AccordionPanel add error

[scaswell1]

Hello,

When attempting to add a ContentPanel to an AccordionLayoutContainer, I get the following error:

java.lang.AssertionError: Method must be called before the widget is rendered
	at com.sencha.gxt.widget.core.client.Component.assertPreRender(Component.java:1197)
	at com.sencha.gxt.widget.core.client.ContentPanel.setCollapsible(ContentPanel.java:543)
	at com.sencha.gxt.widget.core.client.container.AccordionLayoutContainer.onInsert(AccordionLayoutContainer.java:305)
	at com.sencha.gxt.widget.core.client.container.Container.insert(Container.java:400)
	at com.sencha.gxt.widget.core.client.container.InsertResizeContainer.insert(InsertResizeContainer.java:27)
	at com.sencha.gxt.widget.core.client.container.Container.add(Container.java:88)

It seems that when adding a child to an AccordionLayoutContainer, the add method makes sure the child is collapsible, which is apparently only allowed during pre-render. This severely inhibits the ability to add items to an accordion layout container dynamically. Any hints?

[sven]

Is it possible that your ContentPanel was already used somewhere else before and so it was already attached once?

Currently there is a check in place for this. However in GXT 3 this also might be possible to be a runtime change that should always be possible. I will move this thread to the bugs forum for investigation.

[scaswell1]

Hi Sven,

I am sure that the ContentPanels being added are brand-new.
Pseudo code for my use case is as follows:

Viewport v = new Viewport();
v.setWidget(new BorderLayoutContainer());
v.getWidget().setWestWidget(new AccordionLayoutContainer());
RootPanel.get().add(viewport);

// ... some processing goes on ...

for (some_item in some_list) {
     ContentPanel newPane = ... // processing of some_item results in a new panel
    v.getWidget().getWestWidget().add(newPane);
}

I can try to make a testcase for you at some point today, if you would like.

[sven]

OK, as workaround, can you try to add the viewport after your precessing?

[scaswell1]

Yeah, if I add the panels before adding the Viewport to the RootPanel, everything works fine. It was just inconvenient, not as much as a show stopper (in this use-case, anyway.)