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import { Component, OnInit } from "@angular/core";
import { Router } from "@angular/router";

import { debounceTime, distinctUntilChanged, switchMap } from "rxjs/operators";
import { Observable, Subject, of } from "rxjs";

import { PokemonsService } from "./pokemons.service";
import { Pokemon } from "./pokemon";

@Component({
  selector: "pokemon-search",
  templateUrl: "./app/pokemons/search-pokemon.component.html",
})
export class PokemonSearchComponent implements OnInit {
  private searchTerms = new Subject<string>();
  pokemons$: Observable<Pokemon[]>;

  constructor(
    private pokemonsService: PokemonsService,
    private router: Router
  ) {}

  // Ajoute un terme de recherche dans le flux de l'Observable 'searchTerms'
  search(term: string): void {
    this.searchTerms.next(term);
  }

  ngOnInit(): void {
    this.pokemons$ = this.searchTerms.pipe(
      // attendre 300ms de pause entre chaque requête
      debounceTime(300),
      // ignorer la recherche en cours si c'est la même que la précédente
      distinctUntilChanged(),
      // on retourne la liste des résultats correpsondant aux termes de la recherche
      switchMap((term: string) => this.pokemonsService.searchPokemons(term))
    );
  }

  gotoDetail(pokemon: Pokemon): void {
    let link = ["/pokemon", pokemon.id];
    this.router.navigate(link);
  }
}

<div class="row">
  <div class="col s12 m6 offset-m3">
    <div class="card">
      <div class="card-content">
        <div class="input-field">
          <input #searchBox (keyup)="search(searchBox.value)"
            placeholder="Rechercher un pokémon"/>
        </div>

        <div class="collection">
          <a *ngFor="let pokemon of pokemons$ | async"
            (click)="gotoDetail(pokemon)" class="collection-item">
            {{ pokemon.name }}
          </a>
        </div>
      </div>
    </div>
  </div>
</div>

import { Component } from '@angular/core';

@Component({
  selector: 'pkmn-loader',
  template: `
    <div class="preloader-wrapper big active">
      <div class="spinner-layer spinner-blue">
        <div class="circle-clipper left">
          <div class="circle"></div>
        </div><div class="gap-patch">
          <div class="circle"></div>
        </div><div class="circle-clipper right">
          <div class="circle"></div>
        </div>
      </div>
    </div>
  `
})
export class LoaderComponent {}