This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 40.0 | 44.0 (44.0)[1] | No support | 24 | No support |
| Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 44.0 (44.0) | (Yes) | No support | ? | No support | 40.0 |
[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)