InstallEvent.activeWorker

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The activeWorker read-only property of the InstallEvent interface returns the ServiceWorker that is currently actively controlling the page.

This will return null if no active worker is already controlling the page.

Syntax

var myActiveWorker = event.activeWorker

Value

A ServiceWorker object.

Examples

self.addEventListener('install', function(event) {
  var myActiveWorker = event.activeWorker;
});

Specifications

Specification Status Comment
Service Workers
The definition of 'InstallEvent' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 40Edge ? Firefox Full support 44
Notes
Full support 44
Notes
Notes Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR).
IE No support NoOpera Full support 27Safari No support NoWebView Android Full support 40Chrome Android Full support 40Edge Mobile ? Firefox Android Full support 44Opera Android Full support 27Safari iOS No support NoSamsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.

See also

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills, Sebastianz, kscarfone
Last updated by: fscholz,