"https"

src/app/app.module.ts

@@ -2,35 +2,41 @@ import { NgModule } from '@angular/core';
 import { BrowserModule } from '@angular/platform-browser';
 import { FormsModule } from '@angular/forms';
 import { HttpClientModule } from '@angular/common/http';
-import { AppComponent } from './app.component';
-import { ComponentOverviewComponent } from './components/component-overview/component-overview.component';
-import { HeroesComponent } from './components/heroes/heroes.component';
-import { MessagesComponent } from './components/messages/messages.component';
-import { HeroDetailComponent } from './components/hero-detail/hero-detail.component';
-import { AppRoutingModule } from './app-routing.module';
-import { DashboardComponent } from './components/dashboard/dashboard.component';
+
 import { HttpClientInMemoryWebApiModule } from 'angular-in-memory-web-api';
-import { InMemoryDataService } from './in-memory-data.service';
+import { InMemoryDataService } from './services/in-memory-data.service';
+
+import { AppRoutingModule } from './app-routing.module';
+
+import { AppComponent } from './app.component';
+import { DashboardComponent } from './components/dashboard/dashboard.component';
+import { HeroDetailComponent } from './components/hero-detail/hero-detail.component';
+import { HeroesComponent } from './components/heroes/heroes.component';
+import { HeroSearchComponent } from './components/hero-search/hero-search.component';
+import { MessagesComponent } from './components/messages/messages.component';
 
 @NgModule({
-  declarations: [
-    AppComponent,
-    ComponentOverviewComponent,
-    HeroesComponent,
-    MessagesComponent,
-    HeroDetailComponent,
-    DashboardComponent
-  ],
   imports: [
     BrowserModule,
     FormsModule,
-    HttpClientModule,
     AppRoutingModule,
+    HttpClientModule,
+
+    // The HttpClientInMemoryWebApiModule module intercepts HTTP requests
+    // and returns simulated server responses.
+    // Remove it when a real server is ready to receive requests.
     HttpClientInMemoryWebApiModule.forRoot(
       InMemoryDataService, { dataEncapsulation: false }
     )
   ],
-  providers: [],
-  bootstrap: [AppComponent]
+  declarations: [
+    AppComponent,
+    DashboardComponent,
+    HeroesComponent,
+    HeroDetailComponent,
+    MessagesComponent,
+    HeroSearchComponent
+  ],
+  bootstrap: [ AppComponent ]
 })
-export class AppModule { }
+export class AppModule { }

src/app/components/dashboard/dashboard.component.html

@@ -1,4 +1,9 @@
-<a *ngFor="let hero of heroes"
-  routerLink="/detail/{{hero.id}}">
-  {{hero.name}}
-</a>
+<h2>Top Heroes</h2>
+<div class="heroes-menu">
+  <a *ngFor="let hero of heroes"
+      routerLink="/detail/{{hero.id}}">
+      {{hero.name}}
+  </a>
+</div>
+
+<app-hero-search></app-hero-search>

src/app/components/hero-detail/hero-detail.component.html

@@ -6,4 +6,5 @@
     <input id="hero-name" [(ngModel)]="hero.name" placeholder="Hero name"/>
   </div>
   <button (click)="goBack()">go back</button>
+  <button (click)="save()">save</button>
 </div>

src/app/components/hero-detail/hero-detail.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit, Input } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
 import { Location } from '@angular/common';
 
@@ -11,7 +11,7 @@ import { HeroService } from '../../services/hero.service';
   styleUrls: [ './hero-detail.component.scss' ]
 })
 export class HeroDetailComponent implements OnInit {
-  @Input() hero?: Hero;
+  hero: Hero;
 
   constructor(
     private route: ActivatedRoute,
@@ -24,12 +24,17 @@ export class HeroDetailComponent implements OnInit {
   }
 
   getHero(): void {
-    const id = Number(this.route.snapshot.paramMap.get('id'));
-    this.heroService.getHero(id)
+    const id = this.route.snapshot.paramMap.get('id');
+    this.heroService.getHero(Number(id))
       .subscribe(hero => this.hero = hero);
   }
 
   goBack(): void {
     this.location.back();
   }
+
+  save(): void {
+    this.heroService.updateHero(this.hero)
+      .subscribe(() => this.goBack());
+  }
 }

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

@@ -0,0 +1,12 @@
+<div id="search-component">
+    <label for="search-box">Hero Search</label>
+    <input #searchBox id="search-box" (input)="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/components/hero-search/hero-search.component.scss

