< p:ajax侦听器>之后的Primefaces更新组件. [英] Primefaces update component after <p:ajax listener>

问题描述

我有一个selectOneMenu，它可以更改后备bean中的值，并根据该值显示或不显示另一个组件.我想要的是在通过selectOneMenu更改后备bean中的值之后更新该特定组件.

I have a selectOneMenu that changes a value in the backing bean and based on that value, another component is being displayed or not. What I would like is to update that certain component after the value in the backing bean is changed by the selectOneMenu

<h:selectOneMenu value="#{backingBean.id.value}" >
            <f:selectItem itemLabel="Choose" itemValue="0"/>
            <f:selectItems value="#{backingBean.idList}"
                var="id" itemLabel="#{id.name}" itemValue="#{id.value}" />
             <p:ajax listener="#{backingBean.changeId}" process="@this" update="userMenu"/>
</h:selectOneMenu>
<p:menu id="userMenu" rendered="#{backingBean.id.value != 0}">
</p:menu>

该值会在后备bean中更改，但不会更新.

The value changes in the backing bean but the is not updated.

推荐答案

这应该有效

<h:selectOneMenu value="#{backingBean.id.value}" >
        <f:selectItem itemLabel="Choose" itemValue="0"/>
        <f:selectItems value="#{backingBean.idList}"
            var="id" itemLabel="#{id.name}" itemValue="#{id.value}" />
         <p:ajax listener="#{backingBean.changeId}" process="@this" update="userMenuWrapper"/>
</h:selectOneMenu>
<p:outputPanel id="userMenuWrapper">
    <p:menu id="userMenu" rendered="#{backingBean.id.value != 0}"/>
</p:outputPanel>

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