function (arg, classId, callback) {
  var view = inView('.' + classId)
  arg === 'on' ? view.on('enter', callback.enter).on('exit', callback.exit) :
  arg === 'once' ? view.once('enter', callback.enter).once('exit', callback.exit) :
  console.warn('[in-view] event handler not found')
}
function (arg, classId, callback) {
  var view = inView('.' + classId)
  arg === 'on' ? view.on('enter', callback.enter).on('exit', callback.exit) :
  arg === 'once' ? view.once('enter', callback.enter).once('exit', callback.exit) :
  console.warn('[in-view] event handler not found')
}
function ( arg , classId , callback ) { var view = inView ( '.' + classId ) arg === 'on' ? view . on ( 'enter' , callback . enter ) . on ( 'exit' , callback . exit ) : arg === 'once' ? view . once ( 'enter' , callback . enter ) . once ( 'exit' , callback . exit ) : console . warn ( '[in-view] event handler not found' ) }
(arg → string, classId → string, callback → function)
- register inView handler
( arg → string classId → string callback → function ) - register inView handler