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Angular6Bootstrap 4

Angular6 Form Validation Example

Angular6 Form Validation Example - The Rich Post

Hello to all, welcome to therichpost.com. In this post, I will tell you, Angular 6  Form Validation.

Forms are the very important part of every application and without form validations forms are useless or create insecurities for application.

Here are working form validations picture:

angular6-form-validation

Here are the following easy steps need to do for Angular 6 Form Validations:

1. First, you need to add below code into your app.module.ts file:
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { ReactiveFormsModule } from '@angular/forms';
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
  BrowserAnimationsModule,
  ReactiveFormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }
 2. After that, you need to add below code into your app.component.ts file:
import {Component} from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'my-angular-app';
  registerForm: FormGroup;
    submitted = false;

    constructor(private formBuilder: FormBuilder) { }

    ngOnInit() {
        this.registerForm = this.formBuilder.group({
            firstName: ['', Validators.required],
            lastName: ['', Validators.required],
            email: ['', [Validators.required, Validators.email]],
            password: ['', [Validators.required, Validators.minLength(6)]]
        });
    }

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

    onSubmit() {
        this.submitted = true;

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

        alert('SUCCESS!! :-)\n\n' + JSON.stringify(this.registerForm.value))
    }
  
}
 3. Finally, need to add below code into app.component.html file:
<div class="jumbotron">
    <div class="container">
        <div class="row">
            <div class="col-md-6 offset-md-3">
                <h3> Welcome to {{ title }}!</h3>
                <form [formGroup]="registerForm" (ngSubmit)="onSubmit()">
                    <div class="form-group">
                        <label>First Name</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">First Name is required</div>
                        </div>
                    </div>
                    <div class="form-group">
                        <label>Last Name</label>
                        <input type="text" formControlName="lastName" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.lastName.errors }" />
                        <div *ngIf="submitted && f.lastName.errors" class="invalid-feedback">
                            <div *ngIf="f.lastName.errors.required">Last Name is required</div>
                        </div>
                    </div>
                    <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 class="form-group">
                        <label>Password</label>
                        <input type="password" formControlName="password" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.password.errors }" />
                        <div *ngIf="submitted && f.password.errors" class="invalid-feedback">
                            <div *ngIf="f.password.errors.required">Password is required</div>
                            <div *ngIf="f.password.errors.minlength">Password must be at least 6 characters</div>
                        </div>
                    </div>
                    <div class="form-group">
                        <button class="btn btn-primary">Submit</button>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>

 Now you are done with Angular Form Validations and if you have any query related to this post, then ask questions or comment below.

therichpost
the authortherichpost
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 14, Angular 15, Angular 16, Angular 17, Bootstrap 5, Nodejs, Laravel, Codeigniter, Shopify, Squarespace, jQuery, Google Map Api, Vuejs, Reactjs, Big commerce etc.

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