Html5 Placeholders with .NET MVC 3 Razor EditorFor extension?

Is there a way to write the Html5 placeholder using @Html.EditorFor, or should I just use the TextBoxFor extension i.e.

@Html.TextBoxFor(model => model.Title, new { @placeholder = "Enter title here"})

Or would it make sense to write our own custom extension that can maybe use the 'Description' display attribute via DataAnnotations (similar to this)?

Of course, then the same question applies to 'autofocus' as well.

You may take a look at the following article for writing a custom DataAnnotationsModelMetadataProvider.

And here's another, more ASP.NET MVC 3ish way to proceed involving the newly introduced IMetadataAware interface.

Start by creating a custom attribute implementing this interface:

public class PlaceHolderAttribute : Attribute, IMetadataAware
{
    private readonly string _placeholder;
    public PlaceHolderAttribute(string placeholder)
    {
        _placeholder = placeholder;
    }

    public void OnMetadataCreated(ModelMetadata metadata)
    {
        metadata.AdditionalValues["placeholder"] = _placeholder;
    }
}

And then decorate your model with it:

public class MyViewModel
{
    [PlaceHolder("Enter title here")]
    public string Title { get; set; }
}

Next define a controller:

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

A corresponding view:

@model MyViewModel
@using (Html.BeginForm())
{
    @Html.EditorFor(x => x.Title)
    <input type="submit" value="OK" />
}

And finally the editor template (~/Views/Shared/EditorTemplates/string.cshtml):

@{
    var placeholder = string.Empty;
    if (ViewData.ModelMetadata.AdditionalValues.ContainsKey("placeholder"))
    {
        placeholder = ViewData.ModelMetadata.AdditionalValues["placeholder"] as string;
    }
}
<span>
    @Html.Label(ViewData.ModelMetadata.PropertyName)
    @Html.TextBox("", ViewData.TemplateInfo.FormattedModelValue, new { placeholder = placeholder })
</span>