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

Saving objects to the database

Now we can test the Firebase Realtime Database in our project. Let's modify the onChange() method in CollectorComponent and save a new object in the database every time a news items is checked. To do that, first we need to create a parent object in Firebase Realtime Database:

  1. In the Firebase console, select the Sherlock Project and click on Database in the sidebar:

  2. If you move the mouse over the project name, a plus sign appears with add child as tooltip. Click on the plus sign and enter Collector for the Name field. Leave the Value field empty and instead click on the plus sign for the Collector key and add the following values to it. Click the Add button when it is done:

  3. Click the Add button when it is done.

  4. Now open the Collector component, import the AngularFire module, and construct a new AngularFire object as follows:

            // src/app/collector/collector.component.ts 
            import {AngularFire, FirebaseObjectObservable} from "angularfire2...