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https://issues.apache.org/jira/browse/WICKET-4576?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov resolved WICKET-4576.
-------------------------------------
Resolution: Incomplete
Please try with 1.5.6 and attach a quickstart.
1.4.12 is too old.
> Wicket DropDownChoice - OnChangeAjaxBehavior does not react on select of
> nullSelection
> --------------------------------------------------------------------------------------
>
> Key: WICKET-4576
> URL: https://issues.apache.org/jira/browse/WICKET-4576
> Project: Wicket
> Issue Type: Bug
> Reporter: Lubos Racansky
>
> I use Wicket DropDownChoice with a nullSelection string (e.g. "Choose One").
> OnUpdate is not called when nullSelection is chosen.
> dropDown.add(new OnChangeAjaxBehavior() {
> @Override
> protected void onUpdate(AjaxRequestTarget target) {
> //some code
> }
> });
> dropDown.setNullValid(true);
> using Wicket 1.4.12
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