anchor.diff:      changeDisplayMessage("Succeeded in longing!");
       auth = true;
       selectDiv.children.clear();
  -    usernameInput.value = "";
  -    passwordInput.value = "";
       childListRequest();
     } else {
  -    changeDisplayMessage("Failed to Login :" + message.value["error"]);
  +    changeDisplayMessage("ログインに失敗しました:" + message.value["error"]);
     }
   }
   
  
positive.code:       button.type = "button";
        button.onClick.listen((Event e){
          cameraID = guid;
          changeDisplayMessage("You choice camera " + guid);
          removeOrAppendButton(name);
        });
        selectDiv.children.add(button);
  
negative.code:   });
  
    if (cameraChildIdMap.isEmpty) {
      changeDisplayMessage("カメラ子機を持っていません");
    } else {
      cameraChildIdMap.forEach((guid,name){
        InputElement button = new InputElement();
  