Helpers

Validasi provides a few helper classes to help you for Flutter Development.

FieldValidator

The FieldValidator is a class that can be used to validate a single schema. This class is useful since you can get first error message from the schema directly.

import 'package:validasi/validasi.dart';

final schema = Validasi.string().minLength(3);

TextFormField(
    validator: FieldValidator(schema).validate,
);

INFO

For asyncronous validation, you can use validateAsync method instead.

GroupValidator

The GroupValidator is a wrapper around the FieldValidator that can be used to nicely grouped some schema together. This class is useful when you have multiple schema and you want to place them in one place.

import 'package:validasi/validasi.dart';

final schema = GroupValidator({
    'name': Validasi.string().minLength(3),
    'email': Validasi.string().email(),
});

TextFormField(
    validator: schema.using('name').validate,
);

TextFormField(
    validator: (value) => schema.using('email').validate,
);

INFO

For asyncronous validation, you can use validateAsync method instead.

With mapped values

You can also use GroupValidator with mapped values. This is useful when you want to validate a group of values at once and you want to use the mapped values as the key.

import 'package:validasi/validasi.dart';

final schema = GroupValidator({
    'name': Validasi.string().minLength(3),
    'email': Validasi.string().email(),
});

final values = {
    'name': 'John Doe',
    'email': 'john@example.com',
};

schema.validateMap(values); // validateMap and validateMapAsync

WARNING

Mapped Based Validation is strict. Which means your value should match the key in the schema. If you have a schema with name and email, but your value only has name, it will throw an error.

Customizing The Path Error Message

You can customize the path error message by passing the path parameter to the FieldValidator or GroupValidator:

import 'package:validasi/validasi.dart';

FieldValidator(Validasi.string(), path: 'Custom Path').validate('Invalid Value');
GroupValidator({
    'name': Validasi.string().minLength(3),
    'email': Validasi.string().email(),
}).on('name', path: 'Custom Path').validate('Invalid Value');