我正在尝试实现自定义验证程序，以检查密码和密码确认是否相同。问题是验证器正在获取未定义的密码和确认的密码参数。我该如何做这项工作。该函数有效，如果我将条件更改为===而不是！==当字段相同时，它会正确地抛出错误。有谁知道这里的错误是什么？
signup.component.html
<div class="col-md-7 col-md-offset-1 col-sm-7">
<div class="block">
<div class="well">
<form (onSubmit)="onSubmit()" [formGroup]="signUpForm">
<div class="form-group">
<label for="username" class="control-label">Nombre de usuario:</label>
<input type="text" class="form-control" formControlName="username" title="Please enter your username" placeholder="username">
<p class="help-block" *ngIf="signUpForm.get('username').hasError('required') && signUpForm.get('username').touched">El nombre de usuario es obligatorio</p>
<p class="help-block" *ngIf="signUpForm.get('username').hasError('minlength') && signUpForm.get('username').touched">El nombre de usuario debe tener al menos 6 caracteres</p>
<p class="help-block" *ngIf="signUpForm.get('username').hasError('maxlength') && signUpForm.get('username').touched">El nombre de usuario debe tener menos de 15 caracteres</p>
</div>
<div class="form-group">
<label for="email" class="control-label">E-mail:</label>
<input class="form-control" formControlName="email" title="Please enter your email" placeholder="example@gmail.com">
<p class="help-block" *ngIf="signUpForm.get('email').hasError('required') && signUpForm.get('email').touched">La dirección de email es obligatoria</p>
<p class="help-block" *ngIf="signUpForm.get('email').hasError('email') && signUpForm.get('email').touched">Debe ingresar una dirección de correo válida</p>
</div>
<div class="form-group">
<label for="password" class="control-label">Contraseña:</label>
<input type="password" class="form-control" formControlName="password" title="Please enter your password" [(ngModel)]="password">
<p class="help-block" *ngIf="signUpForm.get('password').hasError('required') && signUpForm.get('password').touched">Debe ingresar una contraseña</p>
</div>
<div class="form-group">
<label for="confirmedPassword" class="control-label">Confirmar Contraseña:</label>
<input type="password" class="form-control" formControlName="confirmedPassword" title="Please re-enter your password" [(ngModel)]="confirmedPassword">
<p class="help-block" *ngIf="signUpForm.get('confirmedPassword').hasError('required') && signUpForm.get('confirmedPassword').touched">La confirmación de contraseña no puede estar vacía</p>
<p class="help-block" *ngIf="signUpForm.get('confirmedPassword').hasError('passwordMismatch') && signUpForm.get('confirmedPassword').touched">Las contraseñas no coinciden</p>
</div>
<button type="submit" class="btn btn-success" [disabled]="!signUpForm.valid">Registrarse</button>
<a routerLink="/signin" class="btn btn-default" style="">Ya tenes usuario? Logueate</a> {{ creationMessage }}
</form>
</div>
</div>
</div>
signup.component.ts
import { Component, OnInit, ViewChild, Input } from '@angular/core';
import { FormControl, FormGroup, Validators } from '@angular/forms';
import { CustomValidators } from '../../shared/custom-validators';
import { Observable } from 'rxjs/Observable';
@Component({
selector: 'app-signup',
templateUrl: './signup.component.html',
styleUrls: ['./signup.component.sass']
})
export class SignupComponent implements OnInit {
signUpForm: FormGroup;
user = {
username: '',
email: '',
password: ''
};
submitted = false;
@Input() password='';
@Input() confirmedPassword='';
constructor() { }
ngOnInit() {
this.signUpForm = new FormGroup({
'username': new FormControl(null, [Validators.required, Validators.minLength(6), Validators.maxLength(15)]),
'email': new FormControl(null, [Validators.required, Validators.email, Validators.minLength(5)]),
'password': new FormControl(null, [Validators.required]),
'confirmedPassword': new FormControl(null, [Validators.required, CustomValidators.passwordsMatch(this.password,this.confirmedPassword).bind(this)])
});
}
onSubmit() {
if (this.signUpForm.valid) {
console.log(this.signUpForm.value);
}
}
}
自定义-validators.ts
import { FormControl } from '@angular/forms';
