Tutorial 8/g - Search by name

Author: amercier

src/app/app.module.ts

@@ -13,14 +13,16 @@ import { MessageService } from './message.service';
 import { AppRoutingModule } from './/app-routing.module';
 import { DashboardComponent } from './dashboard/dashboard.component';
 import { InMemoryDataService }  from './in-memory-data.service';
+import { HeroSearchComponent } from './hero-search/hero-search.component';
 
 @NgModule({
   declarations: [
     AppComponent,
     HeroesComponent,
     HeroDetailComponent,
     MessagesComponent,
-    DashboardComponent
+    DashboardComponent,
+    HeroSearchComponent
   ],
   imports: [
     BrowserModule,

src/app/dashboard/dashboard.component.html

@@ -6,3 +6,5 @@ <h4>{{hero.name}}</h4>
     </div>
   </a>
 </div>
+
+<app-hero-search></app-hero-search>

src/app/hero-search/hero-search.component.css

@@ -0,0 +1,39 @@
+/* HeroSearch private styles */
+.search-result li {
+  border-bottom: 1px solid gray;
+  border-left: 1px solid gray;
+  border-right: 1px solid gray;
+  width:195px;
+  height: 16px;
+  padding: 5px;
+  background-color: white;
+  cursor: pointer;
+  list-style-type: none;
+}
+
+.search-result li:hover {
+  background-color: #607D8B;
+}
+
+.search-result li a {
+  color: #888;
+  display: block;
+  text-decoration: none;
+}
+
+.search-result li a:hover {
+  color: white;
+}
+.search-result li a:active {
+  color: white;
+}
+#search-box {
+  width: 200px;
+  height: 20px;
+}
+
+
+ul.search-result {
+  margin-top: 0;
+  padding-left: 0;
+}

src/app/hero-search/hero-search.component.html

@@ -0,0 +1,13 @@
+<div id="search-component">
+  <h4>Hero Search</h4>
+
+  <input #searchBox id="search-box" (keyup)="search(searchBox.value)" />
+
+  <ul class="search-result">
+    <li *ngFor="let hero of heroes$ | async" >
+      <a routerLink="/detail/{{hero.id}}">
+        {{hero.name}}
+      </a>
+    </li>
+  </ul>
+</div>

src/app/hero-search/hero-search.component.spec.ts

@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { HeroSearchComponent } from './hero-search.component';
+
+describe('HeroSearchComponent', () => {
+  let component: HeroSearchComponent;
+  let fixture: ComponentFixture<HeroSearchComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ HeroSearchComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(HeroSearchComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/hero-search/hero-search.component.ts

@@ -0,0 +1,40 @@
+import { Component, OnInit } from '@angular/core';
+
+import { Observable, Subject } from 'rxjs';
+
+import {
+   debounceTime, distinctUntilChanged, switchMap
+ } from 'rxjs/operators';
+
+import { Hero } from '../hero';
+import { HeroService } from '../hero.service';
+
+@Component({
+  selector: 'app-hero-search',
+  templateUrl: './hero-search.component.html',
+  styleUrls: [ './hero-search.component.css' ]
+})
+export class HeroSearchComponent implements OnInit {
+  heroes$: Observable<Hero[]>;
+  private searchTerms = new Subject<string>();
+
+  constructor(private heroService: HeroService) {}
+
+  // Push a search term into the observable stream.
+  search(term: string): void {
+    this.searchTerms.next(term);
+  }
+
+  ngOnInit(): void {
+    this.heroes$ = this.searchTerms.pipe(
+      // wait 300ms after each keystroke before considering the term
+      debounceTime(300),
+
+      // ignore new term if same as previous term
+      distinctUntilChanged(),
+
+      // switch to new search observable each time the term changes
+      switchMap((term: string) => this.heroService.searchHeroes(term)),
+    );
+  }
+}

src/app/hero.service.ts

@@ -70,6 +70,18 @@ export class HeroService {
     );
   }
 
+  /* GET heroes whose name contains search term */
+  searchHeroes(term: string): Observable<Hero[]> {
+    if (!term.trim()) {
+      // if not search term, return empty hero array.
+      return of([]);
+    }
+    return this.http.get<Hero[]>(`api/heroes/?name=${term}`).pipe(
+      tap(_ => this.log(`found heroes matching "${term}"`)),
+      catchError(this.handleError<Hero[]>('searchHeroes', []))
+    );
+  }
+
   /**
    * Handle Http operation that failed.
    * Let the app continue.