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Reactãšç°¡åãªæšèŠAPIã䜿çšããŠãããã³ããšã³ãæšèŠã·ã¹ãã ãå®è£ ããå®è·µçãªäŸãèŠãŠãããŸãããã
1. Reactãããžã§ã¯ãã®ã»ããã¢ãã
ãŸããCreate React Appã䜿çšããŠæ°ããReactãããžã§ã¯ããäœæããŸãã
npx create-react-app frontend-recommendations
cd frontend-recommendations
2. æšèŠAPIã®äœæïŒç°¡ç¥åãããäŸïŒ
ç°¡åã«ããããã«ããŠãŒã¶ãŒIDã«åºã¥ããŠæšèŠè£œåã®ãªã¹ããè¿ãåçŽãªAPIãšã³ããã€ã³ãããããšä»®å®ããŸããããã¯Node.jsãPythonïŒFlask/DjangoïŒããŸãã¯ãã®ä»ã®ããã¯ãšã³ãæè¡ã§æ§ç¯ã§ããŸãã
APIãšã³ããã€ã³ãã®äŸ (/api/recommendations?userId=123):
[
{
"id": 1, "name": "Product A", "imageUrl": "/images/product_a.jpg"
},
{
"id": 2, "name": "Product B", "imageUrl": "/images/product_b.jpg"
},
{
"id": 3, "name": "Product C", "imageUrl": "/images/product_c.jpg"
}
]
3. Reactã§ã®æšèŠã®ååŸ
Reactã³ã³ããŒãã³ãïŒäŸïŒsrc/App.jsïŒã§ãuseEffectããã¯ã䜿çšããŠãã³ã³ããŒãã³ããããŠã³ãããããšãã«æšèŠãååŸããŸãã
import React, { useState, useEffect } from 'react';
function App() {
const [recommendations, setRecommendations] = useState([]);
const userId = 123; // å®éã®ãŠãŒã¶ãŒIDã«çœ®ãæããŠãã ãã
useEffect(() => {
const fetchRecommendations = async () => {
try {
const response = await fetch(`/api/recommendations?userId=${userId}`);
const data = await response.json();
setRecommendations(data);
} catch (error) {
console.error('Error fetching recommendations:', error);
}
};
fetchRecommendations();
}, [userId]);
return (
Recommended Products
{recommendations.map(product => (
-
{product.name}
))}
);
}
export default App;
4. æšèŠã®è¡šç€º
äžèšã®ã³ãŒãã¯ãrecommendationsé
åãå埩åŠçããå補åãç»åãšååã§è¡šç€ºããŸãããŠã§ããµã€ãã®ãã¶ã€ã³ã«åãããŠUIãã«ã¹ã¿ãã€ãºã§ããŸãã
5. æšèŠã®ãã£ãã·ã¥
ããã©ãŒãã³ã¹ãåäžãããããã«ããã©ãŠã¶ã®ããŒã«ã«ã¹ãã¬ãŒãžã«æšèŠããã£ãã·ã¥ã§ããŸããAPIããååŸããåã«ãæšèŠããã§ã«ãã£ãã·ã¥ãããŠãããã©ããã確èªããŸãããããããªãããã£ãã·ã¥ãããããŒã¿ã䜿çšããŸãããã£ãã·ã¥ã®ç¡å¹åïŒäŸïŒãŠãŒã¶ãŒããã°ã¢ãŠããããšããæšèŠã¢ãã«ãæŽæ°ããããšãïŒãåŠçããããšãå¿ããªãã§ãã ããã
// ... inside useEffect
useEffect(() => {
const fetchRecommendations = async () => {
const cachedRecommendations = localStorage.getItem('recommendations');
if (cachedRecommendations) {
setRecommendations(JSON.parse(cachedRecommendations));
return;
}
try {
const response = await fetch(`/api/recommendations?userId=${userId}`);
const data = await response.json();
setRecommendations(data);
localStorage.setItem('recommendations', JSON.stringify(data));
} catch (error) {
console.error('Error fetching recommendations:', error);
}
};
fetchRecommendations();
}, [userId]);
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