BetweenLengthValidator<T> class
A validator that checks if the length of a value is between minLength and maxLength.
The BetweenLengthValidator can be used with FieldControllers holding
values of types String, List, Map or Set. It ensures that the
length is between minLength and maxLength.
If the value is null it is treated as valid by default.
Properties
- minLength: The minimum allowed length for the value.
- maxLength: The maximum allowed length for the value.
- message: An optional custom error message to display when invalid.
Example
FieldController<String> field = FieldController(
key: 'name',
validators:[BetweenLengthValidator(minLength:4, maxLength:6)],
);
// If field.value = 'Ana', validation fails.
// If field.value = 'João Pedro', validation fails.
// If field.value = 'Maria', 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.
- Inheritance
-
- Object
- FormyValidator<
T> - BetweenLengthValidator
Constructors
- BetweenLengthValidator.new({String? message, required int minLength, required int maxLength})
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- maxLength → int
-
The maximum allowed length for the value.
final
- message → String?
-
finalinherited
- minLength → int
-
The minimum allowed length for the value.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
call(
FieldController< T> controller) → ValidationResult -
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
onValidate(
FieldController< T> controller) → ValidationResult -
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited