Prevent form from submitting when using unobtrusive validation in ASP.NET MVC 3?

Client-side validation is never enough. Javascript cannot be counted on to be enabled or correct, plus it can be bypassed by a devious user. But is your client-side validation routine returning a boolean false?

If not, the normal submit action will take place regardless.

Your dataannotations are processed on the server side as well - so you are OK as far as that is concerned. The remote validation attribute is not though. You need a custom validation attribute or need to also check this same routine on the server side.

Extract out your validation call to a general method that you check in your HttpPost action (and if it fails use ModelState. AddError) and also have your remote validation method all this so and you should be good. Remote validation is still a decent client side feature so I wouldn't completely scrap it if you want that functionality.

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