export class CustomValidators{
public static passwordsMatch(password: string, confirmedPassword: string) {
return (control: FormControl) : { [s: string]: boolean } =>{
//getting undefined values for both variables
console.log(password,confirmedPassword);
//if I change this condition to === it throws the error if the
// two fields are the same, so this part works
if (password !== confirmedPassword) {
return { 'passwordMismatch': true }
} else {
//it always gets here no matter what
return null;
}
}
}
}
答案 0 :(得分：35)
从
导入{AbstractControl，FormBuilder，FormGroup，Validators}
将您的密码输入设置为组，无需使用“ngModel”。
<div class="form-group row" formGroupName="passwords">
<div class="form-group">
<label for="password" class="control-label">Contraseña:</label>
<input type="password" class="form-control" formControlName="password" title="Please enter your password">
<p class="help-block" *ngIf="signUpForm.get('password').hasError('required') && signUpForm.get('password').touched">Debe ingresar una contraseña</p>
</div>
<div class="form-group">
<label for="confirmedPassword" class="control-label">Confirmar Contraseña:</label>
<input type="password" class="form-control" formControlName="confirmedPassword" title="Please re-enter your password">
<p class="help-block" *ngIf="signUpForm.get('confirmedPassword').hasError('required') && signUpForm.get('confirmedPassword').touched">La confirmación de contraseña no puede estar vacía</p>
<p class="help-block" *ngIf="signUpForm.get('confirmedPassword').hasError('passwordMismatch') && signUpForm.get('confirmedPassword').touched">Las contraseñas no coinciden</p>
</div>
buildForm(): void {
this.userForm = this.formBuilder.group({
passwords: this.formBuilder.group({
password: ['', [Validators.required]],
confirm_password: ['', [Validators.required]],
}, {validator: this.passwordConfirming}),
});
}
添加此自定义功能以验证密码并确认密码
passwordConfirming(c: AbstractControl): { invalid: boolean } {
if (c.get('password').value !== c.get('confirm_password').value) {
return {invalid: true};
}
}
密码不匹配时显示错误
<div style='color:#ff7355' *ngIf="userForm.get(['passwords','password']).value != userForm.get(['passwords','confirm_password']).value && userForm.get(['passwords','confirm_password']).value != null">
Password does not match</div>
答案 1 :(得分：8)
问题是您将反应表单模块与输入法混合。这会导致您在将值传递给验证程序时获得undefined。
使用反应形式时，您不需要绑定到ng-model。相反，您应该从FormGroup的实例中访问字段的值。
我在应用中做了类似的事情来验证密码匹配。
public Credentials: FormGroup;
ngOnInit() {
this.Credentials = new FormGroup({});
this.Credentials.addControl('Password', new FormControl('', [Validators.required]));
this.Credentials.addControl('Confirmation', new FormControl(
'', [Validators.compose(
[Validators.required, this.validateAreEqual.bind(this)]
)]
));
}
private validateAreEqual(fieldControl: FormControl) {
return fieldControl.value === this.Credentials.get("Password").value ? null : {
NotEqual: true
};
}
请注意，验证程序需要FormControl字段作为参数，并将字段值与Password {{1}的Credentials字段值进行比较}。
在FormGroup中，请务必删除HTML。
ng-model希望这有帮助！
答案 2 :(得分：4)
请在Angular5中更新FormGroup代码，如下所示
pwdMatchValidator在您的组件中添加pwdMatchValidator(frm: FormGroup) {
return frm.get('password').value === frm.get('confirmedPassword').value
? null : {'mismatch': true};
}
功能
<span *ngIf="confirmedPassword.errors || signUpForm .errors?.mismatch">
Password doesn't match
</span>
在模板中添加验证消息
password.component.html请找到以下角材料工作组件。
组件Templete代码 <form class="cahnge-pwd-form" (ngSubmit)="onSubmit()" name="passwordForm" [formGroup]="passwordForm" #formDir="ngForm">
<div fxLayout='column'>
<mat-form-field>
<input matInput name="password" placeholder="Password" [type]="hide ? 'text' : 'password'" formControlName="password" required>
<mat-icon matSuffix (click)="hide = !hide">{{hide ? 'visibility_off' : 'visibility'}}</mat-icon>
<mat-error *ngIf="password.invalid && (password.dirty || password.touched || isSubmit)">
<span *ngIf="password.errors.required">
Please enter a Password.
</span>
<span *ngIf="password.errors.maxlength">
Please enter a Email no more than 16 characters.
