websocket-crash-course/index.html at main · JavaScript-Mastery-Pro/websocket-crash-course · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>WebSocket Live Test Rig</title>
    <style>
      body {
        font-family: sans-serif;
        padding: 20px;
        background: #121212;
        color: #fff;
      }
      #log {
        background: #000;
        padding: 10px;
        height: 300px;
        overflow-y: scroll;
        border: 1px solid #333;
      }
      .status-on {
        color: #00ff00;
      }
      .status-off {
        color: #ff0000;
      }
    </style>
  </head>
  <body>
    <h1>WebSocket Broadcast Console</h1>
    <p id="status" class="status-off">Connecting...</p>

    <form id="message-form">
      <input
        id="message-input"
        type="text"
        placeholder="Send cargo..."
        required
      />
      <button type="submit">Deploy Message</button>
    </form>

    <h3>Live Stream Logs:</h3>
    <pre id="log"></pre>

    <script>
      const statusEl = document.getElementById("status");
      const log = document.getElementById("log");
      const input = document.getElementById("message-input");

      // 1. Initiate the Handshake
      const socket = new WebSocket("ws://localhost:8080");

      const appendLog = (label, message) => {
        const entry = `${new Date().toLocaleTimeString()} ${label} ${message}\n`;
        log.textContent = entry + log.textContent; // Prepend for fast reading
      };

      // 2. Event Listeners (The WebSocket Lifecycle)
      socket.addEventListener("open", () => {
        statusEl.textContent = "CONNECTED: ws://localhost:8080";
        statusEl.className = "status-on";
        appendLog("[SYSTEM]", "Tunnel Established. 🚀");
      });

      socket.addEventListener("message", (event) => {
        // This is where the broadcast from OTHER clients appears
        appendLog("[RECEIVED]", event.data);
      });

      socket.addEventListener("close", () => {
        statusEl.textContent = "DISCONNECTED";
        statusEl.className = "status-off";
        appendLog("[SYSTEM]", "Tunnel Collapsed. 👋");
      });

      // 3. Sending Data
      document
        .getElementById("message-form")
        .addEventListener("submit", (e) => {
          e.preventDefault();

          // SENIOR CHECK: Don't try to send if the socket is dead
          if (socket.readyState !== WebSocket.OPEN) {
            appendLog("[ERROR]", "No active tunnel found.");
            return;
          }

          const msg = input.value.trim();
          socket.send(msg); // Sending raw text through the tunnel
          appendLog("[SENT]", msg);
          input.value = "";
        });
    </script>
  </body>
</html>