Added pagination to community's sub-community list in the community page

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

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

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

@@ -1,21 +1,26 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 import { TranslateModule } from '@ngx-translate/core';
 import { NO_ERRORS_SCHEMA } from '@angular/core';
-import {CommunityPageSubCommunityListComponent} from './community-page-sub-community-list.component';
-import {Community} from '../../core/shared/community.model';
-import {RemoteData} from '../../core/data/remote-data';
-import {PaginatedList} from '../../core/data/paginated-list';
-import {PageInfo} from '../../core/shared/page-info.model';
-import {SharedModule} from '../../shared/shared.module';
 import { RouterTestingModule } from '@angular/router/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
 import { By } from '@angular/platform-browser';
-import {of as observableOf,  Observable } from 'rxjs';
+
+import { CommunityPageSubCommunityListComponent } from './community-page-sub-community-list.component';
+import { Community } from '../../core/shared/community.model';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { SharedModule } from '../../shared/shared.module';
 import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { FindListOptions } from '../../core/data/request.models';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { CommunityDataService } from '../../core/data/community-data.service';
 
 describe('SubCommunityList Component', () => {
   let comp: CommunityPageSubCommunityListComponent;
   let fixture: ComponentFixture<CommunityPageSubCommunityListComponent>;
+  let communityDataServiceStub: any;
+  let subCommList = [];
 
   const subcommunities = [Object.assign(new Community(), {
     id: '123456789-1',
@@ -32,27 +37,76 @@ describe('SubCommunityList Component', () => {
           { language: 'en_US', value: 'SubCommunity 2' }
         ]
       }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '12345678942',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 7' }
+        ]
+      }
     })
   ];
 
-  const emptySubCommunitiesCommunity = Object.assign(new Community(), {
+  const mockCommunity = Object.assign(new Community(), {
+    id: '123456789',
     metadata: {
       'dc.title': [
         { language: 'en_US', value: 'Test title' }
       ]
-    },
-    subcommunities: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), []))
+    }
   });
 
-  const mockCommunity = Object.assign(new Community(), {
-      metadata: {
-        'dc.title': [
-          { language: 'en_US', value: 'Test title' }
-        ]
-      },
-      subcommunities: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subcommunities))
-    })
-  ;
+  communityDataServiceStub = {
+    findByParent(parentUUID: string, options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > subCommList.length) {
+        endPageIndex = subCommList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subCommList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
@@ -60,6 +114,10 @@ describe('SubCommunityList Component', () => {
         RouterTestingModule.withRoutes([]),
         NoopAnimationsModule],
       declarations: [CommunityPageSubCommunityListComponent],
+      providers: [
+        { provide: CommunityDataService, useValue: communityDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+      ],
       schemas: [NO_ERRORS_SCHEMA]
     }).compileComponents();
   }));
@@ -67,23 +125,47 @@ describe('SubCommunityList Component', () => {
   beforeEach(() => {
     fixture = TestBed.createComponent(CommunityPageSubCommunityListComponent);
     comp = fixture.componentInstance;
+    comp.community = mockCommunity;
+
   });
 
   it('should display a list of subCommunities', () => {
-    comp.community = mockCommunity;
+    subCommList = subcommunities;
     fixture.detectChanges();
 
     const subComList = fixture.debugElement.queryAll(By.css('li'));
-    expect(subComList.length).toEqual(2);
+    expect(subComList.length).toEqual(5);
     expect(subComList[0].nativeElement.textContent).toContain('SubCommunity 1');
     expect(subComList[1].nativeElement.textContent).toContain('SubCommunity 2');
+    expect(subComList[2].nativeElement.textContent).toContain('SubCommunity 3');
+    expect(subComList[3].nativeElement.textContent).toContain('SubCommunity 4');
+    expect(subComList[4].nativeElement.textContent).toContain('SubCommunity 5');
   });
 
   it('should not display the header when subCommunities are empty', () => {
-    comp.community = emptySubCommunitiesCommunity;
+    subCommList = [];
     fixture.detectChanges();
 
     const subComHead = fixture.debugElement.queryAll(By.css('h2'));
     expect(subComHead.length).toEqual(0);
   });
+
+  it('should update list of collection on pagination change', () => {
+    subCommList = subcommunities;
+    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('SubCommunity 6');
+    expect(collList[1].nativeElement.textContent).toContain('SubCommunity 7');
+  });
 });

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

@@ -1,11 +1,15 @@
 import { Component, Input, OnInit } from '@angular/core';
 
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
+
 import { RemoteData } from '../../core/data/remote-data';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeIn } from '../../shared/animations/fade';
 import { PaginatedList } from '../../core/data/paginated-list';
-import {Observable} from 'rxjs';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { CommunityDataService } from '../../core/data/community-data.service';
 
 @Component({
   selector: 'ds-community-page-sub-community-list',
@@ -18,9 +22,61 @@ import {Observable} from 'rxjs';
  */
 export class CommunityPageSubCommunityListComponent implements OnInit {
   @Input() community: Community;
-  subCommunitiesRDObs: Observable<RemoteData<PaginatedList<Community>>>;
+
+  /**
+   * The pagination configuration
+   */
+  config: PaginationComponentOptions;
+
+  /**
+   * The pagination id
+   */
+  pageId = 'community-subCommunities-pagination';
+
+  /**
+   * The sorting configuration
+   */
+  sortConfig: SortOptions;
+
+  /**
+   * A list of remote data objects of communities' collections
+   */
+  subCommunitiesRDObs: BehaviorSubject<RemoteData<PaginatedList<Community>>> = new BehaviorSubject<RemoteData<PaginatedList<Community>>>({} as any);
+
+  constructor(private cds: CommunityDataService) {
+  }
 
   ngOnInit(): void {
-    this.subCommunitiesRDObs = this.community.subcommunities;
+    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 sub-communities
+   */
+  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.subCommunitiesRDObs.next(results);
+    });
   }
 }