Question

我在Angular 4项目中使用自定义验证器，当我想要更改密码时，我有一个包含2个字段的弹出窗口：password和confirmpassword。在这种情况下，两个字段都是必需的，当用户删除某些字段的内容时，正确显示错误消息，字段变为红色。但是如果密码不匹配，如何使字段无效（使用ng-invalid / has-error将字段变为红色）

equalValidator.ts

import {Directive, forwardRef, Attribute} from '@angular/core';
import {Validator, AbstractControl, NG_VALIDATORS} from '@angular/forms';

@Directive({
  selector: '[validateEqual][formControlName],[validateEqual][formControl],[validateEqual][ngModel]',
  providers: [
    {provide: NG_VALIDATORS, useExisting: forwardRef(() => EqualValidator), multi: true}
  ]
})
export class EqualValidator implements Validator {
  constructor( @Attribute('validateEqual') public validateEqual: string,
    @Attribute('reverse') public reverse: string) {

    console.log('Sono in validator')
  }

  private get isReverse() {
    if (!this.reverse) return false;
    return this.reverse === 'true' ? true : false;
  }

  validate(c: AbstractControl): {[key: string]: any} {
    // self value
    let v = c.value;

    // control vlaue
    let e = c.root.get(this.validateEqual);

    // value not equal
    if (e && v !== e.value && !this.isReverse) {
      return {
        validateEqual: false
      }
    }

    // value equal and reverse
    if (e && v === e.value && this.isReverse) {
      delete e.errors['validateEqual'];
      if (!Object.keys(e.errors).length) e.setErrors(null);
    }

    // value not equal and reverse
    if (e && v !== e.value && this.isReverse) {
      e.setErrors({
        validateEqual: false
      })
    }

    return null;
  }
}

password.html

<form #modelForm="ngForm">  <div class="form-group">
      <label for="">Password</label>
      <input type="password" class="form-control" name="password" [ngModel]="password" 
        required validateEqual="confirmPassword" reverse="true" #password="ngModel">
      <small [hidden]="password.valid || password.pristine" class="text-danger">
        Password is required
      </small>

    </div>
    <div class="form-group">
      <label for="">Retype password</label>
      <input type="password" class="form-control" name="confirmPassword" [ngModel]="confirmPassword" 
        required validateEqual="password" reverse="false" #confirmPassword="ngModel">
      <small [hidden]="confirmPassword.valid || confirmPassword.pristine " class="text-danger">
        Password mismatch
      </small>

    </div> </form> <p-footer>    <div class="ui-dialog-buttonpane ui-helper-clearfix">  <button class="btn btn-success"         (click)="updatePassword(modelForm, oldPassword.value, password.value, confirmPassword.value)"       [disabled]="((modelForm.form.invalid || modelForm.form.pristine)|| (password.value != confirmPassword.value))">         <span class="btn-label"> <i class="material-icons">check</i>        </span> {{'changepassword.buttons.update' |translate }}     </button> </div>

Answer 1

使用反应形式

RLocalCachedMap

这个我如何创建FormGroup。

this.passwordForm = this.fb.group({
    password: [ '', [ Validators.required] ],
    passwordConfirm: [ '', Validators.required ]
}, { validator: this.areEqual });

这是验证匹配的方法

然后在模板中你可以使用

private areEqual(group: FormGroup) {
    return group.get('password').value === group.get('passwordConfirm').value ? null : { mismatch: true };
}

希望它会有所帮助

Answer 2

您可以使用ngClass为bootstrap 4添加bootstrap has-danger类，或者根据验证期间设置的属性为先前版本添加has-error。

我已经简化了你的代码以使实现更加清晰：

  <div class="form-group" [ngClass]="{'has-danger': passwordError}">
    <label class="form-control-label">danger</label>
    <input type="password" class="form-control" name="password"
    required validateEqual="confirmPassword" reverse="true">
  </div>

这是一个完整实施的工作人员：https://plnkr.co/edit/MbrFdbd8SVjAhQp3XOOY

自定义验证器角度4

2 个答案: