How do React Hooks work & what does the React Hook Form mean?
React Hooks are a new feature in React 16.8 that allows you to write stateful components in a functional way, without having to use class components. There are several built-in hooks in React, and you can also write your own custom hooks.
Hooks allow the function components to have access to the state and other React features. Because of this, class components are generally no longer needed.
Here are some of the most commonly used built-in hooks in React:
useState: This hook lets you add a state to your functional components. It returns an array with two elements: the current state and a function to update it.
useEffect: This hook lets you perform side effects in your functional components, such as making an API call or updating the DOM after a state change.
useContext: This hook lets you access the context object and subscribe to its updates. It takes a context object as its argument and returns the current value of the context.
useReducer: This hook is similar to useState, but it can handle more complex state transitions and updates. It takes a reducer function as its first argument and returns the current state and a dispatch function to update it.
useCallback: This hook returns a memoized version of a callback function that only changes when one of its dependencies changes. This can be useful for optimizing performance in your React components.
By using these hooks, you can write clean, reusable, and performant code in your React components.
Rules Of Hooks:
- Only Call the Hooks at the Top Level
- Don’t call the Hooks inside loops, inside conditions, or inside nested functions.
- Call the Hooks from React function components.
- Call the Hooks from the custom Hooks
React Form
React Hook Form is a library that provides a simple and efficient way of handling forms in React. It offers a set of hooks for managing form state, validation, and error handling, allowing you to write clean and reusable form logic.
Here’s a basic example of how to use React Hook Form to create a form:
npm install react-hook-form import React from 'react'; import { useForm } from 'react-hook-form'; const FormExample = () => { const { register, handleSubmit, errors } = useForm(); const onSubmit = data => { console.log(data); }; return ( <form onSubmit={handleSubmit(onSubmit)}> <input name="name" placeholder="Name" ref={register({ required: true })} /> {errors.name && <p>This field is required</p>} <input type="email" name="email" placeholder="Email" ref={register({ required: true })} /> {errors.email && <p>This field is required</p>} <button type="submit">Submit</button> </form> ); }; export default FormExample;
In this example, the useForm hook is used to manage form state and behavior. The register method is used to register form inputs, and the handleSubmit method is used to handle form submissions. The error object returned by the hook is used to display error messages.
React Hook Form also provides advanced features such as custom validation logic and support for controlled and uncontrolled components.