The Window.onrejectionhandled property is an event handler for processing rejectionhandled events, which are raised when Promises are rejected.
window.addEventListener("rejectionhandled", function(event) { ... });
window.onrejectionhandled = function(event) { ...}; window.onrejectionhandled = function(e) {
console.log(e.reason);
} | Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'onrejectionhandled' in that specification. | Living Standard | Initial definition. |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 49 | No support[1] | No support | No support | No support |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | No support | No support[1] | No support | No support | No support |
[1] Firefox implements the PromiseRejectionEvent interface if you go to about:config and set the dom.promise_rejection_events.enabled pref to true. However, Firefox doesn't yet actually send the unhandledrejection or understand rejectionhandled events.
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https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onrejectionhandled