Book Image

Angular Services

By : Sohail Salehi
Book Image

Angular Services

By: Sohail Salehi

Overview of this book

A primary concern with modern day applications is that they need to be dynamic, and for that, data access from the server side, data authentication, and security are very important. Angular leverages its services to create such state-of-the-art dynamic applications. This book will help you create and design customized services, integrate them into your applications, import third-party plugins, and make your apps perform better and faster. This book starts with a basic rundown on how you can create your own Angular development environment compatible with v2 and v4. You will then use Bootstrap and Angular UI components to create pages. You will also understand how to use controllers to collect data and populate them into NG UIs. Later, you will then create a rating service to evaluate entries and assign a score to them. Next, you will create "cron jobs" in NG. We will then create a crawler service to find all relevant resources regarding a selected headline and generate reports on it. Finally, you will create a service to manage accuracy and provide feedback about troubled areas in the app created. This book is up to date for the 2.4 release and is compatible with the 4.0 release as well, and it does not have any code based on the beta or release candidates.
Table of Contents (15 chapters)
Angular Services
About the Author
About the Reviewer
Customer Feedback

Accessing a component via root

In order to use the collector component inside the root component (app.ts) we need to inform the root about it. So declare the CollectorComponent inside the app.modules.ts.


Notice that as soon as you add the CollectorComponent in the declarations array, WebStorm IDE imports the related class automatically.

If you are not using WebStorm, you need to manually import the collector.component.ts into the root otherwise you will get an error later:

// src/app/app.ts 
import {CollectorComponent}from "./collector/collector.component"; 

Also don't forget to declare the new component in the module file:

// src/app/app.modue.ts 
import {CollectorComponent} from "./collector/collector.component"; 
  declarations: [AppComponent, NavigationComponent, CollectorComponent], 
export class AppModule { 

Now that we have the Collector component imported, we have access to its selector. To prove that, edit the app.html as follows...