The onabort read-only property of the AbortSignal interface is an event handler invoked when an abort event fires, i.e. when the fetch requests the signal is communicating with are aborted.


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


In the following snippet, we create a new AbortController object, and get its AbortSignal (available using 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');


DOM Standard (DOM)
# abortsignal-onabort

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See also