Cascading Drop Down Selection Lists are when the value of a second
drop down are filtered based on the values a first field (usually a
drop down, but could be a radio box, check box or even text)
Select a Country and then State or Province; or Select a Car
Manufacture and then a Car Model.
This time of feature is has also been called Related Drop Down fields
or Dependant Drop Down lists or Dynamic Drop Downs or Dependent Drop
I've posted code and discussion over at
The code is built and Tested with Ruby on Rails 2.3.5 and jQuery
Hope you find this useful. feedback welcome.