websockets-without-socketio/index.html at main · Programonaut-Blog/websockets-without-socketio · GitHub

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<!DOCTYPE html>
<html lang="en">
<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>Client</title>
</head>
<body>
    <button onclick="create()">Create</button>
    <input type="text" name="room-code" id="room-code">
    <button onclick="join()">Join</button>
    <button onclick="leave()">Leave</button>
    <p><b id="last-msg"></b></p>
    <script>
        const ws = new WebSocket("ws://localhost:3000");

        ws.onopen = function (event) {}

        ws.onmessage = function (event) {
            console.log(event.data);
            document.getElementById("last-msg").innerText = event.data;
        }

        function create() { ws.send('{ "type": "create" }'); }

        function join() {
            const code = document.getElementById("room-code").value;
            const obj = { "type": "join" , "params": { "code": code }}
            ws.send(JSON.stringify(obj));
        }

        function leave() { ws.send('{ "type": "leave" }'); }
    </script>
</body>
</html>