How To Handle DOM and Window Events with React

How To Handle DOM and Window Events with React

In JavaScript apps using the React front-end library, you can use event handlers to update state data, trigger prop changes, or prevent default browser actions.

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Introduction

In web development, events represent actions that happen in the web browser. By responding to events with event handlers, you can create dynamic JavaScript applications that respond to any user action, including clicking with a mouse, scrolling along a webpage, touching a touch screen, and more.

In React apps, you can use event handlers to update state data, trigger prop changes, or prevent default browser actions. To do this, React uses a SyntheticEvent wrapper instead of the native [Event](https://developer.mozilla.org/en-US/docs/Web/API/Event) interfaceSyntheticEvent closely emulates the standard browser event, but provides more consistent behavior for different web browsers. React also gives you tools to safely add and remove a [Window](https://developer.mozilla.org/en-US/docs/Web/API/Window) event listener when a component mounts and unmounts from the Document Object Model (DOM), giving you control over Window events while preventing memory leaks from improperly removed listeners.

In this tutorial, you’ll learn how to handle events in React. You’ll build several sample components that handle user events, including a self-validating input component and an informative tooltip for the input form. Throughout the tutorial, you’ll learn how to add event handlers to components, pull information from the SyntheticEvent, and add and remove Window event listeners. By the end of this tutorial, you’ll be able to work with a variety of event handlers and apply the catalog of events supported by React.

Prerequisites

react

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