How to run a background JavaScript in Phonegap on iPhone - for timer/stopwatch?

Question

My stopwatch script runs flawlessly in the background on Android (counting up the time), but iOS 4.3.2 seems to pause the script. On iOS the stopwatch stops at the time where th

Answer 1

Since setIntervals don't work in the background I'd use a recursive setTimeout instead.
Which means you can't keep track of time with a +=, so you'll need to use a (new Date).getTime(); or Date.now() instead.

this.timer = function myTimer () {
  instance.currentTime = (new Date).getTime();
  instance.doDisplay();
  setTimeout( myTimer, Stopwatch.INCREMENT ); 
}

If the setTimeout doesn't come back to life when the app does it should be simpler to restart.