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1. ãããžã§ã¯ãã®ã»ããã¢ãã
ãŸãããŸã ãªãå Žåã¯ãæ°ããNext.jsãããžã§ã¯ããäœæããŸãã
npx create-next-app my-optimistic-ui-app
ãããžã§ã¯ããã£ã¬ã¯ããªã«ç§»åããŸãã
cd my-optimistic-ui-app
2. ã³ã³ããŒãã³ãæ§é
ããã°èšäºãšããããããã¿ã³ã衚ã`BlogPost.js`ãšããã·ã³ãã«ãªã³ã³ããŒãã³ããäœæããŸãããã®ã³ã³ããŒãã³ãã¯ãUIã®æŽæ°ãåŠçãããµãŒããŒãšéä¿¡ããŸãããŸããç¶æ ã管çããæ¹æ³ãå¿ èŠã§ãããã®äŸã§ã¯ãReactã®`useState`ããã¯ã䜿çšããŸãã
3. ç¶æ 管ç
`BlogPost.js`å ã§ã`useState`ããã¯ã䜿çšããŠããããæ°ãšããŒãã£ã³ã°ã€ã³ãžã±ãŒã¿ãŒã®ç¶æ ã管çããŸããããã«ããããªããã£ãã¹ãã£ãã¯ç¶æ ã管çãããµãŒããŒãªã¯ãšã¹ããé²è¡äžã§ãããããšã©ãŒãçºçããå Žåã«ãŠãŒã¶ãŒã«è¡šç€ºã§ããŸãã
4. ããããã¿ã³ã®ããžãã¯
ããããã¿ã³ãã¯ãªãã¯ãããå Žåãæ¬¡ã®æé ãå®è¡ãããŸãã
- UIããªããã£ãã¹ãã£ãã¯ã«æŽæ°ããïŒã³ã³ããŒãã³ãã®ç¶æ ã®ãããæ°ãããã«å¢ããããŠãŒã¶ãŒã«å³æã®ãã£ãŒãããã¯ãæäŸããŸãã
- ãµãŒããŒãªã¯ãšã¹ããéå§ããïŒãµãŒããŒã«ãªã¯ãšã¹ããéä¿¡ããŠãããŒã¿ããŒã¹ã«ããããä¿åããŸãïŒäŸïŒ`fetch` APIã䜿çšïŒã
- ãµãŒããŒã®å¿çãåŠçããïŒ
- æåïŒãµãŒããŒããããã確èªããå ŽåãUIã¯å€æŽãããŸããã
- 倱æïŒãµãŒããŒããšã©ãŒãå ±åããå Žåããããæ°ãåã®å€ã«æ»ãããŠãŒã¶ãŒã«ãšã©ãŒã¡ãã»ãŒãžã衚瀺ããŸããããã¯ã`try...catch`ãããã¯ã䜿çšããŠå®è¡ã§ããŸãã
5. ã³ãŒãäŸïŒBlogPost.jsïŒ
ãªããã£ãã¹ãã£ãã¯UIã®å®è£ ãå«ãã`BlogPost.js`ã³ã³ããŒãã³ãã®å®å šãªäŸã次ã«ç€ºããŸãã
import { useState } from 'react';
const BlogPost = ({ postId, initialLikes }) => {
const [likes, setLikes] = useState(initialLikes);
const [isLiking, setIsLiking] = useState(false);
const [error, setError] = useState(null);
const handleLike = async () => {
setIsLiking(true);
setError(null);
const optimisticLikes = likes + 1;
setLikes(optimisticLikes);
try {
// Simulate a network request (replace with your actual API call)
await new Promise(resolve => setTimeout(resolve, 1000)); // Simulate network delay
// Replace with your API call to update the like count on the server
const response = await fetch(`/api/like?postId=${postId}`, {
method: 'POST',
});
if (!response.ok) {
throw new Error("Failed to like the post");
}
} catch (err) {
console.error('Error liking post:', err);
setError('Failed to like. Please try again.');
// Revert the UI
setLikes(likes - 1); // Revert to previous state if the server request fails.
}
finally {
setIsLiking(false);
}
};
return (
Post ID: {postId}
Likes: {likes}
{error && {error}
}
);
};
export default BlogPost;
ãã®äŸã§ã¯ããŠãŒã¶ãŒãããããããã¿ã³ãã¯ãªãã¯ãããšã`handleLike`颿°ãããªã¬ãŒãããŸããããã«`likes`ã®ç¶æ ãå¢ãããå³åº§ã«èŠèŠçãªãã£ãŒãããã¯ãæäŸããŸããæ¬¡ã«ã`setTimeout`ã䜿çšããŠãããã¯ãŒã¯ãªã¯ãšã¹ããã·ãã¥ã¬ãŒãããŸããã·ãã¥ã¬ãŒãããããããã¯ãŒã¯é å»¶ã®åŸãå®éã®APIåŒã³åºããè¡ããããããæ°ãæŽæ°ãããŸããAPIåŒã³åºãã倱æããå ŽåïŒäŸïŒãããã¯ãŒã¯ãšã©ãŒã®ããïŒãUIã¯å ã®ç¶æ ã«æ»ãããšã©ãŒã¡ãã»ãŒãžã衚瀺ãããŸãã`isLiking`ã®ç¶æ ã¯ããµãŒããŒãªã¯ãšã¹ãäžã«ãã¿ã³ãç¡å¹ã«ããããã«äœ¿çšãããŸãã
6. APIã«ãŒãïŒpages/api/like.jsïŒ
äŸãé©åã«æ©èœãããã«ã¯ããµãŒããŒã§ã®ãããã®åŠçãã·ãã¥ã¬ãŒãããNext.js APIã«ãŒãïŒ`pages/api`ãã£ã¬ã¯ããªå ïŒãå¿ èŠã§ããå®éã®ã¢ããªã±ãŒã·ã§ã³ã§ã¯ããã®ã«ãŒããããŒã¿ããŒã¹ãšå¯Ÿè©±ããŸãã
// pages/api/like.js
export default async function handler(req, res) {
if (req.method === 'POST') {
const postId = req.query.postId;
// In a real app, update the like count in your database here.
// For this example, we just simulate a successful response.
await new Promise(resolve => setTimeout(resolve, 1000)); // Simulate server processing time
res.status(200).json({ message: 'Like successful!' });
} else {
res.status(405).json({ message: 'Method Not Allowed' });
}
}
ãã®ã·ã³ãã«ãªAPIã«ãŒãã¯ããããããæ°ãæŽæ°ããããã®POSTãªã¯ãšã¹ããã·ãã¥ã¬ãŒãããŸããããŒã¿ã®æŽæ°ã«ãããæéã衚ãã·ãã¥ã¬ãŒããããé å»¶ãå«ãŸããŠããŸããã³ã¡ã³ãã// In a real app, update the like count in your database here.ããå®éã®ããŒã¿ããŒã¹æŽæ°ããžãã¯ã«çœ®ãæããŠãã ããã
7. ã³ã³ããŒãã³ãã®äœ¿çš
`BlogPost`ã³ã³ããŒãã³ããNext.jsã¢ããªã±ãŒã·ã§ã³ã§äœ¿çšããã«ã¯ãããŒãžã³ã³ããŒãã³ãïŒäŸïŒ`pages/index.js`ïŒã«ã€ã³ããŒããã`postId`ããã³`initialLikes`ãããããæž¡ããŸãã
import BlogPost from '../components/BlogPost';
const Home = () => {
return (
My Blog
);
};
export default Home;
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