获取素数树中节点的索引 [英] Get the Index of the Node in a Primefaces Tree
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问题描述
我正在使用具有以下结构的 Primefaces 树:
I am using a Primefaces Tree which has a following structure :
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)"方法来做到这一点.但为此我必须知道 Node 1.1 的索引.
Now, I want to add a node in between Node 1.1 and Node 1.2. I can do that by using "add(int index, TreeNode element)" method. But for that I must know the index of Node 1.1.
有没有办法通过节点名称或其他方式获取节点的索引?
Is there any way to get the index of a Node by it's name or by any other means?
推荐答案
这是另一个示例,它提供了一种在特定节点下添加 now 节点的简单方法.
This is another example which present a easy way to add now node below specific node.
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>
托管Bean
@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);
}
}
}
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