I have a reset-password form with 2 input fields:
- New Password
- New Password (confirmation)
I had to create a validation where "New Password (confirmation) needed to match "New Password" and I made it. When you type in a wrong password in "New Password (confirmation) field, it gives an error and wont let you submit the form until it matches the password in field "New Password".But if I go back and change "New Password" field, "New Password (confirmation) field shows it like they still match even though they arent anymore...So my question is: how can i fix this issue?
Any advice is appreciated
ts file
import { AbstractControl, FormBuilder, FormControl, Validators } from '@angular/forms';
import { AppConfig } from 'src/app/_common/configs/app.config';
import { Component } from '@angular/core';
@Component({
selector: 'app-reset-password',
templateUrl: './reset-password.component.html',
styleUrls: ['./reset-password.component.scss'],
})
export class ResetPasswordComponent {
passwordsMatching = false;
isConfirmPasswordDirty = false;
confirmPasswordClass = 'form-control';
appConfig = AppConfig;
newPassword = new FormControl(null, [
(c: AbstractControl) => Validators.required(c),
Validators.pattern('^((?!.*[s])(?=.*[A-Z])(?=.*d).{8,99})'),
]);
confirmPassword = new FormControl(null, [
(c: AbstractControl) => Validators.required(c),
Validators.pattern('^((?!.*[s])(?=.*[A-Z])(?=.*d).{8,99})'),
]);
resetPasswordForm = this.formBuilder.group({
newPassword: this.newPassword,
confirmPassword: this.confirmPassword,
});
constructor(private formBuilder: FormBuilder) {}
onSubmit(): void {
if (!this.resetPasswordForm?.valid) {
return;
}
}
checkPasswords(pw: string, cpw: string) {
this.isConfirmPasswordDirty = true;
if (pw == cpw) {
this.passwordsMatching = true;
this.confirmPasswordClass = 'form-control is-valid';
} else {
this.passwordsMatching = false;
this.confirmPasswordClass = 'form-control is-invalid';
}
}
}
**
HTML**
<section >
<div >
<div >
<div >
<h4 >Reset password</h4>
<form [formGroup]="resetPasswordForm" (ngSubmit)="onSubmit()">
<div >
<label for="newPassword">New password: </label>
<input id="newPassword" type="password"
formControlName="newPassword" #pw>
<div *ngIf="newPassword.invalid && (newPassword.dirty || newPassword.touched)"
>
<div *ngIf="newPassword.errors?.['required']">
Field is required
</div>
<div *ngIf="newPassword.errors?.['pattern']">
Password must contain at least one number, one uppercase and a lowercase letter
and at least 8 characters<br>Password cannot contain whitespace
</div>
</div>
</div>
<div >
<label for="confirmPassword">New password (confirmation):</label>
<input id="confirmPassword" type="password"
[ngClass]='confirmPasswordClass' formControlName="confirmPassword"
#cpw (keyup)='checkPasswords(pw.value, cpw.value)'>
<div *ngIf="confirmPassword.invalid && (confirmPassword.dirty || confirmPassword.touched)"
>
<div *ngIf="confirmPassword.errors?.['required']">
Field is required
</div>
<div *ngIf="confirmPassword.errors?.['pattern']">
Password must contain at least one number, one uppercase and a lowercase letter
and at least 8 characters<br>Password cannot contain whitespace
</div>
<div *ngIf='!passwordsMatching && isConfirmPasswordDirty'>
Passwords did not match
</div>
</div>
</div>
<div >
<button [disabled]="!resetPasswordForm.valid" type="submit" >
Reset password
</button>
<button type="button" appBackButton>Back</button>
</div>
</form>
</div>
</div>
</div>
</section>
CodePudding user response：
I have done some changes on your code so please check
ts file
export class AppComponent {
name = 'Angular ' VERSION.major;
passwordsMatching = false;
isConfirmPasswordDirty = false;
confirmPasswordClass = 'form-control';
newPassword = new FormControl(null, [
(c: AbstractControl) => Validators.required(c),
Validators.pattern(
/(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@$!%*#?&^_-]).{8,}/
),
]);
confirmPassword = new FormControl(null, [
