Callback When Gist Unread Messages Count Changes.html

<!-- place this script tag after the Gist tracking code -->
<script>
// open the Messenger widget when you receive a message
document.addEventListener('gistChatReady', function () {
  document.addEventListener("onGistUnreadCountChange", function(e) {
    if (window.gistUnreadCount > 0 || $('.gist-messenger-iframe').css('display') === 'block') {
      gist.chat("showLauncher");
    } else {
      gist.chat("hideLauncher");
    }
  });
});
</script>