BP235: Use Controlled Components

Use Controlled Components in React for better control over form inputs. Controlled components are React components that render a form element and control its value by keeping it in the component's state. This means that the value of the input is always controlled by the component, rather than the DOM.

This is useful because it allows you to have more control over the form input's behavior and validation. For example, you can easily validate the input value before submitting the form, or you can prevent the user from entering invalid characters. Additionally, it makes it easier to share the input value between multiple components or to persist it across page refreshes.

Here's an example of a controlled component that renders an input element and updates its value in the component's state:

{`import React, { useState } from 'react';

function ControlledInput() {
  const [value, setValue] = useState('');

  function handleChange(event) {
    setValue(event.target.value);
  }

  return (
    <input type="text" value={value} onChange={handleChange} />
  );
}`}

In this example, the input element's value is controlled by the component's state variable, `value`. The `handleChange` function updates the value in the state whenever the user types in the input. This ensures that the input value is always in sync with the component's state.

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