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/Angular 7

AsyncValidatorFn

interface

A function that receives a control and returns a Promise or observable that emits validation errors if present, otherwise null.

interface AsyncValidatorFn {
  (control: AbstractControl): Promise<ValidationErrors | null> | Observable<ValidationErrors | null>
}

Methods

(control: AbstractControl): Promise<ValidationErrors | null> | Observable<ValidationErrors | null>

Parameters
control AbstractControl
Returns

Promise<ValidationErrors | null> | Observable<ValidationErrors | null>

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https://v7.angular.io/api/forms/AsyncValidatorFn