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Answer:30 #1455

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f54ba10
feat(Answer:30): refactor componen store to use signal store
phhien203 Mar 15, 2026
771d0b1
feat(Answer:30): make fetching resource a reuasble signal feature
phhien203 Mar 16, 2026
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143 changes: 51 additions & 92 deletions apps/signal/30-interop-rxjs-signal/src/app/list/photos.component.ts
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Original file line number Diff line number Diff line change
@@ -1,30 +1,21 @@
import { AsyncPipe } from '@angular/common';
import { Component, inject, OnInit } from '@angular/core';
import { FormControl, ReactiveFormsModule } from '@angular/forms';
import { Component, inject } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatProgressBarModule } from '@angular/material/progress-bar';
import { RouterLinkWithHref } from '@angular/router';
import { provideComponentStore } from '@ngrx/component-store';
import {
debounceTime,
distinctUntilChanged,
Observable,
skipWhile,
tap,
} from 'rxjs';

import { Photo } from '../photo.model';
import { PhotoStore } from './photos.store';
import { PhotosStore } from './photos.store';

@Component({
selector: 'app-photos',
imports: [
ReactiveFormsModule,
FormsModule,
MatFormFieldModule,
MatProgressBarModule,
MatInputModule,
RouterLinkWithHref,
AsyncPipe,
],
template: `
<h2 class="mb-2 text-xl">Photos</h2>
Expand All @@ -34,93 +25,61 @@ import { PhotoStore } from './photos.store';
<input
type="text"
matInput
[formControl]="search"
[ngModel]="store.search()"
(ngModelChange)="store.setSearch($event)"
placeholder="find a photo" />
</mat-form-field>

@let vm = vm$ | async;
<section class="flex flex-col">
<section class="flex items-center gap-3">
<button
[disabled]="vm.page === 1"
[class.bg-gray-400]="vm.page === 1"
class="rounded-md border p-3 text-xl"
(click)="store.previousPage()">
<
</button>
<button
[disabled]="vm.endOfPage"
[class.bg-gray-400]="vm.endOfPage"
class="rounded-md border p-3 text-xl"
(click)="store.nextPage()">
>
</button>
Page :{{ vm.page }} / {{ vm.pages }}
</section>
@if (vm.loading) {
<mat-progress-bar mode="query" class="mt-5"></mat-progress-bar>
}
@if (vm.photos && vm.photos.length > 0) {
<ul class="flex flex-wrap gap-4">
@for (
photo of vm.photos;
track photo.id;
let i = $index
) {
<li>
<a routerLink="detail" [queryParams]="{ photo: encode(photo) }">
<img
src="{{ photo.url_q }}"
alt="{{ photo.title }}"
class="image" />
</a>
</li>
}
</ul>
} @else {
<div>No Photos found. Type a search word.</div>
}
<footer class="text-red-500">
{{ vm.error }}
</footer>
<section class="flex flex-col">
<section class="flex items-center gap-3">
<button
[disabled]="store.page() === 1"
[class.bg-gray-400]="store.page() === 1"
class="rounded-md border p-3 text-xl"
(click)="store.previousPage()">
<
</button>
<button
[disabled]="store.endOfPage()"
[class.bg-gray-400]="store.endOfPage()"
class="rounded-md border p-3 text-xl"
(click)="store.nextPage()">
>
</button>
Page :{{ store.page() }} / {{ store.pages() }}
</section>
@if (store.loading()) {
<mat-progress-bar mode="query" class="mt-5"></mat-progress-bar>
}
@let photos = store.data();
@if (photos && photos.length > 0) {
<ul class="flex flex-wrap gap-4">
@for (photo of photos; track photo.id; let i = $index) {
<li>
<a routerLink="detail" [queryParams]="{ photo: encode(photo) }">
<img
src="{{ photo.url_q }}"
alt="{{ photo.title }}"
class="image" />
</a>
</li>
}
</ul>
} @else {
<div>No Photos found. Type a search word.</div>
}
<footer class="text-red-500">
{{ store.error() }}
</footer>
</section>
`,
providers: [provideComponentStore(PhotoStore)],
providers: [PhotosStore],
host: {
class: 'p-5 block',
},
})
export default class PhotosComponent implements OnInit {
store = inject(PhotoStore);
readonly vm$: Observable<{
photos: Photo[];
search: string;
page: number;
pages: number;
endOfPage: boolean;
loading: boolean;
error: unknown;
}> = this.store.vm$.pipe(
tap(({ search }) => {
if (!this.formInit) {
this.search.setValue(search);
this.formInit = true;
}
}),
);

private formInit = false;
search = new FormControl();

ngOnInit(): void {
this.store.search(
this.search.valueChanges.pipe(
skipWhile(() => !this.formInit),
debounceTime(300),
distinctUntilChanged(),
),
);
}
export default class PhotosComponent {
readonly store = inject(PhotosStore);

