å ç¢ã§ãŠãŒã¶ãŒãã¬ã³ããªãŒãªã¢ããªã±ãŒã·ã§ã³ãäœæããããã®ãReactã«ãããé«åºŠãªãšã©ãŒåŠçãã¯ããã¯ãæ¢æ±ããŸãããšã©ãŒå¢çããã¹ããã©ã¯ãã£ã¹ãã°ããŒãã«ãªã¬ãžãªãšã³ã¹æŠç¥ã«ã€ããŠåŠã³ãŸãã
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React 16ããåã¯ãReactã®ãšã©ãŒåŠçã¯ç ©éã§å¶éãããŠããŸãããã³ã³ããŒãã³ãå ã®ãšã©ãŒã¯éåžžãã¢ããªã±ãŒã·ã§ã³ã®ã«ãŒããŸã§ããã«ã¢ããããã¢ããªã±ãŒã·ã§ã³å šäœãã¢ã³ããŠã³ããããããšããããããŸãããããã«ããããŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ãäœäžããã¢ããªã±ãŒã·ã§ã³ã®ç¶æ ã倱ãããŸãããReact 16ã§ã¯ããšã©ãŒå¢çã®å°å ¥ã«ãããå€§å¹ ãªæ¹åãå ããããŸããã
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ãšã©ãŒå¢çã³ã³ããŒãã³ããäœæããã«ã¯ã`static getDerivedStateFromError()`ããã³/ãŸãã¯`componentDidCatch()`ã©ã€ããµã€ã¯ã«ã¡ãœãããå®è£ ããã¯ã©ã¹ã³ã³ããŒãã³ããäœæããå¿ èŠããããŸãããããã®ã¡ãœããã¯ãåå«ã³ã³ããŒãã³ãã«ãã£ãŠãšã©ãŒãã¹ããŒããããšãã«åŒã³åºãããŸãã
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import React from 'react';
class ErrorBoundary extends React.Component {
constructor(props) {
super(props);
this.state = { hasError: false };
}
static getDerivedStateFromError(error) {
// Update state so the next render will show the fallback UI.
return { hasError: true };
}
componentDidCatch(error, errorInfo) {
// You can also log the error to an error reporting service
console.error('Uncaught error:', error, errorInfo);
}
render() {
if (this.state.hasError) {
// You can render any custom fallback UI
return <h1>Something went wrong.</h1>;
}
return this.props.children;
}
}
export default ErrorBoundary;
ãã®äŸã§ã¯ïŒ
- `getDerivedStateFromError()`ã¯ãåå«ã³ã³ããŒãã³ãããšã©ãŒãã¹ããŒããåŸã«åŒã³åºãããŸãããšã©ãŒãçºçããããšã瀺ãããã«ã³ã³ããŒãã³ãã®ç¶æ ãæŽæ°ããŸãããã®ã¡ãœããã¯ããšã©ãŒã«åºã¥ããŠç¶æ ãæŽæ°ããããã«äœ¿çšãããŸãã
- `componentDidCatch()`ã¯ããšã©ãŒãã¹ããŒãããåŸã«åŒã³åºãããŸãããšã©ãŒãšããšã©ãŒãã¹ããŒããã³ã³ããŒãã³ãã«é¢ããæ å ±ãå«ããªããžã§ã¯ããåãåããŸãããã®ã¡ãœããã¯ããšã©ãŒã®ãã°èšé²ããšã©ãŒã¬ããŒãã®ãµãŒããŒãžã®éä¿¡ããŸãã¯ãšã©ãŒåŠçã«é¢é£ãããã®ä»ã®ã¢ã¯ã·ã§ã³ãå®è¡ããããã«äœ¿çšãããŸãã
- `render()`ã¡ãœããã¯ã`hasError`ç¶æ ã確èªãããšã©ãŒãçºçããå Žåã¯ãã©ãŒã«ããã¯UIãã¬ã³ããªã³ã°ããããã§ãªãå Žåã¯åã³ã³ããŒãã³ããã¬ã³ããªã³ã°ããŸãã
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ãšã©ãŒå¢çã䜿çšããã«ã¯ãä¿è·ããã³ã³ããŒãã³ãããšã©ãŒå¢çã³ã³ããŒãã³ãã§ã©ããããã ãã§ããããšãã°ïŒ
import React from 'react';
import ErrorBoundary from './ErrorBoundary';
import MyComponent from './MyComponent';
function App() {
return (
<div>
<ErrorBoundary>
<MyComponent />
</ErrorBoundary>
</div>
);
}
export default App;
ãã®äŸã§ã¯ã`MyComponent`ã¯`ErrorBoundary`å ã§ã©ãããããŠããŸãã`MyComponent`å ã§ãšã©ãŒãçºçããå Žåã`ErrorBoundary`ãããããã£ãããããã©ãŒã«ããã¯UIïŒäŸïŒãåé¡ãçºçããŸããããïŒãã¬ã³ããªã³ã°ããŸããããã«ãããã¢ããªã±ãŒã·ã§ã³å šäœãã¯ã©ãã·ã¥ããã®ãé²ããŸãããšã©ãŒãçºçããããã¢ããªã±ãŒã·ã§ã³ã®é åãã«ããŒããããã«ããšã©ãŒå¢çãæŠç¥çã«é 眮ããããšãå¿ããªãã§ãã ããã
