[OldSchoolJohnny]

Wow; of course there are plenty of reasons why forms require javascript unless you've never coded anything of substance before then yes, in your limited experience no forms require javascript.

If you write even mildly complex business applications with business rules and want a professional and non shitty user experience you absolutely need Javascript, there's no substitute.

If you make simple sign up forms then by all means don't use Javascript.

[chipotle_coyote]

I've written a SaaS system for SOX compliance tracking that ended up being a multiuser, role-based task manager that had to track dependencies between assignees and tasks. Did the application require JavaScript? Yes. But the JS had nothing to do with it being a "complex business application with business rules." If I'd implemented business rules in JavaScript, running on the client, I'd have been exposing the company to lawsuits.

JavaScript doesn't deserve all the hate it gets, but the flip side of that is that it gets most of that hate because of the way developers keep using it.

[davesmith1983]

You can do the logic on Postback. Yes it requires a round trip to the server it it works perfectly fine.