React Check if Input is Empty

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState } = React;

function App() {
            const [inputValue, setInputValue] = useState('');

const handleInputChange = (event) => {
                setInputValue(event.target.value);
            };

const handleSubmit = (event) => {
                event.preventDefault();

if (inputValue.trim() === '') {
                    // Input is empty
                    alert('Input is empty!');
                    return;
                }

// Input is not empty
                console.log('Input is not empty:', inputValue);
            };

return (
                <div className="container">
                    <h3>React Js Check if Input Field is Empty</h3>
                    <form onSubmit={handleSubmit}>
                        <input
                            type="text"
                            value={inputValue}
                            onChange={handleInputChange}
                        />
                        <button type="submit">Submit</button>
                    </form>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

form {
            display: flex;
            align-items: center;
        }

input[type="text"] {
            flex: 1;
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 3px;
            margin-right: 10px;
        }

button[type="submit"] {
            padding: 10px 20px;
            font-size: 16px;
            background-color: #4caf50;
            color: #fff;
            border: none;
            border-radius: 3px;
            cursor: pointer;
        }

button[type="submit"]:hover {
            background-color: #45a049;
        }
    </style>
</body>

</html>