events.js

/* eventmodule */
 
/* EventsClass for extend */

var EventModule = function () {}

EventModule.prototype.on = function ( evName, callback ) {
  var _this = this;
  if ( !this._observer ) {
    this._observer = $( {} );
  }
  this._observer.on( evName, function () {
    var args = arguments;
    callback.apply( _this._observer, args );
  } );
  return this;
};

EventModule.prototype.one = function ( evName, callback ) {
  var _this = this;
  if ( !this._observer ) {
    this._observer = $( {} );
  }
  this._observer.one( evName, function () {
    var args = arguments;
    callback.apply( _this._observer, args );
  } );
  return this;
};

EventModule.prototype.off = function () {
  if ( !!this._observer ) {
    return this;
  }
  this._observer.off.apply( this._observer, arguments );
  return this;
};

EventModule.prototype.trigger = function () {
  if ( !this._observer ) {
    return this;
  }
  this._observer.trigger.apply( this._observer, arguments );
  return this;
};

/* impl */
 
var ConcreteCls = function () {
  // constructor I am.
};
ConcreteCls.prototype = new EventModule();
 
/* do it */
 
var instance = new ConcreteCls;
instance.on( 'foo', function ( e, params ) { alert( params ); } );
instance.trigger( 'foo', { val: 'yes!' } ); // yes!