node-js-express-socket-io-chat-room ソースコード全文

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app.js

app.js
// 参考ページ
// http://www.websuppli.com/nodejs/443/


const app = require('express')();
const server = require('http').Server(app);
const io = require('socket.io')(server);
const messages = [
    {
        id: 0,
        user: 'admin',
        text: 'チャットルームへようこそ'
    }
];
const rooms = [];
let room = null;


app.get('/', (req, res) => {
    // クライアントの画面表示用に chat.html を送信
    // res.sendFile(__dirname + '/chat.html');
    res.sendFile(__dirname + '/index.html');


    // setTimeout(() => {
    //     let rFound;
    //     let roomInit = {
    //         'roomName': room,
    //         'messages': [
    //             {
    //                 id: 0,
    //                 user: 'admin',
    //                 text: 'チャットルームへようこそ'
    //             }
    //         ]
    //     };
    //     retMessages = roomInit.messages;
    //     // 部屋がなければ、部屋をメモリ上に保存(部屋のメッセージを保存するため)
    //     if (rooms.length === 0) {
    //         rooms.push(roomInit);
    //     } else {
    //         rFound = rooms.find(r => {
    //             return r.roomName === room;
    //         });
    //         if(rFound){
    //             retMessages = rFound.messages;
    //         }
    //         else if (!rFound) {
    //             rooms.push(roomInit);
    //         }
    //     }
    //     // TODO: 初回表示時に部屋のチャット履歴を送信する。
    //     io.to(room).emit('init', retMessages);
    // }, 1000);
});


app.get('/*', (req, res) => {
    // クライアントの画面表示用に chat.html を送信
    res.sendFile(__dirname + '/chat.html');


    // setTimeout(() => {
    //     let rFound;
    //     let roomInit = {
    //         'roomName': room,
    //         'messages': [
    //             {
    //                 id: 0,
    //                 user: 'admin',
    //                 text: 'チャットルームへようこそ'
    //             }
    //         ]
    //     };
    //     retMessages = roomInit.messages;
    //     // 部屋がなければ、部屋をメモリ上に保存(部屋のメッセージを保存するため)
    //     if (rooms.length === 0) {
    //         rooms.push(roomInit);
    //     } else {
    //         rFound = rooms.find(r => {
    //             return r.roomName === room;
    //         });
    //         if (rFound) {
    //             retMessages = rFound.messages;
    //         }
    //         else if (!rFound) {
    //             rooms.push(roomInit);
    //         }
    //     }
    //     // TODO: 初回表示時に部屋のチャット履歴を送信する。
    //     io.to(room).emit('init', retMessages);
    // }, 1000);
});
// init でメッセージを受信したらクライアント全体にキャスト
io.on('connection', (socket) => {


    room = socket.request.headers.referer.split('/')[3];
    let r = room;
    socket.join(room, () => {
        //部屋ごとのメッセージ一覧を生成
        console.log('');
    });//url の末尾から部屋を決める。
    // 個別のメッセージ送信時
    socket.on('res', (msg) => {
        // const lastMessage = messages[messages.length - 1];
        // const user = msg.user;
        // const text = msg.text;
        // const obj = { id: lastMessage.id + 1, user: user, text: text };
        // messages.push(obj);




        // 送信されたメッセージを、対応する部屋の中に保存
        let room = rooms.find(r => {
            return r.roomName == msg.room
        });
        room.messages.push(msg);




        // 送信されたメッセージ(単体)を部屋にいるクライアントに送信
        io.to(msg.room).emit('res', msg);
    });
    socket.on('init', (msg) => {
        console.log(msg);
        let rFound;
        let roomInit = {
            'roomName': room,
            'messages': [
                {
                    id: 0,
                    user: 'admin',
                    text: 'チャットルームへようこそ'
                }
            ]
        };
        retMessages = roomInit.messages;
        // 部屋がなければ、部屋をメモリ上に保存(部屋のメッセージを保存するため)
        if (rooms.length === 0) {
            rooms.push(roomInit);
        } else {
            rFound = rooms.find(r => {
                return r.roomName === room;
            });
            if (rFound) {
                retMessages = rFound.messages;
            }
            else if (!rFound) {
                rooms.push(roomInit);
            }
        }
        // TODO: 初回表示時に部屋のチャット履歴を送信する。
        io.to(room).emit('init', retMessages);
    });
});


server.on('listening', () => {
    console.log('listening on 3000');
});


server.listen(3000);

chat.html

chat.html
<!DOCTYPE html>
<html>


<head>
    <meta charset="utf-8" />
    <title>Chatルーム</title>
</head>


<body>
    <h1>Chatルーム</h1>
    <form id='form'>
        <input id="user" placeholder="ユーザー名" />
        <input id="chat" placeholder="メッセージを入力" />
        <button>送信</button>
    </form>
    <ul id="messages"></ul>
    <script src="/socket.io/socket.io.js"></script>
    <script>
        var socket = io();
        var form = document.getElementById('form');
        var user = document.getElementById('user');
        var chat = document.getElementById('chat');
        var messages = document.getElementById('messages');


        form.addEventListener('submit', function (e) {
            // websocketを使うのでフォームの送信をキャンセル
            e.preventDefault();
            obj = {
                user: user.value,
                text: chat.value,
                room: window.location.pathname.replace('/', '')
            };
            // イベントを発火しデータを受け渡す
            socket.emit('res', obj);


            chat.value = '';
        });


        // サーバ側からchatイベントを待ち受ける
        socket.on('init', function (msg) {
            // 初回起動時に全てのメッセージを取得
            for (let i = 0; i < msg.length; i++) {
                var li = document.createElement('li');
                li.setAttribute('id', msg[i].id)
                li.textContent = msg[i].user + ' / ' + msg[i].text;
                messages.appendChild(li);
            }
            // 全てのメッセージを取得後、接続を切る(これまでのメッセージを取得し終わるため。)
            // https://teratail.com/questions/57569
            socket.off('init');
        });
        socket.on('res', function (msg) {
            var li = document.createElement('li');
            li.setAttribute('id', msg.id)
            li.textContent = msg.user + ' / ' + msg.text;
            messages.appendChild(li);
        });


        socket.emit('init', 'start');
    </script>
</body>


</html>

index.html

index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>部屋探し</title>
</head>
<body>
    <div>部屋探し...</div>
    <a href="http://localhost:3000/room1">room1</a>
    <a href="http://localhost:3000/room2">room2</a>
</body>
</html>

package-lock.json

package-lock.json
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  "name": "chat1",
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package.json

package.json
{
  "name": "chat1",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.16.3",
    "socket.io": "^2.1.1"
  }
}

README.md

README.md
# chat
## description
- Chat system built on Node.js, Express and Socket.io
- Multiple chat room supported. Access chat room with room path - e.g. http://localhost:3000/room1 or http://localhost:3000/room2
## installation and start
- npm i
- node app