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Nebel 2020-03-24 19:14:25 +09:00
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README.md
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# socket-io-example
Created with CodeSandbox

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package.json Normal file
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{
"name": "socket-io-example",
"version": "1.0.0",
"description": "",
"main": "src/index.js",
"scripts": {
"start": "nodemon src/index.js"
},
"dependencies": {
"express": "4.17.1",
"socket.io": "2.3.0"
},
"devDependencies": {
"nodemon": "1.18.4"
},
"keywords": []
}

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src/index.js Normal file
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// @ts-check
const path = require("path");
const app = require("express")();
const http = require("http").createServer(app);
const io = require("socket.io")(http);
const port = Number(process.env.PORT) || 8080;
app.get("/", function(_, res) {
res.sendFile(path.join(__dirname, "public", "index.html"));
});
http.listen(port, function() {
console.log(`listening on http://localhost:${port}`);
});
io.on("connect", socket => {
socket.on("message", message => io.send(message));
});

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src/public/index.html Normal file
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<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width" />
<title>Demo</title>
<script src="/socket.io/socket.io.js"></script>
<script type="module">
const socket = io();
socket.on("message", message => {
const messages = document.body.querySelector(".messages");
if (messages == null) return;
const p = document.createElement("p");
messages.append(p);
p.textContent = message;
});
document.body.querySelector("form").addEventListener("submit", event => {
event.preventDefault();
socket.send(new FormData(event.target).get("message"));
event.target.querySelectorAll("input").forEach(input => {
input.value = "";
});
});
</script>
</head>
<body>
<p class="messages"></p>
<form>
<input
type="text"
name="message"
autofocus
autocomplete="off"
size="40"
/>
</form>
<p class="description">
Developer Tools のコンソール (Ctrl+Shift+J や Cmd+Opt+J) を開いて次のコードを実行する:
<p>
メッセージを送るためのコードの例:
<pre>io().send("こんにちは")</pre>
</p>
<p>
メッセージを受け取るためのコードの例:
<pre>io().on("message", message => { document.body.textContent = message; })</pre>
</p>
</body>
</html>