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Tuesday, December 7, 2021
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Angular 11 – How to use reactive form part5? Recall Form Validation

Angular 11 - How to use reactive form part5? Recall Form Validation

Hello friends, welcome back to my blog. Today in this blog posts, I am going to tell you, Angular 11 – How to use reactive form part5? Recall Form Validation

Angular Reactive Form

Angular 11 came and if you are new then you must check below link:

  1. Angular11 Basic Tutorials

Friends now I proceed onwards and here is the working code snippet for Angular 11 – How to use reactive form part5? Recall Form Validation and please use carefully this to avoid the mistakes:

1. Firstly friends we need fresh angular 11 setup and for this we need to run below commands but if you already have angular 11 setup then you can avoid below commands. Secondly we should also have latest node version installed on our system:

npm install -g @angular/cli 

ng new angularreactiveform //Create new Angular Project

cd angularreactiveform // Go inside the Angular Project Folder

ng serve --open // Run and Open the Angular Project

http://localhost:4200/ // Working Angular Project Url

 

2. Now friends, here we need to run below commands into our project terminal to install bootstrap(for good looks) module into our angular application:

npm install bootstrap --save

 

3. After done with commands add below code into your angular.json(file will be in project root folder) file:

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

 

4. Friends now we need to run again below command to run the project:

ng serve

 

5. Now friends we need to  add below code into your angularreactiveform/src/app/app.module.ts file:

...


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



@NgModule({
  ...
  imports: [
  ...
   
    ReactiveFormsModule,
   
  ],
  ...
export class AppModule { }

 

6. Now friends we need to  add below code into your angularreactiveform/src/app/app.component.ts file:

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


export class AppComponent {
...
  registerForm: FormGroup;
  submitted = false;
  constructor(private formBuilder: FormBuilder){}
  //Add user form actions
  get f() { return this.registerForm.controls; }
  onSubmit() {
    
    //Recall form validations

    this.registerForm.controls["firstname"].setValidators([Validators.required, Validators.minLength(6)]);
    this.registerForm.get('firstname').updateValueAndValidity();

    this.registerForm.controls["email"].setValidators([Validators.required, Validators.email]);
    this.registerForm.get('email').updateValueAndValidity();

    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("WOW!! You have been done with reactive form part.");

      //reset form fields
      this.registerForm.reset();
      this.registerForm.get('firstname').clearValidators();
      this.registerForm.get('firstname').updateValueAndValidity();
      this.registerForm.get('email').clearValidators();
      this.registerForm.get('email').updateValueAndValidity();
    }
   
  }
    ngOnInit() {
      //Add User form validations
      this.registerForm = this.formBuilder.group({
      email: ['', [Validators.required, Validators.email]],
     
      firstname: ['', [Validators.required, Validators.minLength(6)]]
      });
    }

}

 

7. Now friends we need to  add below code into your angularreactiveform/src/app/app.component.html file:

 <h1>therichpost.com</h1>
 <form [formGroup]="registerForm" (ngSubmit)="onSubmit()">
   <div class="row">
      <div class="col-sm-12">
         <div class="form-group">
               <label>Username</label>
               <input type="text" formControlName="firstname" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.firstname.errors }" />
               <div *ngIf="submitted && f.firstname.errors" class="invalid-feedback">
                     <div *ngIf="f.firstname.errors.required">Name is required</div>
                     <div *ngIf="f.firstname.errors.minlength">First Name must be at least 6 characters</div>
               </div>
            </div>
      </div> 
      <div class="col-sm-12">
         <div class="form-group">
            <label>Email</label>
            <input type="text" formControlName="email" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.email.errors }" />
            <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>
         </div>
      </div>
      
      
  </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

 

Now we are done friends 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 must watch video above.

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

Ajay Malhotra
the authorAjay Malhotra
Hello to all. Welcome to therichpost.com. Myself Ajay Malhotra and I am freelance full stack developer. I love coding. I know WordPress, Core php, Angularjs, Angular 2, Angular 6, Angular 7, Angular 8, Angular 9, Angular 10, Angular 11, Angular12, Angular 13, Bootstrap 5, Nodejs, Laravel, Codeigniter, Shopify, Squarespace, jQuery, Google Map Api, Vuejs, Reactjs, Big commerce etc.

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