Beginner issue: Can't get client side validation to work

I can’t get RequiredIf validation in my ASP.NET MVC 5 application to fire on the client (it always posts back to the server).

I added the following to Application_Start

DataAnnotationsModelValidatorProvider.RegisterAdapter(
    typeof(RequiredIfAttribute), typeof(RequiredIfValidator));
DataAnnotationsModelValidatorProvider.RegisterAdapter(
    typeof(AssertThatAttribute), typeof(AssertThatValidator));

and my page contains the script reference to: expressive.annotations.validate.js

I get the correct validation error messages, but it always posts back to the server to get them.

Thanks for any help; I appreciate it.

[jwaliszko]

As your generated scripts section shows, jquery.validate.js and jquery.validate.unobtrusive.js are loaded twice. Remove that redundancy and check then.

[jwaliszko]

Good it works 😃 Regards.