Is JavaScript validation bad?

Question

It has been long time since we have been validating our forms using JavaScript. I am sure this must be the case with most other developers.

Question:

What if the

Answer 1

You can make server and client-side validation pretty painless by using a framework that supports both. In the past, for ASP.NET I used the Peter Blum validators:

http://peterblum.com/

With this, you drop the validation controls onto your page, hook them up to the inputs (textboxes, drop down lists etc), and specify the validation properties (minimum length, required, error message etc). When the page runs, the framework spits out equivalent code for both the client (JavaScript) and server (ASP.NET) to perform your validation.

Without such a framework, as other posters have pointed out, validation can be laborious.

I'd be interested to know of anything similar for PHP or other technologies.