Interview Questions and Answers

<div *ngIf="showElement">This element will be displayed if showElement is true</div>

<div [hidden]="hideElement">This element will be hidden if hideElement is true</div>

<div [innerHTML]="htmlResponse"></div>

                                            import { DomSanitizer, SafeHtml } from '@angular/platform-browser';

                                           

                                            constructor(private sanitizer: DomSanitizer) {}

                                           

<div [innerHTML]="sanitizedResponse"></div>

<div *ngIf="showElement">This element is added to the DOM if showElement is true</div>

<div [hidden]="hideElement">This element is visually hidden if hideElement is true</div>

import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from '@angular/router';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class MyRouteGuard implements CanActivate {
  canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    // Perform your logic to determine if the component should be activated
    const shouldActivate = true; // Replace with your own condition
    return shouldActivate;
  }
}
 

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { MyComponent } from './my-component.component';
import { MyRouteGuard } from './my-route.guard';

const routes: Routes = [
  {
    path: 'protected',
    component: MyComponent,
    canActivate: [MyRouteGuard]
  },
  // Other routes...
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }    

const observable = new Observable((observer) => {
    observer.next('Value 1');
    observer.next('Value 2');
    observer.complete();
});
      
const observer = {
    next: (value) => console.log('Received value:', value),
    error: (error) => console.error('An error occurred:', error),
    complete: () => console.log('Observable completed'),
    };
      
observable.subscribe(observer);

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

@Component({
    selector: 'app-my-component',
    templateUrl: './my-component.component.html',
    styleUrls: ['./my-component.component.css']
})
export class MyComponent { }

@Directive({
    selector: '[appHighlight]'
    })
export class HighlightDirective { }     

import { NgModule, APP_BASE_HREF } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@NgModule({
    declarations: [AppComponent],
    imports: [BrowserModule],
    providers: [{ provide: APP_BASE_HREF, useValue: '/my-base-href' }],
    bootstrap: [AppComponent]
})
export class AppModule { }       

import { Component, Inject } from '@angular/core';
import { APP_BASE_HREF } from '@angular/common';

@Component({
  // ...
})
export class MyComponent {
  constructor(@Inject(APP_BASE_HREF) private baseHref: string) {
    console.log('Base Href:', baseHref);
  }
}     

    import { RouterModule } from '@angular/router';     

const routes: Routes = [
{ path: 'home', component: HomeComponent },
{ path: 'about', component: AboutComponent },
    // ...
];

@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppModule { }   

<router-outlet></router-outlet>

@NgModule({
    // ...
    aot: true, // or aot: false
    })
export class MyModule { }