spread.options.highlightInvalidData = true;
var dv = GC.Spread.Sheets.DataValidation.createListValidator("1,2,3");
dv.showInputMessage(true);
dv.inputMessage("Value must be 1, 2 or 3.");
dv.inputTitle("tip");
activeSheet.setDataValidator(1, 1, 1, 1, dv, GC.Spread.Sheets.SheetArea.viewport); 
alert(dv.type());

var textLengthCondition = new GC.Spread.Sheets.ConditionalFormatting.Condition(GC.Spread.Sheets.ConditionalFormatting.ConditionType.textLengthCondition);
textLengthCondition.compareType(GC.Spread.Sheets.ConditionalFormatting.GeneralComparisonOperators.greaterThan);
textLengthCondition.formula("$C$1"); // formula used to calculate a number.
var validator = new GC.Spread.Sheets.DataValidation.DefaultDataValidator(textLengthCondition);
validator.type(GC.Spread.Sheets.DataValidation.CriteriaType.custom);
activeSheet.getCell(0, 0, GC.Spread.Sheets.SheetArea.viewport).validator(validator);
spread.options.highlightInvalidData = true;
activeSheet.setValue(0, 0, "abcf");
 
//Set value 3 to $C$1, after this code, the value in Cell(0,0) is valid.
activeSheet.setValue(0, 2, 3);
//Set value 5 to $C$1, after this code, the value in Cel(0,0) is invalid.
// activeSheet.setValue(0, 2, 5);