Backbone.Marionette.Callbaks

1.js

// Callbacks
// ---------

// A simple way of managing a collection of callbacks
// and executing them at a later point in time, using jQuery's
// `Deferred` object.
Marionette.Callbacks = function(){
  this.deferred = $.Deferred();
  this.promise = this.deferred.promise();
};

_.extend(Marionette.Callbacks.prototype, {
  
  // Add a callback to be executed. Callbacks added here are
  // guaranteed to execute, even if they are added after the 
  // `run` method is called.
  add: function(callback){
    this.promise.done(function(context, options){
      callback.call(context, options);
    });
  },

  // Run all registered callbacks with the context specified. 
  // Additional callbacks can be added after this has been run 
  // and they will still be executed.
  run: function(context, options){
    this.deferred.resolve(context, options);
  }
});

In jQuery since 1.7 version has been added Callbacks plugin, which internally used in the Deferred. You can simplify the code, if use jQuery's Callbacks object directly.

I modified your gist, to use the Callbacks instead of the Deferred: https://gist.github.com/1761003

Thank you for your libraries for Backbone!