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https://issues.apache.org/jira/browse/WICKET-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732847#action_12732847
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Juergen Donnerstag commented on WICKET-2376:
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please provide a quickstart or junit test case. Thanks
> In some cases,
> org.apache.wicket.extensions.markup.html.repeater.data.table.NavigatorToolbar
> is not displayed even when there are multiple pages in the DataTable it is
> attached to
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: WICKET-2376
> URL: https://issues.apache.org/jira/browse/WICKET-2376
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4-RC7
> Environment: Windows Vista, JDK 6 Update 14
> Reporter: Vikash Madhow
>
> The following can recreate the problem:
> 1. Create a DataTable with a NavigationToolbar and a page length less than
> what the data provider will return, i.e., the data table will have more than
> one page initially.
> 2. Add two buttons to the page; the first one, when submitted, will change
> the criteria of the data provider to return less rows than what can be
> displayed in one page of the DataTable and reload the page, i.e., after
> pressing the button, the page will be reloaded with the datatable having only
> one page and, therefore, the NavigationToolbar will not be visible anymore.
> 3. The second button will change the criteria of the data provider back to
> what it was originally, i.e., it will have more rows than can be displayed in
> one page of the DataTable, and reload the page. At that point, the
> NavigationToolbar should be shown again, but it isn't.
> I've found that the bug is due to the fact that the onBeforeRender() method
> of NavigationToolbar which have the following line for determining visibility
> of the toolbar:
> setVisible(table.getPageCount() > 1);
> is not called when the 2nd button is pressed in the above scenario.
> I've been able to work-around this problem by subclassing NavigationToolbar
> and overidding isVisible() method (which is called many times however, and
> might cause some performance problems) and added the above line of code as
> such:
> @Override
> public boolean isVisible()
> {
> return getTable().getPageCount() > 1;
> }
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