Rails - May 2010 - Rails 3: perform controller action upon selecting menu item (UJS?)

In Rails 3, I have a form that has a menu on it.  I would like to
render an area containing text fields within the form differently
depending on what''s selected in the menu.

Prior to Rails 3, one way it appears I could do this is by using
observe_field on the menu and call an action in my controller that
renders the appropriate partial which could then be swapped into a div
in my form.  In Rails 3, I''m not getting any further with this
approach than the following error when I try to display the view the
first time:

undefined method `observe_field''

Am I on the right track, or is there a new and improved, UJS-correct
way of doing this in Rails 3?

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Try this  http://railsforum.com/viewtopic.php?id=37984

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