相关疑难解决方法(0)

是什么区别action和actionListener,什么时候应该使用action与actionListener？

我不能似乎能当我内触发事件column的dataTable.这是我简单的演示

<h:form id="form">
    <!--This section of p:tree here seems to be the reason causing the event not fired when click the command button-->
    <p:tree value="#{viewBean.root}" var="node" dynamic="true" cache="false"  
                selectionMode="checkbox"  selection="#{treeBean.selectedNode}">  

        <p:ajax event="expand" update=":form:messages" listener="#{viewBean.onNodeExpand}" />  
        <p:ajax event="collapse" update=":form:messages" listener="#{viewBean.onNodeCollapse}" />  
        <p:ajax event="select" update=":form:messages" listener="#{viewBean.onNodeSelect}" />  
        <p:ajax event="unselect" update=":form:messages" listener="#{viewBean.onNodeUnselect}" />  

        <p:treeNode>  
            <h:outputText value="#{node}" />  
        </p:treeNode>  
    </p:tree>
    <h:panelGroup id="mygroup">
            <p:dataTable id="mytable" value="#{viewBean.foodList}" var="item">
                <p:column>
                    #{item}
                </p:column>
                <p:column>
                    <p:commandButton value="delete" 
                                     action="#{viewBean.delete}"
                                     update=":form:mygroup">
                        <f:setPropertyActionListener target="#{viewBean.selectedFood}"
                                                     value="#{item}"/>
                    </p:commandButton>
                </p:column>
            </p:dataTable> …