How to iterate over FormArray in FormGroup in an Angular reactive Form

The Structure of my form is as shown below

-MainForm(ParentForm)
 -FormGroup(MedicineGroup)
  -FormArray(MedicineArray)

I wanted to iterate MedicineArray for which, i did some research and wrote the below code

for (let control of soForm.get('MedicineGroup').controls['MedicineArray'].controls) {
    medObj.name.push(control.controls['MedName'].value);
  }

The code is working fine but i am getting a warning, which says

Property 'controls' does not exist on type 'AbstractControl'.

Is there any other or better way to iterate a FormArray which is inside a FormGroup?

#javascript #angular #typescript

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Angular 11 Reactive Forms Validation Tutorial

Reactive form validation in Angular 11 app. In this tutorial, i will show you how to use reactive form validation in angular 11 app.

As well as, and you will learn how use reactive form validation in angular 11. And also use reactive form with formGroup for validation in angular 11 app.

Reactive Form Validation In Angular 11
Step 1 – Create New Angular App
Step 2 – Import Form Module
Step 3 – Add Code on View File
Step 4 – Use Component ts File
Step 5 – Start Angular App

https://www.tutsmake.com/angular-11-reactive-forms-validation-tutorial-example/

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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.

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Angular 8 Forms | Angular Reactive and Template Forms

Angular Forms are used to handle the user’s input. We can use Angular form in our application to enable users to log in, update profiles, enter information, and to perform many other data-entry tasks.

If you are new to Angular, then check out myAngular Tutorial. If you do not know how to upgrade to Angular 8 via Angular CLI, then check out my Angular Upgrade tutorial. Managing user input with forms is the cornerstone of many web applications.

The web app uses forms to enable the users to log in, to update a profile, to enter sensitive information, and to perform many data-entry tasks.

#angular #angular 8 #angular reactive

Wondering how to upgrade your skills in the pandemic? Here's a simple way you can do it.

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And for the technology-loving people like us, Knoldus Techhub has already helped us a lot in doing it in a short span of time!

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“No time is better than the present”

– Georgia Byng, a British children’s writer, illustrator, actress and film producer.

No matter if you are a developer (be it front-end or back-end) or a data scientist, tester, or a DevOps person, or, a learner who has a keen interest in technology, Knoldus Techhub has brought it all for you under one common roof.

From technologies like Scala, spark, elastic-search to angular, go, machine learning, it has a total of 20 technologies with some recently added ones i.e. DAML, test automation, snowflake, and ionic.

How to upgrade your skills?

Every technology in Tech-hub has n number of templates. Once you click on any specific technology you’ll be able to see all the templates of that technology. Since these templates are downloadable, you need to provide your email to get the template downloadable link in your mail.

These templates helps you learn the practical implementation of a topic with so much of ease. Using these templates you can learn and kick-start your development in no time.

Apart from your learning, there are some out of the box templates, that can help provide the solution to your business problem that has all the basic dependencies/ implementations already plugged in. Tech hub names these templates as xlr8rs (pronounced as accelerators).

xlr8rs make your development real fast by just adding your core business logic to the template.

If you are looking for a template that’s not available, you can also request a template may be for learning or requesting for a solution to your business problem and tech-hub will connect with you to provide you the solution. Isn’t this helpful 🙂

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Angular + Reactive Forms - Required Checkbox Example

This is a quick example of how to implement a required checkbox field in Angular with Reactive Forms. For a more detailed registration form example that includes a bunch of other fields see Angular 10 - Reactive Forms Validation Example.

Here it is in action:

(See on StackBlitz at https://stackblitz.com/edit/angular-reactive-forms-required-checkbox)

Angular Required Checkbox App Component

The app component contains an example form (FormGroup) which contains a single boolean field with a requiredTrue validator to make a checkbox field required. The app component uses a FormBuilder to create an instance of a FormGroup that is stored in the form property. The form property is then bound to the <form> element of the app template below using the [formGroup] directive.

The component contains a convenience getter property f to make it easier to access form controls from the template. So for example you can access the confirmPassword field in the template using f.confirmPassword instead of registerForm.controls.confirmPassword.

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';

@Component({ selector: 'app', templateUrl: 'app.component.html' })
export class AppComponent implements OnInit {
    form: FormGroup;
    submitted = false;

    constructor(private formBuilder: FormBuilder) { }

    ngOnInit() {
        this.form = this.formBuilder.group({
            acceptTerms: [false, Validators.requiredTrue]
        });
    }

    // convenience getter for easy access to form fields
    get f() { return this.form.controls; }

    onSubmit() {
        this.submitted = true;

        // stop here if form is invalid
        if (this.form.invalid) {
            return;
        }

        // display form values on success
        alert('SUCCESS!! :-)\n\n' + JSON.stringify(this.form.value, null, 4));
    }

    onReset() {
        this.submitted = false;
        this.form.reset();
    }
}

App Component Template

The app component template contains the html markup for displaying the example required checkbox form in the browser. The form element uses the [formGroup] directive to bind to the form FormGroup in the app component above.

The form binds the form submit event to the onSubmit() handler in the app component using the Angular event binding (ngSubmit)="onSubmit()". Validation messages are displayed only after the user attempts to submit the form for the first time, this is controlled with the submitted property of the app component.

The reset button click event is bound to the onReset() handler in the app component using the Angular event binding (click)="onReset()".

#angular #reactive forms #required checkbox #component #formgroup