EvenNumValidator class

A validator that checks if the value is even.

The EvenNumValidator can be used with FieldControllers holding values of type int. It ensures that the value is even.

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

Properties

• message: An optional custom error message to display when invalid.

Example

FieldController<int> field = FieldController(
  key: 'number',
  validators:[EvenNumValidator()],
);

// If field.value = 3, validation fails.
// If field.value = 2, validation passes.
// If field.value = 4, 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.