Event Listener on OptionGroup Vaadin

[Hir O, modificado hace 12 años.]

Hi All,

I have an Vaadin OptionGroup, and I want an event listener which notifies me whenever the selection changes.
My code is as follows

[indent]
OptionGroup optGrpTaskAssign = new OptionGroup(PortletProps.get("TASK_ASSIGNMENT"));
Item itm1 = optGrpTaskAssign.addItem("Option 1");
Item itm2 = optGrpTaskAssign.addItem("Option 2);

optGrpTaskAssign.addListener(new ValueChangeListener() {
@Override
public void valueChange(ValueChangeEvent event) {
System.out.println("notify me");
}
});[/indent]

but this is not working. I want to get notified when user change selection from Option 1 to Option 2 or vice-versa.

Please help me with this

[Milen Dyankov, modificado hace 12 años.]

try this:

OptionGroup optGrpTaskAssign = new OptionGroup(PortletProps.get("TASK_ASSIGNMENT"));
Item itm1 = optGrpTaskAssign.addItem("Option 1");
Item itm2 = optGrpTaskAssign.addItem("Option 2);

[b]optGrpTaskAssign.setImmediate(true);[/b]
optGrpTaskAssign.addListener(new ValueChangeListener() {
@Override
public void valueChange(ValueChangeEvent event) {
System.out.println("notify me");
}
});

[David H Nebinger, modificado hace 12 años.]

Milen is right, you're missing the optGrpTaskAssign.setImmediate(true); method call.

setImmediate(true) indicates your code should be invoked immediately when it is changed in the browser; if not immediate, it will wait until some other point in the future (another component is immediate, user clicks a button, etc.).

Not all controls should be immediate, and you should choose wisely determining when to turn them immediate.

[Hir O, modificado hace 11 años.]

thnx Milan & David.

One more thing. How to make one option selected??

Can you suggest me a good book for the references of vaadin?

[Milen Dyankov, modificado hace 11 años.]

Hir O:

One more thing. How to make one option selected??

If I remember right, this should work:

optGrpTaskAssign.setValue(itm1);

Hir O:

Can you suggest me a good book for the references of vaadin?

Try "Book of Vaadin" - http://vaadin.com/book