1. Posted April 10, 2019 rendering conditional react components. Here’s a good article about optimizing conditional rendering in React — I totally recommend you read it. Use JavaScript operators like if or the conditional operator to create elements representing the current state, and let React update the UI to match them. Based on the example of the article, I created two JSFiddles.

Here, we are going to discuss this more details.At least, there are 7 methods of conditional rendering that we can use in React. Conditional Rendering in React… React Conditional Rendering Techniques & Best Practices. Here is how you conditionally render it using an enum object.As you can see, you need to create an enum object first called ‘ALERT_STATUS’. In javascript, we usually write conditional rendering with “if else” statement, “switch case” statement, and ternary operator.All of these methods are applicable to React. We hope this article sheds some light on ReactJS best practices and patterns that are very popular in 2019. I would like some advice as to the best practice when conditionally rendering an element or component in react-native.

When we’re developing a React application, we often need to show or hide an element given a certain situation. This way, only a one part of your JSX is conditionally rendered, while other parts can stay intact without any condition. As a bonus see another article below. Injecting if-else statement in JSX only works with As you can see, that’s too verbose for just an if statement.

in Web/Mobile App Development. We can use it anywhere in a React project.In React, using the common if-else statement is the best when you want to execute more than one line of code inside if or else block, or anywhere outside JSX.For example, we want to execute some codes if user is logged in.Or when you want to define accessible contents based of user role.if you only want to execute one line of code, like calling a function inside if or else block, you can remove the brackets like this.Condition in if-else without brackets only applied to one line of codes right below it.As you might know, we can inject and mix some javascript codes in JSX inside brackets { }.

Conditional rendering React: List of options and best practice for these patterns. But the question is, How we can use them effectively?As you might know, React has JSX markup that often we need to implement conditional logic for component there.

You want to render an alert component based on status. Consider these two components: function UserGreeting (props) {return < h1 > Welcome back! or some thoughts about the methods above?Get notified via email when new post like this published! With ternary operator, you can write the conditional rendering inline, or in only one line of code.Let’s see the example of conditional rendering for variable value assignment.And this is conditional rendering example for function return value:As you can see, you can shorten if-else statement with just one line with ternary operator.You can also use ternary operator in JSX instead of using if-else with Immediately Invoked Function Expression (IIFE).Let’s say, we want to render a small component conditionally based on In the example above I only show you how to use a ternary operator to substitute if-else statement.Ternary operator can also be used to substitute multiple conditional rendering (if – else if – else) or nested conditional rendering.However, I don’t recommend you to use this as it’s harder to read than a common if-else statement.Let’ say you want to implement nested conditional rendering in JSX.For cases like this, using IIFE, switch-case statement or enum object is better than the ternary operator.With ternary operator, you can shorten if-else statement and have better choice for conditional rendering in JSX.But, do you know that there is a simpler method than ternary operator?A Short-circuit AND Operator can be used to replace an if statement like this.In Ternary operator, even when you have no ‘else’ condition, you should keep write ‘: null’ expression to avoid error.With short-circuit && operator, you don’t have to do that.But, keep in mind that short-circuit && operator can not be used to substitute an if-else statement, let alone an if-else if-else statement.Like if-else statement, switch-case statement is also a common feature in almost every programming language.It is used for multiple conditional rendering with the same type of condition.For example, we can use a switch-case statement to render a specific variable value based on user roles.You can also use a switch-case statement for conditional rendering in JSX.

Each one of them has its own advantage in some contexts.This is the first method that all programmers know, the common if-else statement. This reduces the complexity of the components.

Then, simply call it in JSX with You can also assign the alert component to a variable.Of course, you should define the enum object first.The best thing about using an Enum object for conditional rendering is that you can make it reusable.Back to the example case, the Alert component is a component in React that usually reusable.