Problem with remote validation in asp.net mvc 3

Question

I have a Person Model

public class Person
    {

        public int  ID { get; set; }
        [Required]
        [Remote("UserNameExists", "People", "Username is already taken.")]
        public string Name { get; set; }
        [Required]
        public string LastName { get; set; }



    }

This is my UserNameExists method

public JsonResult UserNameExists(string name)
        {
            bool exists = personRepository.GetPersonByName(name.Trim());
            if (!exists)
                return Json(true, JsonRequestBehavior.AllowGet);

            return Json(string.Format("{0} is not avavfddvilable.", name),
                    JsonRequestBehavior.AllowGet);
        }

When I have Javascript enabled it works just fine but when I disable javascript this rule is not enforced...

Why is this?

Please Help.

Edit for expected behavior:

According to msdn it should respect this rule even without Javacript

1. Optionally, disable client script in your browser, run the page again, and enter data that violates the validation constraints.

As you leave the field that contains the invalid data, you do not see a validation error because scripting is disabled. Because ASP.NET MVC is using unobtrusive JavaScript, you do not see client-side script errors. However, server-side validation is performed when you submit the form. (It is a good practice to test your Web application with a browser that has scripting disabled.)

Answer 1

You must duplicate a validation call on the server - this DOES NOT work as outlined as per my testing. See my post at: DRY Remote Validation in ASP.NET MVC 3