web-socket.html

<title>Web Socket</title>
<style>
#chat { width: 97%; }
.them { font-weight: bold; }
.them:before { content: 'them '; color: #bbb; font-size: 14px; }
.you { font-style: italic; }
.you:before { content: 'you '; color: #bbb; font-size: 14px; font-weight: bold; }
#log {
  overflow: auto;
  max-height: 300px;
  list-style: none;
  padding: 0;
/*  margin: 0;*/
}
#log li {
  border-top: 1px solid #ccc;
  margin: 0;
  padding: 10px 0;
}
</style>
<article>
  <form>
    <input type="text" id="chat" placeholder="type and press enter to chat" />
  </form>
  <p id="status">Not connected</p>
  <p>Users connected: <span id="connected">0</span></p>
  <p>To test, open two windows with Web Socket support, type a message above and press return.</p>
  <p>The server side code is available here: <a href="http://github.com/remy/html5demos/tree/master/server/">node-web-socket &amp; server</a> (note that it runs on <a href="http://nodejs.org/" title="node.js">nodejs</a>)</p>
  <ul id="log"></ul>
</article>
<script>
// let's invite Firefox to the party.
if (window.MozWebSocket) {
  window.WebSocket = window.MozWebSocket;
}

function openConnection() {
  // uses global 'conn' object
  if (conn.readyState === undefined || conn.readyState > 1) {
    conn = new WebSocket('ws://node.remysharp.com:8001');    
    conn.onopen = function () {
      state.className = 'success';
      state.innerHTML = 'Socket open';
    };

    conn.onmessage = function (event) {
      // console.log(event.data);
      var message = event.data; //JSON.parse(event.data);
      if (!(/^\d+$/).test(message)) {
        log.innerHTML = '<li class="them">' + message.replace(/[<>&]/g, function (m) { return entities[m]; }) + '</li>' + log.innerHTML;
      } else {
        connected.innerHTML = message;
      }
    };
    
    conn.onclose = function (event) {
      state.className = 'fail';
      state.innerHTML = 'Socket closed';
    };
  }
}

var connected = document.getElementById('connected'),
    log = document.getElementById('log'),
    chat = document.getElementById('chat'),
    form = chat.form,
    conn = {},
    state = document.getElementById('status'),
    entities = {
      '<' : '&lt;',
      '>' : '&gt;',
      '&' : '&amp;'
    };

if (window.WebSocket === undefined) {
  state.innerHTML = 'Sockets not supported';
  state.className = 'fail';
} else {
  state.onclick = function () {
    if (conn.readyState !== 1) {
      conn.close();
      setTimeout(function () {
        openConnection();
      }, 250);
    }
  };
  
  addEvent(form, 'submit', function (event) {
    event.preventDefault();

    // if we're connected
    if (conn.readyState === 1) {
      conn.send(JSON.stringify(chat.value));
      log.innerHTML = '<li class="you">' + chat.value.replace(/[<>&]/g, function (m) { return entities[m]; }) + '</li>' + log.innerHTML;
      
      chat.value = '';
    }
  });

  openConnection();  
}

</script>