Angular 8 Tutorials - Learn Angular 8 Step By Step

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22 Jul 2022

Beginner

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Angular 8 Tutorials

The angular community has released another version of Angular which is known as Angular 8. The latest release of Google’s Angular Framework contains so many attractive features along with the new feature enhancement. It has arrived with a bunch of workflows and also a new powerful list of necessary features that Angular developers will appreciate it’s like a core framework such as Angular Material Library and Command-line Interface.

Google has also facilitated Angular Console as one of the important launch partners to run Angular Projects, combining Angular to the Firebase with the help of the Angular/Fire Packages, along with StackBlitz integrate IdE and Native Script support to build Native Mobile apps for Angular. So, in a short way, we can say that Angular 8 provides a group of new generation frameworks and libraries which came to support the development of more productive, maintainable, flexible, and testable web applications.

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What is Angular?

Angular is basically an open-source, JavaScript-based client-side framework that helps us to develop a web-based application. Angular is known as one of the best frameworks for developing any Single Page Application or SPA application. Angular is basically a structural framework for creating dynamic web applications. In a simple word, Angular is –

An MVC-based structured framework.
Support client-side templating features.
It is the framework that can easily develop Single Page Applications (SPA)
Provide us with the facility to perform unit tests so that our code can be tested before deployment.

What is Angular 8?

Angular is a framework of JavaScript which is being used to build mobile and web applications. Angular 8 is a client-side TypeScript based structure to create dynamic web applications. The first version of Angular was released by Google on the year 2012 with the named o Angular JS. Angular 8 is the updated version of all the previous Angular versions including Angular 2. Angular 8 is a great User Interface (UI) Library for developers.

It is a reusable UI component that helps us construct attractive, functional, and consistent web pages as well as web applications. Angular 8 is a JavaScript framework that will help us to create attractive Single Page Applications (SPAs). Angular 8 is totally supported on the component and acquires a tree structure with parent and child components. Angular 8 Classes are created in a way so that the web page can fit in any screen size and can be fully compatible with tablets, mobiles, laptops, and large systems.

What are Single Page Applications (SPA)?

A Single Page Application (SPA) is actually a web-based application or a website that can supply fluid, fast and reactive applications just the same as the desktop application. It mostly contains buttons, menus, and blocks on a single page and when a user clicks on them, it will dynamically rewrite the current page without loading any new pages from the server to faster its speed.

The Single Page Application (SPA) only sends the data that we need with user interactivity, and the browser renders that information accordingly. hence, the rendering behavior is different than a traditional page where the server re-renders a full page with every click when we make any request and sends it to our browser.

By following Single Page Application (SPA) approach, one can enhance the web application performance and the time of fulfilling user requests by not re-rendering the page unnecessarily.

How to update to Angular 8?

Angular is one of the major releases in the Angular Core framework, Angular Materials, and Angular CLI. Now, If we are using either Angular 5, 6, or 7 and want to update to Angular 8, then by adding the below command line, it will update your app to the recent version of Angular.

Ng update @angular/cli @angular/Core

What are the new features in Angular 8?

Some of the features of Angular 8 have come up in a way to make it more sturdy and attractive. The Angular community has released the Angular 8 version with a remarkable list of transformations and improvements including the much-awaited Ivy Compiler as an opt-in feature. The most prominent features of Angular 8 are given below:

The new Compiler of Angular 8 is Ivy Rendering Engine.
Angular 8 supports web-Workers.
Angular 8 Supports TypeScript 3.4
Angular 8 provides dynamic imports of lazy-loaded modules.
Improvement of ngUpgra

Preview of Ivy:

The Ivy project is rewriting the Angular Compiler and run-time code to make it better, smaller and faster.

What are the Components of Ivy:

Tree Shakable:

It is mainly eliminating the useless pieces of the code; the framework does not infer the component. The components can reference the instructions and if it does not reference appropriate guidance from the results, then it can go for faster load time.

Differential Loading:

The new app generated by CLI will now contain separate bundles which can be loaded automatically by the browser that render and load faster.

Low Memory Footprint:

The incremental DOM did not need any memory to render the view of the view does not change the DOM. So, it can allocate the memory when the DOM nodes will be added or removed. As most of the templates don’t change anything results in substantial memory savings.

Web Worker Bundling:

A web worker is integrated when the developer is building the production bundles that are important for improving the parallel ability and help to increase the performance.

Router Backward Compatibility:

Angular Team also added the backward compatibility mode to Angular Router which helps to create the way for any big projects and make everything easier to move to Angular with lazy loading.

Bazel Support:

Bazel is mainly for precisely, reproducible builds but will be a lot faster & it would be beneficial if your app uses several libraries and modules. The Angular framework is built with Bazel and is also expected to be included in the @angular/cli of version 9.

Opt-In Usage Sharing:

Opt-in usage sharing telemetry is mainly working on collecting data commands which are being used and building the speed if users will allow them so that it can help the developers to improve in the future.

Lazy Loading:

Lazy Loading is based on Angular routing concepts and it will help the developers to bring down the size of the large files by lazily loading the data which are required.

Web Workers Class:

JavaScript is single-threaded. Thus, it is very common to do more critical tasks like data calls to take place asynchronously. Web Workers mainly facilitate you to run the CPU-intensive computations in the background thread after freeing the main thread to update the user interface. Web Workers may also be helpful if your application is unresponsive while processing the main data. Now, if you want to outsource any calculation to the background, we must first create the web worker by using the Angular CLI.

ng generate worker n-queens

TypeScript 3.4

Angular 8 supports TypeScript 3.4 which is needed to run the Angular to run your Angular 8 project. So, it is necessary to upgrade your TypeScript version to 3.4 in Angular 8.

