在 Angular 8 Reactive FormBuilders 中将多个验证器存储到一个常量中 [英] Store Multiple Validators into a Constant in Angular 8 Reactive FormBuilders

问题描述

如何将多个验证器存储到一个常量中并在 Reactive FormBuilder 中使用?以下将应用 1 个验证器.存储和在 Angular 8 Reactive Formbuilder 中使用 Regex Const Validator

How do I store Multiple Validators into a Constant and use in Reactive FormBuilder? The following will apply 1 validator. Store and Use Regex Const Validator in Angular 8 Reactive Formbuilder

export const ZipValidation = Validators.pattern(/^\d{1,5}$/);

'ZipCode': [null, [Validators.maxLength(16), ZipValidation]],

我们需要将整个多数组存储到一个常量中.这是纬度和经度的多个验证器.

We need to store a whole multiple array into a constant. This is multiple validators for latitude and longitude.

Validators.maxLength(32),
Validators.min(-90),
Validators.max(90),
Validators.pattern(/^\d*\.?\d*$/)

我尝试了以下操作，它不起作用

I tried doing the following, it is not working

export const LatitudeLongitudeValidator = [Validators.maxLength(32),Validators.min(-90),Validators.max(90),Validators.pattern(/^\d*\.?\d*$/)];

'latitude': [null, [LatitudeLongitudeValidator]],

推荐答案

您可以拥有所有这些验证的数组，然后使用扩展运算符在验证器中使用该数组，

You can have array of all these validations and then using spread operator use that array inside validator,

export const CustomValidation = [
    Validators.maxLength(32),
    Validators.min(-90),
    Validators.max(90),
    Validators.pattern(/^\d*\.?\d*$/)
]

在表单组中使用这个数组，

Use this array in formgroup,

'formField': ['', [ ...CustomValidation ]],

展开运算符是数组变量之前的 3 个点....

Spread operator is 3 periods dots ... just before array variable.

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