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fix(angular-google-tag-manager.service): document not defined when using ssr #167

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fix(angular-google-tag-manager.service): document not defined when using ssr #167

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29 changes: 24 additions & 5 deletions projects/angular-google-tag-manager/src/lib/angular-google-tag-manager.service.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import { Inject, Injectable, Optional } from '@angular/core';
import { Inject, Injectable, Optional, PLATFORM_ID } from '@angular/core';
import { GoogleTagManagerConfiguration } from './angular-google-tag-manager-config.service';
import { GoogleTagManagerConfig } from './google-tag-manager-config';
import { isPlatformBrowser } from "@angular/common";

@Injectable({
providedIn: 'root',
Expand All @@ -11,10 +12,10 @@ export class GoogleTagManagerService {

private browserGlobals = {
windowRef(): any {
return window;
return null;
},
documentRef(): any {
return document;
return null;
},
};

Expand All @@ -34,8 +35,21 @@ export class GoogleTagManagerService {
public googleTagManagerResourcePath: string,
@Optional()
@Inject('googleTagManagerCSPNonce')
public googleTagManagerCSPNonce: string
public googleTagManagerCSPNonce: string,
@Inject(PLATFORM_ID)
private platformId: Object
) {
if (isPlatformBrowser(this.platformId)) {
this.browserGlobals = {
windowRef(): any {
return window;
},
documentRef(): any {
return document;
},
};
}

this.config = this.googleTagManagerConfiguration?.get();
if (this.config == null) {
this.config = { id: null };
Expand All @@ -55,7 +69,7 @@ export class GoogleTagManagerService {
}

public getDataLayer(): any[] {
const window = this.browserGlobals.windowRef();
const window = this.browserGlobals.windowRef() ?? {dataLayer: []};
window.dataLayer = window.dataLayer || [];
return window.dataLayer;
}
Expand All @@ -71,6 +85,11 @@ export class GoogleTagManagerService {
return resolve(this.isLoaded);
}
const doc = this.browserGlobals.documentRef();

if (doc === null) {
return resolve(true);
}

this.pushOnDataLayer({
'gtm.start': new Date().getTime(),
event: 'gtm.js',
Expand Down