The Window.onunhandledrejection property is an event handler for processing unhandledrejection events, which are raised for unhandled Promise rejections.
window.onunhandledrejection = EventHandler;
An EventHandler or function to call when unhandledrejection events are received by the window. The event handler receives as an input parameter a PromiseRejectionEvent.
This example simply logs unhandled rejections' reason values to the console.
window.onunhandledrejection = function(e) {
console.log(e.reason);
} | Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'onunhandledrejection' 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. Completing the implementation will be addressed in bug 1362272.
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https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onunhandledrejection