Very simple and light form validation assistant.

Use your own validation functions with great convenience.

Features

• Very simple.
• Very light.
• Zero dependencies.

Getting started

    flutter pub get validation_assistant

or

  dependencies:
    validation_assistant: 1.1.2

Usage

final validationAssistant = ValidationAssistant();

...

// with default messages
TextFormField(
  ...
  validator: validationAssistant
    ..required()
    ..maxLength(10)
    ..regExp(r'^\d+$')
)

// with custom messages.
TextFormField(
  ...
  validator: validationAssistant
    ..required('custom error message')
    ..maxLength(10, 'custom error message')
    ..regExp(r'^\d+$', 'custom error message')
)

You can add your own function to check.

final validationAssistant = ValidationAssistant();

...
    
final String? customValidationFunction(String? value) {
  if (value < 5) {
    return 'custom error message';  
  }
  return null;
}

...

TextFormField(
  ...
  validator: validationAssistant
    ..required('custom error message')
    ..add(customValidationFunction)
)