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if the textbox's value don't match its constriant properties
the textbox will show a errormessage right of it.
when i do something else
just like checking user's input in the database
can i show a error message like this?
You can have your own implementation of Constraint:
public class MyConstraint implements Constraint,
java.io.Serializable {...and override the validate method:
@Override
public void validate(Component comp, Object value)
throws WrongValueException {
if (comp instanceof Textbox) {
String enteredValue = (String) value;
if (!enteredValue.isEmpty()) {
//your logic here
} else {
throw new WrongValueException(comp, "Your wrong value label here");
}
}
}
then set your Constraint to the textbox: tb.setConstraint(new MyConstraint());
Asked: 2011-10-08 04:48:59 +0800
Seen: 290 times
Last updated: Oct 08 '11