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React - Handle events

This section looks at how to handle events that are emitted by web components in a React application. It's important to note that handling events from web components in React is similar to handling native React events.


The foundation of our application is a standard React project.

  1. Initialise the using the following command:
npx create-react-app alpha-handle-events
  1. Install the Genesis Foundation packages: run this command from your project folder:
npm install --save @genesislcap/alpha-design-system
  1. Integrate the flyout web component.

This component is designed to display an additional sliding layer on the page. It accepts a property named closed. When this property is set to false, the layer becomes visible; when the close button is clicked, the component emits a closed event.

To register the <alpha-flyout> component, open your src/index.js file and add the following code:

import CodeBlock from '@theme/CodeBlock'; import Example from '!!raw-loader!/examples/ui/alphaFlyoutImports';


Preparing the React component

Now prepare a React component that will interact with the flyout web component. The React component must maintain a boolean state, responsible for controlling the display of the flyout. This boolean must be bound to the closed property of the flyout component.

Your component file /src/App.js should look like this:

import React, { useRef } from 'react';
import './App.css';

function App() {
const flyoutRef = useRef(null);

const showFlyout = () => {
flyoutRef.current.closed = false;

const hideFlyout = () => {
flyoutRef.current.closed = true;

return (
<div className="content">
<button onClick={showFlyout}>Show Flyout</button>
Flyout content

export default App;

The component contains the following properties and methods:

  • showFlyout()is a method that sets the closed parameter to false on the web component by reference flyoutRef. When this method is invoked, the flyout becomes visible.

  • hideFlyout() is a method that sets the displayFlyout state to false. When this method is called, it hides the flyout. This method is invoked when alpha-flayout emits a closed event.

These methods provide a simple interface for showing and hiding the flyout, effectively controlling the component's visibility based on user interactions.

The component's CSS (/src/App.css) should look like this:

.content {
background: #222;
color: #FFFFFF;
height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;

button {
padding: 10px;
border-radius: 10px;
margin: 10px;

alpha-flyout {
top: 0;
left: 0;
width: 100%;
height: 100%;
position: absolute;

alpha-flyout::part(flyout) {
width: 40%;
min-width: 320px;
padding: 0;

alpha-flyout::part(content) {
height: 100%;

Running the app

Now let's run our app in dev mode with:

npm start


🎉 Congratulations on successfully integrating and handling events with a web component from Foundation UI in your React application! 🎉

React flyout demo

repository with working code from the example