fix 5310 : show social links bar on non-scrollable item pages

src/app/social/social.component.html

@@ -1,4 +1,4 @@
-<div id="dspace-a2a" [class.d-none]="(showOnCurrentRoute$ | async) !== true" data-a2a-scroll-show="0,60"
+<div id="dspace-a2a" [class.d-none]="(showOnCurrentRoute$ | async) !== true" [attr.data-a2a-scroll-show]="pageIsScrollable ? '0,60' : null"
   class="a2a_kit a2a_kit_size_32 a2a_floating_style a2a_default_style" [attr.data-a2a-title]="title" [attr.data-a2a-url]="url">
   @for (button of buttonList; track button) {
     <a [class]="'a2a_button_' + button" [class.a2a_counter]="showCounters && button !== 'facebook'"></a>

src/app/social/social.component.ts

@@ -1,8 +1,15 @@
-import { AsyncPipe } from '@angular/common';
 import {
+  AsyncPipe,
+  isPlatformBrowser,
+} from '@angular/common';
+import {
+  AfterViewInit,
   ChangeDetectionStrategy,
+  ChangeDetectorRef,
   Component,
+  Inject,
   OnInit,
+  PLATFORM_ID,
 } from '@angular/core';
 import { Observable } from 'rxjs';
 
@@ -20,7 +27,7 @@ import { SocialService } from './social.service';
 /**
  * Component to render dynamically the social2 buttons using addToAny plugin
  */
-export class SocialComponent implements OnInit {
+export class SocialComponent implements OnInit, AfterViewInit {
 
   /**
    * The script containing the profile ID
@@ -35,8 +42,16 @@ export class SocialComponent implements OnInit {
   url: string;
   showCounters: boolean;
 
+  /**
+   * Whether the current page has a scrollbar or not.
+   * If false, we show the bar without waiting for scroll.
+   */
+  pageIsScrollable = true;
+
   constructor(
     private socialService: SocialService,
+    @Inject(PLATFORM_ID) private platformId: object,
+    private cdr: ChangeDetectorRef,
   ) {}
 
   ngOnInit() {
@@ -50,4 +65,11 @@ export class SocialComponent implements OnInit {
     }
   }
 
+  ngAfterViewInit() {
+    if (this.socialService.enabled && isPlatformBrowser(this.platformId)) {
+      this.pageIsScrollable = document.body.scrollHeight > window.innerHeight;
+      this.cdr.detectChanges();
+    }
+  }
+
 }