Macess Hulk

Macess Hulk

1567744349

Manage reactive form controls with form groups in Angular 8

Why are reactive forms important?

With reactive forms, you will discover that it is easier to build cleaner forms. Because every JavaScript framework advises that you don’t make the template clustered, this has become a priority as the form logic now lies in the component class.

It also reduces the need to use a lot of directives and even end-to-end testing since you can now easily test your forms. It gives the developer all the control, and nothing is implicit anymore — every choice about inputs and controls must be made intentionally and, of course, explicitly.

In Angular, form controls are classes that can hold both the data values and the validation information of any form element. That is to say, every form input you have in a reactive form should be bound by a form control.

These are the basic units that make up reactive forms. In this article, you will be shown how form controls can be divided by form groups to create clusters to provide a platform to easily access the template element as groups.

What is a form group?

Form groups wrap a collection of form controls; just as the control gives you access to the state of an element, the group gives the same access but to the state of the wrapped controls. Every single form control in the form group is identified by name when initializing.

A FormGroup aggregates the values of each child FormControl into one object, with each control name as the key. It calculates its status by reducing the status values of its children.

Before you start…

To be able to follow through this article’s demonstration, you should have:

// run the command in a terminal
ng version

Confirm that you are using version 8, and update to 8 if you are not.

  • Download the Augury Chrome extension here.
  • Download this tutorial’s starter project here to follow through the demonstrations.
  • Unzip the project and initialize the Node modules in your terminal with this command:
npm install

Other things that would be nice to have are:

  • A working knowledge of the Angular framework at a beginner level
  • Familiarity with form controls in Angular will be a plus but not a requirement

Demo

To illustrate the concept of form groups, we will go through the process of building a reactive form so that you can fully grasp how to set it up with form groups. From here, we assume you have downloaded the starter project on GitHub and opened it in VS Code.

Registering form groups

The first thing to do is to tell Angular that you want to make use of the form group by importing it inside the appropriate component. Navigate to the employee.component.ts file and copy in the code block below:

import { Component, OnInit } from '@angular/core';
import { FormControl, FormGroup } from '@angular/forms'
@Component({
  selector: 'app-employee',
  templateUrl: './employee.component.html',
  styleUrls: ['./employee.component.css']
})
export class EmployeeComponent implements OnInit {
  bioSection = new FormGroup({
    firstName: new FormControl(''),
    lastName: new FormControl(''),
    age: new FormControl('')
  });
constructor() { }
ngOnInit() {
  }
}

Here the form group was both imported and initialized to group together some form controls that compose the bio section of the form. To reflect this group, you have to associate the model to the view with the form group name, like this:

// copy inside the employee.component.html file
<form [formGroup]="bioSection" (ngSubmit)="callingFunction()">

<label>

First Name:

<input type=“text” formControlName=“firstName”>

</label>

<label>

Last Name:

<input type=“text” formControlName=“lastName”>

</label>

<label>

Age:

<input type=“text” formControlName=“age”>

</label>

<button type=“submit”>Submit Application</button>

</form>

Just like the form control, the form group name is used to identify the form group in the view, and on submit, the callingFunction will be triggered. Your app.component.html file should look like this:

<div style=“text-align:center”>

<h2>Angular Job Board </h2>

<app-employee></app-employee>

</div>

Now run your application in development with the command:

ng serve

It should look like this:


Nesting form groups

Yes, the reactive forms API makes it possible to nest a form group inside another form group. Copy the code block below into the employee.component.ts file:

import { Component, OnInit } from ‘@angular/core’;

import { FormControl, FormGroup } from ‘@angular/forms’

@Component({

selector: ‘app-employee’,

templateUrl: ‘./employee.component.html’,

styleUrls: [‘./employee.component.css’]

})

export class EmployeeComponent implements OnInit {

bioSection = new FormGroup({

firstName: new FormControl(‘’),

lastName: new FormControl(‘’),

age: new FormControl(‘’),

stackDetails: new FormGroup({

stack: new FormControl(‘’),

experience: new FormControl(‘’)

}),

address: new FormGroup({

country: new FormControl(‘’),

city: new FormControl(‘’)

})

});

constructor() { }

ngOnInit() {

}

callingFunction() {

console.log(this.bioSection.value);

}

}

Here you see that the main form group wrapper is the bio section inside which both the stack details group and the address group is nested. It is important to note — as you see in the code block — that nested form groups are not defined by the assignment statement, but rather with the colon, just like you will a form control. Reflecting this in the view will look like this:

// copy inside the employee.component.html file

<form [formGroup]=“bioSection” (ngSubmit)=“callingFunction()”>

<h3>Bio Details

</h3>


<label>

First Name:

<input type=“text” formControlName=“firstName”>

</label> <br>

<label>

Last Name:

<input type=“text” formControlName=“lastName”>

</label> <br>

<label>

Age:

