use attribute validation on multiple checkbox in asp.net mvc application

Question

I have a viewmodel like this :

public UserViewModel
{
  public bool IsBlue { get; set; }
  public bool IsRed { get; set; }
}

And an associated razor view like this :

<td>
    <label for="IsBlue">
        <span>is blue ?</span>
    </label>
</td>
<td>
    <span>@Html.CheckBoxFor(d => d.IsBlue)</span>
</td>
<td>
    <label for="IsRed">
        <span>is red ?</span>
    </label>
</td>
<td>
    <span>@Html.CheckBoxFor(d => d.IsRed)</span>
</td>

I have a problem on the server validation side:

The user can check the first, the second, or both textboxes. My question was how can I use the System.ComponentModel.DataAnnotations to force at least one checkbox to be checked. I was wondering if there was like a required attribute to use on the 2 properties.

Thanks in advance for your help.

There is nothing out of the box that will do this. You would need to write your own validation — user3559349
– user3559349, Commented Jun 8, 2015 at 9:05
In this case, how can I display the error message displayed like in the other validation attribute from my check method — user2443476
– user2443476, Commented Jun 8, 2015 at 9:07
Easiest would be in the POST method, if both are false, add a ModelState error - ModelState.AddModelError("", "You must select at least one") and return the view. The error will be displayed in the @Html.ValidationSummary() — user3559349
– user3559349, Commented Jun 8, 2015 at 9:12

Neel · Accepted Answer · 2015-06-08 09:08:50Z

2

You can create your own cutom validation as below using jQuery :-

$("#form").validate({
    rules: {
        checkbox: { 
        required: 'input[type="checkbox"]:checked',
        minlength: $('input[type="checkbox"]').length();
        }
    },
    messages: {
        checkbox: "Please check at least one checkbox.",
    }
});

answered Jun 8, 2015 at 9:08

Neel

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Mike Debela · Accepted Answer · 2015-06-08 09:08:45Z

1

You may use Fluent Validation

[FluentValidation.Attributes.Validator(typeof(CustomValidator))]
public UserViewModel
{
  public bool IsBlue { get; set; }
  public bool IsRed { get; set; }
}

public class CustomValidator : AbstractValidator<UserViewModel>
{
   public CustomValidator()
   {
    RuleFor(x => x.IsBlue).NotEqual(false)
        .When(t => t.IsRed.Equals(false))
        .WithMessage("You need to select one");
   }
 }

answered Jun 8, 2015 at 9:08

Mike Debela

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