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This feature is obsolete.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.
Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The onclose property of the WorkerGlobalScope interface represents an EventHandler to be called when the close event occurs and bubbles through the Worker.
This non-standard event handler was only implemented by a few browsers and has been removed from all or nearly all of them.
self.onclose = function() { ... }; The following code snippet shows an onclose handler set inside a worker:
self.onclose = function() {
console.log('Your worker instance has been closed');
} This feature is no longer defined in any specifications.
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 4 | ? | 3.5 — 50 | Yes | 11.5 | 4 |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | ? | 40 | No | 4 — 50 | Yes | 5.1 | 4.0 |
WorkerGlobalScope interface it belongs to.
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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/WorkerGlobalScope/onclose