React Js Add Element or Items to Array by using Input Field

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
       function App() {
            const { useState } = React;
            const [items, setItems] = useState(['Apple', 'Mango']); // State to hold the array of items
            const [inputValue, setInputValue] = useState(''); // State to hold the input field value

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

<ul>
                        {items.map((item, index) => (
                            <li key={index}>{item}</li>
                        ))}
                    </ul>
                </div>

);
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>

.container {

padding: 20px;

border-radius: 8px;
        }

h3 {
            font-size: 24px;
            margin-bottom: 20px;
        }

.form {
            display: flex;
            margin-bottom: 20px;
        }

input[type="text"] {
            flex: 1;
            padding: 8px;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-size: 16px;
        }

button {
            padding: 8px 16px;
            border: none;
            border-radius: 4px;
            background-color: #4caf50;
            color: #fff;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

button:hover {
            background-color: #45a049;
        }

ul {
            list-style-type: none;
            padding: 0;
        }

li {
            margin-bottom: 8px;
            font-size: 16px;
        }
    </style>
</body>

</html>

xxxxxxxxxx
 
<!DOCTYPE html>
<html>
​
<head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
</head>
​
<body>
    <div id="app"></div>
    <script type="text/babel">
       function App() {
            const { useState } = React;
            const [items, setItems] = useState(['Apple', 'Mango']); // State to hold the array of items
            const [inputValue, setInputValue] = useState(''); // State to hold the input field value
​
            const handleInputChange = (event) => {
                setInputValue(event.target.value);
            };
​
            const handleAddItem = () => {
                if (inputValue.trim() !== '') {
                    setItems((prevItems) => [...prevItems, inputValue]);
                    setInputValue(''); // Clear the input field after adding the item
                }
            };
           return (
                <div className='container'>
                    <h3>React Js Add Element or Items to Array bu Input field</h3>
                    <div className='form'>
                        <input type="text" value={inputValue} onChange={handleInputChange} />
                        <button onClick={handleAddItem}>Add Item</button>
                    </div>
​
                    <ul>
                        {items.map((item, index) => (
                            <li key={index}>{item}</li>
                        ))}
                    </ul>
                </div>
​
            );
        }
​
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>
​
    <style>
        #app {
            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);
        }
​
        .container {
​
            padding: 20px;
​
            border-radius: 8px;
        }
​
        h3 {
            font-size: 24px;
            margin-bottom: 20px;
        }
​
        .form {
            display: flex;
            margin-bottom: 20px;
        }
​
        input[type="text"] {
            flex: 1;
            padding: 8px;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-size: 16px;
        }
​
        button {
            padding: 8px 16px;
            border: none;
            border-radius: 4px;
            background-color: #4caf50;
            color: #fff;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
​
        button:hover {
            background-color: #45a049;
        }
​
        ul {
            list-style-type: none;
            padding: 0;
        }
​
        li {
            margin-bottom: 8px;
            font-size: 16px;
        }
    </style>
</body>
​
</html>