What happens to JavaScript execution (settimeout, etc.) when iPhone/Android goes to sleep?

Question

I have a jQuery Mobile web app which targets iOS and Android devices. A component of the application is a background task, which periodically checks for a.) changes to local

Answer 1

You should use the Page Visibility API (MDN) which is supported just about everywhere. It can detect if a page or tab has become visible again and you can then resume your timeouts or carry out some actions.