如何检查Angular / Ionic中的两个字段是否相等？

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，我正在这样做，问题是它无法获取字段的值，它显示为 null，因为我可以正确动态地获取值吗？

我的表单生成器，我正在使用匹配功能来检查手机和确认字段。

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

您需要创建一个自定义 formGroup 验证器来检查表单控件值的值并检查主题

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??

Answer 2

我会使用 root 属性来访问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：你想将它用于任何领域，所以让我们让它通用

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

你可以这样试试。

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');
}