will be returned. You can build Single Page Applications (SPA) that are dynamic and highly interactive with React. Here’s the Fiddle to try it out: The main render method is more readable this way, but maybe it isn’t necessary to use if/else blocks (or something like a switch statement) and secondary render methods. It is the easiest way to have a conditional rendering in React in the render method. Logical && (Short Circuit Evaluation with &&) Short circuit evaluation is a technique used to ensure … But when they do, you’ll need a good understanding of how React works with the virtual DOM and a few tricks to optimizing performance. Family man, Java and JavaScript developer. At this point, you will have a React application that displays a Login and a Logout button. There are numerous ways to do this in React, depending on the situation. Now, let’s consider using a second short circuit evaluation for the Login button: This code would render the right button based on the value of isLoggedIn. Start with using create-react-app to generate a React App: Next, open the App.js file in your code editor. {isLoggedIn ? In React, it allows us to render different elements or components based on a condition. b : c) As a final option, we can take advantage of the shorthand nature of the … Otherwise, it will execute the actions contained in the else block. This code extracts the logic from JSX into a function renderAuthButton. Let us now create a page in React which will have a Message and a Button. It is restricted … 2 minutes read Rendering React components is very important since it can make your app behave faster or slower, depending on your approach for rendering components, re-rendering components based on condition or state/props change. For example, you could use the ternary operator this way: Better yet, you could use a short-circuit &&: You could also encapsulate the rendering of the child elements in a method and use an if or switch statement to decide what to return: Today, most experienced React developers use Hooks to write components. In this tutorial, we are going to learn about how to loop through array of elements in a react. ), and return whatever you want to render. You can use fragments with their traditional syntax: That said, when it comes to rendering multiple elements with fragments depending on a condition, you can use any of the techniques described in this article. You can decide which one is best for your situation based on: And, all things being equal, always favor simplicity and readability. Rendering with && Let's look at one of the most common cases: conditionally rendering a React element based on whether a specific prop exists or not. This tutorial covers the most popular ways to implement conditional rendering in React: We’ll also review some tips and best practices for implementing conditional rendering in React, including: To demonstrate how all these methods work, we’ll implement a component with a view/edit functionality: You can try and fork all the examples in JSFiddle. You can conditionally assign elements or components to these variables outside the JSX and only render the variable within JSX. Let's start talking about conditional rendering, multiple times you will need to render something in React based on a condition and if the condition is false render a different thing. The first one uses an if/else block to show/hide the SubHeader component: The second one uses the short circuit operator (&&) to do the same: Open the Inspector and click on the button a few times. Final Words. https://blog.hackages.io/conditionally-wrap-an-element-in-react-a8b9a47fab2