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This is the archived documentation for Angular v17. Please visit angular.dev to see this page for the current version of Angular.

ValidatorFn

A function that receives a control and synchronously returns a map of validation errors if present, otherwise null.

      
      interface ValidatorFn {
(control: AbstractControl<any, any>): ValidationErrors | null }

Methods

      
      (control: AbstractControl<any, any>): ValidationErrors | null
    
Parameters
control AbstractControl<any, any>
Returns

ValidationErrors | null