Additions/55 back button navigation (#1016)

feat: new angular back button navigation challenge

apps/angular/55-back-button-navigation/src/app/app.component.html

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+<router-outlet></router-outlet>

apps/angular/55-back-button-navigation/src/app/app.component.ts

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+import { Component } from '@angular/core';
+import { RouterLink, RouterOutlet } from '@angular/router';
+
+@Component({
+  standalone: true,
+  imports: [RouterOutlet, RouterLink],
+  selector: 'app-root',
+  templateUrl: './app.component.html',
+})
+export class AppComponent {}

apps/angular/55-back-button-navigation/src/app/app.config.ts

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+import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
+import { provideRouter } from '@angular/router';
+import { APP_ROUTES } from './app.routes';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideZoneChangeDetection({ eventCoalescing: true }),
+    provideRouter(APP_ROUTES),
+  ],
+};

apps/angular/55-back-button-navigation/src/app/app.routes.ts

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+import { Routes } from '@angular/router';
+import { HomeComponent } from './home/home.component';
+import { SensitiveActionComponent } from './sensitive-action/sensitive-action.component';
+import { SimpleActionComponent } from './simple-action/simple-action.component';
+
+export const APP_ROUTES: Routes = [
+  {
+    path: '',
+    pathMatch: 'full',
+    redirectTo: 'home',
+  },
+  {
+    path: 'home',
+    component: HomeComponent,
+  },
+  {
+    path: 'simple-action',
+    component: SimpleActionComponent,
+  },
+  {
+    path: 'sensitive-action',
+    component: SensitiveActionComponent,
+  },
+];

apps/angular/55-back-button-navigation/src/app/dialog/dialog.component.html

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+<h2 mat-dialog-title>Delete file</h2>
+<mat-dialog-content>Would you like to delete cat.jpeg?</mat-dialog-content>
+<mat-dialog-actions>
+  <button mat-button mat-dialog-close>No</button>
+  <button mat-button mat-dialog-close cdkFocusInitial>Ok</button>
+</mat-dialog-actions>

apps/angular/55-back-button-navigation/src/app/dialog/dialog.component.ts

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+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { MatButtonModule } from '@angular/material/button';
+import {
+  MatDialogActions,
+  MatDialogClose,
+  MatDialogContent,
+  MatDialogRef,
+  MatDialogTitle,
+} from '@angular/material/dialog';
+
+@Component({
+  selector: 'app-dialog-dialog',
+  templateUrl: './dialog.component.html',
+  standalone: true,
+  imports: [
+    MatButtonModule,
+    MatDialogActions,
+    MatDialogClose,
+    MatDialogTitle,
+    MatDialogContent,
+  ],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class DialogComponent {
+  readonly dialogRef = inject(MatDialogRef<DialogComponent>);
+}

apps/angular/55-back-button-navigation/src/app/home/home.component.html

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+<a mat-raised-button routerLink="/simple-action" routerLinkActive="active">
+  Go to simple dialog action page
+</a>
+
+<a mat-raised-button routerLink="/sensitive-action" routerLinkActive="active">
+  Go to sensitive dialog action page
+</a>

apps/angular/55-back-button-navigation/src/app/home/home.component.ts

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+import { Component } from '@angular/core';
+import { MatButtonModule } from '@angular/material/button';
+import { RouterLink } from '@angular/router';
+
+@Component({
+  standalone: true,
+  imports: [MatButtonModule, RouterLink],
+  selector: 'app-home',
+  templateUrl: './home.component.html',
+})
+export class HomeComponent {}

apps/angular/55-back-button-navigation/src/app/sensitive-action/sensitive-action.component.html

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+<button mat-raised-button (click)="openDialog()">
+  Open dialog with confirmation dialog on browser back button click
+</button>

apps/angular/55-back-button-navigation/src/app/sensitive-action/sensitive-action.component.ts

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+import { Component, inject } from '@angular/core';
+import { MatButtonModule } from '@angular/material/button';
+import { MatDialog } from '@angular/material/dialog';
+import { DialogComponent } from '../dialog/dialog.component';
+
+@Component({
+  standalone: true,
+  imports: [MatButtonModule],
+  selector: 'app-sensitive-action',
+  templateUrl: './sensitive-action.component.html',
+})
+export class SensitiveActionComponent {
+  readonly #dialog = inject(MatDialog);
+
+  openDialog(): void {
+    this.#dialog.open(DialogComponent, {
+      width: '250px',
+    });
+  }
+}

apps/angular/55-back-button-navigation/src/app/simple-action/simple-action.component.html

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+<button mat-raised-button (click)="openDialog()">Open simple dialog</button>

apps/angular/55-back-button-navigation/src/app/simple-action/simple-action.component.ts

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+import { Component, inject } from '@angular/core';
+import { MatButtonModule } from '@angular/material/button';
+import { MatDialog } from '@angular/material/dialog';
+import { DialogComponent } from '../dialog/dialog.component';
+
+@Component({
+  standalone: true,
+  imports: [MatButtonModule],
+  selector: 'app-simple-action',
+  templateUrl: './simple-action.component.html',
+})
+export class SimpleActionComponent {
+  readonly #dialog = inject(MatDialog);
+
+  openDialog(): void {
+    this.#dialog.open(DialogComponent, {
+      width: '250px',
+    });
+  }
+}