A: 

I also need a similar. but so far I found two plugins for jQuery.

  1. The "Tagger" chrisiufer.com/tagger, but without autocomplete function.

  2. And "Advanced Uses of Auto Complete" http://education.llnl.gov/jquery/adv%5Fauto.lasso

It would be cool if someone could remake it for the Ruby on Rails. :) If you have a ready solution, please put the code!

Vladimir
A: 

Maybe the model_auto_completer will help.

http://agilewebdevelopment.com/plugins/model_auto_completer

Sonny Parlin