Alternative c:if in JSF - jsf

Question

Does someone know a alternative to <c:if> for view render time, or even if that is possible. For what I have search until now it doesn't exist, or the alternative would be using the rendered attribute, but for me doesn't really work.
<af:listView value="#{bindings.date.collectionModel}" var="item" id="lv1">
<af:listItem id="li2">
<af:iterator id="i1" value="#{bindings.list.collectionModel}" var="row">
<c:if test="#{item.bindings.attrid.inputValue eq row.attrid}">
<ui:param name="varUI" value="true" />
<c:set var="varC" value="true" />
</c:if>
</af:iterator>
<af:outputText value="#{varUI}" id="otqaswq"/>
<!--<af:outputText value="#{varC}" id="otqawq"/>-->
<af:selectBooleanCheckbox text="Activated" id="sbc2" value="#{varUI}"/>
</af:listItem>
</af:listView>
So in the code above I know that c: they run in different time, view build time and not on the render time.
What I needed was that the af:selectBooleanCheckbox would appear true or false depending if there are values with the same value.
My question is, someone know a alternative way of doing this?

Answer 1

rendered should 100% work, your expression may be incorrect.
Switching to another alternative where you will use exactly the same expression will lead you in the very same place.

Answer 2

You cannot use an <af:iterator> to conditionally set a value using <ui:param> or <c:set>, because they are both tag handlers which are evaluated before <af:iterator>. You might use <c:forEach> instead, but that requires some collection to iterate over. A javax.faces.model.DataModel like #{bindings.list.collectionModel} will most likely not work.
But to be honest, you should implement some Java method which will give you the desired value (true or false) instead of trying to implement this logic in terms of JSF tags.