相关疑难解决方法(0)

我有这个代码：

const App: React.FC = () => {
  const [isOpen, setIsOpen] = React.useState(true);
  const [maxHeight, setMaxHeight] = React.useState();

  const wrapper = React.useRef<HTMLDivElement>(null);
  const content = React.useRef<HTMLDivElement>(null);

  const setElementMaxHeight = () => {
    if (content && content.current) {
      setMaxHeight(isOpen ? content.current.offsetHeight : 0);
    }
  };

  useEffect(() => {
   setElementMaxHeight();

    window.addEventListener("resize", setElementMaxHeight);

    return () => {
      window.removeEventListener("resize", setElementMaxHeight);
    };
  });

  const toggle = () => {
    setIsOpen(!isOpen);
  };

  return (
    <div>
      <button onClick={toggle}>
        <span className="nominal-result__expander fa" />
      </button>
      <div
        className="nominal-results__list-wrapper"
        ref={wrapper}
        style={!!maxHeight …