React Display Form Fields Based On Dropdown Selection

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <script src="https://unpkg.com/react@17.0.2/umd/react.production.min.js"></script>
  <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.production.min.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">
    const { useState } = React;

const App = () => {
      const [contactMethod, setContactMethod] = useState('');
      const [email, setEmail] = useState('');
      const [phone, setPhone] = useState('');

const handleContactChange = (event) => {
        setContactMethod(event.target.value);
      };

const handleEmailChange = (event) => {
        setEmail(event.target.value);
      };

const handlePhoneChange = (event) => {
        setPhone(event.target.value);
      };

return (
        <div className='container'>
          <h1>React Js Show or hide input fields based on select value</h1>
          <h2>Contact Information</h2>
          <label>
            Preferred Contact Method:
            <select value={contactMethod} onChange={handleContactChange}>
              <option value="">Select an option</option>
              <option value="email">Email</option>
              <option value="phone">Phone</option>
              <option value="none">None</option>
            </select>
          </label>

{contactMethod === 'email' && (
            <label>
              Email:
              <input type="email" value={email} onChange={handleEmailChange} />
            </label>
          )}

{contactMethod === 'phone' && (
            <label>
              Phone:
              <input type="tel" value={phone} onChange={handlePhoneChange} />
            </label>
          )}
        </div>
      );

}

ReactDOM.render(<App />, document.getElementById('app'));
  </script>
  <style>
    /* Styles for the container and button */
    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

/* Styling for the select element */
    select,
    input[type="email"],
    input[type="tel"] {
      width: 100%;
      padding: 10px;
      margin-bottom: 10px;
      border: 1px solid #ccc;
      border-radius: 4px;
      font-size: 16px;
      outline: none;
    }

/* Styling for the option elements */
    .container option {
      font-size: 16px;
    }

label {
      display: block;
      margin-bottom: 10px;
    }
  </style>
</body>

</html>

 
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <script src="https://unpkg.com/react@17.0.2/umd/react.production.min.js"></script>
  <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.production.min.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">
    const { useState } = React;
​
    const App = () => {
      const [contactMethod, setContactMethod] = useState('');
      const [email, setEmail] = useState('');
      const [phone, setPhone] = useState('');
​
      const handleContactChange = (event) => {
        setContactMethod(event.target.value);
      };
​
      const handleEmailChange = (event) => {
        setEmail(event.target.value);
      };
​
      const handlePhoneChange = (event) => {
        setPhone(event.target.value);
      };
​
      return (
        <div className='container'>
          <h1>React Js Show or hide input fields based on select value</h1>
          <h2>Contact Information</h2>
          <label>
            Preferred Contact Method:
            <select value={contactMethod} onChange={handleContactChange}>
              <option value="">Select an option</option>
              <option value="email">Email</option>
              <option value="phone">Phone</option>
              <option value="none">None</option>
            </select>
          </label>
​
          {contactMethod === 'email' && (
            <label>
              Email:
              <input type="email" value={email} onChange={handleEmailChange} />
            </label>
          )}
​
          {contactMethod === 'phone' && (
            <label>
              Phone:
              <input type="tel" value={phone} onChange={handlePhoneChange} />
            </label>
          )}
        </div>
      );
​
    }
​
    ReactDOM.render(<App />, document.getElementById('app'));
  </script>
  <style>
    /* Styles for the container and button */
    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
​
    /* Styling for the select element */
    select,
    input[type="email"],
    input[type="tel"] {
      width: 100%;
      padding: 10px;
      margin-bottom: 10px;
      border: 1px solid #ccc;
      border-radius: 4px;
      font-size: 16px;
      outline: none;
    }
​
    /* Styling for the option elements */
    .container option {
      font-size: 16px;
    }
​
    label {
      display: block;
      margin-bottom: 10px;
    }
  </style>
</body>
​
</html>