requiredValidator function

String? Function(String?) requiredValidator(
  1. String fieldName
)

Validator functions for FormField validation. Validates that the value is not empty.

Implementation

/// Validates that the value is not empty.
String? Function(String?) requiredValidator(String fieldName) {
  return (value) {
    if (value == null || value.trim().isEmpty) {
      return '$fieldName is required';
    }
    return null;
  };
}