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Angular 8

i

Angular 8

ii Angular 8 is an open source, TypeScript based frontend web application framework. the architecture of Angular 8,setup simple project, data binding, then walks through forms, templates, routing and explains about Angular 8 new features. Finally, conclude with step by step working example. This tutorial is prepared for professionals who are aspiring to make a career in the field of Web application developer. This tutorial is intended to make you comfortable in getting started with the Angular8 concepts with examples. Before proceeding with the various types of concepts given in this tutorial, we assume that the readers have the basic knowledge on HTML, CSS and OOPS concepts. In addition to this, it will be very helpful, if the readers have a sound knowledge on TypeScript and

JavaScript.

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Angular 8

i

Table of Contents ............................................................................................................................................. i

1. Angular 8 - Introduction ........................................................................................................................... 1

Comparison of angular versions ...................................................................................................................... 1

Applications ..................................................................................................................................................... 2

Angular 8 installation ....................................................................................................................................... 3

Component ...................................................................................................................................................... 9

Template........................................................................................................................................................ 10

Modules ......................................................................................................................................................... 11

Services .......................................................................................................................................................... 13

Workflow of Angular application................................................................................................................... 13

Add a component .......................................................................................................................................... 16

Templates ...................................................................................................................................................... 17

Include bootstrap .......................................................................................................................................... 19

One-way data binding ................................................................................................................................... 24

Event binding ................................................................................................................................................. 25

Property binding ............................................................................................................................................ 26

Attribute binding ........................................................................................................................................... 27

Class binding .................................................................................................................................................. 28

Style binding .................................................................................................................................................. 30

Two-way data binding ................................................................................................................................... 31

Angular 8

ii

DOM Overview .............................................................................................................................................. 37

Structural directives ...................................................................................................................................... 37

Attribute directives ........................................................................................................................................ 42

Custom directives .......................................................................................................................................... 45

Component directives ................................................................................................................................... 47

Adding parameters ........................................................................................................................................ 53

Chained pipes ................................................................................................................................................ 54

Built-in Pipes .................................................................................................................................................. 54

Creating custom pipe .................................................................................................................................... 59

Observable..................................................................................................................................................... 62

Subscribing process ....................................................................................................................................... 63

Operations ..................................................................................................................................................... 64

Create Angular service................................................................................................................................... 69

Register Angular service ................................................................................................................................ 69

Resolve Angular service ................................................................................................................................. 71

Dependency Injector Providers ..................................................................................................................... 74

Angular Service usage .................................................................................................................................... 75

Add a debug service ...................................................................................................................................... 76

Expense REST API .......................................................................................................................................... 82

Configure Http client ..................................................................................................................................... 88

HTTP GET ....................................................................................................................................................... 89

HTTP POST ..................................................................................................................................................... 95

HTTP PUT ....................................................................................................................................................... 95

HTTP DELETE .................................................................................................................................................. 96

Angular 8

iii

Configure Angular Material ........................................................................................................................... 97

Configure Routing ........................................................................................................................................ 102

Creating routes ............................................................................................................................................ 104

Accessing routes .......................................................................................................................................... 104

Access Route parameters ............................................................................................................................ 106

Nested routing ............................................................................................................................................. 107

Configuring animation module .................................................................................................................... 113

Concepts ...................................................................................................................................................... 114

Template driven forms ................................................................................................................................ 121

Reactive Forms ............................................................................................................................................ 124

RequiredValidator ....................................................................................................................................... 128

PatternValidator .......................................................................................................................................... 130

Guards in Routing ........................................................................................................................................ 133

Angular Universal ........................................................................................................................................ 153

Verify CLI ...................................................................................................................................................... 160

Angular 8

iv

Unit Test ...................................................................................................................................................... 167

End to End (E2E) Testing .............................................................................................................................. 168

Advantages of Ivy Compiler ......................................................................................................................... 169

How to use Ivy? ........................................................................................................................................... 169

Create an application .................................................................................................................................. 173

Add a component ........................................................................................................................................ 175

Include bootstrap ........................................................................................................................................ 176

Add an interface .......................................................................................................................................... 180

Using directives ........................................................................................................................................... 182

Use pipes ..................................................................................................................................................... 186

Add debug service ....................................................................................................................................... 187

Create expense service ................................................................................................................................ 192

Http programming using HttpClient service ................................................................................................ 194

