Web/API/WorkerGlobalScope/onclose

ObsoleteThis feature is obsolete.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.

Summary

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.

Syntax

self.onclose = function() { ... };

Example

The following code snippet shows an onclose handler set inside a worker:

self.onclose = function() {
  console.log('Your worker instance has been closed');
}

Specifications

This feature is no longer defined in any specifications.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`onclose` Deprecated'Non-standard'	Chrome Full support 4	Edge Full support 12	Firefox No support 3.5 — 50	IE Full support Yes	Opera Full support 11.5	Safari Full support 4	WebView Android Full support 37	Chrome Android Full support 40	Firefox Android No support 4 — 50	Opera Android Full support Yes	Safari iOS Full support 5.1	Samsung Internet Android Full support 4.0

Legend

Full support: Full support
No support: No support
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.': Deprecated. Not for use in new websites.