@@ -0,0 +1,47 @@
+/* HeroSearch private styles */
+
+label {
+    display: block;
+    font-weight: bold;
+    font-size: 1.2rem;
+    margin-top: 1rem;
+    margin-bottom: .5rem;
+  
+  }
+  input {
+    padding: .5rem;
+    width: 100%;
+    max-width: 600px;
+    box-sizing: border-box;
+    display: block;
+  }
+  
+  input:focus {
+    outline: #336699 auto 1px;
+  }
+  
+  li {
+    list-style-type: none;
+  }
+  .search-result li a {
+    border-bottom: 1px solid gray;
+    border-left: 1px solid gray;
+    border-right: 1px solid gray;
+    display: inline-block;
+    width: 100%;
+    max-width: 600px;
+    padding: .5rem;
+    box-sizing: border-box;
+    text-decoration: none;
+    color: black;
+  }
+  
+  .search-result li a:hover {
+    background-color: #435A60;
+    color: white;
+  }
+  
+  ul.search-result {
+    margin-top: 0;
+    padding-left: 0;
+  }

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

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

src/app/components/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 '../../interface/hero.interface';
+import { HeroService } from '../../services/hero.service';
+
+@Component({
+  selector: 'app-hero-search',
+  templateUrl: './hero-search.component.html',
+  styleUrls: [ './hero-search.component.scss' ]
+})
+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/components/heroes/heroes.component.html

@@ -1,8 +1,21 @@
+<h2>My Heroes</h2>
+
+<div>
+  <label id="new-hero">Hero name: </label>
+  <input for="new-hero" #heroName />
+
+  <!-- (click) passes input value to add() and then clears the input -->
+  <button class="add-button" (click)="add(heroName.value); heroName.value=''">
+    Add hero
+  </button>
+</div>
+
 <ul class="heroes">
-    <li *ngFor="let hero of heroes">
-      <a routerLink="/detail/{{hero.id}}">
-        <span class="badge">{{hero.id}}</span> {{hero.name}}
-      </a>
-    </li>
-  </ul>
-  <app-hero-detail [hero]="selectedHero"></app-hero-detail>
+  <li *ngFor="let hero of heroes">
+    <a routerLink="/detail/{{hero.id}}">
+      <span class="badge">{{hero.id}}</span> {{hero.name}}
+    </a>
+    <button class="delete" title="delete hero"
+      (click)="delete(hero)">x</button>
+  </li>
+</ul>

src/app/components/heroes/heroes.component.scss

@@ -1,52 +1,89 @@
 /* HeroesComponent's private CSS styles */
 .heroes {
-    margin: 0 0 2em 0;
-    list-style-type: none;
-    padding: 0;
-    width: 15em;
-  }
-  .heroes li {
-    cursor: pointer;
-    position: relative;
-    left: 0;
-    background-color: #EEE;
-    margin: .5em;
-    padding: .3em 0;
-    height: 1.6em;
-    border-radius: 4px;
-  }
-  .heroes li:hover {
-    color: #2c3a41;
-    background-color: #e6e6e6;
-    left: .1em;
-  }
-  .heroes li.selected {
-    background-color: black;
-    color: white;
-  }
-  .heroes li.selected:hover {
-    background-color: #505050;
-    color: white;
-  }
-  .heroes li.selected:active {
-    background-color: black;
-    color: white;
-  }
-  .heroes .badge {
-    display: inline-block;
-    font-size: small;
-    color: white;
-    padding: 0.8em 0.7em 0 0.7em;
-    background-color:#405061;
-    line-height: 1em;
-    position: relative;
-    left: -1px;
-    top: -4px;
-    height: 1.8em;
-    margin-right: .8em;
-    border-radius: 4px 0 0 4px;
-  }
-  
-  input {
-    padding: .5rem;
-  }
+  margin: 0 0 2em 0;
+  list-style-type: none;
+  padding: 0;
+  width: 15em;
+}
+
+input {
+  display: block;
+  width: 100%;
+  padding: .5rem;
+  margin: 1rem 0;
+  box-sizing: border-box;
+}
+
+.heroes li {
+  position: relative;
+  cursor: pointer;
+}
+
+.heroes li:hover {
+  left: .1em;
+}
+
+.heroes a {
+  color: #333;
+  text-decoration: none;
+  background-color: #EEE;
+  margin: .5em;
+  padding: .3em 0;
+  height: 1.6em;
+  border-radius: 4px;
+  display: block;
+  width: 100%;
+}
+
+.heroes a:hover {
+  color: #2c3a41;
+  background-color: #e6e6e6;
+}
+
+.heroes a:active {
+  background-color: #525252;
+  color: #fafafa;
+}
+
+.heroes .badge {
+  display: inline-block;
+  font-size: small;
+  color: white;
+  padding: 0.8em 0.7em 0 0.7em;
+  background-color:#405061;
+  line-height: 1em;
+  position: relative;
+  left: -1px;
+  top: -4px;
+  height: 1.8em;
+  min-width: 16px;
+  text-align: right;
+  margin-right: .8em;
+  border-radius: 4px 0 0 4px;
+}
+
+.add-button {
+ padding: .5rem 1.5rem;
+ font-size: 1rem;
+ margin-bottom: 2rem;
+}
+
+.add-button:hover {
+  color: white;
+  background-color: #42545C;
+}
+
+button.delete {
+  position: absolute;
+  left: 210px;
+  top: 5px;
+  background-color: white;
+  color:  #525252;
+  font-size: 1.1rem;
+  padding: 1px 10px 3px 10px;
+}
+
+button.delete:hover {
+  background-color: #525252;
+  color: white;
+}

