The detection of my query parameters is not working as expected

Creating an Angular application that dynamically loads a different login page based on the "groupId" set in the URL is my current challenge. The approach involves sending each client a unique URL containing a specific "groupId" parameter. A template is then utilized to fetch text and images from the firebase repository using this particular company's groupId.

I initially attempted to use query parameters in the following manner:

(Within my component):

  ngOnInit() {
    console.log('test');

    console.log(this.activeRoute.queryParams);
     this.activeRoute.queryParams
    .subscribe(params => {
      this.groupId = params.groupId;
   })
   console.log(this.groupId);
   if (this.groupId === undefined) {
    this.router.navigate(['/login/locked']);
   }
  }

(and the routes within the parent component)

const routes: Routes = [
  {
    path: 'login',
    component: LoginComponent,
    children: [
      {
        path: '', component: SignInComponent,
      },
      {
        path: 'signup', component: SignUpComponent,
      },
      {
        path: 'locked', component: LockScreenComponent,
      },
      {
        path: 'password-rest', component: PasswordResetComponent,
      }
    ]
  }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class AuthPagesRoutingModule { }

Despite implementing this, I continue to receive an "undefined" result when checking this.groupId after entering

www.example.com/login?groupId=FACEBOOK235
into the address bar (which leads me to the locked screen). Is there a crucial element I am overlooking?

Answer №1

since your if statement is located outside the subscribe function, the code may not execute as expected due to the asynchronous nature of the queryParams observable. To resolve this, consider the following revised code:

ngOnInit() {
    console.log('test');

    console.log(this.activeRoute.queryParams);
     this.activeRoute.queryParams
    .subscribe(params => {
      this.groupId = params.groupId;
      console.log(this.groupId);
      if (this.groupId === undefined) {
       this.router.navigate(['/login/locked']);
      }
   })
  }

(UPDATE) Printing out the complete parameter list yields:

closed: false
destination: BehaviorSubject {_isScalar: false, observers: Array(0), closed: false, isStopped: false, hasError: false, …}
hasError: false
isStopped: false
observers: []
operator: MapOperator {thisArg: undefined, project: ƒ}
source: BehaviorSubject {_isScalar: false, observers: Array(0), closed: false, isStopped: false, hasError: false, …}
thrownError: null
_isScalar: false
[[Prototype]]: Subject
complete: ƒ complete()
constructor: class AnonymousSubject
error: ƒ error(err)
next: ƒ next(value)
_subscribe: ƒ _subscribe(subscriber)
[[Prototype]]: Observable
asObservable: ƒ asObservable()
complete: ƒ complete()
constructor: class Subject
error: ƒ error(err)
lift: ƒ lift(operator)
next: ƒ next(value)
unsubscribe: ƒ unsubscribe()
_subscribe: ƒ _subscribe(subscriber)
_trySubscribe: ƒ _trySubscribe(subscriber)
Symbol(rxSubscriber): ƒ [_internal_symbol_rxSubscriber__WEBPACK_IMPORTED_MODULE_2__.rxSubscriber]()
[[Prototype]]: Object

Answer №2

When working with asynchronous observables, it's important to be mindful of where you access your properties. One common mistake is placing if conditions outside the subscribe method, which can lead to undefined values being retrieved. To avoid this issue, make sure to access necessary properties within the subscribe method itself.

ngOnInit() {
     this.activeRoute.queryParams
    .subscribe(params => {
      this.groupId = params.groupId;
      console.log(this.groupId);
      if (this.groupId === undefined) {
         this.router.navigate(['/login/locked']);
      }

   })   
  }

Answer №3

When using

this.activeRoute.queryParams.subscribe
, keep in mind that it is asynchronous. This can lead to console.log reporting undefined. To address this, make sure to add a check inside the subscribe function, like this:

this.activeRoute.queryParams
  .subscribe(params => {
    this.groupId = params.groupId;
    console.log(this.groupId);
    if (this.groupId === undefined) {
      this.router.navigate(['/login/locked']);
    }
})

Additionally, consider implementing Guards for extra security measures. You can learn more about Guards by visiting: https://angular.io/guide/router-tutorial-toh#milestone-5-route-guards. By utilizing a CanActivate guard that returns true or a URL tree, you can achieve the desired functionality.

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