FormController class - form_controller library

Manages form validation and input formatting for a specific form.

validator: A function that validates input values. Returns a string error message or null for valid input.
regexFilter: A regular expression that defines allowed characters for input validation.
formatters: A list of string masks used to format input strings, such as phone numbers or dates.
textInputType: Specifies the type of keyboard input for text fields, such as email address, phone number, or regular text. Example usage:

class MyFormController extends FormController {
  // Example: Define a validator function
  @override
  String? Function(String? value)? get validator => (value) {
    if (value == null || value.isEmpty) {
      return 'This field cannot be empty';
    }
    return null; // Valid input
  };

  // Example: Define a regular expression filter
  @override
  RegExp get regexFilter => RegExp(r'[a-zA-Z0-9]');

  // Example: Define a list of formatters for input masking
  @override
  List<String> get formatters => [
    "(##) ####-####", // Example phone number mask
  ];

  // Example: Define the type of keyboard input for text fields
  @override
  TextInputType? get textInputType => TextInputType.number;
}

Properties