Webmaster Forum / Browsers / Internet Explorer / August 2005

I would assume that you want an event or notification sent off to your script
when an option item in an element comes into view.  However, since there is
no official onscroll event for a select object, that would make things much
more difficult to do.

What I would suggest is to use DHTML to create your own drop down list in
which you can design your own triggers for it.  Start with a hidden div that
pops open when you click on your object and scan for onscroll changes - do a
little math (based on the height of each text line - use a table with set
heights and absolute font characteristics and the scroll offset) and you
should be able to determine exactly what options are visible within the div
at any point in time - including partial text.

If you're using a mozilla based browser, you'll have to determine the height
of each table row dynamically since font sizes are overridden by the browser.

Hope this helps!

Mike,