MVC3 client validation not working

Question

I have a required annotation on my model:

[Required(ErrorMessage = \"Please choose an option\")]
public bool? AnyDebts { get; set; }

I have

Answer 1

Take a look on this code.

    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public class RequiredIfAttribute : RequiredAttribute
{
    public string PropertyName { get; set; }
    public Enums.BasicOperationType BasicOperationType { get; set; }

    public RequiredIfAttribute(string propertyName, Enums.BasicOperationType BasicOperationType)
    {
        this.PropertyName = propertyName;
        this.BasicOperationType = BasicOperationType;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        Type objectType = validationContext.ObjectType;
        PropertyInfo[] neededProperties = objectType.GetProperties().Where(propertyInfo => propertyInfo.Name == PropertyName).ToArray();
        if (Core.Helpers.EnumHelper.TryParse<Enums.BasicOperationType>(Convert.ToInt16(neededProperties[0].GetValue(validationContext.ObjectInstance, null))) == BasicOperationType)
            return base.IsValid(value, validationContext);

        return base.IsValid(0, validationContext);
    }
}

Answer 2

For my case, it only happens when using IE in quirks mode, my settings are Browser Mode: IE9, Document Mode: Quirks. This results in client side validation not working for me. However, the same page works well in Firefox,Chrome, and IE9, Browser Mode: IE9, Document Mode: IE9 standards when using the developer toolbar. Not that its a solution, but a possible lead

Answer 3

<script src="@Url.Content("~/Scripts/jquery-1.4.4.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>

are the only required scripts for client validation to work.

And as always here's a full working demo:

Model:

public class MyViewModel
{
    [Required(ErrorMessage = "Please choose an option")]
    public bool? AnyDebts { get; set; }
}

Controller:

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View(new MyViewModel());
    }

    [HttpPost]
    public ActionResult Index(MyViewModel model)
    {
        return View(model);
    }
}

View:

@model AppName.Models.MyViewModel
@{
    ViewBag.Title = "Home Page";
}
<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>
@using (Html.BeginForm())
{
    <div>Debts</div>
    <span>Yes</span> @Html.RadioButtonFor(x => x.AnyDebts, true)
    <span>No</span> @Html.RadioButtonFor(x => x.AnyDebts, false)

    @Html.ValidationMessageFor(x => x.AnyDebts)
    <input type="submit" value="OK" />
}

Remark: I haven't included jquery-1.4.4.js in my view because it is already referenced in the layout.