WorkerGlobalScope.onclose

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This feature is obsolete.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.

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 event handler has been removed from the specifications below.

Specification	Status	Comment
WHATWG HTML Living Standard The definition of 'WorkerGlobalScope.onclose' in that specification.	Living Standard	No change from Web Workers.
Web Workers The definition of 'WorkerGlobalScope.onclose' in that specification.	Editor's Draft	Initial definition.

Feature	Chrome	Firefox (Gecko)	Microsoft Edge	Internet Explorer	Opera	Safari
Basic support	4	3.5 (1.9.1) through 50 (50)	?	(Yes)	11.5	4

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	Firefox OS (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	?	40	1.0 (1.9.1) through 50.0 (50)	1.0.1	(Yes)	(Yes)	5.1