src/app/components/heroes/heroes.component.ts

@@ -1,7 +1,7 @@
 import { Component, OnInit } from '@angular/core';
+
 import { Hero } from '../../interface/hero.interface';
 import { HeroService } from '../../services/hero.service';
-import { MessageService } from '../../services/message.service';
 
 @Component({
   selector: 'app-heroes',
@@ -9,23 +9,31 @@ import { MessageService } from '../../services/message.service';
   styleUrls: ['./heroes.component.scss']
 })
 export class HeroesComponent implements OnInit {
+  heroes: Hero[];
 
-  selectedHero?: Hero;
-
-  heroes: Hero[] = [];
-
-  constructor(private heroService: HeroService, private messageService: MessageService) { }
+  constructor(private heroService: HeroService) { }
 
   ngOnInit() {
     this.getHeroes();
   }
 
-  onSelect(hero: Hero): void {
-    console.log("heroes.component.ts excite onSelect")
-    this.selectedHero = hero;
-    this.messageService.add(`HeroesComponent: Selected hero id=${hero.id}`);
-  }
   getHeroes(): void {
     this.heroService.getHeroes()
-    .subscribe(heroes => this.heroes = heroes);  }
+    .subscribe(heroes => this.heroes = heroes);
+  }
+
+  add(name: string): void {
+    name = name.trim();
+    if (!name) { return; }
+    this.heroService.addHero({ name } as Hero)
+      .subscribe(hero => {
+        this.heroes.push(hero);
+      });
+  }
+
+  delete(hero: Hero): void {
+    this.heroes = this.heroes.filter(h => h !== hero);
+    this.heroService.deleteHero(hero.id).subscribe();
+  }
+
 }

src/app/services/hero.service.ts

@@ -1,27 +1,122 @@
 import { Injectable } from '@angular/core';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+
 import { Observable, of } from 'rxjs';
+import { catchError, map, tap } from 'rxjs/operators';
 
 import { Hero } from '../interface/hero.interface';
-import { HEROES } from '../interface/mock-heroes';
 import { MessageService } from './message.service';
 
-@Injectable({
-  providedIn: 'root',
-})
+
+@Injectable({ providedIn: 'root' })
 export class HeroService {
 
-  constructor(private messageService: MessageService) { }
+  private heroesUrl = 'api/heroes';  // URL to web api
+
+  httpOptions = {
+    headers: new HttpHeaders({ 'Content-Type': 'application/json' })
+  };
+
+  constructor(
+    private http: HttpClient,
+    private messageService: MessageService) { }
+
+  /** GET heroes from the server */
   getHeroes(): Observable<Hero[]> {
-    const heroes = of(HEROES);
-    this.messageService.add('HeroService: fetched heroes');
-    return heroes;
+    return this.http.get<Hero[]>(this.heroesUrl)
+      .pipe(
+        tap(_ => this.log('fetched heroes')),
+        catchError(this.handleError<Hero[]>('getHeroes', []))
+      );
   }
 
