How to use HTML-5 data-* attributes in ASP.NET MVC

Question

I am trying to use HTML5 data- attributes in my ASP.NET MVC 1 project. (I am a C# and ASP.NET MVC newbie.)

 <%= Html.ActionLink("« Previous", "Search",
     new { keyword = Model.Keyword, page = Model.currPage - 1},
     new { @class = "prev", data-details = "Some Details"   })%>

The "data-details" in the above htmlAttributes give the following error:

 CS0746: Invalid anonymous type member declarator. Anonymous type members 
  must be declared with a member assignment, simple name or member access.

It works when I use data_details, but I guess it need to be starting with "data-" as per the spec.

My questions:

• Is there any way to get this working and use HTML5 data attributes with Html.ActionLink or similar Html helpers ?
• Is there any other alternative mechanism to attach custom data to an element? This data is to be processed later by JS.

Answer 1

I do not think there are any immediate helpers for achieving this, but I do have two ideas for you to try:

// 1: pass dictionary instead of anonymous object
<%= Html.ActionLink( "back", "Search",
    new { keyword = Model.Keyword, page = Model.currPage - 1},
    new Dictionary<string,string> { {"class","prev"}, {"data-details","yada"} } )%>

// 2: pass custom type decorated with descriptor attributes
public class CustomArgs
{
    public CustomArgs( string className, string dataDetails ) { ... }

    [DisplayName("class")]
    public string Class { get; set; }
    [DisplayName("data-details")]
    public string DataDetails { get; set; }
}

<%= Html.ActionLink( "back", "Search",
    new { keyword = Model.Keyword, page = Model.currPage - 1},
    new CustomArgs( "prev", "yada" ) )%>

Just ideas, haven't tested it.

Answer 2

You can't use them in anonymous classes because - is an operation token in C# (substraction symbol).

You'll need to use, as stated in the other answer, a Dictionary or somesuch.

Answer 3

I ended up using a normal hyperlink along with Url.Action, as in:

<a href='<%= Url.Action("Show", new { controller = "Browse", id = node.Id }) %>'
  data-nodeId='<%= node.Id %>'>
  <%: node.Name %>
</a>

It's uglier, but you've got a little more control over the a tag, which is sometimes useful in heavily AJAXified sites.

HTH