BeforeDateValidator class

A validator that checks if the value date is less than date.

The BeforeDateValidator can be used with FieldControllers holding values of type DateTime. It ensures that the value is less than date.

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

Properties

• date: The date the value must be strictly less than.
• message: An optional custom error message to display when invalid.

Example

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

// If field.value = DateTime(2025, 7, 13), validation fails.
// If field.value = DateTime(2025, 7, 12), validation fails.
// If field.value = DateTime(2025, 7, 11), 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<DateTime>
• BeforeDateValidator

Constructors

BeforeDateValidator(DateTime date, {String? message})

Properties

date → DateTime

The date the value must be strictly less than.

final

hashCode → int

The hash code for this object.

no setter, inherited

message → String?

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

call(FieldController<DateTime> controller) → ValidationResult

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

onValidate(FieldController<DateTime> controller) → ValidationResult

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited