Real time countdown timer that gets updated by user action. Connected to the database. Implementation?

How wou开发者_StackOverflowld i implement such a timer?

Please take a moment to have a look at this countdown timer. http://bigdeal.com (see one of the products)

What would you do with the db. How would you intergrate with javascript?

Thank you

---

First, you have to use an AJAX request to get all the new values.

Then you can repeat this AJAX request using setInterval()

var updateCountdowns = function(){
    $.ajax({
        url: 'get_countdowns.php',
        cache: false,
        dataType: 'json',
        success: function(data) {
             // update your countdowns
        }
    });
};

setInterval(updateCountdowns, 1000); // Repeated every 1000 ms (1 sec)