1.show.html

<div ng-controller='ChatCtrl'>
  <div id='messages' ng-repeat="chat_message in chat_messages">
    {{chat_message.text}}
  </div>
</div>

2.visitor_chat_controller.js.coffee

ChatCtrl = ($scope) -> 
  $scope.chat_messages = []


  # Subscribe to the chat client
  SubscribeToChat.new(
    {# Chat settings},    
    (m) ->
      # Callback when new chat is received
      $scope.chat_messages.unshift(m)
  )

  $publish() ->
   # Send chat message to the chat server

3.moderator_chat_controller.js.coffee

ChatCtrl.prototype.remove = ($scope) ->
  # Logic to remove chat messages