Can any desktop browsers detect when the computer resumes from sleep?

javascript sleep
Zak Linder picture Zak Linder · Nov 2, 2010 · Viewed 20.9k times · Source

It would be nice if the computer's 'wake up' event was propagated to the browser and available in the JavaScript API. Does anyone know if anything like this is implemented?

Answer

andrewmu picture andrewmu · Nov 2, 2010

I don't know of any direct method to do this, but one way you could get a good idea of when it happens is to set up a setInterval task that runs, say every 2 seconds, and stores the time it last ran. Then check to see if the last time it ran is very much older than 2 seconds.

var lastTime = (new Date()).getTime();

setInterval(function() {
  var currentTime = (new Date()).getTime();
  if (currentTime > (lastTime + 2000*2)) {  // ignore small delays
    // Probably just woke up!
  }
  lastTime = currentTime;
}, 2000);

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