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

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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

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

Never Again Be Confused When Implementing ControlValueAccessor in Angular Forms

If you’re working on a complex project inevitably you will face the situation when you have to create a custom form control. The essential component of this task will be implementing ControlValueAccessor. There are some articles on the web that explain how to implement it but none provides an insight into what role this component plays in the Angular forms architecture. If you want to know not only how to implement it but also why this article is for you.

Here I’ll first explain why we need ControlValueAccessor and how it’s used inside Angular. Then I’ll demonstrate how to wrap a 3rd party widget into an Angular component and setup communication with a parent component using the standard input/output mechanism. And finally I’ll show how to implement ControlValueAccessor that introduces a new communication mechanism specifically for Angular forms.

#angular #angular-forms #control-value-accessor

Form Builder | Create Online Forms Free | Fynzo Survey

Create professional forms for registrations, collecting contact details, or simply receiving feedback. Fynzo’s form builder is cost effective, easy to use, 100% secure with amazing personalization features and can integrate with all your favourite tools.

For more info visit: https://www.fynzo.com/survey/lp/form-builder

#form builder #online form builder #create online forms free #create professional forms

Creating a Custom Validation Message Component for Blazor Forms

In this post, I show a limitation with the built-in ValidationMessage component, the inability to customise it’s output. I then show two solutions to resolve this problem.

#forms #blazor #blazor (webassembly) #blazor (server) #custom #creating