Custom Attribute in c# to give Custom data-attribute in html

Question

I'd like to be able to make a data attribute in c# for an object in my model. When this is displayed. I'd like the html to render the value in a data attribute within the html itself.

In my head, the code looks similar to this.

public class AffectsAttribute:Attribute
{
    public string[] Departments { get; set; }

}


[EmailAddress]
[Required(ErrorMessage = "Email is required")]
[Affects(Departments = new string[]{"Coaches"})]
public string Email {get; set;}

Then in the html, after being called with razor it would look something like this

@Html.EditorFor(model => model.Email)


<input class="text-box single-line" data-affects="Coaches" data-val="true" data-val-email="The Email field is not a valid e-mail address." data-val-required="Email is required" id="Email" name="Email" type="email"  value="">

I have no clue how to specify that I would like the additional data attribute to be added when the item is rendered on a page. Can anyone help?

@Legends I'd do that so that the developer working on the business layer can point out dependencies between areas, then we can warn users when they update. — LiamHT
– LiamHT, Commented Apr 29, 2015 at 13:48
Because the Business layer, Therefore the models are not in an MVC project. We have seperated the two entirely. — LiamHT
– LiamHT, Commented Apr 29, 2015 at 13:51

beautifulcoder · Accepted Answer · 2015-04-29 13:56:17Z

1

It can be done through the ValidationAttribute. If you inherit this:

public class MyCustomAttribute : ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
    }
}

The GetClientValidationRules is what you are interested in. You return an IEnumerable of attributes you want the client to have.

You can check out this article on CodeProject.

answered Apr 29, 2015 at 13:56

beautifulcoder

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1 Comment

LiamHT Over a year ago

my only problem is that any model data requires me to use the MVC namespace. as my model is situated in a business layer (class library) i do not have that information presently

brduca · Accepted Answer · 2015-04-29 13:57:20Z

0

You'll have to create a new HTML helper to do that. http://www.asp.net/mvc/overview/older-versions-1/views/creating-custom-html-helpers-cs

It's an extension from the HtmlHelper, that creates that. Something like:

  public static class YourExtensions
 {
      public static string YourMethodName(this HtmlHelper helper, string[] paramName)
      {
           return  String.Format("<input data-affects='{0}'>",String.Join(" ", paramName));
      }
 }

answered Apr 29, 2015 at 13:57

brduca

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