I'm sure this is an anti-pattern, but the empty function is just there to tell pillbox that it's present, since pillbox fires the 'suggest' event to trigger the dropdownup. I looked into seeing if there was a feature detection method to see if the suggest event was present. I think the only way to do this is with a pub/sub/callee statement, but that seemed too heavy for what you we are doing. I'm open to suggestions if you have one about detecting the presence of the dropdownup's 'suggest' event trigger.