Quote:
Originally Posted by WolfShade
Server-side validation is generally best (users can disable javascript - or you can force the form to submit via JavaScript, so if it's disabled the form can't submit.)
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Doing that would prevent those who don't have JavaScript from ever being able to submit the form. Depending on which country your visitors are in and what anti-discrimination laws apply in their country not allowing those without JavaScript to use a form may be illegal and a large fine might result.
There are some groups of disabled people who either use browsers that don't support JavaScript or where enabling JavaScript would make it impossible for them to interact with the page and such people have been known to take legal action when sites discriminate against them by not providing them with a way to interact with the site. There was one case where a large retailer whose site discriminated by requiring JavaScript that was settled out of court for a few million dollars.
Even where your site is unimportant enough to not fall foul of anti-discrimination laws, do you really want to annoy some of your visitors and have them telling all your friends how useless your site is?