validateHazardousMaterialsCode function

String? validateHazardousMaterialsCode(
  1. String? value
)

Validates Hazardous Materials Code. Returns null if valid, or an error message string if invalid.

Implementation

String? validateHazardousMaterialsCode(String? value) {
  if (value == null || value.isEmpty) {
    return 'Please enter a hazardous materials code';
  }
  // Hazardous materials codes vary; adjust validation as needed.
  return null;
}