Building an HTML and JavaScript chat client

In order for the users of our chat application to interact with the server and therefore other users, we need to write some client-side code that makes use of the web sockets found in modern browsers. We are already delivering HTML content via the template when users hit the root of our application, so we can enhance that.

Update the chat.html file in the templates folder with the following markup:

<html>
  <head>
    <title>Chat</title>
    <style>
      input { display: block; }
      ul    { list-style: none; }
    </style>
  </head>
  <body>
    <ul id="messages"></ul>
    <form id="chatbox">
      <textarea></textarea>
      <input type="submit" value="Send" />
       </form>  </body>
</html>

The preceding HTML will render a simple web form on the page containing ...

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