Question

我想检查两个字段的值是否相同，这些字段必须通过参数传递给验证函数，我这样做是，问题是它无法获取该字段的值，出现为空，因为我可以正确，动态地获取值吗？

我的表单生成器，我正在使用match函数来检查cell_phone和确认字段。

this.recharge = this.formBuilder.group({
  cell_phone: ['', Validators.required, Validations.match('cell_phone', 'cell_phone_confirmation')],
  cell_phone_confirmation: ['', [Validators.required]],
  value: ['', Validators.required],
  operator_id: ['', Validators.required]
});

在我的函数中，控制台日志为空：

static match(field1: string, field2: string){
  return (group: FormGroup) => {
    console.log(group.get(field1));
  }
}

Answer 1

您可以尝试这样。

this.recharge = this.formBuilder.group({
  cell_phone: ['', Validators.required],
  cell_phone_confirmation: ['', [Validators.required]],
  value: ['', Validators.required],
  operator_id: ['', Validators.required]
},{ validator:  Validations.match });

static match(c: AbstractControl){
  const cellphone = c.get('cell_phone');
  const cellphoneconfirm = c.get('cell_phone_confirmation');
}

Answer 2

我将使用root属性访问cell_phone_validator控件

cell_phone: ['', [Validators.required, this.cellPhoneValidator]]


private cellPhoneValidator(control: AbstractControl) {
  if (control.root.get('cell_phone_confirmation') {
    return control.root.get('cell_phone_confirmation').value !== control.value ?
      { cellPhoneValidator: { value: control.value } } : null;
  }

}

编辑：，您想将其用于任何字段，所以让它变得通用

cell_phone: ['', [Validators.required, Validations.matchValidator('cell_phone_confirmation')]],
cell_phone_confirmation: ['', [Validators.required, Validations.matchValidator('cell_phone')]]

private matchValidator(controlValidationName: string): ValidatorFn {
  return (control: AbstractControl) => {
    const controlValidation = control.root.get(controlValidationName);
    if (!controlValidation) {
      return null;
    }
    return controlValidation.value !== control.value ?
      { matchValidator: { value: control.value } } : null;
  }
}

Answer 3

您需要创建一个自定义的formGroup验证器，以检查表单控件的值并检查主题

this.recharge = formBuilder.group({
  cell_phone: ['', Validators.required],
  cell_phone_confirmation: ['', Validators.required],
},
  {
    validator: checkMatchValidator('cell_phone', 'cell_phone_confirmation')
  }
);

自定义验证器功能

export function checkMatchValidator(field1: string, field2: string) {
  return function (frm) {
    let field1Value = frm.get(field1).value;
    let field2Value = frm.get(field2).value;

    if (field1Value !== '' && field1Value !== field2Value) {
      return { 'notMatch': `value ${field1Value} is not equal to ${field2}` }
    }
    return null;
  }
}

stackblitz demo

如何检查两个字段在Angular / Ionic中是否相等？

3 个答案: