I am trying to conditionally build a custom list using <ui:repeat>
. On every occurrence of -1 as item-value in list, I need to add a line break.
I tried to use <c:if>
inside <ui:repeat>
for that, but it does not seem to work. It always evaluates false
.
<ul>
<ui:repeat value="#{topics.list}" var="topicId" >
<li>#{topicId}</li>
<c:if test="#{topicId eq -1}"> <br/> </c:if>
</ui:repeat>
</ul>
Is this possible?
Not with JSTL tags, no. They runs during view build time, not during view render time. You can visualize it as follows, when JSF builds the view, JSTL tags runs from to bottom first and the result is a pure JSF component tree. Then when JSF renders the view, JSF components runs from top to bottom and the result is a bunch of HTML. So, JSTL and JSF doesn't run in sync as you'd expect from the coding. At the moment your
<c:if>
runs, the#{topicId}
isn't available in the scope.Instead of using
<c:if>
, you need to specify the condition in therendered
attribute of the JSF component of interest. As you've actually none, you could wrap it in a<ui:fragment>
.Alternatives are
<h:panelGroup>
or in your specific case
<h:outputText escape="false">
as both also emits nothing else to the HTML output when no client side attributes are specified.
See also:
Unrelated to the concrete problem, that's the wrong place for a
<br/>
. It would be ignored by any webbrowser respecting the HTML specification. Don't you mean it to be inside the<li>
? Or better, give it aclass
and let CSS give it amargin-bottom
.