Angular 4+ using Google Analytics

First of all, you need to install typings for Google Analytics in your devDependencies

npm install --save-dev @types/google.analytics

Then add your tracking code in the base index.html, and remove the last line as shown bellow:

<body>
  <app-root>Loading...</app-root>
  <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-XXXXXX-ID', 'auto');  // <- add the UA-ID 
                                           // <- remove the last line 
  </script>
</body>

The next step consists to update your home component constructor for event tracking. 

constructor(public router: Router) {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        ga('set', 'page', event.urlAfterRedirects);
        ga('send', 'pageview');
      }
    });
  }

If you want to track some specific event, you can also create a service and inject it into any component that you want to implement event tracking. 

// ./src/app/services/google-analytics-events-service.ts

import {Injectable} from "@angular/core";

@Injectable()
export class GoogleAnalyticsEventsService {

  public emitEvent(eventCategory: string,
                   eventAction: string,
                   eventLabel: string = null,
                   eventValue: number = null) {
    ga('send', 'event', { eventCategory, eventLabel, eventAction, eventValue });
  }
}

So if you want track a click on your home component for example, all you need to do is to inject the GoogleAnalyticsEventsService and call the emitEvent() method.

The updated home component source code:

constructor(public router: Router, public googleAnalyticsEventsService: GoogleAnalyticsEventsService) {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        ga('set', 'page', event.urlAfterRedirects);
        ga('send', 'pageview');
      }
    });
  }
  submitEvent() { // event fired from home.component.html element (button, link, ... )
    this.googleAnalyticsEventsService.emitEvent("testCategory", "testAction", "testLabel", 10);
  }

I'm surprised nobody here mentioned Google's Tag Manager yet (which is the version of the script that the Google Analytics console outputs for me in the last few years, whenever I add a new identity).

Here's a solution that I came up with today, which is a variation of the solutions already mentioned in the other answers, adapter to Google's Tag Manager script. I think it would be useful for people who migrated from ga() to gtag() (a migration that is recommended as far as I know).

analytics.service.ts

declare var gtag: Function;

@Injectable({
  providedIn: 'root'
})
export class AnalyticsService {

  constructor(private router: Router) {

  }

  public event(eventName: string, params: {}) {
    gtag('event', eventName, params);
  }

  public init() {
    this.listenForRouteChanges();

    try {

      const script1 = document.createElement('script');
      script1.async = true;
      script1.src = 'https://www.googletagmanager.com/gtag/js?id=' + environment.googleAnalyticsKey;
      document.head.appendChild(script1);

      const script2 = document.createElement('script');
      script2.innerHTML = `
        window.dataLayer = window.dataLayer || [];
        function gtag(){dataLayer.push(arguments);}
        gtag('js', new Date());
        gtag('config', '` + environment.googleAnalyticsKey + `', {'send_page_view': false});
      `;
      document.head.appendChild(script2);
    } catch (ex) {
      console.error('Error appending google analytics');
      console.error(ex);
    }
  }

  private listenForRouteChanges() {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        gtag('config', environment.googleAnalyticsKey, {
          'page_path': event.urlAfterRedirects,
        });
        console.log('Sending Google Analytics hit for route', event.urlAfterRedirects);
        console.log('Property ID', environment.googleAnalyticsKey);
      }
    });
  }
}

Prerequisites:

  • Declare the service in the imports[] section of your app.module.ts.
  • In your app.component.ts (or whichever higher level component holds the <router-outlet> tag in its template), inject the AnalyticsService and call this.analytics.init() as early as possible (e.g. ngOnInit)
  • In the environment.ts (in my case - environment.prod.ts), add the Analytics ID as googleAnalyticsKey: 'UA-XXXXXXX-XXXX'

Tags:

Google Analytics

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