RequiredRule class

Rule to validate if the value is required.

Implemented types

• FormValidatorRule

Constructors

RequiredRule()

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

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

validate(String value) → String?

Returns ValidationMessages.requiredField if the value is empty, otherwise null.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited