how to display h:panelGroup based on a condition

Question

In my problem, I have to display h:panelGroup based on a condition. For this h:panelGroup, the rendered attribute has already been set.

 <h:panelGroup rendered="#{not empty program.categories}">
    <li>
        <strong>Category: </strong> 
        <h:outputLabel value="#{not empty program.categories ? 'A':'N/A'}"/>
    </li>
 </h:panelGroup>

now I am trying to keep a condition like the code below:

<c:if test="${program.distTypeName != 'X' || program.distTypeName != 'Y' || program.distTypeName != 'Z'}">

<h:panelGroup rendered="#{not empty program.categories}">
    <li>
        <strong>Category: </strong> 
        <h:outputLabel value="#{not empty program.categories ? 'A':'N/A'}" />
    </li>
</h:panelGroup>

but this is not working. Please tell me what I am doing wrong. Basically, if the disType is not in x,y,z then I need to display the h:panelGroup.

How do we test not in condition with jstl tags? Thanks in advance.

This [link](http://stackoverflow.com/questions/4870462/conditionally-displaying-jsf-components/4870557#4870557) will help you. — danRod, Jul 10 '13 at 19:59
but how can use rendered atrribute in my scenario.. is not working..i should check condition only for this h:panelGroup..not for the entire form. please suggest. — sahithi, Jul 11 '13 at 02:37
Provided that `distTypeName` is an enum or a string, the code posted so far is perfectly legit when considered standalone (e.g. when that's the sole content of ``). Isn't that code *actually* inside an `` or `` or so? If so, then this question duplicates http://stackoverflow.com/questions/3442380/jstl-cif-inside-a-jsf-hdatatable Please take that into account in your future questions (the code posted so far should reproduce the problem when interpreted as the sole content of ``). See also http://stackoverflow.com/tags/jsf/info — BalusC, Jul 11 '13 at 16:11

score 0 · Answer 1 · edited May 23 '17 at 12:21

JSTL tags and JSF tags are not synchronous. JSTL tags run in build time while JSF tags run in render time. That is why you see a strange behavior. You should use JSF rendered attribute instead of c:if

Furthermore, char comparison also works differently from Java. Chars behave like String in EL expressions which means != operator does not give proper results for String comparison.

<c:if test="${program.distTypeName != 'X' || program.distTypeName != 'Y' || program.distTypeName != 'Z'}">

Above c:if statement can be converted to rendered attribute like

<h:panelGroup rendered="#{program.distTypeName.compareTo('X') != 0 || program.distTypeName.compareTo('Y') != 0 || program.distTypeName.compareTo('Z') != 0}">

or ASCII representations of characters can also be used here if distTypeName is a char.

<h:panelGroup rendered="#{program.distTypeName ne 88 || program.distTypeName ne 89 || program.distTypeName ne 90}">

Related Post

https://stackoverflow.com/a/4154930/892994

This is likely not the cause. The code as OP postes so far is perfectly legit. This would only cause problems if the code posted so far is actually inside a JSF repeater component such as `` or ``, but nothing in the question indicates that. The bean name `#{program}` is already a big hint that it represents an entity not a backing bean. — BalusC, Jul 11 '13 at 16:11

how to display h:panelGroup based on a condition

1 Answers1