Phone Number Validation In React Js

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel" data-presets="env,react">
        const { useState } = React;
        function App() {
            const [phoneNumber, setPhoneNumber] = useState('');
            const [isValid, setIsValid] = useState(true);

const handleChange = (e) => {
                setPhoneNumber(e.target.value);
                setIsValid(true);
            };

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

// Regex pattern for validating USA phone numbers
                const phonePattern = /^\+?1?[-.\s]?$?(\d{3})$?[-.\s]?(\d{3})[-.\s]?(\d{4})$/;

if (!phonePattern.test(phoneNumber)) {
                    setIsValid(false);
                    return;
                }

// Phone number is valid, do something with it
                console.log('Phone number:', phoneNumber);
            };

return (
                <form class='container' onSubmit={handleSubmit}>
                    <h3>React Js Validate Phone Number for USA</h3>
                    <input
                        type="text"
                        value={phoneNumber}
                        onChange={handleChange}
                        placeholder="Enter phone number"
                    />
                    {!isValid && <p style={{ color: 'red' }}>Invalid phone number</p>}
                    <button type="submit">Submit</button>
                </form>
            );
        }

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

h3 {
            font-size: 24px;
            margin-bottom: 10px;
        }

input[type="text"] {
            width: 100%;
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 4px;
            margin-bottom: 10px;
            box-sizing: border-box;
        }

.container p {
            color: red;
            margin-bottom: 10px;
        }

.container button[type="submit"] {
            padding: 10px 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
        }
    </style>
</body>

</html>

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<!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" data-presets="env,react">
        const { useState } = React;
        function App() {
            const [phoneNumber, setPhoneNumber] = useState('');
            const [isValid, setIsValid] = useState(true);
​
            const handleChange = (e) => {
                setPhoneNumber(e.target.value);
                setIsValid(true);
            };
​
            const handleSubmit = (e) => {
                e.preventDefault();
​
                // Regex pattern for validating USA phone numbers
                const phonePattern = /^\+?1?[-.\s]?\(?(\d{3})\)?[-.\s]?(\d{3})[-.\s]?(\d{4})$/;
​
                if (!phonePattern.test(phoneNumber)) {
                    setIsValid(false);
                    return;
                }
​
                // Phone number is valid, do something with it
                console.log('Phone number:', phoneNumber);
            };
​
            return (
                <form class='container' onSubmit={handleSubmit}>
                    <h3>React Js Validate Phone Number for USA</h3>
                    <input
                        type="text"
                        value={phoneNumber}
                        onChange={handleChange}
                        placeholder="Enter phone number"
                    />
                    {!isValid && <p style={{ color: 'red' }}>Invalid phone number</p>}
                    <button type="submit">Submit</button>
                </form>
            );
        }
​
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>
​
    <style>
        .container {
            margin: 0 auto;
            width: 500px;
            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;
        }
​
        h3 {
            font-size: 24px;
            margin-bottom: 10px;
        }
​
        input[type="text"] {
            width: 100%;
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 4px;
            margin-bottom: 10px;
            box-sizing: border-box;
        }
​
        .container p {
            color: red;
            margin-bottom: 10px;
        }
​
        .container button[type="submit"] {
            padding: 10px 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            cursor: pointer;
        }
    </style>
</body>
​
</html>