How to Conditionally Apply Class Attributes in React: Why is my button group visibility toggle not working?

Applying Class Attributes Conditionally in React

Conceptually, rendering elements conditionally is a common use case in React. However, the question arises when considering class attributes. This article explores how to conditionally apply class attributes, using a practical example:

Question:

A user is attempting to toggle the visibility of a button group based on a boolean value passed from a parent component. However, the class attribute is not being evaluated correctly.

<code class="jsx"><div className={"btn-group pull-right " + (this.props.showBulkActions ? 'show' : 'hidden')}></code>

Answer:

The issue lies with the placement of the curly braces surrounding the expression. Instead of being inside the string, they should be outside, along with the parentheses, as follows:

<code class="jsx"><div className={"btn-group pull-right " + (this.props.showBulkActions ? 'show' : 'hidden')}></code>

By placing the curly braces outside the string, the expression is evaluated as JavaScript code rather than a static string. This allows the correct class to be applied based on the boolean value of this.props.showBulkActions.

Additionally, a space is added after "pull-right" to ensure the class attribute is properly applied. Without the space, the risk of creating an invalid class, such as "pull-rightshow" instead of "pull-right show," is present.

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