(c: AbstractControl) => Validators.required(c),
Validators.pattern(
/(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@$!%*#?&^_-]).{8,}/
),
]);
resetPasswordForm = this.formBuilder.group(
{
newPassword: this.newPassword,
confirmPassword: this.confirmPassword,
},
{
validator: this.ConfirmedValidator('newPassword', 'confirmPassword'),
}
);
constructor(private formBuilder: FormBuilder) {}
onSubmit(): void {
console.log(this.resetPasswordForm);
if (!this.resetPasswordForm?.valid) {
return;
}
}
ConfirmedValidator(controlName: string, matchingControlName: string) {
return (formGroup: FormGroup) => {
const control = formGroup.controls[controlName];
const matchingControl = formGroup.controls[matchingControlName];
if (
matchingControl.errors &&
!matchingControl.errors.confirmedValidator
) {
return;
}
if (control.value !== matchingControl.value) {
matchingControl.setErrors({ confirmedValidator: true });
} else {
matchingControl.setErrors(null);
}
};
}
}
HTML
<section >
<div >
<div >
<div >
<h4 >Reset password</h4>
<form
[formGroup]="resetPasswordForm"
(ngSubmit)="onSubmit()"
>
<div >
<label for="newPassword">New password: </label>
<input
id="newPassword"
type="password"
formControlName="newPassword"
#pw
/>
<div
*ngIf="
newPassword.invalid &&
(newPassword.dirty || newPassword.touched)
"
>
<div *ngIf="newPassword.errors?.['required']">
Field is required
</div>
<div *ngIf="newPassword.errors?.['pattern']">
Password must contain at least one number, one uppercase and a
lowercase letter and at least 8 characters<br />Password cannot
contain whitespace
</div>
</div>
</div>
<div >
<label for="confirmPassword">New password (confirmation):</label>
<input
id="confirmPassword"
type="password"
[ngClass]="confirmPasswordClass"
formControlName="confirmPassword"
#cpw
/>
<div
*ngIf="
confirmPassword.invalid &&
(confirmPassword.dirty || confirmPassword.touched)
"
>
<div *ngIf="confirmPassword.errors?.['required']">
Field is required
</div>
<div *ngIf="confirmPassword.errors?.['pattern']">
Password must contain at least one number, one uppercase and a
lowercase letter and at least 8 characters<br />Password cannot
contain whitespace
</div>
<div *ngIf="confirmPassword.errors?.['confirmedValidator']">
Passwords did not match
</div>
</div>
</div>
<div >
<button
type="submit"
[disabled]="resetPasswordForm.invalid"
>
Reset password
</button>
<button
type="button"
appBackButton
>
Back
</button>
</div>
</form>
</div>
</div>
</div>
</section>
And here is the working demo of it:- https://stackblitz.com/edit/angular-ivy-pjdyva?file=src/app/app.component.ts
CodePudding user response：
You can add a validator directly to your FormGroup which compares the value of your two form controls.
Form Group
First we create a form group which handles validation on each individual input field:
passwordForm: FormGroup;
constructor(fb: FormBuilder) {
this.passwordForm = fb.group({
// any validators you may need to check the formatting of your password
password: fb.control('', [Validators.required])
check: fb.control('', [Validators.required])
});
}
Validating the Form Group itself
Now we just need to validate that our two controls match, this can be done by adding another validator directly to our FormGroup
I made a function which constructs a new validator, comparing the values of each:
function createCompareValidator(controlOne: AbstractControl, controlTwo: AbstractControl) {
return () => {
if (control.value !== controlTwo.value)
return { match_error: 'Value does not match' };
return null;
};
}
combining them
In our constructor, after creating your FormGroup we now add the new validator to the FormGroup itself.
// continued inside constructor()
this.passwordForm.addValidator(
createCompareValidator(
this.passwordForm.get('password'),
this.passwordForm.get('check')
)
);
That's it, now your FormGroup will automatically check for errors every time the values between password and check do not match: