React Suspenseã䜿ã£ãŠãReactã¢ããªã±ãŒã·ã§ã³ã«ãããèªã¿èŸŒã¿ç¶æ ã广çã«ç®¡çã»é£æºãããæ¹æ³ãåŠã³ãŸããè€æ°ã³ã³ããŒãã³ãã®ããŒã¿ååŸããšã©ãŒåŠçãæ¹åãããŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ãåäžãããŸãã
React Suspenseã®é£æºïŒè€æ°ã³ã³ããŒãã³ãã®èªã¿èŸŒã¿ç¶æ ããã¹ã¿ãŒãã
React Suspenseã¯ãReact 16.6ã§å°å ¥ããã匷åãªæ©èœã§ãPromiseã解決ããããŸã§ã³ã³ããŒãã³ãã®ã¬ã³ããªã³ã°ããäžæåæ¢ãããããšãã§ããŸããããã¯ãããŒã¿ååŸãã³ãŒãåå²ãç»åèªã¿èŸŒã¿ãªã©ã®éåææäœãåŠçããã®ã«ç¹ã«åœ¹ç«ã¡ãèªã¿èŸŒã¿ç¶æ ã宣èšçã«ç®¡çãããŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ãåäžãããæ¹æ³ãæäŸããŸãã
ããããç°ãªãéåæããŒã¿ãœãŒã¹ã«äŸåããè€æ°ã®ã³ã³ããŒãã³ããæ±ãå Žåãèªã¿èŸŒã¿ç¶æ ã®ç®¡çã¯ããè€éã«ãªããŸãããã®èšäºã§ã¯ãè€æ°ã®ã³ã³ããŒãã³ãéã§Suspenseã飿ºãããããã®ãã¯ããã¯ãæ·±ãæãäžãããŠãŒã¶ãŒã«ã¹ã ãŒãºã§äžè²«ããèªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ãæäŸããæ¹æ³ã解説ããŸãã
React Suspenseãçè§£ãã
飿ºãã¯ããã¯ã«å
¥ãåã«ãReact Suspenseã®åºæ¬ãå確èªããŸãããããã®æ žãšãªãæŠå¿µã¯ããäžæåæ¢ãããå¯èœæ§ã®ããã³ã³ããŒãã³ãã<Suspense>å¢çã§ã©ããããããšã§ãããã®å¢çã¯ãäžæåæ¢äžã®ã³ã³ããŒãã³ããããŒã¿ãåŸ
ã£ãŠããéã«è¡šç€ºããããã©ãŒã«ããã¯UIïŒéåžžã¯èªã¿èŸŒã¿ã€ã³ãžã±ãŒã¿ïŒãæå®ããŸãã
åºæ¬çãªäŸã以äžã«ç€ºããŸãã
import React, { Suspense } from 'react';
// Simulated asynchronous data fetching
const fetchData = () => {
return new Promise(resolve => {
setTimeout(() => {
resolve({ data: 'Fetched data!' });
}, 2000);
});
};
const Resource = {
read() {
if (!this.promise) {
this.promise = fetchData().then(data => {
this.data = data;
return data; // Ensure the promise resolves with the data
});
}
if (this.data) {
return this.data;
} else if (this.promise) {
throw this.promise; // Suspend!
} else {
throw new Error('Unexpected state'); // Should not happen
}
}
};
const MyComponent = () => {
const data = Resource.read();
return <p>{data.data}</p>;
};
const App = () => {
return (
<Suspense fallback=<p>Loading...</p>>
<MyComponent />
</Suspense>
);
};
export default App;
ãã®äŸã§ã¯ãMyComponentãããŒã¿ååŸãã·ãã¥ã¬ãŒãããResource.read()ãåŒã³åºããŠããŸããããŒã¿ããŸã å©çšå¯èœã§ãªãå ŽåïŒã€ãŸããPromiseã解決ãããŠããªãå ŽåïŒãPromiseãã¹ããŒããReactã¯MyComponentã®ã¬ã³ããªã³ã°ãäžæåæ¢ããã<Suspense>ã³ã³ããŒãã³ãã§å®çŸ©ããããã©ãŒã«ããã¯UIã衚瀺ããŸãã
è€æ°ã³ã³ããŒãã³ãã®èªã¿èŸŒã¿ã®èª²é¡
çã®è€éãã¯ããããããç¬èªã®ããŒã¿ãååŸããäžç·ã«è¡šç€ºããå¿
èŠãããè€æ°ã®ã³ã³ããŒãã³ããããå Žåã«çããŸããåã³ã³ããŒãã³ããç¬èªã®<Suspense>å¢çã§åçŽã«ã©ãããããšãè€æ°ã®èªã¿èŸŒã¿ã€ã³ãžã±ãŒã¿ãåå¥ã«è¡šç€ºããããæ¶ãããããŠããŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ãããã¡ãªããªãå¯èœæ§ããããŸãã
ãŠãŒã¶ãŒãããã¡ã€ã«ãæè¿ã®ã¢ã¯ãã£ããã£ãã·ã¹ãã çµ±èšã衚瀺ããã³ã³ããŒãã³ããå«ãããã·ã¥ããŒãã¢ããªã±ãŒã·ã§ã³ãèããŠã¿ãŠãã ããããããã®åã³ã³ããŒãã³ãã¯ãç°ãªãAPIããããŒã¿ãååŸããå¯èœæ§ããããŸããããŒã¿ãå°çãããã³ã«åã³ã³ããŒãã³ãã«åå¥ã®èªã¿èŸŒã¿ã€ã³ãžã±ãŒã¿ã衚瀺ãããšãã°ãã°ãã§ãããã§ãã·ã§ãã«ã§ãªãå°è±¡ãäžããå¯èœæ§ããããŸãã
Suspenseã飿ºãããããã®æŠç¥
ããçµ±äžãããèªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ãäœæããããã«ãSuspenseã飿ºãããããã®ããã€ãã®æŠç¥ã以äžã«ç€ºããŸãã
1. äžå åãããSuspenseå¢ç
æãåçŽãªã¢ãããŒãã¯ãã³ã³ããŒãã³ããå«ãã»ã¯ã·ã§ã³å
šäœãåäžã®<Suspense>å¢çã§ã©ããããããšã§ããããã«ããããã®å¢çå
ã®ãã¹ãŠã®ã³ã³ããŒãã³ããå®å
šã«èªã¿èŸŒãŸãããããããã¯ãã¹ãŠã®ã³ã³ããŒãã³ãã«å¯ŸããŠãã©ãŒã«ããã¯UIãåæã«è¡šç€ºããããã®ã©ã¡ããã«ãªããŸãã
import React, { Suspense } from 'react';
// Assume MyComponentA and MyComponentB both use resources that suspend
import MyComponentA from './MyComponentA';
import MyComponentB from './MyComponentB';
const Dashboard = () => {
return (
<Suspense fallback=<p>Loading Dashboard...</p>>
<div>
<MyComponentA />
<MyComponentB />
</div>
</Suspense>
);
};
export default Dashboard;
å©ç¹ïŒ
- å®è£ ãç°¡åã§ãã
- çµ±äžãããèªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ãæäŸããŸãã
æ¬ ç¹ïŒ
- äœã衚瀺ãããåã«ãã¹ãŠã®ã³ã³ããŒãã³ããèªã¿èŸŒãŸããå¿ èŠããããåæèªã¿èŸŒã¿æéãå¢å ããå¯èœæ§ããããŸãã
- 1ã€ã®ã³ã³ããŒãã³ãã®èªã¿èŸŒã¿ã«éåžžã«æéããããå Žåãã»ã¯ã·ã§ã³å šäœãèªã¿èŸŒã¿ç¶æ ã®ãŸãŸã«ãªããŸãã
2. åªå é äœä»ãã«ãããã现ããªSuspense
