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3 Commits
| Author | SHA1 | Date | |
|---|---|---|---|
| 8cc72afd7b | |||
| a520406547 | |||
| 38f7195ed4 |
+31
-97
@@ -1,111 +1,45 @@
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import React from 'react'
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import React, { useMemo, useCallback, useState } from 'react'
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class ErrorBoundary extends React.Component {
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constructor(props) {
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super(props);
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this.state = {hasError: false};
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}
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static getDerivedStateFromError(error) {
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return { hasError: true }
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}
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componentDidCatch(error,info) {
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console.log(error,info);
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}
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handlerReset = () => {
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this.setState({hasError: false});
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}
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render() {
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if (this.state.hasError) {
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return (
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<div>
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<h1>Что то поломалось</h1>
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<button onClick={this.handlerReset}>Повторить</button>
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</div>)
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}
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return this.props.children;
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}
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}
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class AdvancedErrorBoundary extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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hasError: false,
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error: null,
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errorInfo: null
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}
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}
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static getDerivedStateFromError(error) {
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return { hasErorr: true }
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}
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componentDidCatch(error, info) {
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this.setState({
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error: error,
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errorInfo: info
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const TodoItem = React.memo(({ item, onToggle, onDelete }) => {
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console.log(`rendred ${item.id}`);
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return <li>
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{item.name}
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<button onClick={() => onToggle(item.id)}>Done</button>
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<button onClick={() => onDelete(item.id)}>remove</button>
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</li>
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})
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}
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handleReset = () => {
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this.setState({
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hasError:false,
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error: null,
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errorInfo:null
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});
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}
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function ItemList({ items }) {
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render() {
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if(this.state.hasError) {
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console.log('Error');
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const handleToggle = useCallback(id => {
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items.done = true;
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console.log(`Item ${id} done`)
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console.log(id)
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},[]);
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const handleDelete = useCallback(id => {
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items.pop(id);
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},[]);
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return (
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<div>
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<h2>Произошла ошибка</h2>
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<p>Извеняемся, работаем, исправляем. Разработчика привязали к батарее</p>
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<button onClick={this.handleReset}>Попробовать снова</button>
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</div>
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)
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}
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//Если ошибок нет, то рендрим дочерние объекты
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return this.props.children
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}
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}
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function ProblemComponent() {
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const [counter,setCounter] = React.useState(0)
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const handlerClick = () => setCounter(counter + 1)
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React.useEffect(() => {
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if (counter > 5) {
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throw new Error("Ошибка в компоненте");
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}
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},[counter]);
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return (
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<div>
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<h2>Счетчик: {counter}</h2>
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<button onClick={handlerClick}>Прибавить</button>
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</div>
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<>
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<h3>List items</h3>
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{items.map(item => (
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<TodoItem key={item.id} item={item}
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onToggle={handleToggle} onDelete={handleDelete} />
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))}
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</>
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)
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}
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function App() {
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return (
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<>
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<h1>Обработка ошибок в компонентах</h1>
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<ErrorBoundary>
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<ProblemComponent />
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</ErrorBoundary>
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<ErrorBoundary>
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<ProblemComponent />
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</ErrorBoundary>
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<ErrorBoundary>
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<ProblemComponent />
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</ErrorBoundary>
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{/* Добавьте тестовый контент для проверки */}
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<h1>Hello, React!</h1>
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<ItemList items={[
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{id:1,name:'Первый',done:false},
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{id:2,name:'Второй',done:false}
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]} />
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</>
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)
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}
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@@ -4,7 +4,5 @@ import { createRoot } from 'react-dom/client'
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import App from './App.jsx'
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createRoot(document.getElementById('root')).render(
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<StrictMode>
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<App />
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</StrictMode>
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)
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