MinLengthValidator
directive
A directive that adds minimum length validation to controls marked with the minlength
attribute. The directive is provided with the NG_VALIDATORS
multi-provider list.
See also
NgModules
-
ReactiveFormsModule
-
FormsModule
Selectors
[minlength][formControlName]
[minlength][formControl]
[minlength][ngModel]
Properties
Property | Description |
---|---|
number | Tracks changes to the the minimum length bound to this directive. |
Description
Adding a minimum length validator
The following example shows how to add a minimum length validator to an input attached to an ngModel binding.
<input name="firstName" ngModel minlength="4">
Methods
ngOnChanges() | |||
---|---|---|---|
A lifecycle method called when the directive's inputs change. For internal use only. | |||
ngOnChanges(changes: SimpleChanges): voidParameters
Returns
|
validate() | |||
---|---|---|---|
Method that validates whether the value meets a minimum length requirement. Returns the validation result if enabled, otherwise null. | |||
validate(control: AbstractControl): ValidationErrors | nullParameters
Returns
|
registerOnValidatorChange() | |||
---|---|---|---|
Registers a callback function to call when the validator inputs change. | |||
registerOnValidatorChange(fn: () => void): voidParameters
Returns
|
© 2010–2020 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
https://v9.angular.io/api/forms/MinLengthValidator