oparts.js

gistfile1.js

var eventualiy = function (that) {
   var registry = {};
   that.fire = function (event) {
      var array, 
            func,
            handler,
            i,
            type = typeof event === 'string' ? event : event.type;
   
      if (registry.hasOwnProperty(type)) {
         array = registry[type];
         for (i = 0; i < array.length; i += 1) {
            handler = array[i];
            
            func = handler.method;
            if (typeof func === 'string') {
               func = this[func];
            }
            func.apply(this, handler.parameters || [event]);
         }
      }
      return this;
   };
   that.on = function(type, method, parameters) {
      var handler = {
         method: method,
         parameters: parameters
      };
      if (registry.hasOwnProperty(type)) {
         registry[type].push(handler);
      } else {
         registry[type] = [handler];
      }
      return this;
   };
   return that;
};