ExactLengthValidator<T> class
A validator that checks if the length of a value is equal to exactLength.
The ExactLengthValidator can be used with FieldControllers holding
values of types String, List, Map or Set. It ensures that the
length is equal to exactLength.
If the value is null it is treated as valid by default.
Properties
- exactLength: The exact allowed length for the value.
- message: An optional custom error message to display when invalid.
Example
FieldController<String> field = FieldController(
key: 'name',
validators:[ExactLengthValidator(3)],
);
// If field.value = 'Maria', validation fails.
// If field.value = 'João Pedro', validation fails.
// If field.value = 'Ana', 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> - ExactLengthValidator
Constructors
- ExactLengthValidator(int exactLength, {String? message})
Properties
- exactLength → int
-
The exact allowed length for the value.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- message → String?
-
finalinherited
- 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