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https://issues.apache.org/jira/browse/WICKET-4576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285619#comment-13285619
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Lubos Racansky commented on WICKET-4576:
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Well, it is an enterprise legacy system, I cannot upgrade to 1.5.6
> 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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