[DURACOM-303] add grid layout, make SSR enabling configurable, minor restyle of skeletons

config/config.example.yml

@@ -25,6 +25,14 @@ ssr:
   inlineCriticalCss: false
   # Path prefixes to enable SSR for. By default these are limited to paths of primary DSpace objects.
   paths: [ '/home', '/items/', '/entities/', '/collections/', '/communities/', '/bitstream/', '/bitstreams/', '/handle/' ]
+  # Whether to enable rendering of Search component on SSR.
+  # If set to true the component will be included in the HTML returned from the server side rendering.
+  # If set to false the component will not be included in the HTML returned from the server side rendering.
+  enableSearchComponent: false,
+  # Whether to enable rendering of Browse component on SSR.
+  # If set to true the component will be included in the HTML returned from the server side rendering.
+  # If set to false the component will not be included in the HTML returned from the server side rendering.
+  enableBrowseComponent: false,
 
 # The REST API server settings
 # NOTE: these settings define which (publicly available) REST API to use. They are usually
@@ -84,7 +92,7 @@ cache:
     anonymousCache:
       # Maximum number of pages to cache. Default is zero (0) which means anonymous user cache is disabled.
       # As all pages are cached in server memory, increasing this value will increase memory needs.
-      # Individual cached pages are usually small (<100KB), so a value of max=1000 would only require ~100MB of memory. 
+      # Individual cached pages are usually small (<100KB), so a value of max=1000 would only require ~100MB of memory.
       max: 0
       # Amount of time after which cached pages are considered stale (in ms). After becoming stale, the cached
       # copy is automatically refreshed on the next request.
@@ -394,7 +402,7 @@ vocabularies:
     vocabulary: 'srsc'
     enabled: true
 
-# Default collection/community sorting order at Advanced search, Create/update community and collection when there are not a query. 
+# Default collection/community sorting order at Advanced search, Create/update community and collection when there are not a query.
 comcolSelectionSort:
   sortField: 'dc.title'
   sortDirection: 'ASC'

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

@@ -23,6 +23,7 @@ import { Community } from '../../core/shared/community.model';
 import { APP_CONFIG, AppConfig } from '../../../config/app-config.interface';
 import { DSONameService } from '../../core/breadcrumbs/dso-name.service';
 import { isPlatformServer } from "@angular/common";
+import { environment } from "../../../environments/environment";
 
 export const BBM_PAGINATION_ID = 'bbm';
 
@@ -147,7 +148,8 @@ export class BrowseByMetadataPageComponent implements OnInit, OnDestroy {
         currentPage: 1,
         pageSize: this.appConfig.browseBy.pageSize,
         });
-    }
+    this.renderOnServerSide = environment.ssr.enableBrowseComponent;
+  }
 
 
   ngOnInit(): void {

src/app/shared/search/search-filters/search-filter/search-filter.component.ts

@@ -1,4 +1,4 @@
-import { Component, Inject, Input, OnInit } from '@angular/core';
+import { Component, EventEmitter, Inject, Input, OnInit, Output } from '@angular/core';
 
 import { BehaviorSubject, Observable, of as observableOf } from 'rxjs';
 import { filter, map, startWith, switchMap, take } from 'rxjs/operators';
@@ -43,6 +43,8 @@ export class SearchFilterComponent implements OnInit {
    */
   @Input() scope: string;
 
+  @Output() isVisibilityComputed = new EventEmitter<boolean>();
+
   /**
    * True when the filter is 100% collapsed in the UI
    */
@@ -99,6 +101,9 @@ export class SearchFilterComponent implements OnInit {
         this.filterService.expand(this.filter.name);
       }
     });
+    this.active$.pipe(take(1)).subscribe(() => {
+      this.isVisibilityComputed.emit(true);
+    })
   }
 
