Created
January 21, 2023 22:37
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import { Component, OnDestroy, OnInit } from '@angular/core'; | |
import { FormControl } from '@angular/forms'; | |
import { debounceTime, Subject, takeUntil } from 'rxjs'; | |
import { FoodService } from './food.service'; | |
@Component({ | |
selector: 'app-root', | |
templateUrl: './app.component.html', | |
styleUrls: ['./app.component.scss'], | |
}) | |
export class AppComponent implements OnInit, OnDestroy { | |
destroy$ = new Subject<void>(); | |
search = new FormControl(''); | |
foods$ = new Subject<Object>(); // nie przypisujemy danych bezpośrednio, tylko robimy subject typu Food | |
loading$ = new Subject<boolean>(); | |
constructor(private foodService: FoodService) {} | |
ngOnInit(): void { | |
this.getData(); // pobieramy dane inicjalnie | |
// można wydzielić to do metody listenForSearchValueChanges... | |
this.search.valueChanges // śledzenie wartości formularza | |
.pipe( | |
takeUntil(this.destroy$), // nasłuchiwanie tylko do momentu destroy komponentu, zapobiega wyciekowi danych | |
debounceTime(200) // gdy przerwa trwa 200 ms to dopiero wtedy strzał | |
) | |
.subscribe((formValue) => { | |
this.getData(formValue); // pobieramy dane na kazdej zmianie | |
}); | |
} | |
private getData(searchBy?: string) { | |
this.loading$.next(true); // włączamy loaderek bo jest szukanie | |
this.foodService.searchFoods(searchBy).subscribe({ // pobierz dane z backu | |
next: (data) => { | |
this.foods$.next(data); // update danych nową wartością z backendu | |
}, | |
complete: () => { | |
this.loading$.next(false); // niezalenie czy sukces czy błąd, wyłączamy loaderek | |
}, | |
}); | |
} | |
ngOnDestroy(): void { | |
this.destroy$.next(); | |
this.destroy$.unsubscribe(); | |
} | |
} |
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<div> | |
<input [formControl]="search" /> | |
</div> | |
{{ foods$ | async | json }} | |
<div *ngIf="loading$ | async">Loading</div> |
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import { HttpClient, HttpParams } from '@angular/common/http'; | |
import { Injectable } from '@angular/core'; | |
@Injectable({ | |
providedIn: 'root', | |
}) | |
export class FoodService { | |
readonly apiURL = 'http://localhost:8080/api/'; | |
constructor(private httpClient: HttpClient) {} | |
searchFoods(searchBy?: string) { | |
let params; | |
if (searchBy) { | |
// tworzymy paramsy | |
params = new HttpParams({ fromString: `name=${searchBy}` }); | |
} | |
// strzał z paramsami albo bez | |
return this.httpClient.get(`${this.apiURL}/foods`, { params: params }); | |
} | |
} |
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