为什么< h:panelGroup>通过< f:subview>访问时未找到ID标签? [英] Why <h:panelGroup> id is not found when I access through <f:subview> tag?

问题描述

 <h:panelGroup id="userPanel"><f:subview rendered="#{searchView.isUser}">
    <h:commandButton value="test" action="#{searchAction.doFindUsers}"   >
        <f:ajax execute="@this" event="action" render="userPanel" />
    </h:commandButton> </f:subview></h:panelGroup>

我收到以下错误消息:无法在组件j_idt26的上下文中找到它

I am getting the error as: cannot locate it in the context of the component j_idt26

推荐答案

因为<f:subview>是

如何找出要进行Ajax更新/渲染的组件的客户端ID?找不到表达式为"foo"的组件；引用自"bar"

只需使用<h:panelGroup>

<h:panelGroup id="userPanel">
    <h:panelGroup rendered="#{searchView.isUser}">
        <h:commandButton value="test" action="#{searchAction.doFindUsers}">
            <f:ajax execute="@this" event="action" render="userPanel" />
        </h:commandButton>
    </h:panelGroup>
</h:panelGroup>

或<ui:fragment>(开销少一点)

<h:panelGroup id="userPanel">
    <ui:fragment rendered="#{searchView.isUser}">
        <h:commandButton value="test" action="#{searchAction.doFindUsers}">
            <f:ajax execute="@this" event="action" render="userPanel" />
        </h:commandButton>
    </ui:fragment>
</h:panelGroup>

或在此特定示例中，直接在命令按钮上(请确保您的情况比这更复杂)

or in this specific example just directly on command button (surely your case is more complex than that)

<h:panelGroup id="userPanel">
    <h:commandButton value="test" action="#{searchAction.doFindUsers}"  rendered="#{searchView.isUser}">
        <f:ajax execute="@this" event="action" render="userPanel" />
    </h:commandButton>
</h:panelGroup>

另请参见:

• 替代ui:JSF中的fragment
• 非JSF组件的条件渲染(普通的HTML和模板文本)

See also:

• Alternative to ui:fragment in JSF
• Conditional rendering of non-JSF components (plain vanilla HTML and template text)

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