</span>
<span *ngIf="password.errors.minlength">
Please enter a password at least 6 characters.
</span>
</mat-error>
</mat-form-field>
<mat-form-field>
<input matInput name="password" placeholder="Confirm Password" [type]="confirm_hide ? 'text' : 'password'" formControlName="confirm_password"
required>
<mat-icon matSuffix (click)="confirm_hide = !confirm_hide">{{confirm_hide ? 'visibility_off' : 'visibility'}}</mat-icon>
<mat-error *ngIf="(confirm_password.invalid && (confirm_password.dirty || confirm_password.touched || isSubmit) || passwordForm.errors?.mismatch)">
<span *ngIf="confirm_password.errors || passwordForm.errors?.mismatch">
Password doesn't match
</span>
</mat-error>
</mat-form-field>
<div fxLayout='row' fxLayoutGap="10px">
<button type="submit" mat-raised-button color="primary">Submit</button>
<button type="button" (click)="formDir.resetForm(passwordForm)" mat-raised-button color="warn">Cancel</button>
</div>
</div>
</form>
password.component.ts组件代码：import { Component, OnInit, AfterViewInit } from '@angular/core';
import { FormControl, FormGroup, Validators, FormBuilder } from '@angular/forms';
import { ToastrService } from 'ngx-toastr';
import { Router, ActivatedRoute, ParamMap } from '@angular/router';
import { PasswordService } from './password.service';
import { PasswordValidation } from './confirm';
@Component({
selector: 'app-password',
templateUrl: './password.component.html',
styleUrls: ['./password.component.css']
})
export class PasswordComponent implements OnInit {
passwordForm: FormGroup;
isSubmit: boolean;
constructor(private router: Router, private passwordService: PasswordService, private toastrService: ToastrService, private route: ActivatedRoute) { }
ngOnInit() {
this.passwordForm = new FormGroup({
'password': new FormControl('', [
Validators.required,
Validators.minLength(6),
Validators.maxLength(16),
]),
'confirm_password': new FormControl('', [
Validators.required,
Validators.minLength(6),
Validators.maxLength(16),
]),
}, this.pwdMatchValidator);
}
pwdMatchValidator(frm: FormGroup) {
return frm.get('password').value === frm.get('confirm_password').value
? null : {'mismatch': true};
}
get password() { return this.passwordForm.get('password'); }
get confirm_password() { return this.passwordForm.get('confirm_password'); }
onSubmit(formvalue):boolean {
this.isSubmit = true;
if (this.passwordForm.invalid) {
return false;
} else {
this.passwordService.updatePassword(this.passwordForm.value)
.subscribe((res) => {
if (res.status == 'success') {
this.toastrService.success(res.msg);
this.router.navigate(['/change-password']);
}
})
return true;
}
}
}
{{1}}
答案 3 :(得分：3)
有两种类型的验证器： FormGroup验证器和 FormControl验证器。要验证两个密码是否匹配，您必须添加FormGroup验证器。以下是我的例子：
注意：this.fb是注入的FormBuilder
this.newAccountForm = this.fb.group(
{
newPassword: ['', [Validators.required, Validators.minLength(6)]],
repeatNewPassword: ['', [Validators.required, Validators.minLength(6)]],
},
{validator: this.passwordMatchValidator}
);
passwordMatchValidator(frm: FormGroup) {
return frm.controls['newPassword'].value === frm.controls['repeatNewPassword'].value ? null : {'mismatch': true};
}
并在寺庙中：
<div class="invalid-feedback" *ngIf="newAccountForm.errors?.mismatch && (newAccountForm.controls['repeatNewPassword'].dirty || newAccountForm.controls['repeatNewPassword'].touched)">
Passwords don't match.
