Question

我想在primeface树中添加和删除节点。

树是动态填充的，即当你展开它时会创建子节点。

现在我想通过弹出窗口添加和删除节点，（当我们右键单击节点时，它会提供添加或删除选项）。如果我们选择add，则会打开一个弹出窗口，我们可以选择填充节点的详细信息。如果我们单击保存节点，它将添加到所选节点下的树中。

但是，在下面的代码中以及在弹出对话框中填充数据之后，未添加节点并且树扩展不起作用。

有任何建议如何解决这个问题？

    package com.test.primefaces;
    import java.io.Serializable;
    import javax.annotation.PostConstruct;
    import javax.faces.bean.SessionScoped;
    import javax.faces.event.ActionEvent;
    import javax.faces.bean.ManagedBean;
    import javax.inject.Named;
    import org.primefaces.event.NodeExpandEvent;
    import org.primefaces.model.DefaultTreeNode;
    import org.primefaces.model.TreeNode;

    @ManagedBean
    @SessionScoped
    public class TreeController implements Serializable {

        /**
         * 
         */
        private static final long serialVersionUID = 1L;
        private TreeNode root;
        private String newNodeName;
        private TreeNode selectedNode;

        @PostConstruct
        public void buildTree() {
            root = new DefaultTreeNode("Root", null);  
            createNode("Node 0", root);
            createNode("Node 1", root);
            createNode("Node 2", root);                        
        }

        public TreeNode getRoot() {
            return root;
        }

        public void setRoot(TreeNode root) {
            this.root = root;
        }

       /* public void addChildNode(ActionEvent actionEvent) {
            System.out.println("Selected Node: "+getSelectedNode().toString());
            TreeNode newNode = new DefaultTreeNode("Node New", getSelectedNode());
            getSelectedNode().setExpanded(true);
            }*/

        public void addChildNode() {
            TreeNode newNode = new DefaultTreeNode(newNodeName, getSelectedNode());
            System.out.println("Selected Node: "+getSelectedNode().toString());
            /*TreeNode newNode = new DefaultTreeNode("Node New", getSelectedNode());
            getSelectedNode().setExpanded(true);*/
            }

        public void deleteNode() {
            TreeNode newNode = new DefaultTreeNode(newNodeName, getSelectedNode());
            /*System.out.println("Selected Node: "+getSelectedNode().toString());
            TreeNode newNode = new DefaultTreeNode("Node New", getSelectedNode());
            getSelectedNode().setExpanded(true);*/
            }

        public void onNodeExpand(NodeExpandEvent event) {  
             DefaultTreeNode parent = (DefaultTreeNode) event.getTreeNode();
             if (parent.getChildCount() == 1 && parent.getChildren().get(0).getData().toString().equals("DUMMY")) {
                 parent.getChildren().remove(0);
                 createNode("Node A", parent);
                 createNode("Node B", parent);
                 createNode("Node C", parent);
             }
        }

        private void createNode(String tag, TreeNode parent) {
            TreeNode node = new DefaultTreeNode(tag, parent); 
            // Create Dummy node, just to make the parent node expandable
            new DefaultTreeNode("DUMMY", node);
        }

        public String getNewNodeName() {
            return newNodeName;
        }

        public void setNewNodeName(String newNodeName) {
            this.newNodeName = newNodeName;
        }

        public static long getSerialversionuid() {
            return serialVersionUID;
        }

        public TreeNode getSelectedNode() {
            return selectedNode;
        }

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

和xhtml

    <html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:ui="http://java.sun.com/jsf/facelets"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:p="http://primefaces.org/ui">
    <h:head>
        <script name="jquery/jquery.js" library="primefaces"></script>
    </h:head>
    <h:form id="form">
        <p:tree id="tree" value="#{treeController.root}" var="node"
            dynamic="true" cache="false" selectionMode="single"
            selection="#{treeController.selectedNode}">
            <p:ajax event="expand" listener="#{treeController.onNodeExpand}" />
            <p:treeNode>
                <h:outputText value="#{node}" />
            </p:treeNode>
        </p:tree>

        <p:contextMenu for="tree">
            <p:menuitem value="Add Node" update="treeAdd" icon="ui-icon-search"
                oncomplete="PF('treeAddDialog').show()" />
            <p:menuitem value="Delete" update="tree" icon="ui-icon-close"
                actionListener="#{treeController.deleteNode}" />
        </p:contextMenu>

        <p:dialog header="tree node" widgetVar="treeAddDialog" modal="true"
            showEffect="fade" hideEffect="fade" resizable="false">
            <p:outputPanel id="treeAdd" style="text-align:center;">
                <p:panelGrid columns="2" columnClasses="label,value">
                    <f:facet name="header">
                        <p:graphicImage
                            name="demo/images/car/#{dtContextMenuView.selectedCar.brand}-big.gif" />
                    </f:facet>

                    <h:outputLabel for="nodeName" value="NodeName" />
                    <p:inputText id="nodeName" value="#{treeController.newNodeName}"
                        required="true" label="nodename" />

                    <f:facet name="footer">
                        <p:commandButton actionListener="#{treeController.addChildNode}"
                            value="Save" oncomplete="treeAddDialog.hide();" />
                        <p:commandButton value="Cancel" onclick="treeAddDialog.hide();" />
                    </f:facet>


                </p:panelGrid>
            </p:outputPanel>

        </p:dialog>
    </h:form>
    </html>

Primefaces添加和删除节点到树

0 个答案: