Events Class

Events.js

var Events = {
    _topics: {},
    _subUid: -1,

    trigger: function(event, args) {
        if (!this._topics[event]) {
            return false;
        }

        var events = this._topics[event],
            len = events ? events.length : 0;

        while (len--) {
            events[len].callback(event, args);
        }

        return this;
    },

    on: function(event, callback) {
        if (!this._topics[event]) {
            this._topics[event] = [];
        }

        var token = (++this._subUid).toString();
        this._topics[event].push({
            token: token,
            callback: callback
        });

        return token;
    },

    off: function(token) {
        for (var m in this._topics) {
            if (this._topics[m]) {
                for (var i = 0, j = this._topics[m].length; i < j; i ++) {
                    if (this._topics[m][i].token === token) {
                        this._topics[m].splice(i, 1);

                        return token;
                    }
                }
            }
        }

        return this;
    }
};