<input type=“text” formControlName=“age”>

</label>

<div formGroupName=“stackDetails”>

<h3>Stack Details</h3>


&lt;label&gt;
  Stack:
  &lt;input type="text" formControlName="stack"&gt;
&lt;/label&gt; &lt;br&gt;

&lt;label&gt;
  Experience:
  &lt;input type="text" formControlName="experience"&gt;
&lt;/label&gt;



</div>

<div formGroupName=“address”>

<h3>Address</h3>


&lt;label&gt;
  Country:
  &lt;input type="text" formControlName="country"&gt;
&lt;/label&gt; &lt;br&gt;

&lt;label&gt;
  City:
  &lt;input type="text" formControlName="city"&gt;
&lt;/label&gt;



</div>

<button type=“submit”>Submit Application</button>

</form>

It is very important that every name in the model and the view match — you do not misspell the form control names! When you save and run the application, if you do get any errors, read the error message and correct the misspelling you must have used. You can style your component with the style instructions below:

input[type=text] {

width: 30%;

padding: 8px 14px;

margin: 2px;

box-sizing: border-box;

}

button {

font-size: 12px;

margin: 2px;

padding: 8px 14px;

}

If you run the application, you should see something like this in your browser:



When you use the form and submit, you will see your input results returned in the browser console. The complete code to this tutorial can be found here on GitHub.

Conclusion

In addition to learning about form controls, you have now been introduced to the important concept of grouping these controls. You were also shown why grouping them is very important, as it ensures that their collective instances can be captured at once. The next concept we will be looking at is form builders.

Thanks for reading. If you liked this post, share it with all of your programming buddies!

Further reading

☞ Best 50 Angular Interview Questions for Frontend Developers in 2019

☞ To become an Outstanding AngularJs Developer - part 2

☞ To become an Outstanding AngularJs Developer - part 1

☞ To become an effective Angular developer, you need to learn 19 things in this article

☞ Top 18 Mistakes AngularJS Developers Makes

☞ AngularJS Directive with Example: ng-init, ng-app, ng-repeat, ng-model

☞ Angular 8 (formerly Angular 2) - The Complete Guide


Originally published on blog.logrocket.com

#angular #angular-js #javascript #web-development

What is GEEK

Buddha Community

Manage reactive form controls with form groups in Angular 8

Yogi Gurjar

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Laravel 8 Form Validation Tutorial

Laravel 8 form validation example. In this tutorial, i will show you how to submit form with validation in laravel 8.

And you will learn how to store form data in laravel 8. Also validate form data before store to db.

How to Validate Form Data in Laravel 8

  1. Step 1 – Install Laravel 8 Application
  2. Step 2 – Configuring Database using Env File
  3. Step 3 – Create Model & Migration File For Form
  4. Step 4 – Create Routes
  5. Step 5 – Creating Controller
  6. Step 6 – Create Blade File For Form
  7. Step 7 – Start Development Server
  8. Step 8 – Run Laravel 8 Form Validation App On Browser

https://laratutorials.com/laravel-8-form-validation-example-tutorial/

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Clara Gutmann

Clara Gutmann

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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

I am Developer

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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/

#reactive form validation in angular 11 #angular 11/10/9/8/7 reactive forms validation example #angular 11 form validation example

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Laravel 8 Form Example Tutorial - Complete Guide

Laravel 8 form example. In this tutorial, i would love to show you how to create form in laravel. And how to insert data into database using form in laravel 8.

How to Submit Form Data into Database in Laravel 8

  1. Step 1 – Install Laravel 8 Application
  2. Step 2 – Configuring Database using Env File
  3. Step 3 – Create Model & Migration File For Add Blog Post Form
  4. Step 4 – Create Routes
  5. Step 5 – Creating Controller
  6. Step 6 – Create Blade File For Add Blog Post Form
  7. Step 7 – Start Development Server
  8. Step 8 – Run Laravel 8 Form App On Browser

https://laratutorials.com/laravel-8-form-example-tutorial/

#insert form data into database using laravel #laravel bootstrap form #laravel post forms #laravel 8 form tutorial #laravel 8 form example #laravel 8 form submit tutorial

Roberta Ward

Roberta Ward

1595344320

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

Corona Virus Pandemic has brought the world to a standstill.

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Since most of the places are on lockdown, and you are working from home or have enough time to nourish your skills, then you should use this time wisely! We always complain that we want some ‘time’ to learn and upgrade our knowledge but don’t get it due to our ‘busy schedules’. So, now is the time to make a ‘list of skills’ and learn and upgrade your skills at home!

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!

If you are still not aware of it, don’t worry as Georgia Byng has well said,

“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 🙂

Confused with which technology to start with?

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If you still feel like it isn’t helping you in learning and development, you can provide your feedback in the feedback section in the bottom right corner of the website.

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