CSS Emotion CSS-in-JS – How to Add Conditional CSS Based on Component Properties

In this article, we will introduce CSS Emotion CSS-in-JS library and how to add conditional CSS based on component properties. CSS Emotion is a popular CSS-in-JS solution that allows us to write styles in JavaScript and apply them by generating inline styles or style tags.

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What is CSS Emotion CSS-in-JS?

CSS Emotion is a library for writing CSS in React applications. It provides a syntax similar to CSS, by writing styles in JavaScript and applying them in components as needed. CSS Emotion achieves this using the Emotion library, which is a dependency library for writing CSS in JavaScript.

CSS Emotion provides a way to handle dynamic styles and component properties for conditional rendering. We can dynamically apply different styles based on the value of a component property, thus achieving conditional CSS effects.

How to add conditional CSS based on component properties?

To add conditional CSS based on component properties, we need to first install and import the CSS Emotion library. CSS Emotion can be installed via NPM or Yarn:

npm install @emotion/react 
npm install @emotion/styled 

Next, we need to import the required library into the component that will use CSS Emotion:

import { css } from '@emotion/react'; 
import styled from '@emotion/styled'; 

Now, we can define styles using CSS functions and apply them to our components. To add conditional CSS based on component properties, we can use JavaScript’s conditional statements to decide which styles should be applied.

Here’s an example showing how to add conditional CSS based on component properties:

import React from 'react'; 
import { css } from '@emotion/react'; 

const Button = ({ primary }) => { 
const buttonStyles = css` 
padding: 10px 20px; 
font-size: 16px; 
background-color: ${primary ? 'blue' : 'red'}; 
color: white; 
border: none; 
border-radius: 4px; 
cursor: pointer; 
`; 

return ( 
<button css={buttonStyles}> 
{primary ? 'Primary Button' : 'Secondary Button'} 
</button> 
); 
}; 

export default Button; 

In the example above, we define a component called Button that accepts a primary property. Based on the value of the primary property, we use a conditional statement to determine the button’s background color. If primary is true, the background color will be blue; if false, the background color will be red. Other style properties can be conditionally set in a similar manner.

Summary

CSS Emotion is a powerful CSS-in-JS library that helps us add conditional CSS based on component properties in React applications. By using CSS Emotion, we can write styles using a CSS-like syntax and apply them to components.

To add conditional CSS based on component properties, we can use JavaScript conditionals to determine which styles should be applied. CSS Emotion’s flexibility allows us to dynamically apply styles based on specific component needs. Whether based on specific conditions or user interaction, we can use CSS Emotion to create dynamic and interactive styled components.

I hope this article helped you understand how to use CSS Emotion to add conditional CSS based on component properties and provided useful tips and guidance for your next React project.