Multiple remote validation attribute in ASP.NET MVC4

Question

I've got a problem that I can't figure how to solve.
I have a remote validation in a model, just like this:

[Required]
[Display(Name = "Social Security Number:")]
[Remote("IsSocialSecurityNumberValid", "Applicant", ErrorMessage = "Invalid.")]
public string SocialSecurityNumber { get; set; }

But there's another validation that I would like to apply, that is:

[Remote("SocialSecurityNumberExists", "Applicant", ErrorMessage = "Already exists.")]

But mvc doesn't let me add two remote attributes. How could I solve that?
Thanks for the help.

Create one "general" remote validation Action, that return the combined result of the IsSocialSecurityNumberValid and SocialSecurityNumberExists methods. — Andrei V
– Andrei V, Commented Dec 2, 2013 at 13:10
But for each case i want a different message... how would i do that? — Giordano Giuliano
– Giordano Giuliano, Commented Dec 2, 2013 at 13:22
I can't think of a simple solution that does not require tinkering with the metadata or some sort of JavaScript manipulation. If a generic "SSN invalid or existing" message is out of the question, you would need to resort to metadata manipulation, which, in controller, is not a thrill... — Andrei V
– Andrei V, Commented Dec 2, 2013 at 13:30
Well, javascript doesn't seems to me a bad approach. So do you think it's a good idea to call the server twice in a javascript function and show the correct validation through two different actions? I had thought about that, but was afraid of doing some "kludge"... — Giordano Giuliano
– Giordano Giuliano, Commented Dec 2, 2013 at 13:48
Why twice? Just call it once (on the "general" remote validation Action) and expect an "error message" as result. Then set it on your property. — Andrei V
– Andrei V, Commented Dec 2, 2013 at 13:54

Lin · Accepted Answer · 2013-12-02 14:00:11Z

13

See below an example:

    [Required]
    [Display(Name = "Social Security Number:")]
    [Remote("ValidSocialSecurityNumber", "Applicant")]
    public string SocialSecurityNumber { get; set; }

Your Action

public JsonResult ValidSocialSecurityNumber([Bind(Prefix = "SocialSecurityNumber ")] string ssn) 
{
    if (!isSocialSecurityNumberValid) 
    {
        return Json("Invalid.", JsonRequestBehavior.AllowGet);
    }
    if (isSocialSecurityNumberExists) 
    {
        return Json("Already exists.", JsonRequestBehavior.AllowGet);
    }
    return Json(true, JsonRequestBehavior.AllowGet);
}

edited Dec 2, 2013 at 14:00

answered Dec 2, 2013 at 13:32

Lin

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6 Comments

Giordano Giuliano Over a year ago

But I think in this case I'm still validating only one of the cases. The additional attribute should be a different one...

Lin Over a year ago

hi @GiordanoGiuliano, I got it know. Let me update my answer.

Lin Over a year ago

Using only one remote validation function, you can return different error messages.

Giordano Giuliano Over a year ago

Oh nice one. Pretty simple. I'm gonna try it and tell you if it works. Thank you very much for the help. I'm still a starter at MVC. ^_^

Lin Over a year ago

No problems. We are all learning. You need to implement isSocialSecurityNumberValid and isSocialSecurityNumberExists before use them. hope it helps.

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