ValidatorGroup<T extends Object> class

Groups several validators of the same type T and runs them in order.

By default it behaves like a short-circuiting form validator: it returns the error of the first validator that fails, or null when every validator passes. Use errors when you need every failing message at once. Build one directly or with the & operator.

const password = ValidatorGroup([
  RequiredValidator(error: 'Required'),
  MinLengthValidator(min: 8, error: 'At least 8 characters'),
  HasUppercaseValidator(error: 'Add an uppercase letter'),
]);

password('abc');       // 'At least 8 characters'
password.errors('abc'); // ['At least 8 characters', 'Add an uppercase…']
password('Abcdefghi'); // null

Constructors

ValidatorGroup(List<Validator<T>> validators)

Constructs a group from the given validators.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

validators → List<Validator<T>>

The validators applied to the value, in order.

final

Methods

call(T? value) → String?

Returns the error of the first failing validator, or null if the value satisfies every validator.

errors(T? value) → List<String>

Runs every validator and returns the errors of all that failed.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator &(Validator<T> other) → ValidatorGroup<T>

Appends other to this group, returning a new ValidatorGroup.

operator ==(Object other) → bool

The equality operator.

inherited