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import {
ChangeDetectionStrategy,
Component,
effect,
inject,
signal,
untracked,
} from '@angular/core'
import {
QueryClient,
injectQuery,
keepPreviousData,
} from '@tanstack/angular-query-experimental'
import { lastValueFrom } from 'rxjs'
import { ProjectsService } from '../services/projects.service'
@Component({
changeDetection: ChangeDetectionStrategy.OnPush,
selector: 'example',
templateUrl: './example.component.html',
})
export class ExampleComponent {
readonly queryClient = inject(QueryClient)
readonly projectsService = inject(ProjectsService)
readonly page = signal(0)
readonly query = injectQuery(() => ({
queryKey: ['projects', this.page()],
queryFn: () => {
return lastValueFrom(this.projectsService.getProjects(this.page()))
},
placeholderData: keepPreviousData,
staleTime: 5000,
}))
readonly prefetchEffect = effect(() => {
const data = this.query.data()
const isPlaceholderData = this.query.isPlaceholderData()
const newPage = this.page() + 1
untracked(() => {
if (!isPlaceholderData && data?.hasMore) {
void this.queryClient.prefetchQuery({
queryKey: ['projects', newPage],
queryFn: () =>
lastValueFrom(this.projectsService.getProjects(newPage)),
})
}
})
})
previousPage() {
this.page.update((currentPage) => {
return Math.max(currentPage - 1, 0)
})
}
nextPage() {
this.page.update((currentPage) => {
return this.query.data()?.hasMore ? currentPage + 1 : currentPage
})
}
}
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