Question

我在Glassfish 3.1上使用PrimeFaces 2.2.1 Tree组件

我正在尝试将树上的选定节点设置为我的支持bean中的TreeNode对象，但它始终为null。

我在PrimeFaces论坛上寻求支持，但遗憾的是没有得到回复。

<p:tree id="contextTree" value="#{contextTreeBean.contextRoot}" var="node" selectionMode="single" selection="#{contextTreeBean.selectedNode}">
        <p:treeNode>
            <h:outputText value="#{node.name}"/>
        </p:treeNode>
    </p:tree>
    <h:outputText id="output" value="#{contextTreeBean.output}"/>
    <p:commandButton id ="createButton" value="+" actionListener="#{contextTreeBean.createContext()}" update="contextTree, output"/>


@ManagedBean
@RequestScoped
public class contextTreeBean {

    @EJB
    private ContextFacadeLocal contextFacade;
    private Context context = new Context();
    private TreeNode contextRoot;
    private TreeNode selectedNode;
    private String output;

    /** Creates a new instance of contextTreeBean */
    public contextTreeBean() {
    }

    public void createContext() {
        output = selectedNode.getData().toString();
    }

    public String getOutput() {
        return output;
    }

    public void setOutput(String output) {
        this.output = output;
    }

    public TreeNode getSelectedNode() {
        return selectedNode;
    }

    public void setSelectedNode(TreeNode selectedNode) {
        this.selectedNode = selectedNode;
    }

    public Context getContext() {
        return context;
    }

    public void setContext(Context context) {
        this.context = context;
    }

    public ContextFacadeLocal getContextFacade() {
        return contextFacade;
    }

    public void setContextFacade(ContextFacadeLocal contextFacade) {
        this.contextFacade = contextFacade;
    }

    public TreeNode getContextRoot() {
        return contextRoot;
    }

    public void setContextRoot(TreeNode contextRoot) {
        this.contextRoot = contextRoot;
    }

    @PostConstruct
    private void postConstruct() {
        populateContextTree();
    }

    private void populateContextTree() {
        buildContextTree(new DefaultTreeNode("Root", null), contextFacade.findRootContexts());
    }

    private void buildContextTree(TreeNode parentNode, List<Context> children) {
        for (Context currentContextNode : children) {
            TreeNode tempNode = new DefaultTreeNode(currentContextNode, parentNode);
            buildContextTree(tempNode, currentContextNode.getChildren());
        }
        contextRoot = parentNode;
    }
}

Answer 1

您是否尝试通过记录验证selectedNode是否为空？可能已设置，但update的{{1}}属性未正确设置。请记住，默认情况下，<p:commandButton>会将其ID添加到子元素中。

同时验证<h:form>

中的其他元素是否没有引发验证错误

此外，我还不相信Primefaces树组件在由<h:form>托管bean支持时可以正常工作。尝试将托管bean更改为@RequestScoped，以便托管bean的生命周期跨越各个请求。

Answer 2

我在一个JSF模板客户端中有Tree组件，模板中有表单。将表单移动到客户端页面工作。我能够保持支持bean RequestScoped。

PrimeFaces树选择为空

2 个答案: