LengthValidator class

A validator that checks if a string's length is within specified bounds.

LengthValidator validates that a string's length falls within the minimum and/or maximum bounds. Either bound can be null to check only one direction.

Example:

LengthValidator(
  min: 3,
  max: 20,
  message: 'Must be between 3 and 20 characters',
)
Inheritance

Constructors

LengthValidator({int? min, int? max, String? message})
Creates a LengthValidator with optional min/max bounds.
const

Properties

hashCode → int
The hash code for this object.
no setteroverride
max → int?
Maximum length requirement (inclusive), or null for no maximum.
final
message → String?
Custom error message, or null to use default localized message.
final
min → int?
Minimum length requirement (inclusive), or null for no minimum.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

combine(Validator<String> other) → Validator<String>
Combines this validator with another validator using AND logic.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
shouldRevalidate(FormKey source) → bool
Determines if this validator should be re-run when the specified form key changes.
inherited
toString() → String
A string representation of this object.
inherited
validate(BuildContext context, String? value, FormValidationMode state) → FutureOr<ValidationResult?>
Validates the given value and returns a validation result.
override

Operators

operator &(Validator<String> other) → Validator<String>
Combines this validator with another using AND logic (alias for combine).
inherited
operator +(Validator<String> other) → Validator<String>
Combines this validator with another using AND logic (alias for combine).
inherited
operator ==(Object other) → bool
The equality operator.
override
operator unary-() → Validator<String>
Negates this validator's result (alias for ~ operator).
inherited
operator |(Validator<String> other) → Validator<String>
Combines this validator with another using OR logic.
inherited
operator ~() → Validator<String>
Negates this validator's result.
inherited