How can I create an editable combo box in HTML/Javascript?

You can try my implementation of editable combobox http://www.zoonman.com/projects/combobox/

I know this question is already answered, a long time ago, but this is for other people that may end up here and are having trouble finding what they need. I had trouble finding an existing plugin that did exactly what I needed, so I wrote my own jQuery UI plugin to accomplish this task. It's based on the combobox example on the jQuery UI site. Hopefully it might help someone.

https://github.com/tmooney3979/jquery.ui.combify

Here is a script for that: Demo, Source

Or another one which works slightly differently: link removed (site no longer exists)