Added a minor loading animation when searching.

frontend/angular-seshat/src/app/library/add-new-page/add-new-page.component.css

@@ -30,7 +30,8 @@
     padding: 20px;
 }
 
-.results-error img, .results-end img {
+.results-error img,
+.results-end img {
     vertical-align: middle;
 }
 
@@ -40,4 +41,32 @@
 
 .filter-warning {
     filter: brightness(0) saturate(100%) invert(52%) sepia(95%) saturate(2039%) hue-rotate(3deg) brightness(106%) contrast(102%);
+}
+
+.loading {
+    width: fit-content;
+    font-weight: bold;
+    font-family: monospace;
+    font-size: 25px;
+    align-self: center;
+    padding: 5px;
+    margin: 20px;
+    background: radial-gradient(circle closest-side, #000 94%, #0000) right/calc(200% - 1em) 100%;
+    animation: l24 1s infinite alternate linear;
+}
+
+.loading::before {
+    content: "Loading...";
+    line-height: 1em;
+    color: #0000;
+    background: inherit;
+    background-image: radial-gradient(circle closest-side, #fff 94%, #000);
+    -webkit-background-clip: text;
+    background-clip: text;
+}
+
+@keyframes l24 {
+    100% {
+        background-position: left
+    }
 }

frontend/angular-seshat/src/app/library/add-new-page/add-new-page.component.html

@@ -1,21 +1,24 @@
-<div class="search-content">
-  <search-box
-   (searchOutput)="search.next($event)"
-   (filtersOutput)="filters.next($event)" />
+<div #scrollbar
+     class="search-content">
+  <search-box (searchOutput)="search.next($event)"
+              (filtersOutput)="filters.next($event)" />
   <div class="results-box"
        (scroll)="onResultsScroll($event)">
     @for (result of results; track $index) {
     <media-search-item class="result-item"
                        [media]="result" />
     }
+    @if (busy()) {
+      <div class="loading"></div>
+    }
     @if (searchError() != null) {
-      <p class="results-error">
-        <img src="/icons/error_icon.svg"
-             alt="error icon"
-             class="filter-error" />
-        {{searchError()}}
-      </p>
-      }
+    <p class="results-error">
+      <img src="/icons/error_icon.svg"
+           alt="error icon"
+           class="filter-error" />
+      {{searchError()}}
+    </p>
+    }
     @if (endOfResults()) {
     <div class="results-end">
       <img src="/icons/warning_icon.svg"

frontend/angular-seshat/src/app/library/add-new-page/add-new-page.component.ts

@@ -1,9 +1,7 @@
-import { Component, inject, NgZone, OnDestroy, signal } from '@angular/core';
-import { AuthService } from '../../services/auth/auth.service';
+import { Component, ElementRef, inject, NgZone, OnDestroy, signal, ViewChild } from '@angular/core';
 import { ReactiveFormsModule } from '@angular/forms';
-import { BehaviorSubject, combineLatest, distinctUntilChanged, filter, scan, Subscription, tap, throttleTime } from 'rxjs';
+import { BehaviorSubject, combineLatest, debounceTime, distinctUntilChanged, filter, scan, Subscription, throttleTime } from 'rxjs';
 import { HttpClient, HttpErrorResponse } from '@angular/common/http';
-import { RedirectionService } from '../../services/redirection.service';
 import { BookSearchResultDto } from '../../shared/dto/book-search-result.dto';
 import { MediaSearchItemComponent } from '../media-search-item/media-search-item.component';
 import { SearchBoxComponent } from "../search-box/search-box.component";
@@ -21,17 +19,18 @@ import { SearchContextDto } from '../../shared/dto/search-context.dto';
   styleUrl: './add-new-page.component.css'
 })
 export class AddNewPageComponent implements OnDestroy {
-  private readonly _auth = inject(AuthService);
   private readonly _http = inject(HttpClient);
-  private readonly _redirect = inject(RedirectionService);
   private readonly _subscriptions: Subscription[] = [];
   private readonly _zone = inject(NgZone);
 
+  @ViewChild('scrollbar') private readonly searchContentRef: ElementRef<Element> = {} as ElementRef;
+
   search = new BehaviorSubject<string>('');
   filters = new BehaviorSubject<SearchContextDto>(new SearchContextDto());
   page = new BehaviorSubject<number>(0);
   results: BookSearchResultDto[] = [];
   resultsPerPage = signal<number>(10);
+  busy = signal<boolean>(false);
   endOfResults = signal<boolean>(false);
   searchError = signal<string | null>(null);
 
@@ -45,13 +44,14 @@ export class AddNewPageComponent implements OnDestroy {
           ),
           filters: this.filters,
           page: this.page.pipe(
-            throttleTime(1500, undefined, { leading: true, trailing: true }),
+            throttleTime(1500, undefined, { leading: false, trailing: true }),
           ),
         }).pipe(
           filter(entry => entry.search!.length > 1),
-          throttleTime(1000, undefined, { leading: false, trailing: true }),
+          debounceTime(1000),
           scan((acc, next) => {
             // New searches means resetting to page 0.
+            // Ignore if user is busy loading new pages.
             if (acc.search != next.search) {
               this.results = [];
               return {
@@ -65,8 +65,10 @@ export class AddNewPageComponent implements OnDestroy {
               return acc;
             }
 
-            // Ignore further searching on the same search term.
-            if (this.endOfResults()) {
+            // Ignore further page searching if:
+            // - there are no more results;
+            // - user is still busy loading new pages.
+            if (this.endOfResults() || this.busy()) {
               return {
                 ...next,
                 page: -1,
@@ -79,10 +81,12 @@ export class AddNewPageComponent implements OnDestroy {
               page: Math.min(acc.page + 1, next.page),
             };
           }),
-          distinctUntilChanged(),
           filter(entry => entry.page >= 0),
-          tap(_ => this.endOfResults.set(false)),
+          distinctUntilChanged(),
         ).subscribe((entry) => {
+          this.busy.set(true);
+          this.endOfResults.set(false);
+          this.searchContentRef.nativeElement.scrollTop = 0;
           this._http.get('/api/providers/search',
             {
               params: {
@@ -99,8 +103,10 @@ export class AddNewPageComponent implements OnDestroy {
               if (results.length < this.resultsPerPage()) {
                 this.endOfResults.set(true);
               }
+              this.busy.set(false);
             },
             error: (err) => {
+              this.busy.set(false);
               if (err instanceof HttpErrorResponse) {
                 if (err.status == 400) {
                   this.searchError.set('Something went wrong when Google received the request.');
@@ -128,7 +134,7 @@ export class AddNewPageComponent implements OnDestroy {
     const limit = scroll.scrollHeight - scroll.clientHeight;
 
     // Prevent page changes when:
-    //  - new search is happening (emptying results);
+    //  - new search is happening (emptied results);
     //  - still scrolling through current content.
     if (scroll.scrollTop == 0 || scroll.scrollTop < limit - 25) {
       return;