Rails spinoffs - Apr 2008 - Ajax.Autocompleter selection slows down after 8-or-so selections via mouse in IE6, IE7

We''re using the auto_complete plugin to generate Ajax.Autocomplete
calls.  The way the page works is the user chooses an item from the
autocomplete list, which populates the field with the full text of the
item, and then clicks an ''Add'' button which adds it to a list
elsewhere in the page (and a hidden input) and clears out the
autocompleting field so the user can add more items.

This works fine in Firefox no matter how the user interacts with the
autocomplete box.  In both IE6 and IE7, it''s fine if the user uses the
keyboard to make their selection (i.e., type some characters, arrow
down, Enter or Tab).  However, if the user uses the mouse to choose an
item, it seems fine at first, but gets slower with each selection.
The slowdown seems exponential: it is barely noticeable through the
first few selections; around the seventh or eighth, it becomes
unbearably slow.  We see IE consuming 100 of the CPU while waiting for
the selection to happen.

We put some debugging statements into our code (as we specify an
after_update_element option that we thought might be to blame) as well
as controls.js to try to narrow down where the slowdown is.  All the
slowness is before our afterUpdateElement code is called.  We put
statements into the onClick of Autocompleter.Base and were surprised
to find the slowdown doesn''t seem to be localized to one call: each
line runs very slowly.

Having googled around, we haven''t found any reference to similar
issues.  Has anyone seen anything like this?  Any thoughts on what
might be causing it?

Thanks.
-john.
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Bueller? Bueller? Anyone? Bueller?

-Prasanna

On Apr 30, 2:11 am, "duelin.markers"
<duelin.mark...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> We''re using the auto_complete plugin to generate Ajax.Autocomplete
> calls.  The way the page works is the user chooses an item from the
> autocomplete list, which populates the field with the full text of the
> item, and then clicks an ''Add'' button which adds it to a
list
> elsewhere in the page (and a hidden input) and clears out the
> autocompleting field so the user can add more items.
>
> This works fine in Firefox no matter how the user interacts with the
> autocomplete box.  In both IE6 and IE7, it''s fine if the user uses
the
> keyboard to make their selection (i.e., type some characters, arrow
> down, Enter or Tab).  However, if the user uses the mouse to choose an
> item, it seems fine at first, but gets slower with each selection.
> The slowdown seems exponential: it is barely noticeable through the
> first few selections; around the seventh or eighth, it becomes
> unbearably slow.  We see IE consuming 100 of the CPU while waiting for
> the selection to happen.
>
> We put some debugging statements into our code (as we specify an
> after_update_element option that we thought might be to blame) as well
> as controls.js to try to narrow down where the slowdown is.  All the
> slowness is before our afterUpdateElement code is called.  We put
> statements into the onClick of Autocompleter.Base and were surprised
> to find the slowdown doesn''t seem to be localized to one call:
each
> line runs very slowly.
>
> Having googled around, we haven''t found any reference to similar
> issues.  Has anyone seen anything like this?  Any thoughts on what
> might be causing it?
>
> Thanks.
> -john.
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