Primefaces 数据表不遵守渲染标签的条件限制

Question

我有这样的代码：

<p:outputPanel id="conditionalPanel">
    <p:panel rendered="#{object.category.string == 'foo'}">
        <ui:param name="foo" value="#{object}"/>
        <h:panelGrid columns="3" id="fooAssignmentsuttonGrid">
            <h:outputLabel for="barToAdd" styleClass="desc" value="#{foobarzooUIData.label}"/>
            <h:selectOneMenu id="barToAdd" value="#{fooController.barToAdd}">
                <f:selectItems value="#{barsToAddAssignments}"
                               var="foobarzoo" itemValue="#{foobarzoo}" 
                               itemLabel="#{foobarzooUIData.buildLabelForObject(foobarzoo)}"/>
            </h:selectOneMenu>
            <p:commandButton value="#{text['button.add']}" process="@this barToAdd" 
                             update="assignmentDetail" disabled="#{empty barsToAddAssignments}"
                    action="#{fooController.createNewAssignment(foo)}">
            </p:commandButton>
        </h:panelGrid>
        <p:outputPanel id="fooAssignmentsTable">
            <p:dataTable value="#{utils:toList(foo.fooAssignments)}" var="assignment">
                <!-- p:columns here etc..-->
            </p:dataTable>
        </p:outputPanel>

        <p:outputPanel id="assignmentDetail">
            <p:panel rendered="#{not empty fooController.selectedAssignment}" style="margin-top: 30px;">
                <h:panelGrid id="assignmentDetailForm" styleClass="formsTable" columns="2">
                   <!-- Some kick ass code here -->
                </h:panelGrid>
            </p:panel>
        </p:outputPanel>
    </p:panel>
</p:outputPanel>

问题是，当我点击这个页面的时候

 object.category.string == 'foo'

不满意，还在补：

/test.xhtml @264,147 value="#{utils:toList(foo.fooAssignments)}": The class 'com.foo.bar.too does not have the property 'fooAssignments'.

是的，我知道这个class没有这个属性，但是这个根本不应该评价，不是吗？

我在这里错过了什么？

Answer 1

很遗憾您没有 post 完整的堆栈跟踪，因为它通常代表了整个答案本身，我可以将其翻译成外行人的术语。

通常这确实会在 component tree visit whereby the rendered attribute is not obeyed. The mention of the stack trace and the actual versions being used should reveal whether it's a "feature" or actually a bug in either the JSF impl being used, or in PrimeFaces. Generally I'd say that this would be a bug. This problem has before been observed with Mojarra's <ui:repeat> and has been fixed in that side. See also this related Q&A: PropertyNotFoundException on conditionally rendered subclasses in ui:repeat 期间发生。

如果升级到最新的 JSF impl 和 PrimeFaces 版本没有帮助，那么最好的办法是有条件地构建视图而不是有条件地呈现视图。 JSTL 在这方面很有帮助。另见 JSTL in JSF2 Facelets... makes sense?

<c:if test="#{object.category.string == 'foo'}">
    <p:panel>
        ...
    </p:panel>
</c:if>

Primefaces 数据表不遵守渲染标签的条件限制

Primefaces datatable not obeying conditional restiriction of rendered tag

jsf

primefaces