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.


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


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!');


Specification Status Comment
WHATWG HTML Living Standard
The definition of 'AbstractWorker.onerror' in that specification.
Living Standard No change from Web Workers.
Web Workers
The definition of 'AbstractWorker.onerror' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 4 3.5 (1.9.1) 10 10.6 4
Feature Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 4.4 1.0 (1.9.1) 1.0.1 10 11.5 5.1

See also

Document Tags and Contributors

 Contributors to this page: fscholz, chrisdavidmills, teoli, tregagnon
 Last updated by: fscholz,