Validate checkbox on the client with FluentValidation/MVC 3

Question

I am trying to validate if a check box is checked on the client using FluentValidation. I can\'t figure it our for the life of me.

Can it be done using unobtrusive v

Answer 1

I like the Darin Dimitrov's answer, but if you want to do it quickly, here is my alternative way.

Create an additional property in your model, e.g.:

public bool ValidationTrue { get; set; }

and set its value to true in the model's contructor.

Use it in your view to save the value across the requests:

@Html.HiddenFor(x => x.ValidationTrue)

Now add a validation rule like this:

public class MyViewModelValidator : AbstractValidator
{
    public MyViewModelValidator()
    {
        RuleFor(x => x.ValidationTrue)
            .Equal(true); // check it for security reasons, if someone has edited it in the source of the page

        RuleFor(x => x.HasToBeChecked)
            .Equal(x => x.ValidationTrue) // HasToBeChecked has to have the same value as ValidationTrue (which is always true)
            .WithMessage("Required");
    }
}

That validation is supported by the unobtrusive validator out-of-the-box.