PositiveNumValidator class

A validator that checks if the value is positive.

The PositiveNumValidator can be used with FieldControllers holding values of types int or double. It ensures that the value is positive.

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:[PositiveNumValidator()],
);

// If field.value = -3, validation fails.
// If field.value = 3, 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.