Issue with Angular: Unable to properly sort data while modifying queryParams

Within the component.ts file:

export class TabsComponent implements OnInit {
  constructor(
    private store$: Store<UsersState>,
    private router: ActivatedRoute
  ) {}

  ngOnInit(): void {
    this.onFilterByIncome();
    this.router.queryParams.subscribe((params) => {
      const param = params['tab'];
      console.log(param);

      if (param === 0) {
        this.onFilterByIncome(); //dispatch methods
      }
      if (param === 1) {
        this.onFilterByOutcome();
      }
      if (param === 2) {
        this.onFilterByLoan();
      }
      if (param === 3) {
        this.onFilterByInvestment();
      }
    });
  }

//As shown here
  onFilterByIncome() {
    this.store$.dispatch(new UsersFilterByIncomeAction());
  }

The component should update its data based on changes in the query parameters.

I have attempted various solutions, but none have been successful so far. The current code is not functioning as expected.

Answer №1

The problem lies in performing a strict equality comparison (using triple equals ===) between a string query parameter value and a number. The route query parameter value will always be a string because a URL is inherently a string.

const param: string = params['tab'];  <-- returns a string type, for example '0'.

if (param === 0) {. <-- even if the parameter is '0', the strict equality check will fail.
  this.onFilterByIncome();
}

To remedy this issue, you should adjust your comparison value to also be a string type. (This is the recommended solution)

if (param === '0') {
  this.onFilterByIncome();
}

Alternatively, you can use a loose equality comparison by utilizing double equals. ==

if (param == 0) {
  this.onFilterByIncome();
}

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