score:0
the closest concept of uncoughtexception
in react is called "error boundaries":
https://reactjs.org/docs/error-boundaries.html
these elements will catch any rendering error which happen within their subtree.
within the render
method you can display some kind of "internal error" message.
score:0
react 16 introduced error boundaries via a class component lifecycle method: componentdidcatch
, however there are some caveats that you should read about in the documentation below.
componentdidcatch
/*
* implementation
*/
class errorboundary extends react.component {
constructor(props) {
super(props);
this.state = { haserror: false };
}
componentdidcatch(error, info) {
// display fallback ui
this.setstate({ haserror: true });
// you can also log the error to an error reporting service
logerrortomyservice(error, info);
}
render() {
if (this.state.haserror) {
// you can render any custom fallback ui
return <h1>something went wrong.</h1>;
}
return this.props.children;
}
}
/*
* usage
*/
<errorboundary>
<mywidget />
</errorboundary>
react-error-boundary
however, instead of implementing the above, i'd highly suggest using something like react-error-boundary
from brian vaughn.
it's flexible, allows for error recovery, and doesn't outwardly rely on any react lifecycle methods.
import {errorboundary} from 'react-error-boundary'
const errorfallback = () => <div>something went wrong</div>
const myerrorhandler = (error: error, info: {componentstack: string}) => {
// do something with the error
// e.g. log to an error logging client here
}
const ui = (
<errorboundary fallbackcomponent={errorfallback} onerror={myerrorhandler}>
<componentthatmayerror />
</errorboundary>,
)
Source: stackoverflow.com
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