Question

From the docs, you can pass a body to a tag like this:

#{hello}Bob#{/hello}

and the body can be used via doBody:

Hello #{doBody /}!

but how can you test whether or not a body was provided?

I want to do something like this in the tag:

#{if hasBody()}
    #{doBody /}
#{/if}
#{else}
    &{'pages.' + _arg + '.name'}
#{/else}

Any ideas?

Answer 1

If you want to keep your tag in html / tag format then you can use this syntax

#{if (s = play.templates.JavaExtensions.toString(_body).trim()) != ''}
  it has a body! ${s}
#{/if}
#{else}
  no body!!!!
#{/else}

Your other option is to use fastTags (see this blog post here) . In there you can essentially do the same thing

public static void _myTag(Map<?, ?> args, Closure body, PrintWriter out,  ExecutableTemplate template, int fromLine) {
  String s = JavaExtensions.toString(body);
  if (s.trim() != "" ) {
    //there is a body
  } else {
    // there is no body
  }
}