How to check whether a form or a control is valid or not in Angular 10 ?

In this article, we are going to check whether a form is touched or not in Angular 10. The valid property is used to report that the control or the form is valid or not.

Syntax:

form.valid

Return Value:

• boolean: the boolean value to check whether a form is valid or not.

NgModule: Module used by the valid property is:

• FormsModule

Approach: 

• Create the Angular app to be used.
• In app.component.html make a form using ngForm directive.
• In app.component.ts get the information using the valid property.
• Serve the angular app using ng serve to see the output.

Example:

Javascript

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

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html'
})

export class AppComponent {
    form = new FormGroup({
        name: new FormControl(

        ),
        rollno: new FormControl()
    });

    get name(): any {
        return this.form.get('name');
    }

    onSubmit(): void {
        console.log("Form is valid : ", this.form.valid);
    }
}

app.component.html

<form [formGroup]="form" (ngSubmit)="onSubmit()">
    <input formControlName="name" placeholder="Name">
    <br>

    <button type='submit'>Submit</button>
    <br><br>
</form>

Output:

Reference: >https://angular.io/api/forms/AbstractControlDirective#valid