ContainsValidator<T> class

A validator that checks if the value contains contain.

The ContainsValidator can be used with FieldControllers holding values of types String, Iterable or Map. It ensures that the value contains contain.

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

Properties

• contain: The value that the field should contain.
• message: An optional custom error message to display when invalid.

Example

FieldController<int> field = FieldController(
  key: 'name',
  validators:[ContainsValidator('Hello')],
);

// If field.value = 'Bye World :( )', validation fails.
// If field.value = 'Hello World :) )', 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.