Validator class abstract

An interface to be implemented as classes acting as validators.

Usage

@Directive(
  selector: '[custom-validator]',
  providers: const [
    const ExistingProvider.forToken(
      NG_VALIDATORS,
      CustomValidatorDirective,
    ),
  ]
)
class CustomValidatorDirective implements Validator {
  @override
  Map<String, dynamic> validate(AbstractControl control) {
    // The length of the input string can't be longer than 14 characters.
    final value = c.value;
    if (value is String && value.length > 14) {
      return {
        'length': value.length,
      };
    }
    return null;
  }
}

Implementers

• MaxLengthValidator
• MinLengthValidator
• PatternValidator
• RequiredValidator

Constructors

Validator()

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(AbstractControl control) → Map<String, dynamic>?

Returns a map of the errors associated with this control.

Operators

operator ==(Object other) → bool

The equality operator.

inherited