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The onunhandledrejection property of the WindowEventHandlers mixin is the EventHandler for processing unhandledrejection events. These events are raised for unhandled Promise rejections.
Syntax
window.onunhandledrejection = function;
Value
function is an EventHandler or function to call when unhandledrejection events are received by the window. The event handler receives as an input parameter as a PromiseRejectionEvent.
Examples
This example simply logs unhandled rejections' reason values to the console.
window.onunhandledrejection = function(e) {
console.log(e.reason);
}
Specifications
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'onunhandledrejection' in that specification. |
Living Standard | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
onunhandledrejection | Chrome Full support 49 | Edge ? | Firefox
Partial support
55
| IE No support No | Opera Full support 36 | Safari Full support 11 | WebView Android Full support 49 | Chrome Android Full support 49 | Edge Mobile ? | Firefox Android
Partial support
55
| Opera Android No support No | Safari iOS Full support 11.3 | Samsung Internet Android ? |
Legend
- Full support
- Full support
- Partial support
- Partial support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.