Angular random quote #3

This is the third project of my ongoing challenge, 100 angular projects.

In this project, I created a web page which fetches a random quote from an API endpoint and displays it on the page.

Screen Shot Muse

I have learned a few new concepts while creating this simple web application, such as

  • using services to separate fetching data from components
  • using observable and Angular HttpClient for fetching data asynchronously and providing a way for the data to be consumed from a component
  • calling child component’s function from parent component using @ViewChild

Service, Observable and HttpClient for asynchronous API call

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { HttpClient } from '@angular/common/http';
@Injectable({
providedIn: 'root'
})
export class QuoteService {
private quoteUrl = "https://talaikis.com/api/quotes/random/";
getQuote(): Observable <{}> {
return this.http.get(this.quoteUrl)
};
constructor(
private http: HttpClient
) { }
}

view raw
quote.service.ts
hosted with ❤ by GitHub

Using service to get a random quote from a component

import { Component, OnInit } from '@angular/core';
import { QuoteService } from '../quote.service';
@Component({
selector: 'app-random-quote',
templateUrl: './random-quote.component.html',
styleUrls: ['./random-quote.component.css']
})
export class RandomQuoteComponent implements OnInit {
constructor(private quoteService: QuoteService) { }
getQuote(): void {
this.quoteService.getQuote()
.subscribe(quote => {
this.quote = '"' + quote['quote'] + '"';
this.author = '~' + quote['author']
});
}
quote: string;
author: string;
ngOnInit() {
this.getQuote();
}
}

Calling child component’s function from the parent component

import { Component, ViewChild } from '@angular/core';
import { RandomQuoteComponent } from './random-quote/random-quote.component'
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
@ViewChild(RandomQuoteComponent)
private randomQuoteComponent: RandomQuoteComponent;
title = 'Muse';
onClickMe() {
this.randomQuoteComponent.getQuote();
}
}

view raw
app.component.ts
hosted with ❤ by GitHub

Live address: http://5b3705ca02ed8359970e2262.silly-perlman-68e0f4.netlify.com/

Git: https://github.com/zkkmin/muse

 

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