Validating a field, preferably with JavaScript

[n3fih]

Does anyone have an easy-to-understand example of how to validate a form field? I assume I can somehow add my JS code to a page somehow, and assign it to a method of the field, somehow, but I'm still getting the hang of this MVC stuff, and I can't quite figure out the "where". Any help would be appreciated.

[n3fih]

OK, I've found the 'customCode' / js solution, but I also found out that onBlur and onChange both have a sneak path on FireFox that allows users to bypass the test if they hit 'Enter'. So I guess what I REALLY need is server-side validation. Let me then rephrase my question; "Can anyone point out an example of doing Server Side validation with Sugar CE?

[eitrix]

take a look at how sugar adds fields for validation, js function addToValidate and reuse it.

Server side validation is not an option.