How do I handle forms in React?

How do I handle forms in React?

In React, you can handle forms using controlled components, where form data is handled by the component's state.

Can you give me an example of a controlled component?

Sure! Here's a simple example:

function MyForm() {
  const [inputValue, setInputValue] = useState('');

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

  const handleSubmit = (event) => {
    event.preventDefault();
    alert('A name was submitted: ' + inputValue);
  };

  return (
    <form onSubmit={handleSubmit}>
      <label>
        Name:
        <input type="text" value={inputValue} onChange={handleChange} />
      </label>
      <button type="submit">Submit</button>
    </form>
  );
}

This code creates a simple form with a controlled input.

What if I want to handle multiple inputs?

You can manage multiple inputs by using an object in the state to hold the values. Here's an example:

function MyForm() {
  const [formData, setFormData] = useState({ name: '', email: '' });

  const handleChange = (event) => {
    const { name, value } = event.target;
    setFormData({ ...formData, [name]: value });
  };

  const handleSubmit = (event) => {
    event.preventDefault();
    alert('Form submitted: ' + JSON.stringify(formData));
  };

  return (
    <form onSubmit={handleSubmit}>
      <label>
        Name:
        <input type="text" name="name" value={formData.name} onChange={handleChange} />
      </label>
      <label>
        Email:
        <input type="email" name="email" value={formData.email} onChange={handleChange} />
      </label>
      <button type="submit">Submit</button>
    </form>
  );
}

This allows you to handle multiple inputs easily.