Simple event-observer class inspired from the example on: http://api.jquery.com/jQuery.Callbacks/ (needs JQuery 1.7)

observer.coffee

class Observer
   
    actions: {}
    
    init: (id) ->
        action = id && @actions[ id ]
        callbacks = $.Callbacks()
        if not action
            action = 
                notify: callbacks.fireWith,
                register: callbacks.add,
                unregister: callbacks.remove
            @actions[ id ] = action
     
     
    register: (id, callback) ->
        if not @actions[id]
            @init(id)
        @actions[ id ].register(callback)
    
    
    notify: (id, context=window, data=false) ->
        if @actions[id]
            if data
                @actions[id].notify(context, data)
            else
                @actions[id].notify(context)
                
                
  module.exports = Observer