app.js

// Binding to Pusher Events on our 'presence-whatsup-members' Channel

  function bindChannelEvents(channel){
      channel.bind('client-status-update',statusUpdated);
      var reRenderMembers = function(member){
        renderMembers(channel.members);
      }
      channel.bind('pusher:subscription_succeeded', reRenderMembers);
      channel.bind('pusher:member_added', reRenderMembers);
      channel.bind('pusher:member_removed', reRenderMembers);
    }