eventDispatcher.js

;(function(){
    /**
     * Event dispatcher system
     */
    function EventDispatcher()
    {
        var _listeners = {};

        /**
         * Add listener
         *
         * @param name
         * @param callback
         * @param priority
         */
        this.addListener = function(name, callback, priority)
        {
            if (typeof name == 'undefined') {
                throw new Error('Name event must be specified');
            }

            if (typeof callback != 'function') {
                throw new Error('Callback must be a callable');
            }

            if (typeof priority == 'undefined') {
                priority = 0;
            }

            if (typeof priority != 'number') {
                throw  new Error('Priority must be a number.');
            }

            if (typeof _listeners[name] == 'undefined') {
                _listeners[name] = [];
            }

            _listeners[name].push({
                callback: callback,
                priority: priority
            });
        };

        /**
         * Dispatch
         *
         * @param name
         * @param thisContext
         * @param vars
         */
        this.dispatch = function(name, thisContext, vars)
        {
            if (typeof _listeners[name] == 'undefined') {
                return false;
            }

            var length = _listeners[name].length,
                i = 0;

            for (i = 0; i < length; i++) {
                _listeners[name][i].callback.apply(thisContext, vars);
            }

            return true;
        }
    }

    window.EventDispatcher = EventDispatcher;
})();