Question

我有两份清单,其中不包括同一个物体。

我想检查第一个清单是否含有第二个清单的标的。

<ui:repeat var="item" value="#{userTypeController.permissionItems}">
    <c:if test="#{userTypeController.permissionItemsUserType.contains(item)}">
        <h:selectBooleanCheckbox value="#{true}"/> 
        <h:outputText value="#{item.getAction()}" />
    </c:if>
    <c:if test="#{!userTypeController.permissionItemsUserType.contains(item)}">
        <h:selectBooleanCheckbox value="#{false}"/> 
        <h:outputText value="#{item.getAction()}" />
    </c:if>
</ui:repeat>

但这似乎行不通,而且所有我都错了。

I ve 改变了等同法和散列法,但无助。

Answer 1

JSTL tags such as <c:if> trans during view Building time and the result is JSF content only. 共同基金各组成部分在进行观察时,只有超文本。他们不 run。初等到下级的劳动和社会保障部各部门从上至下。

In your case, when JSTL tags runs, there s no means of #{item} anywhere, because it s been definied by a JSF component, so it ll for JSTL always be evaluated as if it is null. You need to use JSF components instead. In your particular case a <h:panelGroup rendered> should do it:

<ui:repeat var="item" value="#{userTypeController.permissionItems}">
    <h:panelGroup rendered="#{userTypeController.permissionItemsUserType.contains(item)}">
        <h:selectBooleanCheckbox value="#{true}"/> 
        <h:outputText value="#{item.getAction()}" />
    </h:panelGroup>
    <h:panelGroup rendered="#{!userTypeController.permissionItemsUserType.contains(item)}">
        <h:selectBooleanCheckbox value="#{false}"/> 
        <h:outputText value="#{item.getAction()}" />
    </h:panelGroup>
</ui:repeat>

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