JSTL c:if tag (via facelets) doesn't work correct in rich:da

[mkuehle]

Hi,

i need to use c:if within a rich:dataTable component. I work with facelets so normally allows it to use c:if. But within a rich:dataTabel and rich:dataGrid it doesn't work.

<rich:dataTable id="myList" rows="10" var="item" value="#{MyBB.resultList}">
 <rich:column>
 <c:if test="#{empty item.url}">no url</c:if>
 </rich:column>
</rich:dataTable>

In this example code above the string "no url" should be only printed out if no url is given. But it doesn't matter whether the url is null or not. The String will be created for every row.

Outside these components c:if does work as expected.
Is this behaviour normal or is it a bug?

Thank's a lot!

[mkuehle]

I forgot to say that there is a workaround for this special case wich works fine:

<rich:column>
 <h:panelGroup rendered="#{empty item.url}">no url</h:panelGroup>
</rich:column>

But i had also more than once the case that there was no workaround available and i had to build my own component.

[liuliu]

i think because <c:if is build-time tag, item.url is null when building the page.

[mkuehle]

I found the answer - the reason is indeed the differend times: build time and render time.

Here the anwser from facelets faq: http://wiki.java.net/bin/view/Projects/FaceletsFAQ#Why_doesn_t_my_c_if_ui_repeat_ui