What is TypeScript

As we can understand from the above that Angular 8 and its previous version are heavily dependent on TypeScript Language. So, it is always important to know some basic concepts of TypeScript. TypeScript is mainly a superset scripting language of JavaScript. According to Google, the definition of TypeScript is that it is a free and open-source programming language that has been developed and maintained by Microsoft. It adds optional static typing to the language.

TypeScript mainly gives the facility and more privilege relate to declarative programming like classes, interfaces static typing, modules over the famous JavaScript library, and code to the developers. TypeScript is actually acted as a transpiler. However, a developer can develop and compile the code in TypeScript. The code written in TypeSript has been converted into another language like JavaScript after compilation and JavaScript-based code is then run in the browser for the application. So, transpiler is mainly converting one language into another.

Lazy Loaded Module:

Angular 8 facilitates you to use the standard dynamic import syntax instead of custom string for lazy loaded modules. The lazy-loaded import that looked like before in the below way -

{ path: ‘/student’, loadChildren: ‘/student /student.module#StudentModule’ }

It will Look like this:

{ path: ‘/student’, loadChildren: () => import(‘ . /student /student.module’).then (s=>s.StudentModule)}>

How to create a new project by using Angular CLI:

If you want to create a new project on Angular 8, then we can use Angular CLI commands for this. So, to create a new project with the help of the Angular CLI, we have to perform the below steps:

We have to open the Command Prompt and create a new folder.

Now, we have to run the command –ng new Angulardemo

Write “N” for when you would like to Add Angular Routing Options (or can write “Y” when we want to use Routing in our applications.)

After that, select Stylesheet Style as CSS and then press enter.

After the command, Angular CLI will create the required files for running the Angular projects with the related packages that need to be downloaded in the node modules folder.

CLI Workflow Improvements:

The Angular CLI is constantly getting better and now the ng-build, ng-run, and ng-test are equipped to be extended by 3rd party libraries and tools.

Builders API:

The new version of CLI will allow us to use builders API. It uses builders for mail operations like Build, Serve, Test, e2e and link and after that, we can create our custom builders as well.

Service Worker:

It helps us to increase the reliability and performance without any requirement of code against low-level APIs and can achieve native-like application installation and download.

Improvements in $Location Service:

$Location Service helps you to retrieve the state from location service, track all the necessary changes and retrieve protocol port search properties.

The architecture of Angular 8:

Angular 8 integrates core functionality as a set of TypeScript libraries that can be introduced in our application. NgModules are the essential building blocks of the Angular 8 application. They are able to provide a compilation context for the components. Angular 8 always has at least a root module that enables bootstrapping. Components define views that are the set of the screen element and modified according to your necessary program logic and data in Angular 8. The important parts of the Angular 8 Architecture are as follows:

Modules
Templates
Components
Data-Binding
Services
Metadata
Directives
Dependency Injection

Modules

Angular 8 NgModules are different from any other JavaScript modules. Every Angular 8 app can provide the bootstrap mechanism to launch the application. Every Angular 8 can contain so many other functional modules. Some features of Angular 8 Modules are:

NgModules allow the functionality to be imported and used by other modules like for example if you want to use the route service in the app, you need to import the Route Ng Module.
NgModules import the functionality from other NgModules like other JavaScript modules.

Templates

The Angular Template incorporates the HTML with Angular mark-up that can modify the HTML elements before they are going to be displayed. It is providing the program logic and binding the mark-up connects to the application data and the DOM. The code will look like the below:

<div style=“text-align: center”>
<h1>
{{2| power: 5}}
</h1>
</div>

In the above mentioned HTML file, we are using a template and used pipe inside the template to covert the values to its desired output.

Root Component {} Root Template

Child A Component Child B Component

Child A Template Child B Template

Grand Child Template

Components

Every angular project must have at least one component which is known as the root component and the root components connect the component with the Page document Object Module (DOM). Each of the components defines a class that mainly contains data, logic, application and it is binding with the HTML template.

Data Binding

Angular will make the communication between a component and a DOM to make it easy to define an interactive application without pulling and pushing the data. The two different types of data binding are:

Property Binding: It can interpolate the values which are computed from application data into the HTML.
Event Binding: Our app is responding to the user input in the target environment by updating the application data.

Services

Services are being used to reuse the code. Services have been created for the code which is the standard one for more than one component. The decorator is mainly providing the meta-data which will allow the services to be injected into the client component as a dependency. Angular 8 then differentiates an element from a service to increase the reusability and modularity.

Meta-data

Decorators are working as the metadata in Angular. It is mainly used to enhance the class so that it can configure the expected behavior of the class. Users are able to use Metadata in a class to let the Angular app know that the app component is a component. Metadata can also be attached to TypeScript with the help of the decorator.

Directives

Directives are mainly used to expand the working functionality of HTML elements. There are three types of directives available in Angular – Attribute directives, Structural directives, and Component directives.

Apart from the in-built directive, one can create our directive, and the way is to create a JavaScript class and apply the @Directive attribute along with that class. we can write the desired behavior in the class as per our business requirements.

Dependency Injection (DI)

It is wired into Angular through an Angular Framework and can be used everywhere to provide a new component with new services. It is mainly a design pattern for modularity and efficiency. Dependency Injection will not fetch the data from a server, log directly to the console or validate the user input; in fact, they will hand over such work to the Services.

A dependency injector creates the dependencies using providers and the providers are recipes that know how to create dependencies based on the given instructions. Type annotations in TypeScript can be used to ask for the dependencies and Every component has its injector, resulting in an injector tree and the injector tree enabling transient dependencies respectively.

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