FireSocket/example/index.html at master · darthwalsh/FireSocket · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>title</title>
    <script src="firesocket.js"></script>
  </head>
  <body>
    <textarea id="chat" readonly style="width: 100%;"></textarea>
    <br />
    <div style="display: flex;">
      <input id="input" type="input" style="width: 100%;" />
      <input id="submit" type="submit" />
    </div>
    <script defer>
      const Socket = FireSocket || WebSocket;

      const chat = document.getElementById("chat");
      const input = document.getElementById("input");

      const ws = new Socket(window.location.href.replace("http", "ws"));
      ws.addEventListener("open", () => {
        document.getElementById("submit").onclick = submit;
        input.onkeydown = e => {
          if (e.key === "Enter") submit();
        };
      });
      ws.addEventListener("message", ev => {
        chat.textContent += ev.data + "\n";
        chat.style.height = "auto";
        chat.style.height = chat.scrollHeight + "px";
      });

      function submit() {
        ws.send(input.value);
        input.value = "";
      }
    </script>
  </body>
</html>