ãã®ã¢ãããŒãã§ã¯ãè€æ°ã®<Suspense>å¢çã䜿çšããŸãããåæãŠãŒã¶ãŒãšã¯ã¹ããªãšã³ã¹ã«äžå¯æ¬ ãªã³ã³ããŒãã³ãã«åªå
é äœãä»ããŸããéèŠã§ãªãã³ã³ããŒãã³ããç¬èªã®<Suspense>å¢çã§ã©ããããããšã§ãããéèŠãªã³ã³ããŒãã³ããå
ã«èªã¿èŸŒãŸããŠè¡šç€ºãããããã«ã§ããŸãã
äŸãã°ãååããŒãžã§ã¯ãåååãšäŸ¡æ Œã®è¡šç€ºãåªå ãã顧客ã¬ãã¥ãŒã®ãããªéèŠæ§ã®äœã詳现ã¯åŸã§èªã¿èŸŒãããšãã§ããŸãã
import React, { Suspense } from 'react';
// Assume ProductDetails and CustomerReviews both use resources that suspend
import ProductDetails from './ProductDetails';
import CustomerReviews from './CustomerReviews';
const ProductPage = () => {
return (
<div>
<Suspense fallback=<p>Loading Product Details...</p>>
<ProductDetails />
</Suspense>
<Suspense fallback=<p>Loading Customer Reviews...</p>>
<CustomerReviews />
</Suspense>
</div>
);
};
export default ProductPage;
å©ç¹ïŒ
- ããããã°ã¬ãã·ããªèªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ãå¯èœã«ããŸãã
- éèŠãªã³ã³ãã³ããçŽ æ©ã衚瀺ããããšã§ãç¥èŠãããããã©ãŒãã³ã¹ãåäžãããŸãã
æ¬ ç¹ïŒ
- ã©ã®ã³ã³ããŒãã³ããæãéèŠããæ éã«æ€èšããå¿ èŠããããŸãã
- å調æ§ã®ãªãã¢ãããŒããããäžå¿«æã¯å°ãªããã®ã®ãè€æ°ã®èªã¿èŸŒã¿ã€ã³ãžã±ãŒã¿ã衚瀺ãããå¯èœæ§ããããŸãã
3. å ±æèªã¿èŸŒã¿ç¶æ ã®äœ¿çš
Suspenseã®ãã©ãŒã«ããã¯ã®ã¿ã«äŸåããã®ã§ã¯ãªããããé«ãã¬ãã«ïŒäŸïŒReact ContextãReduxãZustandã®ãããªç¶æ 管çã©ã€ãã©ãªã䜿çšïŒã§å ±æã®èªã¿èŸŒã¿ç¶æ ã管çãããã®ç¶æ ã«åºã¥ããŠã³ã³ããŒãã³ããæ¡ä»¶ä»ãã§ã¬ã³ããªã³ã°ããããšãã§ããŸãã
ãã®ã¢ãããŒãã¯ãèªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ã«å¯Ÿãããããã现ããªå¶åŸ¡ãå¯èœã«ããå šäœçãªé²è¡ç¶æ³ãåæ ããã«ã¹ã¿ã ã®èªã¿èŸŒã¿UIã衚瀺ããããšãå¯èœã«ããŸãã
import React, { createContext, useContext, useState, useEffect } from 'react';
const LoadingContext = createContext();
const useLoading = () => useContext(LoadingContext);
const LoadingProvider = ({ children }) => {
const [isLoadingA, setIsLoadingA] = useState(true);
const [isLoadingB, setIsLoadingB] = useState(true);
useEffect(() => {
// Simulate data fetching for Component A
setTimeout(() => {
setIsLoadingA(false);
}, 1500);
// Simulate data fetching for Component B
setTimeout(() => {
setIsLoadingB(false);
}, 2500);
}, []);
const isLoading = isLoadingA || isLoadingB;
return (
<LoadingContext.Provider value={{ isLoadingA, isLoadingB, isLoading }}>
{children}
</LoadingContext.Provider>
);
};
