import { useRef } from "react"; import ReactDOM from "react-dom/client"; function App() { const inputElement = useRef(); const focusInput = () => { inputElement.current.focus(); }; return ( <> <input type="text" ref={inputElement} /> <button onClick={focusInput}>Focus Input</button> </> ); } const root = ReactDOM.createRoot(document.getElementById('root')); root.render(<App />);