IsRequired<T> class

A validator that checks if the value is not null, empty nor false.

The IsRequired can be used with FieldControllers holding values of types String, Iterable, Map or bool. It ensures that the value is not null, empty nor false.

Properties

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

Example

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

// If field.value = null, validation fails.
// If field.value = '', validation fails.
// If field.value = 'Ana', 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.