How Can I Add Multiple Classes to a ReactJS Component's className Attribute?

Multiple Classes in ReactJS Components: A Detailed Solution

When working with ReactJS and JSX, adding multiple classes to a component's className attribute can be a common task. This article demonstrates how to achieve this with ES6 template literals, offering a clean and concise solution.

Consider the following snippet:

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

This code attempts to concatenate multiple class names into the className attribute, but it incorrectly assigns them as separate arguments to the className property. Instead, we need to use template literals to create a string that contains the desired classes.

Here's the revised code using ES6 template literals:

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

By enclosing the class names within curly braces inside the backticks, we can concatenate them into a single string. The className property then receives this dynamically generated string, ensuring that the component has all the specified classes.

Another convenient method is the one-liner version:

<li key={index} className={`form-control round-lg ${this.state.valid ? '' : 'error'}`}></li>

We use a conditional expression inside the backticks to toggle between classes based on a condition. In this example, an 'error' class is added only if the valid state property is false.

These techniques provide a simple and elegant solution for adding multiple classes to ReactJS components, making it easier to style and enhance the functionality of your applications.

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