How to use Form Builder in Angular Application?

Hello to all, welcome to therichpost.com. In this post, I will tell you, How to use Form Builder in Angular Application?

The FormBuilder provides syntactic sugar that shortens creating instances of a FormControl, FormGroup, or FormArray. It reduces the amount of boilerplate needed to build complex forms.

Guys with this we will cover below things:

1. Angular 13 Reactive Form Implelemtnation.
2. Reactive forms validation email with valid format.
3. Angular13 Reactive Form Responsiveness with Bootstrap 5.

Angular13 came and if you are new then you must check below link:

1. Angular 13 Tutorials

Here is the code snippet and please use carefully:

1. Very first guys, here are common basics steps to add angular 13 application on your machine and also we must have latest nodejs version(14.17.0) installed for angular 13:

npm install -g @angular/cli

ng new angularform // Set Angular 13 Application on your pc

cd angularform // Go inside project folder

2. Now run below commands to set bootstrap 5 modules into our angular 13 application for responsiveness (optional):

npm install bootstrap

npm i @popperjs/core

3. Now friends we just need to add below code into angularform/angular.json file (optional):

"styles": [
              ...
              "node_modules/bootstrap/dist/css/bootstrap.min.css"
          ],
"scripts": [
              ...
               "node_modules/bootstrap/dist/js/bootstrap.min.js"
           ]

4. Now guys we will add below code into our angularform/src/app/app.module.ts file:

...
import { ReactiveFormsModule } from '@angular/forms';

@NgModule({
...
  imports: [
   ...
    ReactiveFormsModule,
   
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

5. Now guys we will add below code into our angularform/src/app/app.component.ts file:

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  
  //Form Validables 

registerForm:any = FormGroup;
submitted = false;
constructor( private formBuilder: FormBuilder){}
//Add user form actions
get f() { return this.registerForm.controls; }
onSubmit() {
  
  this.submitted = true;
  // stop here if form is invalid
  if (this.registerForm.invalid) {
      return;
  }
  //True if all the fields are filled
  if(this.submitted)
  {
    alert("Great!!");
  }
 
}
  ngOnInit() {
    //Add User form validations
    this.registerForm = this.formBuilder.group({
    email: ['', [Validators.required, Validators.email]],
    password: ['', [Validators.required]]
    });
  }
}

6. Finally we will add below code into our angularform/src/app/app.component.html file:

<div class="container py-5">
  <div class="row">
    
    <div class="col-md-8 col-lg-8">
     
              <h3 class="login-heading mb-4">Welcome back!</h3>

              <!-- Sign In Form -->
              <form [formGroup]="registerForm" (ngSubmit)="onSubmit()">
                <div class="form-floating mb-3">
                  <input type="email" class="form-control" id="floatingInput" placeholder="name@example.com" formControlName="email" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.email.errors }"  id="inputEmail4">
                  <div *ngIf="submitted && f.email.errors" class="invalid-feedback">
                    <div *ngIf="f.email.errors.required">Email is required</div>
                    <div *ngIf="f.email.errors.email">Email must be a valid email address</div>
                 </div>
                  <label for="floatingInput">Email address</label>
                </div>
                <div class="form-floating mb-3">
                  <input type="password" class="form-control" id="floatingPassword" placeholder="Password" formControlName="password"[ngClass]="{ 'is-invalid': submitted && f.password.errors }" id="inputPassword4">
                  <div *ngIf="submitted && f.password.errors" class="invalid-feedback">
                    <div *ngIf="f.password.errors.required">Password is required</div>
                 </div>
                  <label for="floatingPassword">Password</label>
                </div>

                <div class="form-check mb-3">
                  <input class="form-check-input" type="checkbox" value="" id="rememberPasswordCheck">
                  <label class="form-check-label" for="rememberPasswordCheck">
                    Remember password
                  </label>
                </div>

                <div class="d-grid">
                  <button class="btn btn-lg btn-primary btn-login text-uppercase fw-bold mb-2" type="submit">Sign in</button>
                  <div class="text-center">
                    <a class="small" href="#">Forgot password?</a>
                  </div>
                </div>

              </form>
            </div>
            <div class=" col-md-6 col-lg-4">
              <h3>Form Status</h3>
            <b>valid : </b>{{registerForm.valid}}
            <b>invalid : </b>{{registerForm.invalid}}
            <b>touched : </b>{{registerForm.touched}}
            <b>untouched : </b>{{registerForm.untouched}}
            <b>pristine : </b>{{registerForm.pristine}}
            <b>dirty : </b>{{registerForm.dirty}}
            <b>disabled : </b>{{registerForm.disabled}}
            <b>enabled : </b>{{registerForm.enabled}}
           
            <h3>Form Value</h3>
            {{registerForm.value |json}}
            </div>
          </div>
        </div>
     

Now we are done friends and please run ng serve command to check the output in browser(locahost:4200) and if you have any kind of query then please do comment below.

Note: Friends, I just tell the basic setup and things, you can change the code according to your requirements. For better understanding please watch video above.

Guys I will appreciate that if you will tell your views for this post. Nothing matters if your views will be good or bad.

Jassa

Thanks