const MyComponentA = () => {
const { isLoadingA } = useLoading();
if (isLoadingA) {
return <p>Loading Component A...</p>;
}
return <p>Data from Component A</p>;
};
const MyComponentB = () => {
const { isLoadingB } = useLoading();
if (isLoadingB) {
return <p>Loading Component B...</p>;
}
return <p>Data from Component B</p>;
};
const App = () => {
const { isLoading } = useLoading();
return (
<LoadingProvider>
<div>
{isLoading ? (<p>Loading Application...</p>) : (
<>
<MyComponentA />
<MyComponentB />
<>
)}
</div>
</LoadingProvider>
);
};
export default App;
å©ç¹ïŒ
- èªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ã«å¯Ÿãããã现ããªå¶åŸ¡ãæäŸããŸãã
- ã«ã¹ã¿ã ã®èªã¿èŸŒã¿ã€ã³ãžã±ãŒã¿ãé²ææŽæ°ãå¯èœã«ããŸãã
æ¬ ç¹ïŒ
- ããå€ãã®ã³ãŒããšè€éããå¿ èŠãšããŸãã
- ã¡ã³ããã³ã¹ãããå°é£ã«ãªãå¯èœæ§ããããŸãã
4. SuspenseãšError Boundariesã®çµã¿åãã
ããŒã¿ååŸäžã®æœåšçãªãšã©ãŒãåŠçããããšã¯éåžžã«éèŠã§ããReact Error Boundariesã䜿çšãããšãã¬ã³ããªã³ã°äžã«çºçãããšã©ãŒãé©åã«ãã£ãããããã©ãŒã«ããã¯UIã衚瀺ã§ããŸããSuspenseãšError Boundariesãçµã¿åãããããšã§ãåé¡ãçºçããå Žåã§ãå ç¢ã§ãŠãŒã¶ãŒãã¬ã³ããªãŒãªãšã¯ã¹ããªãšã³ã¹ãä¿èšŒããŸãã
import React, { Suspense } 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(error, errorInfo);
}
render() {
if (this.state.hasError) {
// You can render any custom fallback UI
return <h1>Something went wrong.</h1>;
}
return this.props.children;
}
}
// Assume MyComponent can throw an error during rendering (e.g., due to failed data fetching)
import MyComponent from './MyComponent';
const App = () => {
return (
<ErrorBoundary>
<Suspense fallback=<p>Loading...</p>>
<MyComponent />
</Suspense>
</ErrorBoundary>
);
};
export default App;
ãã®äŸã§ã¯ãErrorBoundaryã³ã³ããŒãã³ããSuspenseå¢çãã©ããããŠããŸããMyComponentå
ã§ãšã©ãŒãçºçããå ŽåïŒåæã¬ã³ããªã³ã°æããŸãã¯ããŒã¿ååŸã«ãã£ãŠããªã¬ãŒããããã®åŸã®æŽæ°æïŒãErrorBoundaryããšã©ãŒããã£ãããããã©ãŒã«ããã¯UIã衚瀺ããŸãã
ãã¹ããã©ã¯ãã£ã¹ïŒã¢ããªã±ãŒã·ã§ã³ã®åã»ã¯ã·ã§ã³ã«åãããŠèª¿æŽããããšã©ãŒåŠçãšã¯ã¹ããªãšã³ã¹ãæäŸããããã«ãã³ã³ããŒãã³ãããªãŒã®ç°ãªãã¬ãã«ã«ãšã©ãŒå¢çãæŠç¥çã«é 眮ããŠãã ããã
5. ã³ãŒãåå²ã®ããã®React.lazyã®äœ¿çš
React.lazyã䜿çšãããšãã³ã³ããŒãã³ããåçã«ã€ã³ããŒãããã³ãŒãããªã³ããã³ãã§èªã¿èŸŒãŸããå°ããªãã£ã³ã¯ã«åå²ã§ããŸããããã«ãããç¹ã«å€§èŠæš¡ã§è€éãªã¢ããªã±ãŒã·ã§ã³ã«ãããŠãã¢ããªã±ãŒã·ã§ã³ã®åæèªã¿èŸŒã¿æéã倧å¹
