Question

Example is about groupon.com. As we know it say time left for certain products and counts every second. So I can do it with javascript but server side should I update it through Ajax all products left time attribute every second or how to update it in server without AJAX

Anybody knows?
1) Something should update my products timeLeft on server?
I can’t find that something.

Only thing I can do is update them through ajax.

Answer 1

The easiest and best way to do count-downs is client-side. Trying to store and update that kind of information is a huge waste of time, space, and processing.

Basically, your database should have the ending time on it, and that will get sent to the client. Then the client will update every second using javascript:

var timeLeft = product.endTime - currentTime;

Then you can update timeLeft every second.