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【Node.js、Express】バックエンドサーバー６（2章までのコード）
作成日：
2022/05/01
1
index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>coronaDate</title>
</head>
<body>
<h1>日本の季節</h1>
<p>秋は行楽シーズンで、たくさんの人が観光にでかける。</p>
<h3>POST（投稿）</h3>
<form action="/autumn" method="POST">
<input type="text" name="activity">
<button type="submit">投稿</button>
</form>
<br><br>
<hr>
<br>
<h3>PUT（更新）</h3>
<form action="/update" method="POST">
<input type="text" name="updateActivity">
<button type="submit">変更</button>
</form>
<br><br>
<hr>
<br>
<h3>DELETE（削除）</h3>
<form action="/delete" method="POST">
<input type="radio" name="number" value="0" id="one">
<label for="one">1</label>
<br>
<input type="radio" name="number" value="1" id="two">
<label for="two">2</label>
<br>
<input type="radio" name="number" value="2" id="three">
<label for="three">3</label>
<br>
<button type="submit">削除</button>
</form>
<br><br>
<hr>
<br>
<h3>LINK</h3>
<p><a href="./autumn">autumn</a></p>
<p><a href="./update">update</a></p>
</body>
</html>
index.js
const fs = require('fs');
const express = require("express");
const activities = require("./activities.json");
const app = express();
// const coronaData = require("./coronaData.json");
app.use(express.urlencoded({ extended: true }));
/* ----- index読み込み ----- */
app.get("/", function (req, res) {
res.sendFile(__dirname + "/index.html");
});
/* ----- autumnファイル書き込み（投稿） ----- */
app.post("/autumn", function (req, res) {
fs.writeFile(__dirname + "/data.txt", req.body.activity, function() {
res.send("投稿完了");
});
});
/* ----- データの変更 ----- */
app.post("/update", function (req, res) {
activities[0].activity = req.body.updateActivity;
res.send(activities);
});
/* ----- データの削除 ----- */
app.post("/delete", function (req, res) {
activities.splice(req.body.number, 1);
res.send(activities);
})
/* ----- バックエンドサーバーとブラウザをつなぐ ----- */
app.listen(5000, function() {
console.log("Listeningonlocalhostport5000");
})
activities
[
{
"activities": "いちご狩り"
},
{
"activities": "バイキング"
},
{
"activities": "芸術鑑賞"
}
]
package.json
{
"name": "express",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.17.3"
}
}
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