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

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.)

RickAndMSFT · Accepted Answer · 2011-05-06 23:07:25Z

2

See my MSDN article How to: Implement Remote Validation in ASP.NET MVC I use the remote client validation code in the HttpPost Create method to test server side when JavaScript is disabled.

[HttpPost]
    public ActionResult Create(CreateUserModel model) {

        // Verify user name for clients who have JavaScript disabled
        if (_repository.UserExists(model.UserName)) {
            ModelState.AddModelError("UserName", ValidationController.GetAltName(model.UserName, _repository));
            return View("Create", model);
        }

answered May 6, 2011 at 23:07

RickAndMSFT

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Comments

Community · Accepted Answer · 2017-05-23 11:55:35Z

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

edited May 23, 2017 at 11:55

CommunityBot

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answered May 5, 2011 at 23:33

Adam Tuliper

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Adam Tuliper Over a year ago

btw.. I have a sample project for remote validation setup - see: completedevelopment.blogspot.com/2011/08/… note it DOES NOT double check validation on post as is asked in this article, its just a basic demo.

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

It sounds like you have JavaScript disabled, and your Remote Validation fails.

Remote Validation requires JavaScript enabled in the browser. It's using jQuery and an AJAX call to get this done.

The quote from MSDN is exactly what you're observing:

you do not see a validation error

server-side validation is performed when you submit the form

edited Jun 20, 2020 at 9:12

CommunityBot

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answered May 5, 2011 at 22:37

p.campbell

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1 Comment

nacho10f Over a year ago

So then I need to duplicate code to get the server to also enforce this rule?

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