Custom Angular Form Control

In this video, you will see how to create an #angular custom #form control that is compatible with Reactive Forms and Template Driven Forms.

To make a custom component behave like a Form Control, we should implement the ControlValueAccessor.

Code: https://github.com/profanis/codeShotsWithProfanis/tree/12/customFormControl

#angular #angular tutorial #what is angular

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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

Custom Angular Form Control

In this video, you will see how to create an #angular custom #form control that is compatible with Reactive Forms and Template Driven Forms.

To make a custom component behave like a Form Control, we should implement the ControlValueAccessor.

Code: https://github.com/profanis/codeShotsWithProfanis/tree/12/customFormControl

#angular #angular tutorial #what is angular

Angular Form Generator & Pitfalls

Ever felt repetitive creating forms in your Angular Application? Let’s fix it.

Intro

During the Front-end development days it feels like there is a lot of repetitive code which I have to write to design my forms which are almost all the time very close one to another.

I’ve been recently looking into ways of automating it. The furthest I wanted to go was to have some kind of interface between a more friendly modelling object as well as to an interface to link my objects to the Angular Modelling Universe.

This way, I discovered there is already a library that could do it for me formly. But looking over their documentation I realized this is a little bit more than I wanted.

As a result, I ended writing my own form generator. You’ll see that except for two or three pitfalls this is rather easy to achieve.

Foreground

I’ll be using Angular Materials to generate my forms.

I have two tips to share about their design. It can be difficult to change the colors or design a theme for them. You’ll see the documentation on their side is rather not the best on this subject. My piece of advice, use  https://materialtheme.arcsine.dev/. In case you don’t know exactly what colors to use but you have a slight idea about it, I recommend using  https://www.cssportal.com/css-color-converter/0000D8. In the end you’ll definitely discover some very cool Angular Material Theme which you can even share with others.

Getting Started

First of all, we’ll organize our application on modules. When it comes to Angular I always split the code in presentation and business. From where I’m standing, presentation means those components that deal with UX functionality, they can work by themselves but they don’t make sense for a user taken alone; business are those components that configure and group together presentation through a context.

#angular-forms #angular #typescript #angular-formly

Create a custom form control component in Angular with Control Value Accessor

One of the reasons I love angular so much is the out of the box features it comes with. Angular provides almost everything out of the boxthat you need to set up a typical web application. Angular team also provides the material library with helpful components that are well tested and ready to use. There is so much convenience that as an angular developer, we enjoy. That’s great!

**But, our applications are not always typical! **We might need to implement very complex behaviour inside our applications to meet the business logic.

This process of meeting business logic sometimes may include having a custom built form control. For example, you may need to create a fancy looking custom search component that you need to reuse throughout the application. On a different application, you may need a quiz component, that can be wired up with form control to facilitate reusability and extensibility. Something like this, maybe👇

Quiz component

This above component is what we have on focus today!

How would you build it?

The naive way to go about it is to not use a custom component at all. We can repeat code needed to build it and use *ngFor to loop through and use ngModel or formControl with it. That can give you a working code. But, what if you want to reuse this else where on you application? yes, you will have to repeat the code. We all know repeating code is not the way to do it, is it?

A better initial thought of mine was to create a custom component, call it quiz.component.ts, add an event listener to the component using@``[Output](https://angular.io/api/core/Output)``,listen for the event on parent and manually change the answer on parent component.

That could work. But hey, what if I want to bind it using [[(ngModel)]](https://angular.io/api/forms/NgModel)? or what if I want to use it with [formControl](https://angular.io/api/forms/FormControl)``?

That seems not straight forward, doesn’t it?

But fortunately, there is a convenient way angular provides to do this.

Let’s see how!

#angular #forms #javascript #angularjs #javascript-tips #control value accessor

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”.

#angular #javascript #tech blogs #user interface (ui) #angular #angular fundamentals #angular tutorial #basics of angular