Wicket, how to lazy-load DropDown choices on click?

Question

I have a lot of DropDownChoice components with many items in a form, and on loading the form, I'd like to display only the saved selected options. When the user clicks on a DropDownChoice, I'd like to ajax-load the full item list on the fly.

Can this be done?

Answer 1

Add a OnChangeAjaxBehavior to your dropdown-component. Override the onUpdate-method and add another component to the target. The chosen value of the dropdown-component is inside its model.

Update: Okey, I think I know what you're trying to achieve. Add an AjaxFormComponentUpdatingBehavior to your dropdown component with "onclick" as constructor parameter. Override the onUpdate-method and add your dropdown component to the target. Before you do that, update the dropdown model, so that it now contains all values.