@10up/react-focus-trap-hoc

react-focus-trap-hoc 1.0.1

React focus trap is a higher order component intended to be used on components within a React application that may require focus to be driven to it, and then trapped within it until another action is taken by the user. A prime example of this would be a modal. From an accessibility standpoint, a user navigating a site with the keyboard may activate a modal, focus can be driven to the modal, and then remain inside the modal so the user can navigate through the content without focus being lost outside the modal.

Instalation

NPM

npm install @10up/react-focus-trap-hoc --save

Yarn

yarn add @10up/react-focus-trap-hoc --save

Usage

Let's use the following file as an example:

  // Modal.jsgs
  import React, { Component } from 'react';

  class Modal extends Component {
    constructor(props) {
      super(props);

      this.state = {
        isOpen: false,
      }
    }

    // Other methods here that handle the actual open and close function of the modal.

    render() {
      return(
        <div id="modal">
          <p>Super fancy content with <a href="#">focusable elements</a> within the modal!</p>
          <button>Just a button here</button>
        </div>
      );
    }
  }

  export default Modal;

To ensure that focus is retained within your component, simply add the following:

  // Modal.js
  import React, { Component } from 'react';
+ import trapHOC from 'react-focus-trap-hoc';

  class Modal extends Component {
    constructor(props) {
      super(props);

      this.state = {
        isOpen: false,
      }
    }

+   componentDidMount() {
+     if (this.state.searchOpen === true) {
+       this.props.activateTrap();
+      } else {
+       this.props.deactivateTrap();
+     }
+   }

    // Other methods here that handle the actual open and close function of the modal.

    render() {
      return(
        <div id="modal">
          <p>Super fancy content with <a href="#"></a>focusable elements</a> within the modal!</p>
          <button>Just a button here</button>
        </div>
      );
    }
  }

- export default Modal;
+ export default trapHoc()(Modal);

Documentation

trapHoc(options={ trapIsActive: false })(YourWrappedComponent);

React focus trap HOC allows you to pass options to the HOC itself. By default trapIsActive is set to false. This option dictates whether or not focus should be trapped initially. This would need to be set true for instance, when using react focus trap HOC with a stateless functional component.

React focus trap HOC also passes two functions to your wrapped component as props:

activateTrap()

activateTrap() changes the state on the HOC, telling it that the trap is active.

deactivateTrap()

deactivateTrap() changes the state on the HOC, telling it that the trap is inactive.

activateTrap() and deactivateTrap() must be triggered on your component when state is changed on your wrapped component.

Contribute

What to help or have a suggestion? Open a new ticket and we can discuss it or submit pull request. Thanks for your interest!

License

MIT