How to Inject Multiple CSS Classes into ReactJS Components?

Injecting Multiple Classes into ReactJS Components

In ReactJS, the className attribute allows us to define CSS classes to style elements. When working with multiple classes, it's crucial to understand how to efficiently and dynamically add them.

Issue:

A beginner encounters an issue while trying to assign multiple classes to a className attribute within an li element:

<li key={index} className={activeClass, data.class, "main-class"}></li>

Solution:

To resolve this issue, we leverage ES6 template literals:

const classes = `active ${data.class} main-class`;

By enclosing multiple classes within backticks and joining them with spaces, we create a dynamic string of classes that can be assigned to the className attribute:

<li key={index} className={classes} onClick={self.clicked.bind(self, index)}></li>

Example:

const errorMessage = this.state.error ? "error" : "";
const inputClasses = `form-control ${errorMessage}`;

Then, we simply render the input:

<input className={inputClasses} />

This method provides a straightforward and versatile approach to inject multiple classes into ReactJS components, enhancing flexibility and code readability.

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