This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The onabort read-only property of the FetchSignal interface is an event handler Invoked when an abort event fires, i.e. when the fetch request(s) the signal is communicating with is/are aborted.


abortSignal.onabort = function() { ... };


In the following snippet, we create a new AbortController object, and get its AbortSignal (available in the signal property). Later on we check whether or not it the signal has been aborted using the onabort property, and send an appropriate log to the console.

var controller = new AbortController();
var signal = controller.signal;

signal.onabort = function() {
  console.log('Request aborted');


Specification Status Comment
The definition of 'onabort' in that specification.
Living Standard Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support661657 No43 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support6666165743 No ?

See also

Document Tags and Contributors

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