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> }
call signature | |||
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|
control | AbstractControl |
Promise<ValidationErrors | null> | Observable<ValidationErrors | null>
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Licensed under the Creative Commons Attribution License 4.0.
https://v10.angular.io/api/forms/AsyncValidatorFn