   /**

src/app/shared/search/search-filters/search-filters.component.html

@@ -1,11 +1,12 @@
 <h3>{{"search.filters.head" | translate}}</h3>
-<div *ngIf="(filters | async)?.hasSucceeded; else skeleton;">
+<div *ngIf="(filters | async)?.hasSucceeded">
     <div *ngFor="let filter of (filters | async)?.payload; trackBy: trackUpdate">
-        <ds-search-filter [scope]="currentScope" [filter]="filter" [inPlaceSearch]="inPlaceSearch" [refreshFilters]="refreshFilters"></ds-search-filter>
+        <ds-search-filter (isVisibilityComputed)="countFiltersWithComputedVisibility($event)" [scope]="currentScope" [filter]="filter" [inPlaceSearch]="inPlaceSearch" [refreshFilters]="refreshFilters"></ds-search-filter>
     </div>
 </div>
 
-<ng-template #skeleton>
+
+<ng-container *ngIf="filtersWithComputedVisibility !== (filters | async)?.payload?.length">
   <ngx-skeleton-loader [count]="defaultFilterCount"/>
-</ng-template>
+</ng-container>
 <a class="btn btn-primary" [routerLink]="[searchLink]" [queryParams]="clearParams | async" queryParamsHandling="merge" role="button"><i class="fas fa-undo"></i> {{"search.filters.reset" | translate}}</a>

src/app/shared/search/search-filters/search-filters.component.ts

@@ -61,6 +61,11 @@ export class SearchFiltersComponent implements OnInit, OnDestroy {
    */
   searchLink: string;
 
+  /**
+   * Filters for which visibility has been computed
+   */
+  filtersWithComputedVisibility = 0;
+
   subs = [];
   defaultFilterCount: number;
 
@@ -114,4 +119,10 @@ export class SearchFiltersComponent implements OnInit, OnDestroy {
       }
     });
   }
+
+  countFiltersWithComputedVisibility(computed: boolean) {
+    if (computed) {
+      this.filtersWithComputedVisibility += 1;
+    }
+  }
 }

src/app/shared/search/search-results/search-results-skeleton/search-results-skeleton.component.html

@@ -1,24 +1,36 @@
 <div class="row flex-nowrap">
-  <div class="info-skeleton mb-2 col-12">
+  <div [class.mb-2]="(viewMode$ | async) === ViewMode.ListElement" class="info-skeleton col-12">
     <ngx-skeleton-loader/>
   </div>
 </div>
 
-@for (result of loadingResults; track result) {
-  <div class="row flex-nowrap result-row">
-    @if(showThumbnails) {
-      <div class="thumbnail-skeleton">
-        <ngx-skeleton-loader/>
+@if((viewMode$ | async) === ViewMode.ListElement) {
+  @for (result of loadingResults; track result) {
+      <div class="row flex-nowrap result-row">
+      @if(showThumbnails) {
+        <div class="thumbnail-skeleton">
+          <ngx-skeleton-loader/>
+        </div>
+      }
+      <div [class.col-9]="showThumbnails" [class.col-md-12]="!showThumbnails">
+        <div class="badge-skeleton">
+          <ngx-skeleton-loader/>
+        </div>
+        <div class="text-skeleton">
+          <ngx-skeleton-loader [count]="textLineCount"/>
+        </div>
+      </div>
+    </div>
+  }
+} @else if ((viewMode$ | async) === ViewMode.GridElement) {
+  <div class="card-columns row">
+    @for (result of loadingResults; track result) {
+      <div class="card-column col col-sm-6 col-lg-4">
+        <div class="card-skeleton">
+          <ngx-skeleton-loader/>
+        </div>
       </div>
     }
 
-    <div [class.col-9]="showThumbnails" [class.col-md-12]="!showThumbnails">
-      <div class="badge-skeleton">
-        <ngx-skeleton-loader/>
-      </div>
-      <div class="text-skeleton">
-        <ngx-skeleton-loader [count]="textLineCount"/>
-      </div>
-    </div>
   </div>
 }

src/app/shared/search/search-results/search-results-skeleton/search-results-skeleton.component.scss

