获取Primefaces树中的节点索引

Question

我正在使用具有以下结构的Primefaces树：

节点1

节点1.1

节点1.2

节点1.3

现在，我想在Node 1.1和Node 1.2之间添加一个节点。我可以通过使用“add（int index，TreeNode element）”方法来实现。但为此我必须知道Node 1.1的索引。

有没有办法通过它的名字或任何其他方式获取Node的索引？

Answer 1

这是我的示例，它提供了一种在特定节点内添加现在节点的简单方法。

XHTML

<h:form>
    <p:tree value="#{treeBasicView.root}" 
            id="tree"
            var="node" 
            dynamic="true">
        <p:treeNode>
            <h:outputText value="#{node}" />
        </p:treeNode>
    </p:tree>

    <p:outputLabel value="add node : " />
    <p:inputText id="newNodeName" 
                 value="#{treeBasicView.newNodeName}"/>

    <p:outputLabel value="to into : " />
    <p:inputText id="selectedNodeName" 
                 value="#{treeBasicView.selectedNodeName}"/>
    <p:commandButton value="add child" 
                     process="@this,newNodeName,selectedNodeName"
                     update="tree"
                     actionListener="#{treeBasicView.addNewNode}"/>
</h:form>

ManagedBean

@ManagedBean(name = "treeBasicView")
@ViewScoped
public class BasicView implements Serializable {

    private TreeNode root;
    private String selectedNodeName;
    private String newNodeName;

    public TreeNode getRoot() {
        return root;
    }

    public String getSelectedNodeName() {
        return selectedNodeName;
    }

    public void setSelectedNodeName(String selectedNodeName) {
        this.selectedNodeName = selectedNodeName;
    }

    public String getNewNodeName() {
        return newNodeName;
    }

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

    @PostConstruct
    public void init() {
        root = new DefaultTreeNode("Root", null);
        TreeNode node0 = new DefaultTreeNode("Node 0", root);
        TreeNode node1 = new DefaultTreeNode("Node 1", 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);

        node1.getChildren().add(new DefaultTreeNode("Node 1.1"));
        node00.getChildren().add(new DefaultTreeNode("Node 0.0.0"));
        node00.getChildren().add(new DefaultTreeNode("Node 0.0.1"));
        node01.getChildren().add(new DefaultTreeNode("Node 0.1.0"));
        node10.getChildren().add(new DefaultTreeNode("Node 1.0.0"));
        root.getChildren().add(new DefaultTreeNode("Node 2"));
    }

    public void addNewNode(ActionEvent event) {
        findNode(root);
    }

    private void findNode(TreeNode node){
        List<TreeNode> subChild = node.getChildren();
        for (TreeNode treeNode : subChild) {
            if(treeNode.getData().equals(selectedNodeName)){
                treeNode.getChildren().add(new DefaultTreeNode(newNodeName));
                break;
            }
            findNode(treeNode);
        }
    }
}

点击添加孩子后

您可以使用treeNode.getChildren().add(i, name)等来应用此示例。

Answer 2

这是另一个示例，它提供了一种在特定节点下添加现在节点的简单方法。

XHTML

<h:form>
    <p:tree value="#{treeBasicView.root}" 
            id="tree"
            var="node" 
            dynamic="true">
        <p:treeNode>
            <h:outputText value="#{node}" />
        </p:treeNode>
    </p:tree>

    <p:outputLabel value="add node : " />
    <p:inputText id="newNodeName" 
                 value="#{treeBasicView.newNodeName}"/>

    <p:outputLabel value="below : " />
    <p:inputText id="selectedNodeName" 
                 value="#{treeBasicView.selectedNodeName}"/>
    <p:commandButton value="add child" 
                     process="@this,newNodeName,selectedNodeName"
                     update="tree"
                     actionListener="#{treeBasicView.addNewNode}"/>
</h:form>

ManagedBean

@ManagedBean(name="treeBasicView")
@ViewScoped
public class BasicView implements Serializable {

    private TreeNode root;
    private TreeNode selectedNode;
    private int position;
    private String selectedNodeName;
    private String newNodeName;

    public TreeNode getRoot() {
        return root;
    }

    public String getSelectedNodeName() {
        return selectedNodeName;
    }

    public void setSelectedNodeName(String selectedNodeName) {
        this.selectedNodeName = selectedNodeName;
    }

    public String getNewNodeName() {
        return newNodeName;
    }

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

    @PostConstruct
    public void init() {
        root = new DefaultTreeNode("Root", null);
        TreeNode node0 = new DefaultTreeNode("Node 0", root);
        TreeNode node1 = new DefaultTreeNode("Node 1", 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);

        node1.getChildren().add(new DefaultTreeNode("Node 1.1"));
        node00.getChildren().add(new DefaultTreeNode("Node 0.0.0"));
        node00.getChildren().add(new DefaultTreeNode("Node 0.0.1"));
        node01.getChildren().add(new DefaultTreeNode("Node 0.1.0"));
        node10.getChildren().add(new DefaultTreeNode("Node 1.0.0"));
        root.getChildren().add(new DefaultTreeNode("Node 2"));
    }

    public void addNewNode(ActionEvent event) {
        findNode(root);
        selectedNode.getParent().getChildren().add(position, new DefaultTreeNode(newNodeName));
    }

    private void findNode(TreeNode node){
        int pos = 0;
        List<TreeNode> subChild = node.getChildren();
        for (TreeNode treeNode : subChild) {
            pos = pos + 1;
            if(treeNode.getData().equals(selectedNodeName)){
                position = pos;
                selectedNode = treeNode;
            }
            findNode(treeNode);
        }
    }
}

点击添加孩子后