How to Add Multiple Classes to a ReactJS Component with Template Literals?

Adding Multiple Classes to ReactJS Components Using Template Literals

To add multiple classes to a component in ReactJS, you can utilize ES6 template literals. This method provides a concise and efficient way to combine strings and variables into a single expression.

Step 1: Define Class Variables

Within your component's render method, define a variable to store the classes you want to add. For example:

const activeClass = this.state.focused === index ? 'active' : '';

This variable conditionally sets the 'active' class based on the state of the component.

Step 2: Use Template Literals to Combine Classes

Template literals allow you to use backticks (`) to create multi-line strings. Within the string, embed class variables using the ${} syntax.

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

This line concatenates the 'activeClass', 'data.class', and 'main-class' variables into a single string.

Step 3: Assign to className Attribute

In the JSX element, assign the 'classes' variable to the 'className' attribute. This will apply all the classes to the element.

<li key={index} className={classes}>...</li>

One-Liner Solution

You can combine these steps into a single line using the one-liner version:

const classes = `form-control round-lg ${this.state.valid ? '' : 'error'}`;

where 'this.state.valid' is a state variable that conditionally adds the 'error' class.

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