If you’re just starting out with React, you might soon get to the point where you want to dynamically change the styling of some React Elements – e.g. at the click of a button. In this post we have a closer look at this concept. Continue reading How to dynamically add CSS Classes to React Elements using State
Did you ever ask yourself, if it makes sense to test presentational components, or if it’s just too time consuming? Good news, you’re not alone! That’s why I put together three ways to create useful Jest tests for your presentational components without spending too much time.
This might sound familiar to you: You run your React app after you made some changes to test your new functionality and get an error message like this: “this.setState’ is not a function“. It’s probably because you forgot to bind a callback function before passing it down a prop. Today you’ll learn why you need to bind, and how to bind a callback function in React.
If you’re a developer who – like me – is not a good designer or a CSS pro, you might know how troublesome it can be to put together the design for your React app. You spend a lot of time tinkering with the styles, but in the end, it just doesn’t look quite nice.
Hello again! Did you ever try to display data from a remote backend in your React app? In the third part of this article series, you will learn how to fetch data from a REST API and use it inside your app.
Today we’re going to create a React list component, that renders a list of Contact components. You’ll learn how to create functional stateless components and how to pass props from a parent component.
Setting up a React app can be confusing, since you have to take care of a lot of stuff that you don’t want to think about—at least at the beginning of your React journey. Fortunately there is a tool called create-react-app that is a neat shortcut. It allows you to start developing right away without having to worry about stuff like webpack and/or babel.
React beginners often have a hard time learning React, since the React ecosystem seems huge. You will inevitably stumble upon stuff like Redux, Webpack or Babel very early. At this point I was so overwhelmed because I had no clue where to start first.
It was even more confusing that I didn’t even know the problems that those tools tried to solve. Today I know better and I’m going to tell you that there is no need for any of these – at least not yet.
Functional components are simpler and easier to test in comparison to class components. However, both of them have pros and cons and today you’ll learn the differences and when to use which type of components.
React PropTypes are a good way to help you catching bugs by validating data types of values passed through props. They also offer possibilities to flag props as mandatory or set default values. They provide a great benefit with little effort.