Form Validation after updating Ionic - ionic-framework

Question

I had a Form Validation working but after updating Ionic doesn't work. Here's my code:
form.html
<ion-header>
<ion-navbar>
<ion-title>
Authorization Form Demo
</ion-title>
</ion-navbar>
</ion-header>
<ion-content class="home" padding>
<form [ngFormModel]="authForm" (ngSubmit)="onSubmit(authForm.value)">
<ion-item [class.error]="!username.valid && username.touched">
<ion-label floating>Username</ion-label>
<ion-input type="text" value="" [ngFormControl]="username"></ion-input>
</ion-item>
<div *ngIf="username.hasError('required') && username.touched"
class="error-box">* Username is required!</div>
<div *ngIf="username.hasError('minlength') && username.touched"
class="error-box">* Minimum username length is 8!</div>
<div *ngIf="username.hasError('checkFirstCharacterValidator') && username.touched"
class="error-box">* Username cant't start with number!</div>
<ion-item [class.error]="!password.valid && password.touched">
<ion-label floating>Password</ion-label>
<ion-input type="text" value="" [ngFormControl]="password" ></ion-input>
</ion-item>
<div *ngIf="password.hasError('required') && password.touched"
class="error-box">* Password is required</div>
<div *ngIf="password.hasError('minlength') && password.touched"
class="error-box">* Minimum password length is 8!</div>
<div *ngIf="password.hasError('checkFirstCharacterValidator') && password.touched"
class="error-box">* Password cant't start with number!</div>
<br/><br/>
<button type="submit" class="custom-button" [disabled]="!authForm.valid" block>Submit</button>
</form>
</ion-content>
form.ts
import {Component} from '#angular/core';
import {NavController} from 'ionic-angular';
import {FORM_DIRECTIVES, FormBuilder, ControlGroup, Validators, AbstractControl} from '#angular/common';
import {CustomValidators} from '../validators/CustomValidators';
#Component({
templateUrl: 'build/pages/form/form.html',
directives: [FORM_DIRECTIVES]
})
export class FormPage {
authForm: ControlGroup;
username: AbstractControl;
password: AbstractControl;
constructor(private navController: NavController, private fb: FormBuilder) {
this.authForm = fb.group({
'username': ['', Validators.compose([Validators.required, Validators.minLength(8), CustomValidators.checkFirstCharacterValidator])],
'password': ['', Validators.compose([Validators.required, Validators.minLength(8), CustomValidators.checkFirstCharacterValidator])]
});
this.username = this.authForm.controls['username'];
this.password = this.authForm.controls['password'];
}
onSubmit(value: string): void {
if(this.authForm.valid) {
console.log('Submitted value: ', value);
}
}
}
CustomValidators.ts
import { Control, ControlGroup } from "#angular/common";
interface ValidationResult {
[key: string]: boolean;
}
export class CustomValidators {
public static checkFirstCharacterValidator(control: Control): ValidationResult {
var valid = /^\d/.test(control.value);
if (valid) {
return {checkFirstCharacterValidator: true};
}
return null;
}
}
Somebody know what changes I need to do for working fine?
Thanks in advance.
Best regards.

Answer 1

Beta11 of Ionic2 has made breaking changes in form handling, you can read more here.
form.ts edit two lines to look like this:
import {FORM_DIRECTIVES, FormBuilder, FormGroup, Validators, AbstractControl} from '#angular/forms';
authForm: FormGroup;
You need to import new forms component from #angular/forms not the deprecated one #angular/common and change deprecated ControlGroup to FormGroup
In form.html edit one line to:
<form [formGroup]="authForm" (ngSubmit)="onSubmit(authForm.value)" novalidate>
Change deprecated ngFormModel to formGroup and consider adding novalidate attribute to your form.
To make your custom validator work you also have to change two lines in CustomValidators.ts but I didnt have time to read all changes and never used custom validators before. So this may require more work
import { FormControl, FormGroup } from "#angular/forms";
public static checkFirstCharacterValidator(control: FormControl): ValidationResult {