Change only the markup that is concerned with the conditional rendering.Do not change the position of components arbitrarily in order to prevent components from unmounting and remounting unnecessarily.Selecting a Conditional Rendering ApproachĪs a general rule, it is best to ensure that in implementing conditional rendering you: It is probably always better to just write JavaScript than add an extra dependency over something so trivial. However, this approach is not recommended as the code you write is eventually transpiled to a regular JavaScript conditional. And replace the contents with the following lines of code: Next, open the App.js file in your code editor. npx create-react-app react-conditional-rendering-example.Start with using create-react-app to generate a React App: If the user is logged in, it will display a Logout button. If the user is logged out, it will display a Login button. Setting Up the Sample ProjectĬonsider an application that requires a user to log in. This tutorial was verified with Node v15.6.0, npm v7.4.0, and react v17.0.1. Node.js installed locally, which you can do by following How to Install Node.js and Create a Local Development Environment.You can check out our How To Code in React.js series. An understanding of importing, exporting, and rendering React components. ![]() You can consult the How To Code in JavaScript series to learn more. An understanding of JavaScript variables and functions.In this article, you will examine seven ways to implement conditional rendering in React applications. Handling authentication and authorization.This concept is applied often in the following scenarios: In React, it allows us to render different elements or components based on a condition. One feature that allows for this is conditional rendering.Ĭonditional rendering is a term to describe the ability to render different user interface (UI) markup if a condition is true or false. You can build Single Page Applications (SPA) that are dynamic and highly interactive with React.
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