@@ -1,4 +1,6 @@
 :host ::ng-deep {
+  --ds-wrapper-grid-spacing: calc(var(--bs-spacer) / 2);
+
   .info-skeleton, .badge-skeleton, .text-skeleton{
     ngx-skeleton-loader .skeleton-loader {
       height: var(--ds-search-skeleton-text-height);
@@ -27,13 +29,31 @@
     }
   }
 
+  .card-skeleton {
+    ngx-skeleton-loader .skeleton-loader {
+      height: var(--ds-search-skeleton-card-height);
+    }
+  }
+
   ngx-skeleton-loader .skeleton-loader {
     background-color: var(--bs-light);
     box-shadow: none;
   }
+
+  .card-columns {
+    margin-left: calc(-1 * var(--ds-wrapper-grid-spacing));
+    margin-right: calc(-1 * var(--ds-wrapper-grid-spacing));
+    column-gap: 0;
+
+    .card-column {
+      padding-left: var(--ds-wrapper-grid-spacing);
+      padding-right: var(--ds-wrapper-grid-spacing);
+    }
+  }
 }
 
 .result-row {
   margin-right: 0;
   margin-left: 0;
 }
+

src/app/shared/search/search-results/search-results-skeleton/search-results-skeleton.component.ts

@@ -1,10 +1,17 @@
+import {
+  AsyncPipe,
+  NgForOf,
+} from '@angular/common';
 import {
   Component,
   Input,
   OnInit,
 } from '@angular/core';
 import { NgxSkeletonLoaderModule } from 'ngx-skeleton-loader';
+import { Observable } from 'rxjs';
 
+import { SearchService } from '../../../../core/shared/search/search.service';
+import { ViewMode } from '../../../../core/shared/view-mode.model';
 import { hasValue } from '../../../empty.util';
 
 @Component({
@@ -12,6 +19,8 @@ import { hasValue } from '../../../empty.util';
   standalone: true,
   imports: [
     NgxSkeletonLoaderModule,
+    AsyncPipe,
+    NgForOf,
   ],
   templateUrl: './search-results-skeleton.component.html',
   styleUrl: './search-results-skeleton.component.scss',
@@ -26,8 +35,16 @@ export class SearchResultsSkeletonComponent implements OnInit {
   @Input()
   textLineCount = 2;
 
+  public viewMode$: Observable<ViewMode>;
+
   public loadingResults: number[];
 
+  protected readonly ViewMode = ViewMode;
+
+  constructor(private searchService: SearchService) {
+    this.viewMode$ = searchService.getViewMode();
+  }
+
   ngOnInit() {
     this.loadingResults = Array.from({ length: this.numberOfResults }, (_, i) => i + 1);
 

src/app/shared/search/search-results/search-results.component.html

@@ -1,12 +1,10 @@
-@if ((filters$ | async).length > 0 && isLoading()) {
+@if ((activeFilters$ | async).length > 0 && (appliedFilters$ | async).length === 0) {
   <div class="row">
     <div class="col-12">
-      <div class="d-flex">
-        @for (filter of (filters$| async); track filter.key) {
-          <div class="filter-badge-skeleton mr-2">
-            <ngx-skeleton-loader/>
+      <div class="filters-badge-skeleton-container">
+          <div class="filter-badge-skeleton">
+            <ngx-skeleton-loader [count]="(activeFilters$ | async).length" />
           </div>
-        }
       </div>
     </div>
   </div>

src/app/shared/search/search-results/search-results.component.scss

@@ -4,7 +4,14 @@
       background-color: var(--bs-light);
       box-shadow: none;
       width: var(--ds-search-skeleton-filter-badge-width);
-      height: var(--ds-search-skeleton-text-height);
+      height: var(--ds-search-skeleton-badge-height);
+      margin-bottom: 0;
+      margin-right: calc(var(--bs-spacer) / 4);
     }
   }
+
+  .filters-badge-skeleton-container {
+    display: flex;
+    max-height: var(--ds-search-skeleton-badge-height);
+  }
 }

