I have created a parent component as follows:
<form [formGroup] = "cardForm">
<app-inputvalidator [controls] = "cardForm.get('name')"></app-inputvalidator>
</form>
Parent ts file
import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl,Validators } from '@angular/forms';
@Component({
selector: 'app-card-form',
templateUrl: './card-form.component.html',
styleUrls: ['./card-form.component.css']
})
export class CardFormComponent implements OnInit {
nameFormControl ;
cardForm = new FormGroup({
name: new FormControl('', [Validators.minLength(5),Validators.maxLength(25)])
});
constructor() {
}
ngOnInit(): void {
this.nameFormControl = this.cardForm.get('name');
}
}
I am passing the nameFormControls to the child component and accessing it in the template as well as class as follows:
InputValidator.ts
import { Component, OnInit, Input } from '@angular/core';
import { FormControl} from '@angular/forms';
@Component({
selector: 'app-inputvalidator',
templateUrl: './inputvalidator.component.html',
styleUrls: ['./inputvalidator.component.css']
})
export class InputvalidatorComponent implements OnInit {
@Input() controls: FormControl;
constructor() {
}
ngOnInit(): void {
}
}
Input Validator.html
<input [formControlName] = "controls"
<br>
<div>{{ controls.errors | json}}</div>
The project is compiled successfully with no errors.
I am getting the value of controls.errors to always null. Why can I not print the object controls.errors using string interpolation as the value in the name input box changes?
check the validator source