Add Routing ................................................................................................................................................. 198

Enable login and logout feature .................................................................................................................. 203

Add / Edit / Delete Expenses ....................................................................................................................... 211

29. Angular 9 ͸ What's New͍ .................................................................................................................... 224

Install Angular 9 ........................................................................................................................................... 224

Angular 9 Updates ....................................................................................................................................... 224

Conclusion ................................................................................................................................................... 225

Angular 8

1 Angular 8 is a TypeScript based full-stack web framework for building web and mobile applications. One of the major advantage is that the Angular 8 support for web application that can fit in any screen resolution. Angular application is fully compatible for mobiles, tablets, laptops or desktops. Angular 8 has an excellent user interface library for web developers which contains reusable UI components. This functionality helps us to create Single Page Applications (SPA). SPA is reactive and fast application. For example, if you have a button in single page and click on the button then the action performs dynamically in the current page without loading the new page from the server. Angular 8 is Typescript based object oriented programming and support features for server side programming as well. As we know already, Google releases the version of Angular for the improvement of mobile and web development capabilities. All the released versions are backward comparison of released versions.

AngularJS

AngularJs is very powerful JavaScript framework. It was released in October 2010. AngularJS based on Model View Controller (MVC) architecture and automatically handles

JavaScript code suitable for each browser.

Angular 2.0

Angular 2.0 was released in September 2016. It is re-engineered and rewritten version of AngularJS. AngularJs had a focus on controllers but, version 2 has changed focus on components. Components are the main building block of application. It supports features for speed in rendering, updating pages and building cross-platform native mobile apps for

Google Android and iOS.

Angular 4.0

Angular 4.0 was released in March 2017. It is updated to TypeScript 2.2, supports ng if- else conditions whereas Angular 2 supported only if conditions. Angular 4.0 introduces animation packages, Http search parameters and finally angular 4 applications are smaller and faster.

Angular 5.0

Angular 5.0 was released in November 2017. It supported some of the salient features such as HTTPClient API, Lambda support, Improved Compiler and build optimizer.

Angular 6.0

1. Angular 8 ͸ Introduction

Angular 8

2 Angular 6.0 was released in May 2018. Features added to this version are updated Angular CLI, updated CDK, updated Angular Material, multiple validators and usage of reactive JS library.

Angular 7.0

Angular 7.0 was released in October 2018. Some of salient features are Google supported community, POJO based development, modular structure, declarative user interface and modular structure.

Angular 8 New features

Angular 8 comes up with the following new attractive features: Bazel support - If your application uses several modules and libraries, Bazel concurrent builds helps to load faster in your application. Lazy loading - Angular 8 splits AppRoutingModule into smaller bundles and loads the data in the DOM. Differential loading - When you create an application, Angular CLI generates modules and this will be loaded automatically then browser will render the data. Web worker - It is running in the background, without affecting the performance of a page. Improvement of CLI workflow - Angular 8 CLI commands ng-build, ng-test and ng-run are extended to third party libraries. Router Backward Compatibility - Angular router backward compatibility feature helps to create path for larger projects so user can easily add their coding with the help of lazy coding. Opt-in usage sharing - User can opt into share Angular CLI usage data. Some of the popular website using Angular Framework are listed below: Weather.com - It is one of the leading forecasting weather report website. Youtube - It is a video and sharing website hosted by Google. Netflix - It is a technology and media services provider.

PayPal - It is an online payment system.

Angular 8

3 This chapter explains about how to install Angular 8 on your machine. Before moving to

Prerequisite

As we know already, Angular is written in TypeScript. We need Node and npm to compile the files into JavaScript after that, we can deploy our application. For this purpose, Node.js must be installed in your system. Hopefully, you have installed Node.js on your machine.

We can check it using the below command:

node --version You could see the version of node. It is show below: v14.2.0 If Node is not installed, you can download and install by visiting the following link: https://nodejs.org/en/download/. Angular 8 CLI installation is based on very simple steps. It will take not more than five minutes to install. npm is used to install Angular 8 CLI. Once Node.js is installed, npm is also installed. If you want verify it, type the below command: npm -v

You could see the version below:

6.14.4

npm install -g @angular/cli@^8.0.0 To verify Angular 8 is properly installed on your machine, type the below command:quotesdbs_dbs14.pdfusesText_20