typescript - Angular 4+ using Google Analytics

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typescript - Angular 4+ using Google Analytics

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

typescript - Angular 4+ using Google Analytics

I'm trying to use the Google Analytics with angular 4, but i can't find any @type to ga.js in ts.

For a quick solution I used this in every component:

declare let ga: any;

Following how I resolved it:

Create a function to load the GA dynamically that inserts the GA script with current trackingId and user.

    loadGA(userId) {
        if (!environment.GAtrackingId) return;

        let scriptId = 'google-analytics';

        if (document.getElementById(scriptId)) {
            return;
        }

        var s = document.createElement('script') as any;
        s.type = "text/javascript";
        s.id = scriptId;
        s.innerText = "(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','//www.google-analytics.com/analytics.js','ga');ga('create', { trackingId: '" + **environment.GAtrackingId** + "', cookieDomain: 'auto', userId: '" + **userId** + "'});ga('send', 'pageview', '/');";

        document.getElementsByTagName("head")[0].appendChild(s);
    }

Create the service to implement the methods that you will need.

import { Injectable } from '@angular/core';
import { environment } from '../../../environments/environment';

declare let ga: any;

@Injectable()
export class GAService {
    constructor() {
    }

    /**
     * Checks if the GA script was loaded.
     */
    private useGA() : boolean { 
        return environment.GAtrackingId && typeof ga !== undefined;
    }

    /**
     * Sends the page view to GA.
     * @param  {string} page The path portion of a URL. This value should start with a slash (/) character.
     */
    sendPageView(
        page: string
    ) {
        if (!this.useGA()) return;
        if (!page.startsWith('/')) page = `/${page}`;      
        ga('send', 'pageview', page);
    }


    /**
     * Sends the event to GA.
     * @param  {string} eventCategory Typically the object that was interacted with (e.g. 'Video')
     * @param  {string} eventAction The type of interaction (e.g. 'play')
     */
    sendEvent(
        eventCategory: string,
        eventAction: string
    ) { 
        if (!this.useGA()) return;
        ga('send', 'event', eventCategory, eventAction);
    }
}

Then I finally use the service injected in component.

constructor(private ga: GAService) {}

ngOnInit() { this.ga.sendPageView('/join'); }

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1 Reply

深蓝 · Answer 1 · 2021-10-17T00:11:56+0000

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);
  }

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typescript - Angular 4+ using Google Analytics

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