The Page Visibility API

The Page Visibility API is useful for removing listeners (or stopping background processes) from hidden tabs or pages.

You only have to register a visibilitychange listener:

document.addEventListener('visibilitychange', _ => { 
    const state = document.visibilityState;
    console.log('document is: ',state);

Hiding the page / making it visible again prints:

document is:  hidden
document is:  visible    

See it in action:

See you at "Build to last" effectively progressive applications with webstandards only -- the "no frameworks, no migrations" approach, at Munich Airport, Terminal 2 or (online).

Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition the podcast:

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