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React stat and Socket.io

I have this component in which I want to update a state and make an array with al the users connected in a room from an incoming msg from socket.on:

export default function ChatRoom() {
  const [users, setUsers] = useState([]);
  const { state } = useLocation(); //to get data from <Home/> component


  socket.on("message", (msg) => console.log(msg));

  useEffect(() => {
    if (state.connected) {
      socket.on("userconnected", (msg) => {
        setUsers((old) => [...old, msg]);

        console.log(state.username);
      });
    }
  }, [state.connected, users]);

The username is coming from another component state in which I send a msg to the server:

export default function Home() {
  const [username, setUsername] = useState("");
  const [room, setRoom] = useState("");
  const [connected, setConnected] = useState(false);

  useEffect(() => {
    if (connected && room && username) {
      navigate("/chatroom", {
        state: { username, room, connected },
      });
    }
  }, [connected, room, username]);

  const navigate = useNavigate();

  const handleClick = (e) => {
    e.preventDefault();
    socket.emit("connected", username);
    setConnected(true);
  };

The problem is that I cant update the state with setUsers. I think it has to do with an async problem but I can´t figure it out. Basically I need an array with all the users that are connected.

about 4 years ago · Juan Pablo Isaza
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