Xulla Angular

Instal·lar

sudo npm install -g @angular/cli [--force]
ng new my-app
cd my-app 
ng serve -o

CLI

• Component: ng g component my-new-component
• Directive: ng g directive my-new-directive
• Pipe: ng g pipe my-new-pipe
• Service: ng g service my-new-service
• Class: ng g class my-new-class
• Interface: ng g interface my-new-interface
• Enum: ng g enum my-new-enum
• Module: ng g module my-new-module
• Guard: ng g guard my-new-guard
• Afegir biblioteques: ng add @angular/material
• Actualitzar: ng update --all
• Compilar: ng build [--prod]
• Crear projecte: ng new angular-projecte

Reactivitat

• Interpolació normal: {{}}
• Atributs: <img [src]="product.imageUrl" alt="">
• Estils:

<td [ngStyle]="{'background-color': isEven?'red':'green'}">...</td>
<td [ngStyle]="{'width.px': width}">...</td> <!--width és una variable de TS-->
<td [ngStyle]="styleObject">...</td>  <!-- Variable de TS -->
<td [ngClass]="{'even': isEven, 'last': isLast}"></td>
<td [ngClass]="{'even': isEven, 'last active': isLast}"></td>
<td [ngClass]="classObject"></td> <!-- Variable de TS-->
 <p [ngStyle]="{'font-size': tamano+'px'}">Hola Mundo</p>
 <p [ngStyle]="{'font-size.px': tamano}">Hola Mundo</p>
 <p [style.fontSize.px]="tamano">Hola Mundo</p>
 <p [ngClass]="clase">Hola Mundo</p>
 <p [ngClass]="[clase, claseParrafo ]">Hola Mundo</p>
 <p [ngClass]="{'text-danger': danger, 'text-info': !danger}">Hola Mundo</p>

• Bidireccional: [(ngModel)] <input type="text" [(ngModel)]="filterSearch" class="form-control" name="filterDesc" id="filterDesc" placeholder="Filter..."> (Cal importar FormModule en app.module.ts)
• Esdeveniments: (click), (mouseenter),(keypress)... (click)="toggleImage()"

Directives

• *ngIF
• *ngFor
• Plantilla:I Plantilla:Cita
(index, first, last, even, odd)
• else ngSwitch i exemple de combinacions:

 <div *ngIf="show; else elseBlock">La condición es verdadera</div>
 <ng-template #elseBlock>La condición es falsa</ng-template>

     <span [ngSwitch]="property">
     <span *ngSwitchCase="'val1'">Value 1</span>
     <span *ngSwitchCase="'val2'">Value 2</span>
     <span *ngSwitchCase="'val3'">Value 3</span>
     <span *ngSwitchDefault>Other value</span>
     </span>

  <ng-container *ngFor="let person of persons"> <!-- Desaparece -->
    <ng-container *ngIf="person.age >= 18"> <!-- Desaparece -->
       <p>{{person | json}}</p> <!-- Sólo quedará este elemento -->
    </ng-container>
  </ng-container>

Rutes

Fitxer: app-routing.module.ts

Etiqueta: <router-outlet>

Rutes amb #: imports: [RouterModule.forRoot(routes, { useHash: true })],

Exemple:

const routes: Routes = [
   {path: 'home', component: HomeComponent},
   {path: 'planets', canActivate: [AuthGuard], component: PlanetListComponent},
   {path: 'suns', canActivate: [AuthGuard], component: SunComponent},
   {path: 'planet/:id', canActivate: [AuthGuard], component: PlanetDetailComponent},
   {path: 'planet/edit/:id', canActivate: [AuthGuard],
   resolve: {planet: PlanetResolveService},
   component: PlanetEditComponent},
 
   {path: 'login', component: LoginComponent},
   {path: '**', pathMatch: 'full', redirectTo: 'home'}
 ];

Cridar a les rutes: <a class="nav-link active" aria-current="page" [routerLink]="['home']" [routerLinkActive]="['active']">Home</a>

Cridar a les rutes per codi:

import { Router } from '@angular/router';
constructor( private router: Router ) {}
detailsProduct(id: number): void{   this.router.navigate(['/product', id]); }

Servicis HTTP

En app.module.ts, en imports: HttpClientModule i importat de: import { HttpClientModule } from '@angular/common/http';

Exemple bàsic:

constructor(private http: HttpClient) { }
getProducts(): Observable<Product[]>{
   return this.http.get<{products: Product[]}>(this.productURL).pipe(
     map(response => response.products)
     );
 }