MaxAgeValidator class

A validator that checks if the age calculated from the value date is less than or equal to maxAge.

The MaxAgeValidator can be used with FieldControllers holding values of type DateTime. It ensures that the calculated age does not exceed maxAge.

If the value is null, it is treated as valid by default.

Properties

• maxAge: The maximum allowed age calculated from the value date.
• message: An optional custom error message to display when invalid.

Example

FieldController<DateTime> field = FieldController(
  key: 'date',
  initialValue: DateTime(2025, 7, 12)
  validators: [MaxAgeValidator(18)],
);

// If field.value = DateTime(2000, 7, 12), validation fails.
// If field.value = DateTime(2010, 7, 12), validation passes.

See also

• FormyValidator, the base class for custom validators.
• ValidationResult, which describes the outcome of validation.
• FieldController, which holds the field value to be validated.