Using helper methods to perform Ajax filtering…?

Hi All,

I'm looking to filter a list of items using a created helper method
instead of a controller method. I see that it's possible to
dynamically manipulate a view using prototype helpers from within a
helper. However, I'm not sure how to use a text field in combination
with "observe_field" in order to properly pass the parameter to the
function.

FYI, I'm trying to do all of this in the edit view. I have a drag and
drop list of items that I can associate with the given object but I
want the user to be able to dynamically trim the list of "available
items" in order to make it less unwieldy.

Can someone provide some insight as to how I should go about this?

Best.