Angular failing to retrieve URL parameters correctly

Question

Angular failing to retrieve URL parameters correctly

As I was trying to retrieve URL queries like www.website.com?a:b, I decided to follow the guidance provided in a particular Angular tutorial. This official tutorial (accessible via this link) instructed me to implement the following simple code snippet within my component:

constructor(private route: ActivatedRoute) {}

ngOnInit() {
  this.route.queryParams.subscribe(params => {
    console.log(params)
  })
}

Surprisingly, executing this code triggered an error message in the browser console:

ERROR NullInjectorError: R3InjectorError(AppModule)[ActivatedRoute -> ActivatedRoute -> ActivatedRoute]: NullInjectorError: No provider for ActivatedRoute!

Despite the absence of any mention about it in the tutorial, I proceeded to add ActivatedRoute to my app.module.ts. To my dismay, this modification led to yet another error:

Error: NG0204: Can't resolve all parameters for ActivatedRoute: (?, ?, ?, ?, ?, ?, ?, ?).

Curiously, it seems like no one else encountered this issue before. As I am puzzled by this problem, I wonder if anyone has insights into what might be causing it. Any help or suggestions would be greatly appreciated. Thank you.

angular typescript

Answer 1

Answer №1

It seems that in your app.module or main.module file, you might need to include an import statement. By referring to this resource located at the end of the page you provided, you can find the necessary information.

@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    // This particular code segment is responsible for enabling the ActivatedRoute service
    // The useHash parameter may not be required in your case, so it can be omitted
    RouterModule.forRoot(routes, { useHash: true })  // .../#/crisis-center/
  ],
  declarations: [
    AppComponent,
    PageNotFoundComponent
  ],
  providers: [

  ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

Answer 2

It seems that in your app.module or main.module file, you might need to include an import statement. By referring to this resource located at the end of the page you provided, you can find the necessary information.

@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    // This particular code segment is responsible for enabling the ActivatedRoute service
    // The useHash parameter may not be required in your case, so it can be omitted
    RouterModule.forRoot(routes, { useHash: true })  // .../#/crisis-center/
  ],
  declarations: [
    AppComponent,
    PageNotFoundComponent
  ],
  providers: [

  ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

Answer 3

Answer №2

It appears that the desired outcome you're aiming for can be achieved by implementing the code snippet below:

this.sub = this.activatedRoute.params.subscribe((params : Params) => {
    // You will now have access to all parameters stored in the 'params' variable
});

Answer 4

It appears that the desired outcome you're aiming for can be achieved by implementing the code snippet below:

this.sub = this.activatedRoute.params.subscribe((params : Params) => {
    // You will now have access to all parameters stored in the 'params' variable
});

Answer 5

Answer №3

That's why I like to utilize parameters directly within the route path.

app-routing.modules.ts

{ path: 'bible/:bookId/:chapterId/:verseIdStart/:verseIdEnd', component: BibleComponent },

bible.component.ts

  constructor(
    private route: ActivatedRoute,
  ) {
    const bookId: number = Number(this.route.snapshot.params.bookId) || 0;
    const chapterId: number = Number(this.route.snapshot.params.chapterId) || 0;
    const verseIdStart: number = Number(this.route.snapshot.params.verseIdStart) || 0;
    const verseIdEnd: number = Number(this.route.snapshot.params.verseIdEnd) || 0;
  }

Answer 6

That's why I like to utilize parameters directly within the route path.

app-routing.modules.ts

{ path: 'bible/:bookId/:chapterId/:verseIdStart/:verseIdEnd', component: BibleComponent },

bible.component.ts

  constructor(
    private route: ActivatedRoute,
  ) {
    const bookId: number = Number(this.route.snapshot.params.bookId) || 0;
    const chapterId: number = Number(this.route.snapshot.params.chapterId) || 0;
    const verseIdStart: number = Number(this.route.snapshot.params.verseIdStart) || 0;
    const verseIdEnd: number = Number(this.route.snapshot.params.verseIdEnd) || 0;
  }

Angular failing to retrieve URL parameters correctly

Answer №1

Answer №2

Answer №3

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