Book Image

Beginning React

By : Andrea Chiarelli
Book Image

Beginning React

By: Andrea Chiarelli

Overview of this book

Projects like Angular and React are rapidly changing how development teams build and deploy web applications to production. In this book, you’ll learn the basics you need to get up and running with React and tackle real-world projects and challenges. It includes helpful guidance on how to consider key user requirements within the development process, and also shows you how to work with advanced concepts such as state management, data-binding, routing, and the popular component markup that is JSX. As you complete the included examples, you’ll find yourself well-equipped to move onto a real-world personal or professional frontend project.
Table of Contents (9 chapters)

Component Lifecycle Events

In a React application, components are created dynamically, according to the evolution of the application at runtime. A user's interaction starts a component's creation, its visualization, its updates on the screen, and its destruction.

So, components go through different phases during application execution: these phases represent their lifecycles.

React allows us to intercept and manage the phases of a component's lifecycle in a customized way, thanks to a set of events that we can handle by implementing specific methods.

Before analyzing a component's lifecycle events, we should highlight that the first step in creating a component is the execution of its constructor. Although it is not one of React's lifecycle phases, it is the first step of a component's life. During the component's constructor execution, the DOM is not available, and it is not possible to access any child component. The constructor execution is the right time to perform the initializations that...