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Service to add Facebook Pixel event track to Angular application
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import { Injectable, OnDestroy } from '@angular/core'; | |
import { NavigationEnd, Router } from '@angular/router'; | |
import { Subscription } from 'rxjs'; | |
import { environment } from '@env/environment'; | |
declare let fbq: Function; | |
@Injectable({ | |
providedIn: 'root' | |
}) | |
export class FacebookPixelService implements OnDestroy { | |
/** | |
* Router event subscription | |
* @private | |
*/ | |
private _routerEventSubscription: Subscription; | |
/** | |
* Inject dependencies | |
* @param router: Router | |
*/ | |
constructor(private router: Router) { | |
} | |
/** | |
* Remove subscriptions | |
*/ | |
public ngOnDestroy(): void { | |
if (this._routerEventSubscription) { | |
this._routerEventSubscription.unsubscribe(); | |
} | |
} | |
/** | |
* Add script to DOM | |
*/ | |
public init(): void { | |
if (environment.facebook_pixel_id) { | |
const head = document.getElementsByTagName('head')[0]; | |
const script: HTMLScriptElement = document.createElement('script'); | |
script.innerHTML = `!function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?n.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';n.queue=[];t=b.createElement(e);t.async=!0;t.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window, document,'script','https://connect.facebook.net/en_US/fbevents.js');fbq('init','${environment.facebook_pixel_id}');`; | |
head.appendChild(script); | |
this._subscribeRouterEvents(); | |
} | |
} | |
/** | |
* Track custom events | |
* @param ev: string | |
*/ | |
public track(ev: string): void { | |
fbq('trackCustom', ev); | |
} | |
/** | |
* Track events | |
* @private | |
*/ | |
private _subscribeRouterEvents(): void { | |
this._routerEventSubscription = this.router.events.subscribe((ev: NavigationEnd) => { | |
if (ev instanceof NavigationEnd) { | |
fbq('track', 'PageView'); | |
this.track(ev.urlAfterRedirects); | |
} | |
}); | |
} | |
} | |
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