[Seaside] Field validation?

[Boris Popov]

Morning,

The round of questioning continues. How would I go about doing field
validation nicely? Say, an amount field that contains a valid description of
a numeric amount. I can think of three ways of doing it:

- Client side JavaScript: is there any abstraction model for this in Seaside
or Scriptaculous?
- Server side processing: could validate the fields in the form submit
callback and return back to the form with some feedback
- AJAX: could validate the field on the server as soon as user leaves it,
any good examples of this?

Thanks!

-Boris

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