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lib/CGI/FormBuilder.pod  view on Meta::CPAN

    <select name="credit_card" onchange="recalc_total();"> ...

    <radio name="credit_card" onclick="recalc_total();"> ...

You get the idea.

=item jsmessage => $string

You can use this to specify your own custom message for the field,
which will be printed if it fails validation. The C<jsmessage>
option affects the JavaScript popup box, and the C<message> option
affects what is printed out if the server-side validation fails.
If C<message> is specified but not C<jsmessage>, then C<message>
will be used for JavaScript as well.

    $form->field(name      => 'cc',
                 label     => 'Credit Card',
                 message   => 'Invalid credit card number',
                 jsmessage => 'The card number in "%s" is invalid');

The C<%s> will be filled in with the field's C<label>.