The AbstractWorker.onerror property of the AbstractWorker interface represents an EventHandler, that is a function to be called when the error event occurs and bubbles through the Worker.

Syntax

myWorker.onerror = function() { ... };

Example

The following code snippet shows creation of a Worker object using the Worker() constructor and setting up of an onerror handler on the resulting object:

var myWorker = new Worker('worker.js');

myWorker.onerror = function() {
  console.log('There is an error with your worker!');
}

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'AbstractWorker.onerror' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 4Edge Full support 12Firefox Full support 3.5IE Full support 10Opera Full support 10.6Safari Full support 4WebView Android Full support 4.4Chrome Android Full support 18Edge Mobile Full support YesFirefox Android Full support 4Opera Android Full support 11.5Safari iOS Full support 5.1Samsung Internet Android Full support Yes

Legend

Full support  
Full support

Cross-origin worker error behaviour

In earlier browser versions, trying to load a cross-origin worker script threw a SecurityError; in newer browsers an error event is thrown instead due to a spec change. Find out more information on how to deal with this in Loading cross-origin worker now fires error event instead of throwing; worker in sandboxed iframe no longer allowed.

See also

Document Tags and Contributors

Last updated by: sideshowbarker,