src/app/shared/search/search-results/search-results.component.ts

@@ -14,6 +14,7 @@ import { PaginatedSearchOptions } from '../models/paginated-search-options.model
 import { SearchFilter } from "../models/search-filter.model";
 import { Observable } from "rxjs";
 import { SearchConfigurationService } from "../../../core/shared/search/search-configuration.service";
+import { SearchService } from "../../../core/shared/search/search.service";
 
 export interface SelectionConfig {
   repeatable: boolean;
@@ -110,7 +111,10 @@ export class SearchResultsComponent {
 
   @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
 
-  constructor(private searchConfigService: SearchConfigurationService) {
+  constructor(
+    protected searchConfigService: SearchConfigurationService,
+    protected searchService: SearchService,
+  ) {
     this.filters$ = this.searchConfigService.getCurrentFilters();
   }
 

src/app/shared/search/search.component.ts

@@ -49,6 +49,7 @@ import { COLLECTION_MODULE_PATH } from '../../collection-page/collection-page-ro
 import { COMMUNITY_MODULE_PATH } from '../../community-page/community-page-routing-paths';
 import { AppConfig, APP_CONFIG } from '../../../config/app-config.interface';
 import { isPlatformServer } from "@angular/common";
+import { environment } from 'src/environments/environment';
 
 @Component({
   selector: 'ds-search',
@@ -304,6 +305,7 @@ export class SearchComponent implements OnDestroy, OnInit {
               @Inject(PLATFORM_ID) public platformId: any,
   ) {
     this.isXsOrSm$ = this.windowService.isXsOrSm();
+    this.renderOnServerSide = environment.universal.enableSearchComponent;
   }
 
   /**

src/environments/environment.production.ts

@@ -10,5 +10,7 @@ export const environment: Partial<BuildConfig> = {
     time: false,
     inlineCriticalCss: false,
     paths: [ '/home', '/items/', '/entities/', '/collections/', '/communities/', '/bitstream/', '/bitstreams/', '/handle/' ],
-  }
+    enableSearchComponent: false,
+    enableBrowseComponent: false,
+  },
 };

src/environments/environment.test.ts

@@ -13,6 +13,8 @@ export const environment: BuildConfig = {
     time: false,
     inlineCriticalCss: false,
     paths: [ '/home', '/items/', '/entities/', '/collections/', '/communities/', '/bitstream/', '/bitstreams/', '/handle/' ],
+    enableSearchComponent: false,
+    enableBrowseComponent: false,
   },
 
   // Angular Universal server settings.

src/environments/environment.ts

@@ -15,7 +15,9 @@ export const environment: Partial<BuildConfig> = {
     time: false,
     inlineCriticalCss: false,
     paths: [ '/home', '/items/', '/entities/', '/collections/', '/communities/', '/bitstream/', '/bitstreams/', '/handle/' ],
-  }
+    enableSearchComponent: false,
+    enableBrowseComponent: false,
+  },
 };
 
 /*

src/styles/_custom_variables.scss

@@ -140,6 +140,7 @@
   --very-dark-cyan: #215E50; // This variable represents the background color of the save cookies button
 
   --ds-search-skeleton-text-height: 20px;
+  --ds-search-skeleton-badge-height: 18px;
   --ds-search-skeleton-thumbnail-height: 125px;
   --ds-search-skeleton-thumbnail-width: 90px;
   --ds-search-skeleton-thumbnail-padding: 1em;
@@ -148,6 +149,7 @@
   --ds-search-skeleton-badge-width: 75px;
   --ds-search-skeleton-filter-badge-width: 200px;
   --ds-search-skeleton-info-width: 200px;
+  --ds-search-skeleton-card-height: 435px;
 
   --ds-filters-skeleton-height: 40px;
   --ds-filters-skeleton-spacing: 12px;