jqtimer.rb

function Timer(millis, callback, _params) {
    var params = $.extend(_params,{repeat: true,context: this})
    this.interval = millis;
    this.repeat = params.repeat;
    this.context = params.context;
    this.args = params.args;
    this.onTimer = callback;
    this.callback = $.proxy(this._onTimer, this);
    this.single = false;
    this._reqs = 0;
}

Timer.prototype._onTimer = function() {
    this._timer = undefined;
    this.invoke();
    if(!this.single) 
        this._timer = setTimeout(this.callback,this.interval);
}

Timer.prototype.start = function() {
    this.stop();
    this._timer = setTimeout(this.callback,this.interval);
    return this;
}

Timer.prototype.stop = function() {
    if( this._timer) clearTimeout(this._timer);
    this._timer = undefined;
    return this;
}

Timer.prototype.invoke = function() {
    clog(this._reqs,this._inside, !this._inside);
    this._reqs ++;
    try {        
        if( ! this._inside) {
            this._inside = true;
            do {
                this.onTimer.apply(this.context, this.args)
            } while( --this._reqs > 0)
            this._inside = false;
        }
    }
    catch(error) {
        clog('ERROR: Timer invocation:', error);
    }
}

$.fn.timer = function(period, data, callback) {
    var event;
    event.timer = new Timer(period, callback, {context: this, args: event});
    event.data = data;
    return event.timer.start();
}