Book Image

MERN Quick Start Guide

By : Eddy Wilson Iriarte Koroliova
3 (1)
Book Image

MERN Quick Start Guide

3 (1)
By: Eddy Wilson Iriarte Koroliova

Overview of this book

The MERN stack is a collection of great tools—MongoDB, Express.js, React, and Node—that provide a strong base for a developer to build easily maintainable web applications. With each of them a JavaScript or JavaScript-based technology, having a shared programming language means it takes less time to develop web applications. This book focuses on providing key tasks that can help you get started, learn, understand, and build full-stack web applications. It walks you through the process of installing all the requirements and project setup to build client-side React web applications, managing synchronous and asynchronous data flows with Redux, and building real-time web applications with Socket.IO, RESTful APIs, and other concepts. This book gives you practical and clear hands-on experience so you can begin building a full-stack MERN web application. Quick Start Guides are focused, shorter titles that provide a faster paced introduction to a technology. They are for people who don't need all the detail at this point in their learning curve. The presentation has been streamlined to concentrate on the things you really need to know.
Table of Contents (8 chapters)

Understanding React portals

React portals allow us to render child components in a different DOM element outside of the DOM tree generated by the parent component while keeping the React tree as if the component is inside the DOM tree generated by the parent component. For instance, even though child components are located in a different DOM node, the events generated in a child component bubble up to the React parent component.

React portals are created using the ReactDOM library's createPortal method and it has the same signature as the render method:


However, the difference between render and createPortal is that the latter returns a special tag that is used in the React tree to identify this element as a React portal and to use it as if it were a React element. For instance: