Make the size of a browse result page configurable.

src/app/browse-by/browse-by-metadata-page/browse-by-metadata-page.component.ts

@@ -17,6 +17,7 @@ import { StartsWithType } from '../../shared/starts-with/starts-with-decorator';
 import { BrowseByDataType, rendersBrowseBy } from '../browse-by-switcher/browse-by-decorator';
 import { PaginationService } from '../../core/pagination/pagination.service';
 import { map } from 'rxjs/operators';
+import { environment } from 'src/environments/environment';
 
 @Component({
   selector: 'ds-browse-by-metadata-page',
@@ -52,7 +53,7 @@ export class BrowseByMetadataPageComponent implements OnInit {
   paginationConfig: PaginationComponentOptions = Object.assign(new PaginationComponentOptions(), {
     id: 'bbm',
     currentPage: 1,
-    pageSize: 20
+    pageSize: environment.browseBy.pageSize,
   });
 
   /**

src/config/browse-by-config.interface.ts

@@ -1,21 +1,30 @@
 import { Config } from './config.interface';
 
 /**
- * Config that determines how the dropdown list of years are created for browse-by-date components
+ * Config that determines how the dropdown list of years are created for
+ * browse-by-date components.
  */
 export interface BrowseByConfig extends Config {
   /**
-   * The max amount of years to display using jumps of one year (current year - oneYearLimit)
+   * The max amount of years to display using jumps of one year
+   * (current year - oneYearLimit)
    */
   oneYearLimit: number;
 
   /**
-   * Limit for years to display using jumps of five years (current year - fiveYearLimit)
+   * Limit for years to display using jumps of five years
+   * (current year - fiveYearLimit)
    */
   fiveYearLimit: number;
 
   /**
-   * The absolute lowest year to display in the dropdown when no lowest date can be found for all items
+   * The absolute lowest year to display in the dropdown when no lowest date can
+   * be found for all items.
    */
   defaultLowerLimit: number;
+
+  /**
+   * Number of entries in the viewport of a paginated browse-by list.
+   */
+   pageSize: number;
 }

src/config/default-app-config.ts

@@ -193,7 +193,9 @@ export class DefaultAppConfig implements AppConfig {
     // Limit for years to display using jumps of five years (current year - fiveYearLimit)
     fiveYearLimit: 30,
     // The absolute lowest year to display in the dropdown (only used when no lowest date can be found for all items)
-    defaultLowerLimit: 1900
+    defaultLowerLimit: 1900,
+    // The number of entries in a paginated browse results list.
+    pageSize: 20
   };
 
   // Item Page Config

src/environments/environment.test.ts

@@ -192,6 +192,8 @@ export const environment: BuildConfig = {
     fiveYearLimit: 30,
     // The absolute lowest year to display in the dropdown (only used when no lowest date can be found for all items)
     defaultLowerLimit: 1900,
+    // The number of entries in a paginated browse results list.
+    pageSize: 20,
   },
   item: {
     edit: {