How to add "onchange" SimpleAttributeModifier to DropDownChoice in Apache Wicket

Question

I want to run a particular javascript when selection is changed in the drop down choice, so I added a simple attribute modifier like this :

ddc.add(new SimpleAttributeModifier("onchange", "calc();"));

But if I do this, it completely overrides the wicket onSelectionChanged() method. I need a way to perform both.

Thanks

Answer 1

You could use an AttributeAppender

ddc.add(new AttributeAppender("onchange", "calc();", " "));

The last argument is the separator used.