This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The controller read-only property of the ServiceWorkerContainer interface returns a ServiceWorker object if its state is activated (the same object returned by ServiceWorkerRegistration.active). This property returns null if the request is a force refresh (Shift + refresh) or if there is no active worker.
var myController = navigator.serviceWorker.controller;
A ServiceWorker object.
if ('serviceWorker' in navigator) {
// Do a one-off check to see if a service worker's in control.
if (navigator.serviceWorker.controller) {
console.log('This page is currently controlled by:',
navigator.serviceWorker.controller);
} else {
console.log('This page is not currently controlled ' +
'by a service worker.');
}
} else {
console.log('Service workers are not supported.');
} | Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'ServiceWorkerRegistration.controller' in that specification. | Editor's Draft | Initial definition |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 40 | (Yes)[2] | 44.0 (44.0)[1] | No support | 27 | No support |
| Feature | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | 40 | 40 | 44.0 (44.0) | (Yes) | No support | 27 | No support |
[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)
[2] Service workers is available in Microsoft Edge starting EdgeHTML 16 behind a flag.
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/controller