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import React, { useCallback, useContext, useEffect, useRef } from "react"; |
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import { defineMessages, useIntl } from "react-intl"; |
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import { ErrorContext } from "./ErrorContainer"; |
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import Alert from "./H2Components/Alert"; |
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const TOAST_SELF_DISMISS_TIMER = 3500; |
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export const errorMessages = defineMessages({ |
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toastTitle: { |
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id: "errorToast.title", |
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defaultMessage: "Something went wrong!", |
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description: "Title displayed on the Error Toast component.", |
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}, |
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}); |
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/** |
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* Creates a closure which can be called in the future, to conditionally run a callback only if a certain value is unchanged. |
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* |
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* @param pastValue This value is fixed when the closure is initially created. |
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* @param futureValueRef This allows access to a variable which may be changed by the time this closure runs. |
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* @param callback This function will be called if pastValue === futureValueRef.current when this closure runs. |
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*/ |
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function runCallbackIfValueUnchanged<T>( |
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pastValue: T, |
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futureValueRef: React.MutableRefObject<T>, |
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callback: () => void, |
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) { |
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return () => { |
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if (pastValue === futureValueRef.current) { |
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callback(); |
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} |
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}; |
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} |
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export const ErrorToast: React.FC = () => { |
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const intl = useIntl(); |
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const { state, dispatch } = useContext(ErrorContext); |
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const dismiss = useCallback(() => dispatch({ type: "pop" }), [dispatch]); |
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// This toast will render the first error in the queue, if any. |
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const currentError = state.errorQueue.length > 0 ? state.errorQueue[0] : null; |
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// This ref object makes the currently rendered error available to an async closure, dismissCurrentError |
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const currentErrorRef = useRef(currentError); |
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currentErrorRef.current = currentError; |
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useEffect(() => { |
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if (currentError !== null) { |
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// At the end of the timeout, if the current error hasn't been manually dismissed, dismiss it. |
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const dismissCurrentError = runCallbackIfValueUnchanged( |
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currentError, |
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currentErrorRef, |
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dismiss, |
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); |
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setTimeout(dismissCurrentError, TOAST_SELF_DISMISS_TIMER); |
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} |
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}, [currentError, dismiss]); |
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return ( |
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<> |
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{currentError !== null && ( |
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<Alert |
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color="stop" |
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position="toast" |
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data-h2-radius="b(round)" |
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data-h2-padding="b(all, .25)" |
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dismissBtn={ |
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<Alert.DismissBtn onClick={dismiss}> |
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<i className="fa fa-times-circle" /> |
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</Alert.DismissBtn> |
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} |
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> |
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<Alert.Title> |
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<strong>{intl.formatMessage(errorMessages.toastTitle)}</strong> |
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</Alert.Title> |
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<p>{currentError}</p> |
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</Alert> |
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)} |
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</> |
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); |
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}; |
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export default ErrorToast; |
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GCTC-NTGC /
TalentCloud
