websock.html

<!DOCTYPE html>
<meta charset="utf-8"/>
<title>WebSocket Test</title>


  // Client for Python SimpleWebsocketServer
  const portnum = 8001;
  var host, server, connected = false;

  // Display the given text
  function display(s)
  {
    document.myform.text.value += s;
    document.myform.text.scrollTop = document.myform.text.scrollHeight;
  }

  // Initialisation
  function init()
  {
    host = location.host ? String(location.host) : "unknown";
    host = host.replace("127.0.0.1", "localhost");
    server = host.replace(/:\d*\b/, ":" + portnum);
    document.myform.text.value = "Host " + host + "\n";
    window.setInterval(timer_tick, 1000);
  }

  // Open a Websocket connection
  function connect()
  {
    var url = "ws://" + server + "/";
    display("Opening websocket " + url + "\n");
    websock = new WebSocket(url);
    websock.onopen    = function(evt) {sock_open(evt)};
    websock.onclose   = function(evt) {sock_close(evt)};
    websock.onmessage = function(evt) {sock_message(evt)};
    websock.onerror   = function(evt) {sock_error(evt)};
    connected = true;
  }
  // Close a Websocket connection
  function disconnect()
  {
    connected = false;
    websock.close();
  }

  // Timer tick handler
  function timer_tick()
  {
    if (connected)
      websock.send('*');
  }

  // Display incoming data
  function sock_message(evt)
  {
    display(evt.data);
  }

  // Handlers for other Websocket events
  function sock_open(evt)
  {
    display("Connected\n");
  }
  function sock_close(evt)
  {
    display("\nDisconnected\n");
  }
  function sock_error(evt)
  {
    display("Socket error\n");
    websock.close();
  }

  // Do initialisation when page is loaded
  window.addEventListener("load", init, false);


<form name="myform">
  <h2>Websocket test</h2>
  <p>
  <textarea name="text" rows="10" cols="60">
  </textarea>
  </p>
  <p>
  <input type="button" value="Connect" onClick="connect();">
  <input type="button" value="Disconnect" onClick="disconnect();">
  </p>
</form>
</html> 

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