How to Conditionally Apply Class Attributes in React Components?

Conditionally Applying Class Attributes in React

In React, it is often necessary to conditionally show or hide elements based on values passed from parent components. This can be achieved by manipulating the class attributes of the child component.

Example:

<TopicNav showBulkActions={this.__hasMultipleSelected} />

__hasMultipleSelected: function() {
  return false; //return true or false depending on data
}

var TopicNav = React.createClass({
  render: function() {
    return (
        <div className="row">
            <div className="col-lg-6">
                <div className={"btn-group pull-right " + (this.props.showBulkActions ? 'show' : 'hidden')}>
                    <button type="button" className="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
                      Bulk Actions <span className="caret"></span>
                    </button>
                    <ul className="dropdown-menu" role="menu">
                      <li><a href="#">Merge into New Session</a></li>
                      <li><a href="#">Add to Existing Session</a></li>
                      <li className="divider"></li>
                      <li><a href="#">Delete</a></li>
                    </ul>
                </div>
            </div>
        </div>
        );
      }
    });

Explanation:

The key to conditionally applying class attributes in React is using the conditional (ternary) operator within the curly braces for the className property. In this example, if this.props.showBulkActions is true, the show class is applied, otherwise the hidden class is applied.

Note: Ensure that the curly braces are outside the string, as shown in the example above. Otherwise, the expression will be evaluated as a string and the desired class names will not be applied.

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