EventEmitter.js

/*
 *  Module Wrapper
 */
(function (base, factory) {

    'use strict';

    // RequireJS
    if (typeof define === 'function' && define.amd) {
        define(factory);

    // CommonJS
    } else if (typeof exports === 'object') {
        module.exports = factory();

    // Global Space
    } else {
        base.EventEmitter = factory();
    }

}(this, function () {

    'use strict';

    /**
     *  Event Emitter
     *  The Emitter Class/Constructor
     */
    function EventEmitter() {

        // Event Storage
        this._events = [];

        /**
         *  On
         *  Registers a private event to fire later
         */
        this.on = function (evt, callback) {
            var e = {};
            e.evt = evt;
            e.callback = callback;
            this._events.push(e);
        };

        /**
         *  Off
         *  Removes event from the event registry
         */
        this.off = function (evt) {
            var events = this._events;
            for (var i = 0; i < events.length; i++) {
                var e = events[i];
                if (e.evt === evt) { events.splice(i, 1); }
            }
        };

        /*
         *  Fire Event
         *  Calls the the appropriate event in the registry
         */
        this.trigger = function (evt, data) {
            var events = this._events;
            for (var i = 0; i < events.length; i++) {
                var e = events[i];
                if (e.evt === evt) {
                    e.callback(data);
                }
            }
        };
    }

    return EventEmitter;
}));