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This feature is obsolete.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 feature is no longer defined in any specifications.
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
onclose | 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.
See also
- The
WorkerGlobalScopeinterface it belongs to.