Create a broadcaster panel

Next let’s put together the Live Dashboard Extension that will only appear on the broadcaster’s live dashboard after they have activated the extension (for example, Muxy Live Dashboard).

This page displays a text box and button that allows the broadcaster to enter message text and broadcast it to viewers who are running the Viewer Extension.

Broadcaster Live Dashboard Code


The source code for this extension is in the HelloWorld example, in the file live.html.

We'll go through it step by step.

<html>
  <head>
    <!-- This predefined script loads and initializes the Muxy SDK. -->
    <script src="//ext-cdn.muxy.io/medkit/latest/medkit.umd.js"></script>

    <!-- This script defines the functionality. -->
    <script type="text/javascript">
      /*
       * Here we are using the debug system to give the SDK a hint that this will run on the
       * broadcaster's dashboard and have the same rights a broadcaster does. This is only
       * needed and used when developing an extension. Once it is deployed to production, the
       * backend uses the correct rights from the extension system. You can leave these
       * lines in - they are ignored when running in production.
       */
      const opts = new Muxy.default.DebuggingOptions();
      opts.channelID('126955211').role('broadcaster');
      Muxy.debug(opts);

      Muxy.setup({ clientID: 'replaceme' });
      const sdk = new Muxy.SDK();

      /*
       * This function provides the button behavior. It sets the message ID, updates the message text, 
       * and publishes the message to subscribers (viewers).
       */
      function changeMotd() {
        const motd = document.querySelector('#motd').value;

        /*
         * We wait for the SDK to confirm it is loaded each time the button is clicked. In a
         * real extension you may want a more robust solution, although there is no harm in
         * calling this function multiple times.
         */
        sdk.loaded().then(() => {
          /*
           * First we send the updated message state to the backend. This ensures that future
           * requests to get the extension state will have the most recent message.
           */
          sdk.setChannelState({
            motd: motd
          });

          /*
           * Then we broadcast an event to all current viewers with the new message. This
           * allows the panel extension to update its message without continuously polling
           * the backend.
           */
          sdk.send('motd', { motd: motd });
        });
      }
    </script>
  </head>

  <!--
    Not much markup is needed. 
    The component displays a text input box and the button that sends the message.
  -->
  <body>
    <textarea id="motd">Hello, world!</textarea>
    <p>
      <button onclick="changeMotd()">Set MOTD</button>
    </p>
  </body>
</html>