lazy event implementation with jQuery

eventmodule.coffee

/* lazy eventy implementation with jQuery */

class Module
  on: (evName, callback) ->
    @_observer = $({}) unless @_observer?
    @_observer.on evName, (args...) =>
      args.shift() # we don't want event object
      callback.apply @_observer, args
    @
  one: (evName, callback) ->
    @_observer = $({}) unless @_observer?
    @_observer.one evName, (args...) =>
      args.shift() # we don't want event object
      callback.apply @_observer, args
    @
  off: ->
    return @ if @_observer?
    @_observer.off.apply @_observer, arguments
    @
  trigger: ->
    return @ unless @_observer?
    @_observer.trigger.apply @_observer, arguments
    @

class ConcreteClass extends Module

ev = new ConcreteClass

console.log '===== on ====='

ev.on 'ontest', ->
  console.log 'ontest'
ev.trigger 'ontest'
ev.trigger 'ontest'
ev.trigger 'ontest'
ev.trigger 'ontest'

console.log '===== on with arg ====='

ev.on 'ontest2', (data) ->
  console.log 'ontest2', data
ev.trigger 'ontest2'
ev.trigger 'ontest2', 10
ev.trigger 'ontest2', { val:10 }

console.log '===== one ====='

ev.one 'onetest', ->
  console.log 'onetest'
ev.trigger 'onetest'
ev.trigger 'onetest'
ev.trigger 'onetest'
ev.trigger 'onetest'

console.log '===== one with arg ====='

ev.one 'onetest2', (data) ->
  console.log 'onetest2', data
ev.trigger 'onetest2', { val:10 }
ev.trigger 'onetest2'
ev.trigger 'onetest2', 10