anchor.diff:  	usernameInput = querySelector('#login-username');
   	passwordInput = querySelector('#login-pass');
   	loginButton = querySelector('#login-button');
  -	
  +
   	rightButton = querySelector('#right-button');
   	upButton = querySelector('#up-button');
   	downButton = querySelector('#down-button');
  
positive.code: 		//TODO
  		changeDisplayMessage("Succeeded in longing!");
  		auth = true;
  	} else {
  		changeDisplayMessage("Failed to Login :" + message.value["error"]);
  	}
  }
  
  
negative.code: InputElement passwordInput,usernameInput;
  ButtonElement loginButton,rightButton,leftButton,upButton,downButton;
  
  
  var wsClient = new WebSocket('ws://ec2-52-68-77-61.ap-northeast-1.compute.amazonaws.com:3000');
  bool auth = false;
  
  var cameraID = "";
  
  /// Class of websocket message 
  class webSocketMessage {
  	/// Message Type
  	String type;
  	/// Message Value
  	Map value;
  
  	@override
  		String toString(){
  			Map map = new Map();
  			map["type"] = type;
  			map["value"] = value;
  			return JSON.encode(map);
  		}
  
  	webSocketMessage(this.type,this.value);
  
  