Posted under JSF
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Tags Bug, Gotcha, JSF, Primefaces, Tip
This issue was encountered under Primefaces 2.2.1 – other versions have not been tested for this. In certain cases it is possible for the panel component to not render the title bar at all.
When this happens, the content is rendered assuming the panel is expanded, but the panel bar itself does not render, and crucially, there is therefore no access to the expand/collapse icon as it is not rendered. Other components can expand/collapse the panel via its widget however.
This is caused when there is neither a header attribute present nor a header facet present. If one or other (or both) are present, the panel title bar does render. Note that the behaviour occurs even if toggleable is set to true.
This behaviour is undocumented and is rather a gotcha when you hit it, as it seems indicative of something more serious.
The solution is straightforward however – you must provide either the header attribute or a header facet in order for the panel component itself to render correctly.
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