change value of params when calling function angular-CodePudding

I need to change the value of params for pageNumber and titulo when i call one of the functions below... but when i call the functions these params remains the same, example

http://miurl.com/jsonapi/views/busqueda_avanzada/informes?page=${this.pageNumber}&views-filter[titulo]=${this.titulo}; //pageNumber returns 0 which is the initial value, but when i call getPage() function still returns 0 when it should return 1 and then 2, for each call. The idea is to create a search filter with Angular. Hope you can give me some clue of what im doing wrong! Thanks

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';

export interface InformesCounter {
  data: any;
  meta: any;
  count: any;
  attributes: any;
  links: any;
  next: any;
  href: any;
  titulo: any;
}

@Injectable({
  providedIn: 'root'
})

export class BuscadorService {
  pageNumber: any = 0;
  titulo: any = '';
  informesNodes =`http://miurl.com/jsonapi/views/busqueda_avanzada/informes?page=${this.pageNumber}&views-filter[titulo]=${this.titulo}`;

  constructor(private http: HttpClient) { }
  
  getNodes(): Observable<InformesCounter> {
    this.pageNumber = 1;
    return this.http.get<InformesCounter>(`${this.informesNodes}`);
  }

  getFiltered(titulo: any): Observable<InformesCounter> {
    this.titulo = titulo;
    this.pageNumber = 1;
    return this.http.get<InformesCounter>(`${this.informesNodes}`);
  }

  getPage(): Observable<InformesCounter> {
    this.pageNumber = this.pageNumber   1;
    return this.http.get<InformesCounter>(`${this.informesNodes}`);
  }

  ungetPage(): Observable<InformesCounter> {
    this.pageNumber = this.pageNumber - 1;
    return this.http.get<InformesCounter>(`${this.informesNodes}`);
  }

}

CodePudding user response：

Your informesNodes template string only gets evaluated once, when the class instance is created. It is not automatically updated with new information.

An easy solution would be to replace it with a getter and the rest of your code can stay as-is:

get informesNodes() {
    return `http://miurl.com/jsonapi/views/busqueda_avanzada/informes?page=${this.pageNumber}&views-filter[titulo]=${this.titulo}`;
}