Question

当我在column dataTable范围内时，似乎无法触发事件。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>
    </h:panelGroup>
</h:form>

这是我的托管bean

@ManagedBean
@ViewScoped
public class ViewBean {

    private TreeNode root;  

    private TreeNode selectedNode;  
    private List<String> foodList;

    private String selectedFood;

    @PostConstruct
    public void init(){

        foodList = new ArrayList<String>();
        foodList.add("Pizza");
        foodList.add("Pasta");
        foodList.add("Hamburger");

        root = new DefaultTreeNode("Root", null);  
        TreeNode node0 = new DefaultTreeNode("Node 0", root);  
        TreeNode node1 = new DefaultTreeNode("Node 1", root);  
        TreeNode node2 = new DefaultTreeNode("Node 2", root);  

        TreeNode node00 = new DefaultTreeNode("Node 0.0", node0);  
        TreeNode node01 = new DefaultTreeNode("Node 0.1", node0);  

        TreeNode node10 = new DefaultTreeNode("Node 1.0", node1);  
        TreeNode node11 = new DefaultTreeNode("Node 1.1", node1);  

        TreeNode node000 = new DefaultTreeNode("Node 0.0.0", node00);  
        TreeNode node001 = new DefaultTreeNode("Node 0.0.1", node00);  
        TreeNode node010 = new DefaultTreeNode("Node 0.1.0", node01);  

        TreeNode node100 = new DefaultTreeNode("Node 1.0.0", node10);  
    }

    public void delete(){

        foodList.remove(selectedFood);

    }
    //setter and getter

    public void onNodeExpand(NodeExpandEvent event) {  
       FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Expanded", event.getTreeNode().toString());  

       FacesContext.getCurrentInstance().addMessage(null, message);  
    }  

    public void onNodeCollapse(NodeCollapseEvent event) {  
       FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Collapsed", event.getTreeNode().toString());  

       FacesContext.getCurrentInstance().addMessage(null, message);  
    }  

    public void onNodeSelect(NodeSelectEvent event) {  
       FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Selected", event.getTreeNode().toString());  

       FacesContext.getCurrentInstance().addMessage(null, message);  
    }  

    public void onNodeUnselect(NodeUnselectEvent event) {  
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Unselected", event.getTreeNode().toString());  

        FacesContext.getCurrentInstance().addMessage(null, message);  
    }  
}

我的问题似乎是事件没有被触发，这意味着delete永远不会被调用。

我环顾四周，并且知道Mojarra有很多嵌套UIData组件的问题，所以我尝试了Mojarra 2.1.4，仍然没有解决问题。我试过Myfaces 2.1.5，仍然无法正常工作！这是Primefaces的错误吗？我甚至使用h:panelGroup作为update的包装器，但它仍然不起作用。

编辑：结果是p:tree上方的dataTable是点击commandButton时未触发事件的根本原因。如果我删除了p:tree，那么它会立即生效。请注意，p:tree本身工作得很好，因为我点击了checkout，在我的托管bean上触发了事件。

Answer 1

这是您自己代码中的错误。

<partial-response>
  <error>
    <error-name>class javax.el.ELException</error-name>
    <error-message><![CDATA[/index.xhtml @15,84 selection="#{viewBean.selectedNode}": Cannot convert [Lorg.primefaces.model.TreeNode;@fd9b4d of type class [Lorg.primefaces.model.TreeNode; to interface org.primefaces.model.TreeNode]]></error-message>
  </error>
</partial-response>

具体的异常消息表明，<p:tree selection>应该引用TreeNode[]类型的属性，而不是TreeNode（请注意类标识符中的[前缀。消息，表示数组类型）。所以，相应地修复它：

<p:tree selection="#{treeBean.selectedNodes}">

与

private TreeNode[] selectedNodes;

无论如何，你在同一个“神”形式中同时拥有<p:tree>和<p:dataTable>。因此，其中任何一个中的任何操作都将提交其他组件上的所有内容。如果树和表彼此没有任何关系，那么它们应该各自放在它自己的<h:form>中。或者，您必须在命令链接/按钮中添加process属性，以仅处理感兴趣的包含组件，例如，表格内的按钮process="mytable"。

这是Primefaces错误还是Mojarra / MyFaces错误

1 个答案: