Added pagination to community's collection list in the community page

src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.html

@@ -1,14 +1,13 @@
 <ng-container *ngVar="(subCollectionsRDObs | async) as subCollectionsRD">
   <div *ngIf="subCollectionsRD?.hasSucceeded && subCollectionsRD?.payload.totalElements > 0" @fadeIn>
     <h2>{{'community.sub-collection-list.head' | translate}}</h2>
-    <ul>
-      <li *ngFor="let collection of subCollectionsRD?.payload.page">
-        <p>
-          <span class="lead"><a [routerLink]="['/collections', collection.id]">{{collection.name}}</a></span><br>
-          <span class="text-muted">{{collection.shortDescription}}</span>
-        </p>
-      </li>
-    </ul>
+    <ds-viewable-collection
+      [config]="config"
+      [sortConfig]="sortConfig"
+      [objects]="subCollectionsRD"
+      [hideGear]="false"
+      (paginationChange)="onPaginationChange($event)">
+    </ds-viewable-collection>
   </div>
   <ds-error *ngIf="subCollectionsRD?.hasFailed" message="{{'error.sub-collections' | translate}}"></ds-error>
   <ds-loading *ngIf="subCollectionsRD?.isLoading" message="{{'loading.sub-collections' | translate}}"></ds-loading>

src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.spec.ts

@@ -0,0 +1,169 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { By } from '@angular/platform-browser';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+
+import { CommunityPageSubCollectionListComponent } from './community-page-sub-collection-list.component';
+import { Community } from '../../core/shared/community.model';
+import { SharedModule } from '../../shared/shared.module';
+import { CollectionDataService } from '../../core/data/collection-data.service';
+import { FindListOptions } from '../../core/data/request.models';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+
+describe('CommunityPageSubCollectionListComponent Component', () => {
+  let comp: CommunityPageSubCollectionListComponent;
+  let fixture: ComponentFixture<CommunityPageSubCollectionListComponent>;
+  let collectionDataServiceStub: any;
+  let subCollList = [];
+
+  const collections = [Object.assign(new Community(), {
+    id: '123456789-1',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'Collection 1' }
+      ]
+    }
+  }),
+    Object.assign(new Community(), {
+      id: '123456789-2',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 2' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-4',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 7' }
+        ]
+      }
+    })
+  ];
+
+  const mockCommunity = Object.assign(new Community(), {
+    id: '123456789',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'Test title' }
+      ]
+    }
+  });
+
+  collectionDataServiceStub = {
+    findByParent(parentUUID: string, options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > subCollList.length) {
+        endPageIndex = subCollList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subCollList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [TranslateModule.forRoot(), SharedModule,
+        RouterTestingModule.withRoutes([]),
+        NoopAnimationsModule],
+      declarations: [CommunityPageSubCollectionListComponent],
+      providers: [
+        { provide: CollectionDataService, useValue: collectionDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(CommunityPageSubCollectionListComponent);
+    comp = fixture.componentInstance;
+    comp.community = mockCommunity;
+  });
+
+  it('should display a list of collections', () => {
+    subCollList = collections;
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(5);
+    expect(collList[0].nativeElement.textContent).toContain('Collection 1');
+    expect(collList[1].nativeElement.textContent).toContain('Collection 2');
+    expect(collList[2].nativeElement.textContent).toContain('Collection 3');
+    expect(collList[3].nativeElement.textContent).toContain('Collection 4');
+    expect(collList[4].nativeElement.textContent).toContain('Collection 5');
+  });
+
+  it('should not display the header when collection list is empty', () => {
+    subCollList = [];
+    fixture.detectChanges();
+
+    const subComHead = fixture.debugElement.queryAll(By.css('h2'));
+    expect(subComHead.length).toEqual(0);
+  });
+
+  it('should update list of collection on pagination change', () => {
+    subCollList = collections;
+    fixture.detectChanges();
+
+    const pagination = Object.create({});
+    pagination.pageId = comp.pageId;
+    pagination.page = 2;
+    pagination.pageSize = 5;
+    pagination.sortField = 'dc.title';
+    pagination.sortDirection = 'ASC';
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('Collection 6');
+    expect(collList[1].nativeElement.textContent).toContain('Collection 7');
+  });
+});

src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.ts

@@ -1,12 +1,16 @@
 import { Component, Input, OnInit } from '@angular/core';
-import { Observable } from 'rxjs';
+
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
 
 import { RemoteData } from '../../core/data/remote-data';
 import { Collection } from '../../core/shared/collection.model';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeIn } from '../../shared/animations/fade';
 import { PaginatedList } from '../../core/data/paginated-list';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { CollectionDataService } from '../../core/data/collection-data.service';
 
 @Component({
   selector: 'ds-community-page-sub-collection-list',
@@ -16,9 +20,60 @@ import { PaginatedList } from '../../core/data/paginated-list';
 })
 export class CommunityPageSubCollectionListComponent implements OnInit {
   @Input() community: Community;
-  subCollectionsRDObs: Observable<RemoteData<PaginatedList<Collection>>>;
+
+  /**
+   * The pagination configuration
+   */
+  config: PaginationComponentOptions;
+
+  /**
+   * The pagination id
+   */
+  pageId = 'community-collections-pagination';
+
+  /**
+   * The sorting configuration
+   */
+  sortConfig: SortOptions;
+
+  /**
+   * A list of remote data objects of communities' collections
+   */
+  subCollectionsRDObs: BehaviorSubject<RemoteData<PaginatedList<Collection>>> = new BehaviorSubject<RemoteData<PaginatedList<Collection>>>({} as any);
+
+  constructor(private cds: CollectionDataService) {}
 
   ngOnInit(): void {
-    this.subCollectionsRDObs = this.community.collections;
+    this.config = new PaginationComponentOptions();
+    this.config.id = this.pageId;
+    this.config.pageSize = 5;
+    this.config.currentPage = 1;
+    this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
+    this.updatePage();
+  }
+
+  /**
+   * Called when one of the pagination settings is changed
+   * @param event The new pagination data
+   */
+  onPaginationChange(event) {
+    this.config.currentPage = event.page;
+    this.config.pageSize = event.pageSize;
+    this.sortConfig.field = event.sortField;
+    this.sortConfig.direction = event.sortDirection;
+    this.updatePage();
+  }
+
+  /**
+   * Update the list of collections
+   */
+  updatePage() {
+    this.cds.findByParent(this.community.id,{
+      currentPage: this.config.currentPage,
+      elementsPerPage: this.config.pageSize,
+      sort: { field: this.sortConfig.field, direction: this.sortConfig.direction }
+    }).pipe(take(1)).subscribe((results) => {
+      this.subCollectionsRDObs.next(results);
+    });
   }
 }