Angular 11 RxJS Observable Example

Hello,

In this short tutorial we will cover an angular 11 observable example. you will learn angular 11 rxjs observable example. In this article, we will implement a angular 11 http observable example. i would like to show you angular 11 observable with httpclient example. follow bellow step for observable in angular 11 example.

If you don't know how to use observable with httpclient request in angular application then i will help you getting done. we always prefer to use observable for http request that help to manage server request and monitor to server request. observable is provided by rxjs.

Here, i will give you very simple example with http request with observable in angular. we will use jsonplaceholder api to make api request. so let's follow some step to get example done, i also attach preview on bottom.

Step 1: Create New App

You can easily create your angular app using bellow command:

ng new my-new-app

Step 2: Import HttpClientModule

In this step, we need to import HttpClientModule to app.module.ts file. so let's import it as like bellow:

src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
  
import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http';
  
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 3: Create Post Class

In this step, we will simply create Post class and define data types of returning data. so let's create post.ts file and put bellow code:

src/app/post.ts

export class Post {
    constructor(
      public body: string,
      public id: number,
      public title: string,
      public userId: number
    ) {}
  }

Step 4: Create Service for Call API

Here, we need to create service for http client request. we will create service file and write client http request using observable code. this service will use in our component file. So let's create service and put bellow code:

ng g s post

Now let's add code as like bellow:

src/app/post.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Post } from './post';
  
@Injectable({
  providedIn: 'root'
})
export class PostService {
    
  private url: string = 'https://jsonplaceholder.typicode.com/posts';
  constructor(private httpClient: HttpClient) { }
  
  public getPosts(): Observable<Post[]>{
    return this.httpClient.get<Post[]>(this.url);
  }
  
}

Step 5: Use Service to Component

Now we have to use this services to our app component. So let's updated code as like bellow:

src/app/app.component.ts

import { Component, OnInit } from '@angular/core';
import { PostService } from './post.service';
import { Post } from './post';
  
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  name = 'Angular';
  
  posts = new Array<Post>();
    
  constructor(private service:PostService) {}
    
  ngOnInit() {
      this.service.getPosts().subscribe(response => {
          this.posts = response.map(item => 
            {
              return new Post( 
                  item.body,
                  item.id,
                  item.title,
                  item.userId
              );
            });
        });
  }
}

Step 6: Updated View File

Now here, we will updated our html file. let's put bellow code:

I used bootstrap class on this form. if you want to add than then follow this link too: Install Boorstrap 4 to Angular 9.

src/app/app.component.html

<div class="container">
  <h1>Angular 8/9 Observables HttpClient Example - ItSolutionStuff.com</h1>
  
  <table class="table table-bordered">
    <tr>
      <th>ID</th>
      <th>Body</th>
      <th>Title</th>
      <th>UserID</th>
    </tr>
    <tr *ngFor="let post of posts">
      <td>{{ post.id }}</td>
      <td>{{ post.body }}</td>
      <td>{{ post.title }}</td>
      <td>{{ post.userId }}</td>
    </tr>
  </table>
</div>

Now we are ready to run our example, you can run by following command:

ng serve

You can simply see preview as like bellow:

I hope it can help you...