Node.JS Why doesn't the script work on display none?

Question

JavaScript

Hello. I have some code that is supposed to send two and text to the server, then the server sends them back, after which I would like one of them to disappear (display:none or .hide() ), but that doesn't happen, why? There are no errors in the console, and the text is displayed perfectly.
client

usernameWindw = $(".usernameWindow");
chatWindw = $(".chatWindow");
$nickname = $("#nick_Name").val();

    //ОТПРАВКА НА СЕРВЕР
    function requestSubmitNickname() {
      socket.emit('requestSetNickName', chatWindw, usernameWindw, $nickname);
    }

    //ПОЛУЧЕНИЕ С СЕРВЕРА
    socket.on('setNickName', function(chatWin, userWin, username_text){
      $username = username_text;
      $(userWin).hide();
      $(chatWin).show();
      console.log(username_text);
    });

SERVER

//ОТПРАВКА КЛИЕНТУ
  socket.on('requestSetNickName', function(chatWind, usernameWind, nickname){
    io.sockets.emit('setNickName', chatWind, usernameWind, nickname);
  });

Answer 1

Do you send items?
And what should you get in return? what's in userWin and chatWin? If layout, then it simply creates jQuery instances and hide / show them, and since they are not in the DOM tree, you don’t see anything. If id or class, then
$('.'+userWin).hide(); or $('#'+userWin).hide();