title: Analytics isExperimentalPackage: true

Set of unopinionated, lightweight React components for implementing analytics tracking with composable event contexts.

AnalyticsListener

To use Analytics please wrap your app with at least one AnalyticsListener, which allows you to provide a callback for tracking events.

For example:

// hypothetical analytics backend
import analyticsClient from './utils/analytics';

export function App({ Component, pageProps }) {
  // Here is where we handle events
  const handleAnalyticsEvent = (eventName, eventData) => {
    console.log(`Received event ${eventName}`);
    analyticsClient.sendEvent(eventName, eventData);
  };

  return (
    <AnalyticsListener onEvent={handleAnalyticsEvent}>
      <Layout>
        <Component {...pageProps} />
      </Layout>
    </AnalyticsListener>
  );
}

It's possible to nest and stack multiple listeners, which will be invoked independently whenever an event is fired, i.e.:

<AnalyticsListener onEvent={sendToLegacyBackend}>
  <AnalyticsListener onEvent={sendToNewBackend}>
    <Layout>
      <Component {...pageProps} />
    </Layout>
  </AnalyticsListener>
</AnalyticsListener>

Props

AnalyticsContext

AnalyticsContext allows transient, universal analytics properties that will be automatically appended to all fired events. This is useful to reduce duplication and automatically include global properties such as configuration or environment.

<AnalyticsListener onEvent={sendToAnalyticsBackend}>
  <AnalyticsContext data={{ browser: navigator, isLoggedIn }}>
    <Layout>
      <Component {...pageProps} />
    </Layout>
  </AnalyticsContext>
</AnalyticsListener>

Context can be nested to append additional data inside the component structure.

<AnalyticsListener onEvent={sendToAnalyticsBackend}>
  <AnalyticsContext data={{ browser: navigator, isLoggedIn }}>
    <Header>
      <AnalyticsContext data={{ usingNavbar: 'main-navbar' }}>
        <Navbar id="main-navbar">
          <Button>Option 1</Button>
          <Button>Option 2</Button>
        </Navbar>
      </AnalyticsContext>
    </Header>
    <MainContent />
    <Footer>
      <AnalyticsContext data={{ usingNavbar: 'footer-navbar' }}>
        <Navbar id="footer-navbar">
          <Button>Option 1</Button>
          <Button>Option 2</Button>
        </Navbar>
      </AnalyticsContext>
    </Footer>
  </AnalyticsListener>
</AnalyticsListener>

useAnalytics hook

useAnalytics provides a function to fire events from custom components.

Example usage:

function ExpandingContainer({ children, id }) {
  const { expanded, setExpanded } = useState(false);
  const { trackEvent } = useAnalytics();

  const onClick = useCallback(() => {
    setExpanded(previousState => {
      const nextState = !previousState;
      const eventName = nextState
        ? 'container-expanded'
        : 'container-collapsed';

      trackEvent(eventName, { containerId: id });

      return nextState;
    });
  }, [id]);

  return (
    <>
      <button onClick={onClick}>
        {expanded ? 'Collapse' : 'Expand'} container
      </button>
      <Container>{expanded ? children : null}</Container>
    </>
  );
}