requiredTrue method

FormFieldValidator requiredTrue ({String errorText: "This field must be set to true" })

FormFieldValidator that requires the field's value be true. Commonly used for required checkboxes.

Implementation

static FormFieldValidator requiredTrue({
  String errorText = "This field must be set to true",
}) {
  return (val) {
    if (val != true) {
      return errorText;
    }
  };
}