call method

  1. @override
String? call(
  1. String attribute,
  2. String value
)
override

Validates whether a numeric value falls within the specified range.

This method checks if the input value is a valid numeric representation and whether it falls within the specified range [min, max]. If the value is outside the range or not a valid number, an error message is generated using the buildMessage method.

Parameters:

  • attribute: The identifier of the form attribute being validated.
  • value: The value to be validated.

Returns: A validation error message if the value is outside the specified range or not a valid number, or null if the value is valid.

Implementation

@override
String? call(String attribute, String value) {
  if (value.isNotEmpty) {
    final parsedValue = num.tryParse(value);
    if (parsedValue == null ||
        !((parsedValue >= min) && (parsedValue <= max))) {
      return buildMessage(attribute, value, onExtra: (message) {
        message = message.replaceAll(":min", min.toString());
        message = message.replaceAll(":max", max.toString());
        return message;
      });
    }
  }
  return null;
}