimer: I''m really new to JavaScript and may have missed some
fundamental facts about event handling with closures.

Cathy

Thanks for your input! You''re not mistaken here, it seems. I did a  
few tests and it seems faster, especially in Firefox where drag and  
drop has some performance problems (due to the Firefox JavaScript/DOM  
implementation which is notably slower than, say, Safari or IE).

Should be in SVN today.

Thomas

Am 25.08.2005 um 01:54 schrieb EventListener:
> I''ve noticed that the update method of every Draggable is called
for
> each mousemove event while nothing is dragging. I''m wondering what
the
> reasoning behind this is (vs. attaching the mousemove handler after a
> mousedown event). Does it have a noticeable performance impact when
> there are lots of draggables (say 400)?
>
> Disclaimer: I''m really new to JavaScript and may have missed some
> fundamental facts about event handling with closures.
>
> Cathy
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