Refactored the clear input field handling for search to new observable

UI/Web/src/app/_services/search.service.ts

@@ -1,6 +1,5 @@
 import { HttpClient } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { Subject } from '@microsoft/signalr';
 import { distinctUntilChanged, filter, map, Observable, of, ReplaySubject, startWith, switchMap } from 'rxjs';
 import { environment } from 'src/environments/environment';
 import { SearchResultGroup } from '../_models/search/search-result-group';
@@ -13,27 +12,23 @@ export class SearchService {
 
   baseUrl = environment.apiUrl;
 
-  private searchSubject: ReplaySubject<string> = new ReplaySubject();
+  private searchSubject: ReplaySubject<string> = new ReplaySubject(1);
   searchResults$: Observable<SearchResultGroup>;
 
   constructor(private httpClient: HttpClient) {
     this.searchResults$ = this.searchSubject.pipe(
       startWith(''),
       map(val => val.trim()),
-      filter(term => term !== '' && term !== null && term !== undefined),
       distinctUntilChanged(),
       switchMap(term => {
-        return this.httpClient.get<SearchResultGroup>(this.baseUrl + 'search/search?queryString=' + encodeURIComponent(term));
+        if (term === '' || term === null || term === undefined) return of(new SearchResultGroup());
+        return this.httpClient.get<SearchResultGroup>(this.baseUrl + 'search/search?queryString=' + encodeURIComponent(term))
       })
     );
   }
 
   search(term: string) {
     this.searchSubject.next(term);
-    if (term === '') {
-      return of(new SearchResultGroup());
-    }
-    return this.httpClient.get<SearchResultGroup>(this.baseUrl + 'search/search?queryString=' + encodeURIComponent(term));
   }
 
   getSeriesForMangaFile(mangaFileId: number) {

UI/Web/src/app/cards/edit-series-relation/edit-series-relation.component.ts

@@ -129,11 +129,14 @@ export class EditSeriesRelationComponent implements OnInit, OnDestroy {
     seriesSettings.id = 'relation--' + index;
     seriesSettings.unique = true;
     seriesSettings.addIfNonExisting = false;
-    seriesSettings.fetchFn = (searchFilter: string) => this.searchService.search(searchFilter).pipe(
+    seriesSettings.fetchFn = (searchFilter: string) => {
+      this.searchService.search(searchFilter);
+      return this.searchService.searchResults$.pipe(
         map(group => group.series),
         map(items => seriesSettings.compareFn(items, searchFilter)),
         map(series => series.filter(s => s.seriesId !== this.series.id)),
       );
+    }
 
     seriesSettings.compareFn = (options: SearchResult[], filter: string) => {
       return options.filter(m => this.utilityService.filter(m.name, filter));
@@ -144,7 +147,8 @@ export class EditSeriesRelationComponent implements OnInit, OnDestroy {
     }
 
     if (series !== undefined) {
-      return this.searchService.search(series.name).pipe(
+      this.searchService.search(series.name)
+      return this.searchService.searchResults$.pipe(
         map(group => group.series), map(results => {
           seriesSettings.savedData = results.filter(s => s.seriesId === series.id);
           return seriesSettings;

UI/Web/src/app/nav/nav-header/nav-header.component.html

@@ -192,7 +192,7 @@ NZ0ZV4zm4/L1dfnYNCrjTFq9G03rmj5D+Y4i0OHuL3GFPJytaM54AAAAAElFTkSuQmCC
               [minQueryLength]="2"
               initialValue=""
               placeholder="Search…"
-              [grouppedData]="(searchService.searchResults$ | async) || searchResults"
+              [grouppedData]="(search$ | async) || emptyResult"
               (inputChanged)="onChangeSearch($event)"
               (clearField)="clearSearch()"
               (focusChanged)="focusUpdate($event)"

UI/Web/src/app/nav/nav-header/nav-header.component.ts

@@ -1,8 +1,8 @@
 import { DOCUMENT } from '@angular/common';
 import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, Inject, OnDestroy, OnInit, ViewChild } from '@angular/core';
 import { NavigationEnd, Router } from '@angular/router';
-import { fromEvent, Subject } from 'rxjs';
+import { fromEvent, Observable, of, Subject } from 'rxjs';
-import { debounceTime, distinctUntilChanged, filter, takeUntil, tap } from 'rxjs/operators';
+import { catchError, debounceTime, distinctUntilChanged, filter, startWith, takeUntil, tap } from 'rxjs/operators';
 import { Chapter } from 'src/app/_models/chapter';
 import { MangaFile } from 'src/app/_models/manga-file';
 import { ScrollService } from 'src/app/_services/scroll.service';
@@ -31,7 +31,8 @@ export class NavHeaderComponent implements OnInit, OnDestroy {
   isLoading = false;
   debounceTime = 300;
   imageStyles = {width: '24px', 'margin-top': '5px'};
-  searchResults: SearchResultGroup = new SearchResultGroup();
+  emptyResult: SearchResultGroup = new SearchResultGroup();
+  search$!: Observable<SearchResultGroup>;
   searchTerm = '';
   customFilter: (items: SearchResult[], query: string) => SearchResult[] = (items: SearchResult[], query: string) => {
     const normalizedQuery = query.trim().toLowerCase();
@@ -54,6 +55,21 @@ export class NavHeaderComponent implements OnInit, OnDestroy {
     public imageService: ImageService, @Inject(DOCUMENT) private document: Document,
     private scrollService: ScrollService, public searchService: SearchService, private readonly cdRef: ChangeDetectorRef) {
       this.scrollElem = this.document.body;
+
+      this.search$ = this.searchService.searchResults$.pipe(
+        startWith(new SearchResultGroup()),
+        takeUntil(this.onDestroy),
+        tap((_) => {
+          this.isLoading = false;
+          this.cdRef.markForCheck();
+        }),
+        catchError(() => {
+          this.isLoading = false;
+          this.searchTerm = '';
+          this.cdRef.markForCheck();
+          return of();
+        })
+      );
     }
 
   ngOnInit(): void {
@@ -107,20 +123,8 @@ export class NavHeaderComponent implements OnInit, OnDestroy {
   onChangeSearch(val: string) {
       this.isLoading = true;
       this.searchTerm = val.trim();
+      this.searchService.search(val);
       this.cdRef.markForCheck(); 
-
-      this.searchService.search(val.trim());
-
-      this.searchService.search(val.trim()).pipe(takeUntil(this.onDestroy)).subscribe((results: SearchResultGroup) => {
-        //this.searchResults = results;
-        this.isLoading = false;
-        this.cdRef.markForCheck();
-      }, err => {
-        this.searchResults.reset();
-        this.isLoading = false;
-        this.searchTerm = '';
-        this.cdRef.markForCheck();
-      });
   }
 
   goTo(queryParamName: string, filter: any) {
@@ -173,7 +177,7 @@ export class NavHeaderComponent implements OnInit, OnDestroy {
   clearSearch() {
     this.searchViewRef.clear();
     this.searchTerm = '';
-    this.searchResults = new SearchResultGroup();
+    this.searchService.search('');
     this.cdRef.markForCheck();
   }