Hello Dev.
I'm going to show you instance of angular 11 reactive forms validation. i explained honestly one by one angular 11 forms validation example. i explained virtually one by one angular 11 reactive forms example. one by one provide an explanation for reactive form validation in angular 11. comply with bellow step for angular 11 form validation example.
Reactive forms offer a model-driven method to dealing with form inputs whose values change over the time. In Reactive forms, we need to import ReactiveFormsModule
from angular forms library. we will use FormControl, FormGroup, FormArray, Validation instructions with Reactive forms in angular 11 app.
If you have simple and basic form in your angular 11 application then i will prefer to use Reactive forms in angular. here i write simple example of Reactive forms with validation in angular 11.
You need to follow bellow step to create reactive forms in angular 11.
Here, in this step you need to create new ng app for this demo. if you have already created then don't create new angular 11 app.
ng new my-new-app
If you want to create form in angular app then you need to import FormsModule from @angular/forms
library. so let's add following code to app.module.ts file.
src/app/app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
FormsModule,
ReactiveFormsModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
In this step, we will write code of html form with ngModel. so add following code to app.component.html file. I have used bootstrap class on this form.
src/app/app.component.html
<h1>Angular 11 Reactive Forms Validation Example - meaningarticles.com</h1>
<form [formGroup]="form" (ngSubmit)="submit()">
<div class="form-group">
<label for="name">Name</label>
<input
formControlName="name"
id="name"
type="text"
class="form-control">
<div *ngIf="f.name.touched && f.name.invalid" class="alert alert-danger">
<div *ngIf="f.name.errors.required">Name is required.</div>
<div *ngIf="f.name.errors.minlength">Name should be 3 character.</div>
</div>
</div>
<div class="form-group">
<label for="email">Email</label>
<input
formControlName="email"
id="email"
type="text"
class="form-control">
<div *ngIf="f.email.touched && f.email.invalid" class="alert alert-danger">
<div *ngIf="f.email.errors.required">Email is required.</div>
<div *ngIf="f.email.errors.email">Please, enter valid email address.</div>
</div>
</div>
<div class="form-group">
<label for="body">Body</label>
<textarea
formControlName="body"
id="body"
type="text"
class="form-control">
</textarea>
<div *ngIf="f.body.touched && f.body.invalid" class="alert alert-danger">
<div *ngIf="f.body.errors.required">Body is required.</div>
</div>
</div>
<button class="btn btn-primary" type="submit">Submit</button>
</form>
In ts file. we will write submit()
and get all input fields values. so let's add following code to app.component.ts file.
src/app/app.component.ts
import { Component } from '@angular/core';
import { FormGroup, FormControl, Validators} from '@angular/forms';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
form = new FormGroup({
name: new FormControl('', [Validators.required, Validators.minLength(3)]),
email: new FormControl('', [Validators.required, Validators.email]),
body: new FormControl('', Validators.required)
});
get f(){
return this.form.controls;
}
submit(){
console.log(this.form.value);
}
}
Now you can run your application using following command:
i'm hoping it assist you to, thanks for visit my article if you like my article then proportion together with your friend and social platform.