Re: [Rails] Doint something with each field in form as it is entered

On Sat, Jan 30, 2010 at 2:02 PM, Ralph Shnelvar <lists@ruby-forum.com> wrote:
> Is there a callback or some mechanism that will allow me to modify a
> view once a field in a form is finished .... asumming that there are
> multiple fields in a form.
>
> As a silly example, let's say the bacground of the filed is white by
> default ... but once the user goes on to the next field, then make the
> background of that field red if the number of characters in the field is
> even.

Well this would almost certainly have to be done in the browser using
JavaScript so it's not really a Rails question.

Most Rails apps use either the Prototype JavaScript framework (since
that's what the ajax helpers use), although the modern trend seems to
be to use jQuery (and Rails 3 will make changing JavaScript frameworks
much easier).

If you google for

prototype field validation
and
jquery field validation

you'll come up with serveral plugins for both frameworks.

--
Rick DeNatale

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