CODEWITHSUNDEEP
angularformstypescriptangular-reactive-forms
Tayyab Rahman
Tayyab Rahman

Reputation: 391

Show Validation Message on submit in Angular 4 Reactive Forms

I am using Angular 4, Reactive forms.I want to show validation error message when the user clicks on Submit/Create Account button. Here is the HTML and typescript code that I am using. 

<form [formGroup]="signupForm" (ngSubmit)="onSubmit()">

  <div class="form-group">
    <input type="text" 
           id="firstname" 
           name="firstname" 
           formControlName="firstname" 
           placeholder="First Name">
    <span *ngIf="!signupForm.get('firstname').valid && signupForm.get('firstname').touched" 
           class="help-block"> Please Enter First Name (Minimum 2 Characters)</span>
  </div>

  <div class="form-group">
    <input type="text" 
           id="lastname" 
           name="lastname" 
           formControlName="lastname" 
           placeholder="Last Name">
    <span *ngIf="!signupForm.get('lastname').valid && signupForm.get('lastname').touched" 
           class="help-block"> Please Enter Last Name (Minimum 2 Characters)</span>
  </div>

  <div class="form-group">
    <button type="submit" 
            class="btn btn-success btn-lg btn-qte">Create Account</button>
  </div>

</form>

TYPE SCRIPT CODE

export class UserRegistrationComponent implements OnInit {
    signupForm: FormGroup;

    ngOnInit() {
        this.signupForm = new FormGroup({
            'firstname': new FormControl(null, [Validators.required, Validators.minLength(2)]),
            'lastname': new FormControl(null, [Validators.required, Validators.minLength(2),]),
            'businessname': new FormControl(null),
            'phonenumber': new FormControl(null, [Validators.required]),
            'email': new FormControl(null, [Validators.required, Validators.email]),
            'password': new FormControl(null, [Validators.required]),
            'confirmpassword': new FormControl(null, Validators.required)

        });
    }

    onSubmit() {
        console.log(this.signupForm)
    }

}

Upvotes: 11

Views: 26186

Answers (3)

omer
omer

Reputation: 2623

you can do this using from markAllAsTouched() method. it will mark all the form controls as touched and by doing so will trigger validation errors where needed

onSubmit() {
    this.signupForm.markAllAsTouched();
}

Upvotes: 20

Ankit Prajapati
Ankit Prajapati

Reputation: 2820

To get the properties like touched, dirty, valid of form control through formGroup use :

signupForm.controls.firstname.touched. same way you can get the other properties like valid and invalid.

if you have created individual object of FormControl then, you can access that object properties as firstname.touched without using formGroup.

for more information about the validation in Model Driven Forms refer Model Driven Form Validations here.

Upvotes: 1

user3733648
user3733648

Reputation: 1333

Something like

onSubmit() {
    console.log(this.signupForm)
    this.signupForm.controls['firstname'].markAsTouched()
}

Upvotes: 24

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