fix(docs): Don't track fragment navigation as pageview

Author: Airblader

projects/ngqp-demo/src/app/shared/analytics.service.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
 import { NavigationEnd, Router } from '@angular/router';
-import { filter, map } from 'rxjs/operators';
+import { distinctUntilChanged, filter, map } from 'rxjs/operators';
 
 declare const gtag: Function;
 
@@ -21,9 +21,9 @@ export class AnalyticsService {
         router.events.pipe(
             filter(event => event instanceof NavigationEnd),
             map(event => event as NavigationEnd),
-        ).subscribe(event => {
-            const url = event.urlAfterRedirects;
-
+            map(event => event.urlAfterRedirects),
+            distinctUntilChanged(),
+        ).subscribe(url => {
             try {
                 gtag('config', 'UA-131508204-1', { 'page_path': url });
             } catch (ignored) {