Angular Tutorial For Beginners

Angular Tutorial For Beginners

Angular Tutorial For Beginners

Emmanuel Ighosewe
Author
Emmanuel Ighosewe

What is Angular

Angular is a platform for creating a one-page application for mobile and desktop devices. The development platform utilizes HTML to create applications. The Angular itself is written using Typescript. Now it has all the features you need to create an excellent web or mobile app. It has functions such as components, instructions, forms, pipelines, HTTP services, dependency injection, etc.

Typescript belongs to JavaScript; therefore, it is important that you have a proper understanding of JavaScript. JavaScript operates using the website client-side and is used to design or program the behavior of the web page in an event occurrence. JavaScript is generally utilized for interface interactions, slideshows, and other interactive components. JavaScript evolved quickly and was also used for server programming (like Node.js), game development, etc.

JavaScript handles dynamic content, an essential part of web development. Dynamic content refers to content that constantly changes and adapts to users specifically.

Prerequisites

Before you start with this Angular tutorial, you must have a basic understanding of HTML, CSS, and JavaScript. In this Angular tutorial, we will discuss all the basic concepts in Angular that can get you started.

Set up your environment

Install NodeJS and npm

Node.js and npm are the basis for modern website development using Angular and other platforms. Node supports the development and builds tools. We will install all JavaScript library dependencies using Node Package Manager (npm).

The Angular CLI

The Angular command-line interface tool (CLI) is mainly used to build and develop Angular applications, which can be used to create projects, add files, and perform various ongoing development tasks, like testing, bundling, and deployment.

The angular CLI is responsible for configuring and initiating the different libraries. It can help us add components, instructions, services, etc., with existing angular applications. It is also worth noting that CLI uses Typescript and Webpack for bundling modules, Karma for unit testing, and Protractor for end-to-end testing. It has everything you need to write angular applications immediately.

Features of Angular

Progressive web apps: It utilizes the modern features of the web platform to provide an app-like experience. It provides a powerful, zero-stage offline installation. Therefore, using Angular is very easy.

Native: You can use strategies that utilize Ionic Framework, NativeScript, and React Native to build native mobile apps.

Desktop: Using Angular, you can create desktop applications for Mac, Windows, and Linux.

Code generation: Angular converts your templates into highly optimized code for JavaScript virtual machines and offers all the advantages of handwritten code and framework productivity.

Universal: Using Angular, you can utilize any technology to deploy the application, such as node.js, .NET, PHP, and other servers.

Angular Apps Architecture

Angular is a framework for creating single-page applications (SPAs). So, the architecture is designed to do this effectively. SPAs – Single-page applications are applications that can be accessed through a web browser (similar to other websites) but offer additional dynamic interactions with native mobile and desktop applications. The most obvious difference between a standard website and a SPA is the reduction in the number of page updates.

Generally, 95% of SPA code is executed in the browser. When users need new data or need to perform security operations (such as authentication), the rest of the activity occurs on the server. Due to this, the page rendering process is primarily done on the client-side.

Angular Building Blocks: Templates

These templates are used for defining component views. The template looks like normal HTML, but there are some differences. Codes such as * ngFor, {{hero.name}}, (click), and [hero] use angular template syntax to improve HTML markup functionality. The template can contain custom components in the form of irregular HTML tags, such as <custom-element>. These components integrate seamlessly with native HTML in a similar layout.

Angular Libraries

Angular gives us a collection of JavaScript modules (library modules) that provide various functionalities. Each Angular library has @angular prefix, like @angular/core, @angular/compiler, @angular/compiler-cli, @angular/http, @angular/router. You can install them using the npm package manager and import parts of them with JavaScript import statements.

Angular provides the different collection of library modules which gives different functionalities. The Angular library feature include;

  • @angular prefix
  • @angular/core
  • @angular/compiler
  • @angular/compiler-cli
  • @angular/http
  • @angular/router

Components

This component is the main element of the angular application. The component includes how the view is being defined and the data that define the appearance and behavior of the view. Angular components are simple Javascript classes with @component Decorator. The decorator offers visualization components to display metadata about the class.

This component uses a process called data binding to transfer data for display. To do this, link the DOM elements to the component attributes. Binding can be used for displaying user component class attribute values, change item styles, respond to user events, and more.

Angular Forms

The Data entry form can either be simple or highly complicated. Forms have a large number of input fields, a large number of fields, for example, Text fields, dates, numbers, emails, passwords, checkboxes, Option boxes, etc. These fields can contain multiple tabs or pages. Forms can also have complex validation logic based on multiple fields.

Angular forms have been designed for each of the above and others. Now, it uses a reactive form approach for developing forms. An older Template approach has also been adopted.

Services & Dependency Injection

With the help of services, we can develop reusable code and use it in all the necessary components. Services can be injected into other components and services using Dependency Injection. Module dependencies are determined based on the vendor metadata. The Angular creates a tree of injectors and suppliers similar to the Component Tree. This is known as a hierarchical pattern.

HTTP

With the help of the newly developed HttpClient module, we can query the remote API source in the application to input data into it. This requires us to subscribe to the response with an observable RxJ.

Angular Router

The router module controls the navigation and routing in Angular. You can use routing to navigate from one section of the application to another or from one view to another.




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