playframework-2.0 - How to add boolean attributes / data-attributes in Play 2.0 templates?

Question

does anybody know how to add boolean attributes like autofocus to scala templates?

Example: autofocus:

<input autofocus />

For now I use:

'autofocus -> "autofocus"

This prints:

<input type="text" autofocus="autofocus" />

And how to add custom data-attributes? Thanks!

Answer 1

使用None，像这样：

@inputText(
  loginForm("username"),
  '_label -> Messages("usernameLabel"),
  'required -> None,
  'autofocus -> None
)

它将输出如下元素：

<input type="text" id="username" name="username" value="" required autofocus>

Answer 2

这行得通，但我（希望）仍然认为在 scala 中应该有更简单的方法！

'autofocus -> "autofocus"