在响应式表格上的​​自定义验证器,用于密码和确认密码匹配,将未定义的参数转换为Angular 4

Question

我正在尝试实现自定义验证器来检查密码和密码确认是否相等.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);
    }
  }

}

定制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;
        }
    }
      }


    }

Answer 1

从中导入{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和确认密码

  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>

Answer 2

问题是您正在将反应表单模块与输入方法混合使用.这会导致您undefined在将值传递给验证器时获得.

ng-model使用反应形式时,您无需绑定.相反,您应该从Instance of中访问字段的值FormGroup.

我在应用程序中执行类似这样的操作来验证密码匹配.

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
    };
}

需要注意的是验证需要一个FormControl字段作为参数,并将其字段的值与该值的Password领域Credentials FormGroup.

在HTML确保删除ng-model.

<input type="password" class="form-control" formControlName="confirmedPassword"  title="Please re-enter your password" >
<!-- AND -->
<input type="password" class="form-control" formControlName="password" title="Please enter your password">

希望这可以帮助!

Answer 3

请在 Angular5 中更新如下所示的 FormGroup 代码

 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])
    }, this.pwdMatchValidator);

pwdMatchValidator在您的组件中添加功能

pwdMatchValidator(frm: FormGroup) {
    return frm.get('password').value === frm.get('confirmedPassword').value
       ? null : {'mismatch': true};
 }

在模板中添加验证消息

<span *ngIf="confirmedPassword.errors || signUpForm .errors?.mismatch">
              Password doesn't match
            </span>

请找到下面的角材料工作部件。

组件模板代码 password.component.html

 <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>

组件代码： password.component.ts

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;
    }

  }

}

Answer 4

验证器有两种类型：FormGroup验证器和FormControl验证器。要验证两个密码是否匹配，您必须添加一个FormGroup验证器。以下是我的示例：

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};
}

在庙宇中：

<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验证器添加为group方法的第二个参数。