Cannot read property of undefined in APP_INITIALIZER - Angular

Question

I'm trying to execute my saveURL method with the APP_INITIALIZER, but I'm getting and error in my saveURL method.

ERROR TypeError: Cannot read property 'setCookie' of undefined

App.modulte.ts

 ...
   export function saveUrl(dualLogonService: DualLogonService) {
     console.debug('Executing saveUrl');
      return (): Promise<any> => {
        dualLogonService.setCookie(); //THIS IS WHAT GIVES ME ERROR
        return null;
      };
    }
   ...
    providers: [
    ...
          {
              provide: APP_INITIALIZER,
              useFactory: saveUrl,
              deps: [DualLogonService],
              multi: true
          }
    ]

DualLogonService.ts

import { Injectable } from '@angular/core';
import { Router, CanActivate } from '@angular/router';
import { AuthenticationService } from '@sec/security';
import { appConfigMapping } from 'src/environments/app.config.mapping';
import { of } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DualLogonService implements CanActivate {
...
  constructor(
    private router: Router,
    private authService: AuthenticationService
  ) {}
..

  setCookie(): void {
    document.cookie = 'Deeplink' + '=' + this.router.url + ';path=/';
  }

dotnet-provoke · Accepted Answer · 2019-06-19 21:36:29Z

1

Add DualLogonService to the Providers-array

answered Jun 19, 2019 at 21:36

dotnet-provoke

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4 Comments

Patricio Vargas Over a year ago

I tried that before and I got this error: Uncaught Error: Provider parse errors: Cannot instantiate cyclic dependency! ApplicationRef ("[ERROR ->]"): in NgModule

dotnet-provoke Over a year ago

Evidently you are injecting other services (which are not shown in the code you posted) that have dependencies (http or other services is the same). Try to follow some tutorials to understand how it works, like this: intertech.com/Blog/…

Patricio Vargas Over a year ago

I have updated my questions with more code. So what I understood is that I have to add the other services I'm injecting in the constructor to the providers in the app.module.ts?

dotnet-provoke Over a year ago

I would abstract away everything from the duallogonservice to a InitAppService having only the setcookie method in that service and you should be good to go!

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