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- ãŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ïŒUXïŒã®èæ ®äºé ïŒãšã©ãŒãåŠçãããšãã¯ãåžžã«ãŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ãèæ ®ããŠãã ãããå°éçšèªã§ãŠãŒã¶ãŒãå§åããããšã¯é¿ããŠãã ãããæç¢ºã§ç°¡æœãã€åœ¹ç«ã€ãšã©ãŒã¡ãã»ãŒãžãæäŸããŸããã¢ã¯ã·ã§ã³ã®å詊è¡ããµããŒããžã®é£çµ¡ãªã©ã®ãªãã·ã§ã³ãæäŸããŸãããšã©ãŒã¢ãŒãã«ãŸãã¯ããŒã«ãããã䜿çšããŠãéªéã«ãªããªãæ¹æ³ã§ãšã©ãŒæ å ±ã衚瀺ããããšãæ€èšããŠãã ããã
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function UserProfile({ user }) {
if (!user || typeof user.name !== 'string' || !user.email) {
return <div>Invalid user data.</div>;
}
return (
<div>
<h2>{user.name}</h2>
<p>{user.email}</p>
</div>
);
}
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async function fetchData() {
try {
const response = await fetch('https://api.example.com/data');
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
return data;
} catch (error) {
console.error('Fetch error:', error);
return null;
}
}
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Reactã®Context APIã䜿çšããŠãã°ããŒãã«ãšã©ãŒç¶æ ã管çããã¢ããªã±ãŒã·ã§ã³å šäœã§ãšã©ãŒåŠçã¡ã«ããºã ãæäŸã§ããŸããããã«ããããšã©ãŒåŠçããžãã¯ãäžå åãããã¹ãŠã®ã³ã³ããŒãã³ãããã¢ã¯ã»ã¹ã§ããããã«ããããšãã§ããŸããããšãã°ãã³ã³ããã¹ããããã€ããŒãã¢ããªã±ãŒã·ã§ã³å šäœãã©ããããã°ããŒãã«ãšã©ãŒã¢ãŒãã«ã衚瀺ããŠãšã©ãŒãåŠçã§ããŸãã
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import React, { createContext, useState, useContext } from 'react';
const ErrorContext = createContext();
function ErrorProvider({ children }) {
const [error, setError] = useState(null);
const handleError = (err) => {
setError(err);
console.error('Global Error:', err);
};
const clearError = () => {
setError(null);
};
const value = { error, handleError, clearError };
return (
<ErrorContext.Provider value={value}>
{children}
</ErrorContext.Provider>
);
}
function useError() {
return useContext(ErrorContext);
}
function App() {
return (
<ErrorProvider>
<MyComponent />
<ErrorDisplay />
</ErrorProvider>
);
}
function MyComponent() {
const { handleError } = useError();
const handleClick = () => {
try {
throw new Error('Simulated error from MyComponent');
} catch (err) {
handleError(err);
}
};
return <button onClick={handleClick}>Trigger Error</button>;
}
function ErrorDisplay() {
const { error, clearError } = useError();
return (
<div>
{error && (
<div>
<p>An error has occurred: {error.message}</p>
<button onClick={clearError}>Clear Error</button>
</div>
)}
</div>
);
}
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