Javascript cookie timeout with countdown timer

Question

I want to set a cookie with javascript. Easy enough. Suppose I set it to 15 minutes.

How do I read the countdown timer to show when a cookie expires? And even if they leave the page, I would like it to continue to count, and when they return to the page, it will still count.

Sorry for the poor explanation. But I'm sure it is possible.

thanks

Answer 1

Keep a time stamp of + 15 minutes in a cookie if a cookie does not exist. Write a simple script that checks the difference between the current timestamp and the timestamp every second.

:

// 200 seconds countdown
var countdown = 200; 

//current timestamp
var now   = Date.parse(new Date());

//ready should be stored in your cookie
var ready = Date.parse(new Date (now + countdown  * 1000)); // * 1000 to get ms


//every 1000 ms
setInterval(function()
{
    var sec = ( ready - Date.parse(new Date()) )/1000;
    document.title = sec + " seconds left";

},1000);