[Rails] Update multiple fields with onclick

We've all seen the checkout forms with Bill To: and Ship To: I'd like
to have a button that says "Ship to Bill To:" and if we click it, it
copies all the Ship To: fields across such as phone, email, etc.
I've been looking at link_to_function, is that the right path?
I've done observe_fields before but that went to a controller action
whereas here we could get by just copying params[field_values].
Thanks,
David

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