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Vaadin Forum3. Vaadin 6, 7, 8

ComboBox selection change event ?

Peter Hansson
7 years ago Feb 20, 2016 12:19am

I would like to give the user a warning (and a chance to confirm) when he changes the value of a ComboBox (in single-select mode). This applies only to changes via the GUI, it shouldn't fire for programmatic changes to the selection.

The ValueChange event happens after the change has been carried out so I guess I cannot use that one.

How can I accomplish this ?   I'm thinking I need to subclass ComboBox and override something (perhaps setInternalValue() ?) but I'm not quite sure how to distinguish GUI changes to the value from programmatic changes to the value. Also not sure this is the correct path ?

 

Shaun Wallace
7 years ago Feb 20, 2016 11:35pm

You could still use the ValueChange.  Why not just permantly store the previous value?  And then compare and prompt the user.  If they do want to confirm then set the value of the combobox to the old stored value?

Peter Hansson
7 years ago Feb 21, 2016 10:36am

 

Shaun Wallace: You could still use the ValueChange.  Why not just permantly store the previous value?  And then compare and prompt the user.  If they do want to confirm then set the value of the combobox to the old stored value?
 

Yeah, thanks. That's what I ended up doing.