Passing HTML 5 data attributes to Play! form inputs

Question

I'm working with Java + Play 2.0.4 and I need to pass some "data-" attributes to my input fields like:

@inputDate(
  myform("start"),
  '_showConstraints -> false,
  '_label -> Messages("label.start.date"),
  'data-date-format -> "mm/dd/yyyy"
)

This throws "value - is not a member of Symbol" error.

Answer 1

I don't remember where I saw this but it works:

Symbol("data-date-format") -> "mm/dd/yyyy"