</div>
这里的关键点是将FormGroup验证器作为第二个参数添加到group方法中。
答案 4 :(得分：1)
如果您需要在多个字段上进行验证，并且希望在表单创建时声明验证器，则必须使用 FormGroup验证器。表单验证器的主要问题是它将错误附加到表单而不是验证控件，这导致模板中的某些不一致之处。这是可重用的表单验证器，它将错误附加到表单和控件上
// in validators.ts file
export function controlsEqual(
controlName: string,
equalToName: string,
errorKey: string = controlName // here you can customize validation error key
) {
return (form: FormGroup) => {
const control = form.get(controlName);
if (control.value !== form.get(equalToName).value) {
control.setErrors({ [errorKey]: true });
return {
[errorKey]: true
}
} else {
control.setErrors(null);
return null
}
}
}
// then you can use it like
ngOnInit() {
this.vmForm = this.fb.group({
username: ['', [Validators.required, Validators.email]],
password: ['', [
Validators.required,
Validators.pattern('[\\w\\d]+'),
Validators.minLength(8)]],
confirm: [''], // no need for any validators here
}, {
// here we attach our form validator
validators: controlsEqual('confirm', 'password')
});
}
答案 5 :(得分：0)
当您创建验证程序时，您传递了password和confirmedPassword的值，但这些值的更改不会反映在验证程序中。
我看到的两个选项是：
FormGroup上定义验证器，并从要比较的两个控件中查找值;或this，请在验证工具中使用this.password和this.confirmedPassword。答案 6 :(得分：0)
我会像 Shailesh Ladumor 那样做，但在返回验证功能之前添加以下行：
c.get('confirm_password').setErrors({'noMatch': true});
这样验证函数如下所示：
passwordConfirming(c: AbstractControl): { invalid: boolean } {
if (c.get('password').value !== c.get('confirm_password').value) {
c.get('confirm_password').setErrors({'noMatch': true});
return {invalid: true};
}
}
这不仅会将小洞userForm设置为无效的表单组，而且还会将confirm_password设置为无效的表单控件。
通过此操作，您可以稍后在模板中调用以下函数：
public getPasswordConfirmationErrorMessage() {
if (this.userForm.get('confirm_password').hasError('required')) {
return 'You must retype your password';
} else if (this.userForm.get('confirm_password').hasError('noMatch')) {
return 'Passwords do not match';
} else {
return '';
}
}
答案 7 :(得分：0)
this.myForm = this.fb.group({
userEmail: [null, [Validators.required, Validators.email]],
pwd: [null, [Validators.required, Validators.minLength(8)]],
pwdConfirm: [null, [Validators.required]],
}, {validator: this.pwdConfirming('pwd', 'pwdConfirm')});
pwdConfirming(key: string, confirmationKey: string) {
return (group: FormGroup) => {
const input = group.controls[key];
const confirmationInput = group.controls[confirmationKey];
return confirmationInput.setErrors(
input.value !== confirmationInput.value ? {notEquivalent: true} : null
);
};
}
答案 8 :(得分：0)
仅出于多样性，我将添加另一种方法来执行此操作。基本上，我创建了一个简单的自定义验证器，该验证器采用原始控件（第一个输入字段）并使用重新输入控件（第二个控件）检查其值。
import { AbstractControl, ValidatorFn } from "@angular/forms";
export abstract class ReEnterValidation {
static reEnterValidation(originalControl: AbstractControl): ValidatorFn {
return (control: AbstractControl): { [s: string]: boolean } => {
if (control.value != originalControl.value) {
return { 'reentry': true };
}
};
}
}
您可以在创建新的表单控件时最初设置此验证器：
control1 = new FormControl('', ReEnterValidation.reEnterValidation(control2));
或者，您可以随后进行设置：
control.setValidators(ReEnterValidation.reEnterValidation(this._newPinControl));
control.updateValueAndValidity();
在视图中，您可以显示以下错误：
<!-- Confirm pin validation -->
<div *ngIf="control2.invalid && (control2.dirty || control2.touched)">
<div *ngIf="control2.errors.reentry">
The re-entered password doesn't match. Please try again.
</div>
</div>
答案 9 :(得分：0)
只想补充。我使用 Reactive 表单，所以很容易在表单上使用订阅 valueChanges 进行自定义验证
this.registrationForm.valueChanges.subscribe(frm => {
const password = frm.password;
const confirm = frm.confirmPassword;
if (password !== confirm) {
this.registrationForm.get('confirmPassword').setErrors({ notMatched: true });
}
else {
this.registrationForm.get('confirmPassword').setErrors(null);
}
});
}
答案 10 :(得分：-1)
const form = new FormGroup({
password: new FormControl('', Validators.minLength(2)),
passwordConfirm: new FormControl('', Validators.minLength(2)),
}, passwordMatchValidator);
function passwordMatchValidator(g: FormGroup) {
return g.get('password').value === g.get('passwordCenter code hereonfirm').value
? null : {'mismatch': true};
}
必须创建新服务，并且您可以在要验证密码和确认字段时调用已创建的服务。