haveUnicode static method

FormFieldValidator<String> haveUnicode({
  1. String errorText = "This field have unicode.",
})

A FormFieldValidator that rejects unicode input, for fields that must stay ASCII-only (e.g. usernames, codes).

Implementation

static FormFieldValidator<String> haveUnicode({
  String errorText = "This field have unicode.",
}) {
  return (value) {
    if (isUnicode(value)) return errorText;
    return null;
  };
}