validate method

  1. @override
String? validate(
  1. String? value,
  2. bool required,
  3. Map<String, dynamic> data
)
override

Implementation

@override
String? validate(String? value, bool required, Map<String, dynamic> data) {
  if (value != null) {
    if (!required && value.isEmpty) {
      return null;
    }
    if (exact != null && value.length != exact!) {
      return short
          ? 'Need $exact characters'
          : 'Need exact $exact characters';
    }
    if (min != null && value.length < min!) {
      return short ? 'Need $min characters' : 'Longer than $min characters';
    }
    if (max != null && value.length > max!) {
      return short ? 'Only $max characters' : 'Lesser than $max characters';
    }
  }
  return null;
}