66 lines
2.4 KiB
TypeScript
66 lines
2.4 KiB
TypeScript
/** Angular Imports */
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import { CollectionViewer, DataSource } from '@angular/cdk/collections';
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/** rxjs Imports */
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import { Observable, BehaviorSubject } from 'rxjs';
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/** Custom Services */
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import { CentersService } from './centers.service';
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/**
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* Centers custom data source to implement server side filtering, pagination and sorting.
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*/
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export class CentersDataSource implements DataSource<any> {
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/** centers behavior subject to represent loaded centers page. */
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private centersSubject = new BehaviorSubject<any[]>([]);
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/** Records subject to represent total number of filtered centers records. */
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private recordsSubject = new BehaviorSubject<number>(0);
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/** Records observable which can be subscribed to get the value of total number of filtered centers records. */
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public records$ = this.recordsSubject.asObservable();
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/**
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* @param {CentersService} centersService Centers Service
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*/
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constructor(private centersService: CentersService) {}
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/**
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* Gets centers on the basis of provided parameters and emits the value.
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* @param {any} filterBy Properties by which entries should be filtered.
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* @param {string} orderBy Property by which entries should be sorted.
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* @param {string} sortOrder Sort order: ascending or descending.
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* @param {number} pageIndex Page number.
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* @param {number} limit Number of entries within the page.
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* @param {boolean} centerActive Specify whether to only filter active centers.
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*/
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getCenters(
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filterBy: any,
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orderBy: string = '',
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sortOrder: string = '',
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pageIndex: number = 0,
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limit: number = 10,
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centerActive: boolean = true
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) {
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this.centersSubject.next([]);
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this.centersService.getCenters(filterBy, orderBy, sortOrder, pageIndex * limit, limit).subscribe((centers: any) => {
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centers.pageItems = centerActive ? centers.pageItems.filter((center: any) => center.active) : centers.pageItems;
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this.recordsSubject.next(centers.totalFilteredRecords);
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this.centersSubject.next(centers.pageItems);
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});
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}
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/**
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* @param {CollectionViewer} collectionViewer
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*/
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connect(collectionViewer: CollectionViewer): Observable<any[]> {
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return this.centersSubject.asObservable();
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}
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/**
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* @param {CollectionViewer} collectionViewer
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*/
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disconnect(collectionViewer: CollectionViewer): void {
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this.centersSubject.complete();
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this.recordsSubject.complete();
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}
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}
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