encode(photo: Photo) {
return encodeURIComponent(JSON.stringify(photo));
Expand Down
172 changes: 39 additions & 133 deletions apps/signal/30-interop-rxjs-signal/src/app/list/photos.store.ts
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Original file line number Diff line number Diff line change
@@ -1,135 +1,41 @@
import { inject, Injectable } from '@angular/core';
import {
ComponentStore,
OnStateInit,
OnStoreInit,
} from '@ngrx/component-store';
import { tapResponse } from '@ngrx/operators';
import { pipe } from 'rxjs';
import { filter, mergeMap, tap } from 'rxjs/operators';
import { Photo } from '../photo.model';
import { withStorageSync } from '@angular-architects/ngrx-toolkit';
import { inject } from '@angular/core';
import { signalStore, withComputed, withHooks } from '@ngrx/signals';
import { PhotoService } from '../photos.service';

const PHOTO_STATE_KEY = 'photo_search';

export interface PhotoState {
photos: Photo[];
search: string;
page: number;
pages: number;
loading: boolean;
error: unknown;
}

const initialState: PhotoState = {
photos: [],
search: '',
page: 1,
pages: 1,
loading: false,
error: '',
};

@Injectable()
export class PhotoStore
extends ComponentStore<PhotoState>
implements OnStoreInit, OnStateInit
{
private photoService = inject(PhotoService);

private readonly photos$ = this.select((s) => s.photos);
private readonly search$ = this.select((s) => s.search);
private readonly page$ = this.select((s) => s.page);
private readonly pages$ = this.select((s) => s.pages);
private readonly error$ = this.select((s) => s.error);
private readonly loading$ = this.select((s) => s.loading);

private readonly endOfPage$ = this.select(
this.page$,
this.pages$,
(page, pages) => page === pages,
);

readonly vm$ = this.select(
{
photos: this.photos$,
search: this.search$,
page: this.page$,
pages: this.pages$,
endOfPage: this.endOfPage$,
loading: this.loading$,
error: this.error$,
import { withRemoteResource } from '../store-feature/with-remote-resource.feature';
import { withRequestStatus } from '../store-feature/with-request-status.feature';
import { withSearchAndPaging } from '../store-feature/with-search-and-paging.feature';

export const PHOTO_STATE_KEY = 'photo_search';

export const PhotosStore = signalStore(
withRequestStatus(),
withSearchAndPaging(),
withStorageSync({
key: PHOTO_STATE_KEY,
autoSync: false,
select: ({ page, search }) => ({ page, search }),
}),
withRemoteResource({
syncToStorage: true,
loaderFnFactory: () => {
const service = inject(PhotoService);
return service.searchPublicPhotos.bind(service);
},
{ debounce: true },
);

ngrxOnStoreInit() {
const savedJSONState = localStorage.getItem(PHOTO_STATE_KEY);
if (savedJSONState === null) {
this.setState(initialState);
} else {
const savedState = JSON.parse(savedJSONState);
this.setState({
...initialState,
search: savedState.search,
page: savedState.page,
});
}
}

ngrxOnStateInit() {
this.searchPhotos(
this.select({
search: this.search$,
page: this.page$,
}),
);
}

readonly search = this.updater(
(state, search: string): PhotoState => ({
...state,
search,
page: 1,
}),
);

readonly nextPage = this.updater(
(state): PhotoState => ({
...state,
page: state.page + 1,
}),
);

readonly previousPage = this.updater(
(state): PhotoState => ({
...state,
page: state.page - 1,
}),
);

readonly searchPhotos = this.effect<{ search: string; page: number }>(
pipe(
filter(({ search }) => search.length >= 3),
tap(() => this.patchState({ loading: true, error: '' })),
mergeMap(({ search, page }) =>
this.photoService.searchPublicPhotos(search, page).pipe(
tapResponse(
({ photos: { photo, pages } }) => {
this.patchState({
loading: false,
photos: photo,
pages,
});
localStorage.setItem(
PHOTO_STATE_KEY,
JSON.stringify({ search, page }),
);
},
(error: unknown) => this.patchState({ error, loading: false }),
),
),
),
),
);
}
}),
withComputed(({ page, pages }) => ({
endOfPage: () => page() === pages(),
})),
withHooks((store) => {
return {
onInit() {
store.readFromStorage();

store.loadResource(() => ({
search: store.search(),
page: store.page(),
}));
},
};
}),
);
19 changes: 11 additions & 8 deletions apps/signal/30-interop-rxjs-signal/src/app/photos.service.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
import { HttpClient } from '@angular/common/http';
import { Injectable, inject } from '@angular/core';
import { Observable } from 'rxjs';
import { inject, Injectable } from '@angular/core';
import { map, Observable } from 'rxjs';
import { Photo } from './photo.model';

export interface FlickrAPIResponse {
Expand All @@ -21,10 +21,9 @@ export class PhotoService {
public searchPublicPhotos(
searchTerm: string,
page: number,
): Observable<FlickrAPIResponse> {
return this.http.get<FlickrAPIResponse>(
'https://www.flickr.com/services/rest/',
{
): Observable<{ data: Photo[]; pages: number }> {
return this.http
.get<FlickrAPIResponse>('https://www.flickr.com/services/rest/', {
params: {
tags: searchTerm,
method: 'flickr.photos.search',
Expand All @@ -37,7 +36,11 @@ export class PhotoService {
extras: 'tags,date_taken,owner_name,url_q,url_m',
api_key: 'c3050d39a5bb308d9921bef0e15c437d',
},
},
);
})
.pipe(
map(({ photos: { pages, photo } }) => {
return { pages, data: photo };
}),
);
}
}
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