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.
[minlength][formControlName][minlength][formControl][minlength][ngModel]| Property | Description |
|---|---|
@Input()minlength: string | number | null | Tracks changes to the minimum length bound to this directive. |
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">
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https://angular.io/api/forms/MinLengthValidator