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firefox-os

Detect if application has been closed or paused

I'm developing my first FirefoxOS app and I need it to backup some data when the user closes or pauses the app. How can I detect this?

I've tried "window.onunload" but it doesn't seem to work.

Thank you.

Solution

  • You should be able to use page visibility API for background switch.

    document.addEventListener("visibilitychange", function () {
if (document.hidden) {
  console.log("App is hidden");
} else {
  console.log("App has focus");
} });