call method

@override String? call(String attribute, String value)

Validates whether a value is less than or equal to the specified number.

This method checks if the input value is less than or equal to the provided number. If the value is greater than the 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 not less than or equal to the specified 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 <= number)) {
      return buildMessage(attribute, value, onExtra: (message){
        message.replaceAll(':number', number.toString());
        return message;
      });
    }
  }
  return null;
}