There are NPM packages for implementing various analytics providers in Angular 2 but for simpler requirements there isn’t always a reason to include Yet Another Dependency.

At it’s most basic implementation what we usually need to do is track pageviews. To do so we need to watch the Angular 2 router (or your router of choice) and trigger a Google Analytics event.

In your index.html include the Google Analytics script but remove ga('send', 'pageview' ... ):

<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-XXXXXXXX-XX', 'auto');
</script>

Next, in one of our application files (I would recommend the application root but not the application bootstrap file) we need to cachethe current route,add a router subscription and trigger an event if the route changes.

In app.component.ts:

import ...
declare var ga:Function;
export class AppComponent {
  currentRoute: string = '';
  constructor(router: Router) {
    router.subscribe((route) => {
      var newRoute = route || '/';
      if(newRoute !== this.currentRoute) {
        ga('send', 'pageview', newRoute);
        this.currentRoute = newRoute;
      }
    });
  }
}

The above is all pseudo code and needs modification for most use cases, but in general we need to:

  1. Include Google Analytics script in index.html but remove ga('send', 'pageview', ...);
  2. Add declare var ga:Function; to app.component.ts
  3. In app.component.ts cache a version of the previous route.
  4. In the constructor in app.component.ts add a router subscription and if the route changes, use ga('send', 'pageview', ...); to send the update to Google Analytics.