Angular form - field validation

Question

I have this code:

form [formGroup]="form">
  <input formControlName="name">
  <span *ngIf="form.controls.name.invalid">1234</span>
  <button #myButton></button>
</form>

and Component:

import { Component, Inject, OnInit } from '@angular/core';
import { FormGroup, FormControl, Validators } from '@angular/forms';
import { DOCUMENT } from '@angular/common';


@Component({
   selector: 'my-app',
   templateUrl: './app.component.html',
   styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  constructor(
   @Inject(DOCUMENT) private document: Document) {

}
form = new FormGroup({
  name: new FormControl('', [Validators.required])
});


ngOnInit() {    
  document.getElementById('myButton').focus();
}
}

Sample

I am getting validation error eventhough I am not even setting a focus on that field.

Any idea?

Thanks

Volodymyr Herchuk · Accepted Answer · 2022-10-12 17:18:35Z

2

Field is required and it's not filled, therefor it's invalid, so you see an error. to achieve result that you want (I presume display error only after focus) you can do smth like:

*ngIf="form.controls.name.invalid && form.touched"

answered Oct 12, 2022 at 17:18

Volodymyr Herchuk

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Comments

Tanner · Accepted Answer · 2022-10-12 17:14:55Z

1

The field is invalid; it has no value and you've specified that it's required.

If you only want to show the error when it's invalid and touched, add && form.controls.name.touched to your ngIf.

answered Oct 12, 2022 at 17:14

Tanner

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