Rails - Mar 2006 - Client-side validation in Rails?

We have around 80 forms in our web application. We would like to perform 
some validation checks before the user submits the form. Is there some 
magic provided by Rails to help us achieve this?
The models have validations specified. But I guess they will be executed 
only once the form data is being saved. So that''s not what we are 
looking for.

Thanks,
Yash

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