ã«æ¹åã§ããŸãã
<Suspense>ãšçµã¿åãããŠäœ¿çšââãããšãReact.lazyã¯ãããã®ã³ãŒããã£ã³ã¯ã®èªã¿èŸŒã¿ãã·ãŒã ã¬ã¹ã«åŠçããæ¹æ³ãæäŸããŸãã
import React, { Suspense, lazy } from 'react';
const MyComponent = lazy(() => import('./MyComponent')); // Dynamically import MyComponent
const App = () => {
return (
<Suspense fallback=<p>Loading component...</p>>
<MyComponent />
</Suspense>
);
};
export default App;
ãã®äŸã§ã¯ãMyComponentã¯React.lazyã䜿çšããŠåçã«ã€ã³ããŒããããŠããŸããMyComponentãåããŠã¬ã³ããªã³ã°ããããšãReactã¯å¯Ÿå¿ããã³ãŒããã£ã³ã¯ãèªã¿èŸŒã¿ãŸããã³ãŒãã®èªã¿èŸŒã¿äžã¯ã<Suspense>ã³ã³ããŒãã³ãã§æå®ããããã©ãŒã«ããã¯UIã衚瀺ãããŸãã
ç°ãªãã¢ããªã±ãŒã·ã§ã³ã«ãããå®è·µäŸ
ãããã®æŠç¥ãæ§ã ãªå®éã®ã·ããªãªã§ã©ã®ããã«é©çšã§ããããèŠãŠãããŸãããã
Eã³ããŒã¹ãŠã§ããµã€ã
åå詳现ããŒãžã§ã¯ãåªå
é äœä»ãããããã现ããªSuspenseã䜿çšã§ããŸããååç»åãã¿ã€ãã«ãäŸ¡æ Œããã©ã€ããªã®<Suspense>å¢çå
ã«è¡šç€ºãã顧客ã¬ãã¥ãŒãé¢é£ååãé
éæ
å ±ãå¥ã
ã®åªå
床ã®äœã<Suspense>å¢çã§èªã¿èŸŒã¿ãŸããããã«ããããŠãŒã¶ãŒã¯éèŠãªååæ
å ±ãçŽ æ©ã確èªã§ããéèŠåºŠã®äœã詳现ã¯ããã¯ã°ã©ãŠã³ãã§èªã¿èŸŒãŸããããšã«ãªããŸãã
ãœãŒã·ã£ã«ã¡ãã£ã¢ãã£ãŒã
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åãããSuspenseãšãã现ããªSuspenseãçµã¿åãããããšãã§ããŸãããã£ãŒãå
šäœã<Suspense>å¢çã§ã©ããããŠãæåã®æçš¿ã»ãããååŸãããéãäžè¬çãªèªã¿èŸŒã¿ã€ã³ãžã±ãŒã¿ã衚瀺ããŸãããã®åŸãåæçš¿ã«å¯ŸããŠåå¥ã®<Suspense>å¢çã䜿çšããç»åããããªãã³ã¡ã³ãã®èªã¿èŸŒã¿ãåŠçããŸããããã«ãããåã
ã®æçš¿ããã£ãŒãå
šäœããããã¯ããããšãªãç¬ç«ããŠèªã¿èŸŒãŸãããããããã¹ã ãŒãºãªèªã¿èŸŒã¿ãšã¯ã¹ããªãšã³ã¹ãå®çŸããŸãã
ããŒã¿å¯èŠåããã·ã¥ããŒã
ããŒã¿å¯èŠåããã·ã¥ããŒãã§ã¯ãå ±æèªã¿èŸŒã¿ç¶æ ã®äœ¿çšãæ€èšããŠãã ãããããã«ãããé²æç¶æ³ã®æŽæ°ãå«ãã«ã¹ã¿ã ã®èªã¿èŸŒã¿UIã衚瀺ã§ãããŠãŒã¶ãŒã«å šäœçãªèªã¿èŸŒã¿é²è¡ç¶æ³ãæç¢ºã«ç€ºããŸãããŸããããŒã¿ååŸäžã«çºçããå¯èœæ§ã®ãããšã©ãŒãåŠçããããã«Error Boundariesã䜿çšããããã·ã¥ããŒãå šäœãã¯ã©ãã·ã¥ãã代ããã«ãæ å ±ãæäŸãããšã©ãŒã¡ãã»ãŒãžã衚瀺ããããšãã§ããŸãã
ãã¹ããã©ã¯ãã£ã¹ãšèæ ®äºé
- ããŒã¿ååŸã®æé©åïŒSuspenseã¯ãããŒã¿ååŸãå¹ççã§ããå Žåã«æãããæ©èœããŸãããããã¯ãŒã¯ãªã¯ãšã¹ãã®æ°ãæå°éã«æããããã©ãŒãã³ã¹ãåäžãããããã«ãã¡ã¢åããã£ãã·ã¥ããªã¯ãšã¹ããããåŠçãªã©ã®ãã¯ããã¯ã䜿çšããŠãã ããã
- é©åãªãã©ãŒã«ããã¯UIã®éžæïŒãã©ãŒã«ããã¯UIã¯èŠèŠçã«é åçã§æ å ±ãæäŸãããã®ã§ããã¹ãã§ããæ±çšçãªèªã¿èŸŒã¿ã¹ãããŒã®äœ¿çšã¯é¿ãã代ããã«äœãèªã¿èŸŒãŸããŠãããã«ã€ããŠã®ã³ã³ããã¹ãåºæã®æ å ±ãæäŸããŠãã ããã
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