Angular 9 Http Request with Observable Example

Angular 9 Http Request with Observable Example

In this post we will give you information about Angular 9 Http Request with Observable Example. Hear we will give you detail about Angular 9 Http Request with Observable ExampleAnd how to use it also give you demo for it if it is necessary.

Now, let’s see tutorial of angular 9 observable httpclient example. step by step explain angular 9 observable http request example. In this article, we will implement a http request with observables angular 9. We will look at example of angular 9 observable and http request. Alright, let’s dive into the steps.

If you don’t know how to use observable with httpclient request in angular 9 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 9. 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 >

<h1>Angular 8/9 Observables HttpClient Example - ItSolutionStuff.com</h1>

<table >

<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…

Hope this code and post will helped you for implement Angular 9 Http Request with Observable Example. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs

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