+  /** GET hero by id. Return `undefined` when id not found */
+  getHeroNo404<Data>(id: number): Observable<Hero> {
+    const url = `${this.heroesUrl}/?id=${id}`;
+    return this.http.get<Hero[]>(url)
+      .pipe(
+        map(heroes => heroes[0]), // returns a {0|1} element array
+        tap(h => {
+          const outcome = h ? `fetched` : `did not find`;
+          this.log(`${outcome} hero id=${id}`);
+        }),
+        catchError(this.handleError<Hero>(`getHero id=${id}`))
+      );
+  }
+
+  /** GET hero by id. Will 404 if id not found */
   getHero(id: number): Observable<Hero> {
-    // For now, assume that a hero with the specified `id` always exists.
-    // Error handling will be added in the next step of the tutorial.
-    const hero = HEROES.find(h => h.id === id) as Hero;
-    this.messageService.add(`HeroService: fetched hero id=${id}`);
-    return of(hero);
+    const url = `${this.heroesUrl}/${id}`;
+    return this.http.get<Hero>(url).pipe(
+      tap(_ => this.log(`fetched hero id=${id}`)),
+      catchError(this.handleError<Hero>(`getHero id=${id}`))
+    );
+  }
+
+  /* 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[]>(`${this.heroesUrl}/?name=${term}`).pipe(
+      tap(x => x.length ?
+         this.log(`found heroes matching "${term}"`) :
+         this.log(`no heroes matching "${term}"`)),
+      catchError(this.handleError<Hero[]>('searchHeroes', []))
+    );
+  }
+
+  //////// Save methods //////////
+
+  /** POST: add a new hero to the server */
+  addHero(hero: Hero): Observable<Hero> {
+    return this.http.post<Hero>(this.heroesUrl, hero, this.httpOptions).pipe(
+      tap((newHero: Hero) => this.log(`added hero w/ id=${newHero.id}`)),
+      catchError(this.handleError<Hero>('addHero'))
+    );
+  }
+
+  /** DELETE: delete the hero from the server */
+  deleteHero(id: number): Observable<Hero> {
+    const url = `${this.heroesUrl}/${id}`;
+
+    return this.http.delete<Hero>(url, this.httpOptions).pipe(
+      tap(_ => this.log(`deleted hero id=${id}`)),
+      catchError(this.handleError<Hero>('deleteHero'))
+    );
+  }
+
+  /** PUT: update the hero on the server */
+  updateHero(hero: Hero): Observable<any> {
+    return this.http.put(this.heroesUrl, hero, this.httpOptions).pipe(
+      tap(_ => this.log(`updated hero id=${hero.id}`)),
+      catchError(this.handleError<any>('updateHero'))
+    );
+  }
+
+  /**
+   * Handle Http operation that failed.
+   * Let the app continue.
+   * @param operation - name of the operation that failed
+   * @param result - optional value to return as the observable result
+   */
+  private handleError<T>(operation = 'operation', result?: T) {
+    return (error: any): Observable<T> => {
+
+      // TODO: send the error to remote logging infrastructure
+      console.error(error); // log to console instead
+
+      // TODO: better job of transforming error for user consumption
+      this.log(`${operation} failed: ${error.message}`);
+
+      // Let the app keep running by returning an empty result.
+      return of(result as T);
+    };
+  }
+
+  /** Log a HeroService message with the MessageService */
+  private log(message: string) {
+    this.messageService.add(`HeroService: ${message}`);
   }
 }

src/app/services/in-memory-data.service.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { InMemoryDataService } from './in-memory-data.service';
+
+describe('InMemoryDataService', () => {
+  let service: InMemoryDataService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(InMemoryDataService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

src/app/services/in-memory-data.service.ts

@@ -0,0 +1,33 @@
+import { Injectable } from '@angular/core';
+import { InMemoryDbService } from 'angular-in-memory-web-api';
+import { Hero } from '../interface/hero.interface';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class InMemoryDataService implements InMemoryDbService {
+  createDb() {
+    const heroes = [
+      { id: 11, name: 'Dr Nice' },
+      { id: 12, name: 'Narco' },
+      { id: 13, name: 'Bombasto' },
+      { id: 14, name: 'Celeritas' },
+      { id: 15, name: 'Magneta' },
+      { id: 16, name: 'RubberMan' },
+      { id: 17, name: 'Dynama' },
+      { id: 18, name: 'Dr IQ' },
+      { id: 19, name: 'Magma' },
+      { id: 20, name: 'Tornado' }
+    ];
+    return {heroes};
+  }
+
+  // Overrides the genId method to ensure that a hero always has an id.
+  // If the heroes array is empty,
+  // the method below returns the initial number (11).
+  // if the heroes array is not empty, the method below returns the highest
+  // hero id + 1.
+  genId(heroes: Hero[]): number {
+    return heroes.length > 0 ? Math.max(...heroes.map(hero => hero.id)) + 1 : 11;
+  }
+}