screen_rotation
Copied to Clipboard
<!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 [error, setError] = useState(''); const handleInputChange = (e) => { const { value } = e.target; const alphanumericRegex = /^[a-zA-Z0-9\s]+$/; if (value === '' || alphanumericRegex.test(value)) { setInputValue(value); setError(''); } else { setError('Please enter only alphanumeric characters and spaces.'); } }; return ( <div className='container'> <h1>React Js Input field allow only alphanumeric letter </h1> <input type="text" value={inputValue} onChange={handleInputChange} placeholder="Enter alphanumeric value" /> {error && <p style={{ color: 'red' }}>{error}</p>} </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; } h1 { font-size: 24px; margin-bottom: 20px; } input { padding: 10px; width: 300px; border: 1px solid #ccc; border-radius: 4px; font-size: 16px; transition: border-color 0.3s ease; } input:focus { outline: none; border-color: dodgerblue; } p { margin-top: 10px; font-size: 14px; } </style> </body> </html>