How do I handle form validation in React?

How do I handle form validation in React?

You can handle form validation in React using controlled components and state management. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

import React, { useState } from 'react';

const MyForm = () => {
  const [name, setName] = useState('');
  const [error, setError] = useState('');

  const handleSubmit = (e) => {
    e.preventDefault();
    if (!name) {
      setError('Name is required');
    } else {
      setError('');
      // Submit form
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      <input 
        type="text" 
        value={name} 
        onChange={(e) => setName(e.target.value)} 
      />
      {error && <span>{error}</span>}
      <button type="submit">Submit</button>
    </form>
  );
};

This code checks if the name field is empty and displays an error message if it is.

What libraries can I use for more complex validation?

For more complex validation, you can use libraries like Formik or React Hook Form, which provide built-in validation support.