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Guide Collection

React

A selection of our articles about React, the most popular JavaScript library for managing state and handling the DOM with components.

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Article

When Does a Project Need React?

You know when a project needs HTML and CSS, because it’s all of them. When you reach for JavaScript is fairly clear: when you need interactivity or some functionality that only JavaScript can provide. It used to be fairly clear when we reached for libraries. We reached for jQuery to help us simplify working with […]

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Leveling up with React: React Router

This tutorial is the first of a three-part series on React by Brad Westfall. When Brad pitched me this, he pointed out there are a good amount of tutorials on getting started in React, but not as much about where to go from there. If you’re brand new to React, I recommend watching this intro […]

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Leveling Up with React: Redux

This tutorial is the final of a three-part series by Brad Westfall. We’ll learn how to manage state across an entire application efficiently and in a way that can scale without dangerous complexity. We’ve come so far in our React journey, it’s worth making it across the finish line here and getting the full bang-for-our-buck […]

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Working With Events in React

Most of the behavior in an application revolves around events. User enters a value in the registration form? Event. User hits the submit button? Another event. Events are triggered a number of ways and we build applications to listen for them in order to do something else in response. You may already be super comfortable […]

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CSS Modules and React

In this final post of our series on CSS Modules, I’ll be taking a look at how to make a static React site with the thanks of Webpack. This static site will have two templates: a homepage and an about page with a couple of React components to explain how it works in practice.

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How React Reconciliation Works

React is fast! Some of that speed comes from updating only the parts of the DOM that need it. Less for you to worry about and a speed gain to boot. As long as you understand the workings of setState(), you should be good to go. However, it’s also important to familiarize yourself with how […]

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Creating an SVG Icon System with React

I recently went to Michael Jackson and Ryan Florence’s ReactJS Training. I was really excited to attend, partially because I had so many questions about SVG and React. There are a lot of bits about working with React and SVG, and especially manipulating it, that aren’t quite supported yet. One of the major gaps for […]

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Image Upload and Manipulation with React

The following is a guest post by Damon Bauer, who tackles a pretty common web developer job: offering user image uploads. I’d hesitate to call it easy, but with the help of some powerful tools that do a lot of the heavy lifting, this job has gotten a heck of a lot easier than it […]

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Loading and Using External Data in React

Hey JavaScripters! I’ve been learning a bunch about React lately. It’s very fun. It feels like a great way to write JavaScript. Seems to me it has almost the same feel jQuery did in the early days. Confession though: I’m not master of it. I’m about to show you how to do something in React, […]

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React State From the Ground Up

As you begin to learn React, you will be faced with understanding what state is. State is hugely important in React, and perhaps a big reason you’ve looked into using React in the first place. Let’s take a stab at understanding what state is and how it works.

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Understanding React `setState`

React components can, and often do, have state. State can be anything, but think of things like whether a user is logged in or not and displaying the correct username based on which account is active. Or an array of blog posts. Or if a modal is open or not and which tab within it […]

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An Almost Ideal React Image Component

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Digging Into React Context

You may have wondered lately what all the buzz is about Context and what it might mean for you and your React sites. Before Context, when the management of state gets complicated beyond the functionality of setState, you likely had to make use of a third party library. Thanks to recent updates by the awesome […]

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#147: Starting a React-Powered Comment Form

In this pairing screencast, Sarah Drasner joins me and guides me through some of my very first learnings of React. We tackle some “real world” style functionality: a comment form. This turned out to be a pretty useful bit of UI to work with, as it required a lot of things rather fundamental to React […]

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Managing State in React With Unstated

As your application becomes more complex, the management of state can become tedious. A component’s state is meant to be self-contained, which makes sharing state across multiple components a headache. Redux is usually the go-to library to manage state in React, however, depending on how complex your application is, you might not need Redux. Unstated […]

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React’s New Context API Explained

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React Code Style Guide

I’ve been having the time of my life with React lately. But on my journey, I’ve had a hard time finding good code style guidelines to keep the mix of JSX and JS clean and readable. I’ve been coming up with my own style guides that I’d love to share. Maybe these will be useful […]

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Putting Things in Context With React

Context is currently an experimental API for React – but soon to be a first class citizen! There are a lot of reasons it is interesting but perhaps the most is that it allows for parent components to pass data implicitly to their children, no matter how deep the component tree is. In other words, […]

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React Native: A Better DOM?