MaxLengthValidator<T> class

A validator that checks if the length of a value is equal or less than maxLength.

The MaxLengthValidator can be used with FieldControllers holding values of types String, List, Map or Set. It ensures that the length is equal or less than maxLength.

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

Properties

• maxLength: The maximun allowed length for the value.
• message: An optional custom error message to display when invalid.

Example

FieldController<String> field = FieldController(
  key: 'name',
  validators:[MaxLengthValidator(6)],
);

// 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>
• MaxLengthValidator

Constructors

MaxLengthValidator(int maxLength, {String? message})

Properties

hashCode → int

The hash code for this object.

no setter, inherited

maxLength → int

The maximun allowed length for the value.

final

message → String?

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

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