Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
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;
});
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
activeWorker | Chrome Full support 40 | Edge Full support ≤79 | Firefox
Full support
44
| IE No support No | Opera Full support 27 | Safari No support No | WebView Android Full support 40 | Chrome Android Full support 40 | Firefox Android Full support 44 | Opera Android Full support 27 | Safari iOS No support No | Samsung Internet Android Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.