[DURACOM-304] Refactored item-bitstreams.component by removing page size of 9999

src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.html

@@ -39,6 +39,9 @@
                                    [isFirstTable]="isFirst"
                                    aria-describedby="reorder-description">
     </ds-item-edit-bitstream-bundle>
+    <div class="d-flex justify-content-center" *ngIf="showLoadMoreLink$ | async">
+      <div class="btn btn-link py-3" (click)="loadBundles()"> {{'item.edit.bitstreams.load-more.link' | translate}}</div>
+    </div>
   </div>
   <div *ngIf="bundles?.length === 0"
        class="alert alert-info w-100 d-inline-block mt-4" role="alert">

src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts

@@ -1,7 +1,7 @@
 import { ChangeDetectorRef, Component, NgZone, OnDestroy, HostListener } from '@angular/core';
 import { AbstractItemUpdateComponent } from '../abstract-item-update/abstract-item-update.component';
 import { map, switchMap, take } from 'rxjs/operators';
-import { Observable, Subscription, combineLatest } from 'rxjs';
+import { Observable, Subscription, combineLatest, BehaviorSubject, tap } from 'rxjs';
 import { ItemDataService } from '../../../core/data/item-data.service';
 import { ObjectUpdatesService } from '../../../core/data/object-updates/object-updates.service';
 import { ActivatedRoute, Router } from '@angular/router';
@@ -23,6 +23,7 @@ import { ResponsiveTableSizes } from '../../../shared/responsive-table-sizes/res
 import { NoContent } from '../../../core/shared/NoContent.model';
 import { ItemBitstreamsService } from './item-bitstreams.service';
 import { AlertType } from '../../../shared/alert/alert-type';
+import { PaginationComponentOptions } from "../../../shared/pagination/pagination-component-options.model";
 
 @Component({
   selector: 'ds-item-bitstreams',
@@ -40,7 +41,16 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
   /**
    * The currently listed bundles
    */
-  bundles$: Observable<Bundle[]>;
+  private bundlesSubject = new BehaviorSubject<Bundle[]>([]);
+
+  /**
+   * The page options to use for fetching the bundles
+   */
+  bundlesOptions: PaginationComponentOptions = Object.assign(new PaginationComponentOptions(), {
+    id: 'bundles-pagination-options',
+    currentPage: 1,
+    pageSize: 10,
+  });
 
   /**
    * The bootstrap sizes used for the columns within this table
@@ -64,6 +74,18 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
    */
   isProcessingMoveRequest: Observable<boolean>;
 
+  /**
+   * The flag indicating to show the load more link
+   */
+  showLoadMoreLink$: BehaviorSubject<boolean> = new BehaviorSubject(true);
+
+  /**
+   * The list of bundles for the current item as an observable
+   */
+  get bundles$(): Observable<Bundle[]> {
+    return this.bundlesSubject.asObservable();
+  }
+
   constructor(
     public itemService: ItemDataService,
     public objectUpdatesService: ObjectUpdatesService,
@@ -88,14 +110,8 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
    * Actions to perform after the item has been initialized
    */
   postItemInit(): void {
-    const bundlesOptions = this.itemBitstreamsService.getInitialBundlesPaginationOptions();
     this.isProcessingMoveRequest = this.itemBitstreamsService.getPerformingMoveRequest$();
-
+    this.loadBundles(1);
-    this.bundles$ = this.itemService.getBundles(this.item.id, new PaginatedSearchOptions({pagination: bundlesOptions})).pipe(
-      getFirstSucceededRemoteData(),
-      getRemoteDataPayload(),
-      map((bundlePage: PaginatedList<Bundle>) => bundlePage.page)
-    );
   }
 
   /**
@@ -160,6 +176,26 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
     this.notificationsPrefix = 'item.edit.bitstreams.notifications.';
   }
 
+  /**
+   * Load bundles for the current item
+   * @param currentPage The current page to load
+   */
+  loadBundles(currentPage?: number) {
+    this.bundlesOptions = Object.assign(new PaginationComponentOptions(), this.bundlesOptions, {
+      currentPage: currentPage || this.bundlesOptions.currentPage + 1,
+    });
+    this.itemService.getBundles(this.item.id, new PaginatedSearchOptions({pagination: this.bundlesOptions})).pipe(
+      getFirstSucceededRemoteData(),
+      getRemoteDataPayload(),
+      tap((bundlesPL: PaginatedList<Bundle>) =>
+        this.showLoadMoreLink$.next(bundlesPL.pageInfo.currentPage < bundlesPL.pageInfo.totalPages)
+      ),
+      map((bundlePage: PaginatedList<Bundle>) => bundlePage.page),
+    ).subscribe((bundles: Bundle[]) => {
+      this.bundlesSubject.next([...this.bundlesSubject.getValue(), ...bundles]);
+    });
+  }
+
 
   /**
    * Submit the current changes

src/assets/i18n/en.json5

@@ -2058,6 +2058,8 @@
 
   "item.edit.bitstreams.upload-button": "Upload",
 
+  "item.edit.bitstreams.load-more.link": "Load more",
+
   "item.edit.delete.cancel": "Cancel",
 
   "item.edit.delete.confirm": "Delete",