Angular 9 References/ Forms

[maxlength] validation directive

This is the documentation for Angular 9.
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A directive that adds max length validation to controls marked with the maxlength attribute. The directive is provided with the NG_VALIDATORS multi-provider list.

Adding a maximum length validator

The following example shows how to add a maximum length validator to an input attached to an ngModel binding.

<input name="firstName" ngModel maxlength="25">