MinLengthValidator
directive
A directive that adds minimum length validation to controls marked with the minlength attribute. The directive is provided with the NG_VALIDATORS mult-provider list.
See also
NgModules
Selectors
[minlength][formControlName][minlength][formControl][minlength][ngModel]
Properties
| Property | Description |
|---|---|
@Input()minlength: string |
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. |
|||
|
changes |
SimpleChanges |
A object of key/value pairs for the set of changed inputs. |
Returns
void
|
validate()
|
|||
|---|---|---|---|
Method that validates whether the value meets a minimum length requirement. Returns the validation result if enabled, otherwise null. |
|||
|
control |
AbstractControl |
Returns
ValidationErrors | null
|
registerOnValidatorChange()
|
|||
|---|---|---|---|
Registers a callback function to call when the validator inputs change. |
|||
|
fn |
() => void |
The callback function |
Returns
void
© 2010–2019 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/forms/MinLengthValidator