‘Dumb’ Angular — Input Setter/Getter vs NgOnChanges

How Components Interact in Angular

Angular components have multiple ways to share information with other parts of the application. Developing a complex Angular app will involve a lot of data, and subsequently a lot of interaction between components.

Once you learn the methods that are used to handle data in components, it becomes easy to replicate for different use cases.

However, there are three main ways to intercept data changes and it’s easy to assume that all methods are equal. In simple circumstances, such as when you just need to listen to the updated value, they can act pretty similar.

But there are circumstances where each method has superiority over the other in terms of their suitability to the task at hand.

The methods used are:

• @Input Setter and Getters
• NgOnChanges
• A Service

As the title suggests, we’ll be focusing on the **first two, **where we will go over their individual suitability for different circumstances in Angular.

Dumb components in Angular

If you haven’t heard of a Dumb Component in Angular… you might think I’m insulting Angular or its components. I’m not…

The idea of a Dumb component in Angular is to create** components that act like pure functions**. Meaning, their internal state, and behavior are controlled by their inputs and outputs only. There are no side effects and external data sources like services, APIs, or local storage.

Dumb components are usually minimalistic UI/presentational containers for our applications, where size and complexity are considered, and reduced as much as possible.

#typescript #javascript #programming #angular #software-engineering

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Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

1. Installing Node.js and npm
2. Installing Angular CLI
3. Creating workspace
4. Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

• Node.js
• npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

1. npm -v

Installing Angular CLI

• Open Terminal/Command Prompt
• To install Angular CLI, run the below command:

1. npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

1. ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

• Using CLI
• Using Visual Studio Code

1. Using CLI

To create a workspace:

• Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
• Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

1. Ng new YourAppName

• After running this command, it will prompt you to select from various options about the CSS and other functionalities.

• To leave everything to default, simply press the Enter or the Return key.

#angular tutorials #angular cli install #angular environment setup #angular version check #download angular #install angular #install angular cli

‘Dumb’ Angular — Input Setter/Getter vs NgOnChanges

How Components Interact in Angular

Angular components have multiple ways to share information with other parts of the application. Developing a complex Angular app will involve a lot of data, and subsequently a lot of interaction between components.

Once you learn the methods that are used to handle data in components, it becomes easy to replicate for different use cases.

However, there are three main ways to intercept data changes and it’s easy to assume that all methods are equal. In simple circumstances, such as when you just need to listen to the updated value, they can act pretty similar.

But there are circumstances where each method has superiority over the other in terms of their suitability to the task at hand.

The methods used are:

• @Input Setter and Getters
• NgOnChanges
• A Service

As the title suggests, we’ll be focusing on the **first two, **where we will go over their individual suitability for different circumstances in Angular.

Dumb components in Angular

If you haven’t heard of a Dumb Component in Angular… you might think I’m insulting Angular or its components. I’m not…

The idea of a Dumb component in Angular is to create** components that act like pure functions**. Meaning, their internal state, and behavior are controlled by their inputs and outputs only. There are no side effects and external data sources like services, APIs, or local storage.

Dumb components are usually minimalistic UI/presentational containers for our applications, where size and complexity are considered, and reduced as much as possible.

#typescript #javascript #programming #angular #software-engineering

Basics of Angular: Part-1

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.

Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.

We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.

What is a Component in Angular?

Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})

Role of App Module

Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.

@NgModule({
declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  HttpClientModule,
  AppRoutingModule,
  FormsModule
],
bootstrap: [AppComponent]
})

What is Data Binding?

Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:

• When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
• When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
• When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.

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Angular Input Output: Angular 9 @Input and @Output

Angular Framework is built upon small components so passing the data from Parent component to child component is a little bit tricky, In that scenario, @Input and @Output Decorator comes in handy.  You can define the properties for components you create, and make them available in your whole application.

Angular components have a better way of notifying parent components that something has changed via events. Inputs specify which properties you can set on a component from a parent, whereas “Outputs” identifies the events a component can fire to send information up the hierarchy to its parent from its child component.

#angular #angular cli #inputs #outputs