【问题标题】:Setting validators on formgroup在表单组上设置验证器
【发布时间】:2018-06-29 16:26:15
【问题描述】:

我查看了多个问题,所有答案都用于在表单组上设置验证器。我知道如何使用如下所示的表单生成器。

 this.userForm = this.fb.group({
  id: '',
  firstName: ['', [Validators.required]],
  lastName: ['', [Validators.required]],
  email: ['', [Validators.required]],
  phoneNumber: ['', [Validators.required]],
  jobTitle: ['', [Validators.required]],
  team: ['', [Validators.required]],
  passwords: this.fb.group({
    password: '',
    confirmPassword: ''
  },{
    validator: Validators.compose([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements])
  }),
  userValues: this.fb.array([])
});

现在我的组件有两种模式,添加和编辑。如果添加了模式,则密码控件应使用所需的验证器。我检查模式,如果它不在编辑模式下,我想更新密码表单组上的验证器以包含所需的验证器。我已经在 ngInit 事件中尝试过,如下所示。

 // if not edit mode then the password fields are required, so we overwrite the default validators.
if(!this.isEditMode)
{
  console.log("user form mode: " + this.isEditMode)
  const passwordForm = <FormGroup>this.userForm.controls['passwords'];

   // try to set the validators on the form group as a whole.
  passwordForm.setValidators([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements, Validators.required]);
  // try to set the password on the individual control.
  passwordForm.controls['password'].setValidators([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements, Validators.required]);

}

现在我第一次尝试更新表单组中的验证器一段时间没有任何区别。我们更新单个表单控件的第二次尝试导致我的验证器抛出异常。那么我是否可以将其应用于表单组而无需更改验证器的工作方式。验证器如下所示。

import { AbstractControl, ValidatorFn } from '@angular/forms';

export class PasswordValidators {

    static MatchPassword(AC: AbstractControl){
        let password = AC.get('password').value; // to get value in input tag
        let confirmPassword = AC.get('confirmPassword').value; // to get value in input tag

         if(!password || password == "")
         {
             return null;
         }

         if(password != confirmPassword) {
             AC.get('confirmPassword').setErrors( {MatchPassword: true} );
         } else {
             return null;
         }
    }

    // Ensures the password meets the minimum standard. Password should be at least 8 char, contain one numeric, one character, and one special character.
    static PasswordRequirements(AC: AbstractControl) {
        let password = AC.get('password').value;

        if(!password || password == "")
        {
            return null;
        }

        if(password != password.match("^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!@$%^&*-]).{8,}$")) {
            AC.get('password').setErrors({PasswordRequirements: true})
        } else {
            return null;
        }

    }
}

任何关于我如何实现这一目标的建议都会很棒。干杯。

【问题讨论】:

  • 您正在混合验证整个组的验证器(MatchPassword、PasswordRequirements),因此需要在组上设置,以及验证单个控件的验证器(Validators.required,它检查输入值不是 null 或空),因此必须在控件上设置。还不清楚为什么您没有从一开始就设置正确的验证器:您在创建表单组时已经知道组件的模式,不是吗?
  • 是的,我确实知道模式,但为了减少代码量,我不想有两个单独的表单定义。尽管现在听起来更容易使用该选项。感谢您对验证器的解释,过去几周我只使用 Angular,所以我还有很多东西要学。

标签: angular validation typescript angular-components angular-reactive-forms


【解决方案1】:

为了解决这个问题,因为我知道我的表单处于什么状态,我实际上只有两个不同的表单定义,如他的评论中提到的JB Nizet

它感觉像是最干净的解决方案,但对于这个用例来说它是有效的。

if(!this.isEditMode) {
  this.userForm = this.fb.group({
    id: '',
    firstName: ['', [Validators.required]],
    lastName: ['', [Validators.required]],
    email: ['', [Validators.required]],
    phoneNumber: ['', [Validators.required]],
    jobTitle: ['', [Validators.required]],
    team: ['', [Validators.required]],
    passwords: this.fb.group({
      password:  ['', Validators.required],
      confirmPassword:  ['', Validators.required]
    },{
      validator: Validators.compose([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements])
    }),
    userValues: this.fb.array([]),
    roles: []
  });
} else { 
  this.userForm = this.fb.group({
    id: '',
    firstName: ['', [Validators.required]],
    lastName: ['', [Validators.required]],
    email: ['', [Validators.required]],
    phoneNumber: ['', [Validators.required]],
    jobTitle: ['', [Validators.required]],
    team: ['', [Validators.required]],
    passwords: this.fb.group({
      password: '',
      confirmPassword: ''
    },{
      validator: Validators.compose([PasswordValidators.MatchPassword, PasswordValidators.PasswordRequirements])
    }),
    userValues: this.fb.array([]),
    roles: []
  });
}

【讨论】:

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