Primefaces 树(Tree)、树节点(TreeNode)、树表(TreeTable) 示例教程

2 年 ago
文, 翔
31 minutes

为了显示层次数据和创建网站导航，Primefaces为你提供了树和树表组件。利用这些组件并不容易，它需要大量的技术细节。其中一些技术问题在互联网上发布的技术文档中随机涵盖，而其他部分则没有。本教程旨在为您提供如何从这些组件中受益的完整解释。

Primefaces树形组件的基本信息

Info Tree
Component Class org.primefaces.component.tree.Tree
Component Type org.primefaces.component.Tree
Component Family org.primefaces.component
Renderer Type org.primefaces.component.TreeRenderer
Renderer Class org.primefaces.component.tree.TreeRenderer

Primefaces 树的属性

Name Default Type Description
id null String Unique identifier of the component
rendered true Boolean Boolean value to specify the rendering of the component, when set to false component will not be rendered
binding null Object An el expression that maps to a server side UIComponent instance in a backing bean
widgetVar null String Name of the client side widget
value null Object A TreeNode instance as the backing model
var null String Name of the request-scoped variable that’ll be usedto refer each treenode data.
dynamic false Boolean Specifies the ajax/client toggleMode
cache true Boolean Specifies caching on dynamically loaded nodes.When set to true expanded nodes will be kept in memory.
onNodeClick null String Javascript event to process when a tree node isclicked.
selection null Object TreeNode array to reference the selections.
style null String Style of the main container element of tree
styleClass null String Style class of the main container element of tree
selectionMode null String Defines the selectionMode
highlight true Boolean Highlights nodes on hover when selection is enabled.
datakey null Object Unique key of the data presented by nodes.
animate false Boolean When enabled, displays slide effect on toggle.
orientation vertical String Orientation of layout, vertical or horizontal.
propagateSelectionUp true Boolean Defines upwards selection propagation forcheckbox mode.
propagateSelectionDown true Boolean Defines downwards selection propagation forcheckbox mode.
dir ltr String Defines text direction, valid values are ltr and rtl.
draggable false Boolean Makes tree nodes draggable.
droppable false Boolean Makes tree droppable.
dragdropScope null String Scope key to group a set of tree components fortransferring nodes using drag and drop.
dragMode self String Defines parent-child relationship when a node isdragged, valid values are self (default), parent andancestor.
dropRestrict none String Defines parent-child restrictions when a node isdropped valid values are none (default) and sibling.
required false Boolean Validation constraint for selection.
requiredMessage null String Message for required selection validation.

开始使用Primefaces Tree

该树是由一个org.primefaces.model.TreeNode实例填充的，该实例对应于根节点。以下是一个简单的示例，您可以在其中使用Tree组件。index.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node">
		<p:treeNode>
			<h:outputText value="#{node}"/>
		</p:treeNode>
	</p:tree>
</h:form>
</html>

package com.Olivia.prime.faces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

@ManagedBean
@SessionScoped
public class TreeManagedBean {
	// TreeNode instance
	private TreeNode root;

	public TreeManagedBean(){
		// This is the root node, so it's data is root and its parent is null
		this.root = new DefaultTreeNode("Root Node", null);
		// Create child node
		TreeNode child = new DefaultTreeNode("Child Node", this.root);
		// Reference the parent of child node
		child.setParent(this.root);
		// Create descendent nodes
		TreeNode descendent = new DefaultTreeNode("Descendent Node", child);
		// Reference the parent of descendent node
		descendent.setParent(child);
	}

	public TreeNode getRoot() {
		return root;
	}

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

以下是对上述评论的进一步解释：

  • Tree component has associated with a TreeNode instance called root.
  • Root instance has also a child as a TreeNode instance which also refers its child.
  • This hierarchical view is displayed by referencing the root node directly using value attribute.
  • Attributue var has used by the Tree component for referencing the Request-Scoped variable that’ll be used to refer each treenode data.
  • Each TreeNode has been created by passing two arguments; encapsulated data object instance and parent reference.
  • Properties of every TreeNode are: type, data, children, parent and expanded boolean indicator. All of those properties has to be explored in the next coming sections.

Primefaces 动态树

树形组件默认情况下不是动态的，动态模式使用ajax从服务器端按需获取树节点。当节点展开时，树加载特定展开节点的子节点并发送给客户端进行显示。与原先发生的情况不同，在将切换设置为客户端时，模型中的所有树节点都会呈现给客户端并创建树。对于大规模数据，动态模式比使用默认行为更合适。以下是识别动态属性的方法。index.xhtml 代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true">
		<p:treeNode>
			<h:outputText value="#{node}"/>
		</p:treeNode>
	</p:tree>
</h:form>
</html>

Primefaces支持多种树节点类型。

一个常见的要求是在层级结构中希望拥有不同的TreeNode类型和图标。为了实现这一点，您应该按照以下简单的步骤进行操作：

  • Define/Place more than one components, each having a different type.
  • Use that defined type to bind TreeNodes in your model.

以下是一个简单示例，演示了使用不同的TreeNode来展示类型多样性。受影响的文件是index.xhtml视图文件和TreeManagedBean.java文件。index.xhtml的代码如下：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
	</p:tree>
</h:form>
</html>

package com.Olivia.prime.faces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

@ManagedBean
@SessionScoped
public class TreeManagedBean {
	// TreeNode instance
	private TreeNode root;

	public TreeManagedBean(){
		// This is the root node, so it's data is root and its parent is null
		this.root = new DefaultTreeNode("Root Node", null);
		// Create documents node
		TreeNode documents = new DefaultTreeNode("Documents", this.root);
		// Create document node
		TreeNode document01 = new DefaultTreeNode("document","Expenses.doc", documents);
		// Create images node
		TreeNode images = new DefaultTreeNode("Images", this.root);
		// Create image node
		TreeNode image01 = new DefaultTreeNode("image","Travel.gif", images);
		// Create videos node
		TreeNode videos = new DefaultTreeNode("Videos", this.root);
		// Create video node
		TreeNode video01 = new DefaultTreeNode("video","Play.avi", videos);
	}

	public TreeNode getRoot() {
		return root;
	}

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

从提供的演示中可以明显看出，TreeNode实例和p:treeNode组件之间的集成是通过type属性实现的。

Primefaces 树状图的 Ajax 行为事件

(Primefaces 树状图的 Ajax 行为事件)

树形控件提供了多种不同的 Ajax 行为事件：

Event Listener Parameter Fired
expand org.primefaces.event.NodeExpandEvent When a node is expanded.
collapse org.primefaces.event.NodeCollapseEvent When a node is collapsed.
select org.primefaces.event.NodeSelectEvent When a node is selected.
unselect org.primefaces.event.NodeUnselectEvent When a node is unselected.

以下树有三个侦听器：index2.xhtml代码。

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>
	</p:tree>
</h:form>
</html>

package com.Olivia.prime.faces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.primefaces.event.NodeCollapseEvent;
import org.primefaces.event.NodeExpandEvent;
import org.primefaces.event.NodeSelectEvent;
import org.primefaces.event.NodeUnselectEvent;
import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

@ManagedBean
@SessionScoped
public class TreeManagedBean {
	// TreeNode instance
	private TreeNode root;

	public TreeManagedBean(){
		// This is the root node, so it's data is root and its parent is null
		this.root = new DefaultTreeNode("Root Node", null);
		// Create documents node
		TreeNode documents = new DefaultTreeNode("Documents", this.root);
		// Create document node
		TreeNode document01 = new DefaultTreeNode("document","Expenses.doc", documents);
		// Create images node
		TreeNode images = new DefaultTreeNode("Images", this.root);
		// Create image node
		TreeNode image01 = new DefaultTreeNode("image","Travel.gif", images);
		// Create videos node
		TreeNode videos = new DefaultTreeNode("Videos", this.root);
		// Create video node
		TreeNode video01 = new DefaultTreeNode("video","Play.avi", videos);
	}

	public TreeNode getRoot() {
		return root;
	}

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

	public void onNodeSelect(NodeSelectEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Selected");
	}

	public void onNodeUnSelect(NodeUnselectEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: UnSelected");
	}

	public void onNodeExpand(NodeExpandEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Expanded");
	}

	public void onNodeCollapse(NodeCollapseEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Collapsed");
	}
}

以下是对原文的中文本地化改写：

只需要提供一个选项：

  • Once you’ve expanded TreeNode, an Ajax event has fired.
  • For each fired event, an ajax listener method has defined for handling purposes.
  • Event listeners are also useful when dealing with a huge amount of data. That is by providing the root and child nodes to the tree, use event listeners to get the selected node and add new nodes to that particular tree at runtime.
  • Select and UnSelect events haven’t produced now, issuing these events required SelectionMode to be set.

Primefaces树选择和选择模式

树组件提供了内置功能，帮助您识别已选择的节点。节点选择机制支持三种模式，为每种提供的模式分配了一个或多个树节点实例作为选择引用。

  • Single Mode: One TreeNode can be selected at a time. Selection should be a TreeNode reference.
  • Multiple Mode: Multiple nodes can be selected. Selection should be a TreeNode array reference.
  • Checkbox Mode: Multiple nodes can be selected using a checkbox UI. Selection should be a TreeNode array reference.

index1.xhtml 代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true"
			selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>
	</p:tree>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true"
			selectionMode="multiple" selection="#{treeManagedBean.multipleSelectedTreeNodes}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>
	</p:tree>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true"
			selectionMode="checkbox" selection="#{treeManagedBean.checkboxSelectedTreeNodes}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>
	</p:tree>
	<h:commandButton value="Print Selected Nodes" action="#{treeManagedBean.printSelectedNodes}"></h:commandButton>
</h:form>
</html>

package com.Olivia.prime.faces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.primefaces.event.NodeCollapseEvent;
import org.primefaces.event.NodeExpandEvent;
import org.primefaces.event.NodeSelectEvent;
import org.primefaces.event.NodeUnselectEvent;
import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

@ManagedBean
@SessionScoped
public class TreeManagedBean {
	// TreeNode instance
	private TreeNode root;
	private TreeNode singleSelectedTreeNode;
	private TreeNode [] multipleSelectedTreeNodes;
	private TreeNode [] checkboxSelectedTreeNodes;

	public TreeManagedBean(){
		// This is the root node, so it's data is root and its parent is null
		this.root = new DefaultTreeNode("Root Node", null);
		// Create documents node
		TreeNode documents = new DefaultTreeNode("Documents", this.root);
		// Create document node
		TreeNode document01 = new DefaultTreeNode("document","Expenses.doc", documents);
		// Create images node
		TreeNode images = new DefaultTreeNode("Images", this.root);
		// Create image node
		TreeNode image01 = new DefaultTreeNode("image","Travel.gif", images);
		// Create videos node
		TreeNode videos = new DefaultTreeNode("Videos", this.root);
		// Create video node
		TreeNode video01 = new DefaultTreeNode("video","Play.avi", videos);
	}

	public TreeNode getRoot() {
		return root;
	}

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

	public TreeNode getSingleSelectedTreeNode() {
		return singleSelectedTreeNode;
	}

	public void setSingleSelectedTreeNode(TreeNode singleSelectedTreeNode) {
		this.singleSelectedTreeNode = singleSelectedTreeNode;
	}

	public TreeNode[] getMultipleSelectedTreeNodes() {
		return multipleSelectedTreeNodes;
	}

	public void setMultipleSelectedTreeNodes(TreeNode[] multipleSelectedTreeNodes) {
		this.multipleSelectedTreeNodes = multipleSelectedTreeNodes;
	}

	public TreeNode[] getCheckboxSelectedTreeNodes() {
		return checkboxSelectedTreeNodes;
	}

	public void setCheckboxSelectedTreeNodes(TreeNode[] checkboxSelectedTreeNodes) {
		this.checkboxSelectedTreeNodes = checkboxSelectedTreeNodes;
	}

	public void onNodeSelect(NodeSelectEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Selected");
	}

	public void onNodeUnSelect(NodeUnselectEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: UnSelected");
	}

	public void onNodeExpand(NodeExpandEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Expanded");
	}

	public void onNodeCollapse(NodeCollapseEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Collapsed");
	}

	public String printSelectedNodes(){
		System.out.println("Single Selection Is :: "+this.singleSelectedTreeNode.getData());
		for(TreeNode n : this.multipleSelectedTreeNodes){
			System.out.println("Multiple Selection Are :: "+n.getData());
		}
		for(TreeNode n : this.checkboxSelectedTreeNodes){
			System.out.println("CheckBox Selection Are :: "+n.getData());
		}
		return "";
	}
}

完整详细说明还应该提到的一个要点是：

  • TreeNode component has attributes like expandedIcon and collapsedIcon for specifying icons of both expand and collapsed behaviors.
  • TreeNode component has also icon attribute that used for specifying the icon of the node itself.

Primefaces 节点缓存和节点点击事件

默认情况下，缓存属性已启用，动态加载的节点将在内存中保留，因此重新展开节点不会触发服务器端请求。如果您将其设置为false，则折叠节点将删除子节点，稍后展开节点将再次从服务器获取子节点。当某个节点被点击时，您还可以执行自定义的JavaScript代码。基于此目的使用onNodeClick属性，会调用JavaScript方法，并传递点击的HTML节点和事件元素。下面的示例是一些日志消息，当调用onNodeClick时显示。index3.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
	<script>
		function onNodeClick(node,event){
			console.log("nodeArg :: "+node);
			console.log("eventArg ::"+event);
		}
	</script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true" 
				onNodeClick="onNodeClick(node,event)"
				selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>					
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>									
	</p:tree>
</h:form>
</html>

Primefaces 拖放功能

单个树木中的树节点可以重新排序，甚至可以使用拖放功能在多个树木之间转移。以下示例向您展示如何使单个树具有可拖放功能。index4.xhtml 代码如下：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true" droppable="true" draggable="true"
				selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>					
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>									
	</p:tree>
</h:form>
</html>

应用拖放概念对单个树进行操作非常简单，而当涉及到多个树组件的拖放时，会出现更复杂的示例。以下示例为您展示了一个简单的示例。这次需要使用一个新属性dragdropScope来使树的节点能够在彼此之间进行拖放。index5.xhtml代码如下：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true" droppable="true" draggable="true"
				selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}"
				dragdropScope="myScope">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>					
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>									
	</p:tree>
	
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true" droppable="true" draggable="true"
				selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}"
				dragdropScope="myScope">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>					
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>									
	</p:tree>	
</h:form>
</html>

请用中文改写以下句子，只需要一种可能的选项：

“China is known for its rich cultural heritage and ancient traditions.”

Primefaces 水平树状结构

树的默认方向是垂直的，将其设置为水平方向可以以水平布局显示节点。除了拖放功能外，垂直树的所有特性在水平树上也是可用的。属性orientation用于此目的。 index6.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:tree value="#{treeManagedBean.root}" var="node" dynamic="true" orientation="horizontal" 
				selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>					
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>									
	</p:tree>
</h:form>
</html>

Primefaces ContextMenu：Primefaces 上下文菜单

Primefaces提供了一个特殊的组件，可以帮助您实现一些上下文操作。ContextMenu组件被用于此目的，Tree组件甚至与上下文菜单集成，以便对所选节点和开发多个选择的节点应用这些排序操作。应该使用ContextMenu的for属性来引用Tree组件的id属性，以便在每次选择Tree组件内的特定节点时显示定义的菜单。右键单击以显示上下文菜单组件。index6.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:contextMenu for="tree">
		<p:menuitem value="View" actionListener="#{treeManagedBean.view}" icon="ui-icon-search"></p:menuitem>
	</p:contextMenu>
	<p:tree id="tree" value="#{treeManagedBean.root}" var="node" dynamic="true" orientation="horizontal" 
				selectionMode="single" selection="#{treeManagedBean.singleSelectedTreeNode}">
		<p:treeNode expandedIcon="ui-icon ui-icon-folder-open"
						collapsedIcon="ui-icon ui-icon-folder-collapsed">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="document" icon="ui-icon ui-icon-document">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:treeNode type="image" icon="ui-icon ui-icon-image">
			<h:outputText value="#{node}"/>
		</p:treeNode>					
		<p:treeNode type="video" icon="ui-icon ui-icon-video">
			<h:outputText value="#{node}"/>
		</p:treeNode>
		<p:ajax event="select" listener="#{treeManagedBean.onNodeSelect}"></p:ajax>
		<p:ajax event="unselect" listener="#{treeManagedBean.onNodeUnSelect}"></p:ajax>
		<p:ajax event="expand" listener="#{treeManagedBean.onNodeExpand}"></p:ajax>
		<p:ajax event="collapse" listener="#{treeManagedBean.onNodeCollapse}"></p:ajax>									
	</p:tree>
</h:form>
</html>

package com.Olivia.prime.faces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.event.ActionEvent;

import org.primefaces.event.NodeCollapseEvent;
import org.primefaces.event.NodeExpandEvent;
import org.primefaces.event.NodeSelectEvent;
import org.primefaces.event.NodeUnselectEvent;
import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

@ManagedBean
@SessionScoped
public class TreeManagedBean {
	// TreeNode instance
	private TreeNode root;
	private TreeNode singleSelectedTreeNode;
	private TreeNode [] multipleSelectedTreeNodes;
	private TreeNode [] checkboxSelectedTreeNodes;
	
	public TreeManagedBean(){
		// This is the root node, so it's data is root and its parent is null
		this.root = new DefaultTreeNode("Root Node", null);
		// Create documents node
		TreeNode documents = new DefaultTreeNode("Documents", this.root);
		// Create document node
		TreeNode document01 = new DefaultTreeNode("document","Expenses.doc", documents);
		// Create images node
		TreeNode images = new DefaultTreeNode("Images", this.root);
		// Create image node
		TreeNode image01 = new DefaultTreeNode("image","Travel.gif", images);
		// Create videos node
		TreeNode videos = new DefaultTreeNode("Videos", this.root);
		// Create video node
		TreeNode video01 = new DefaultTreeNode("video","Play.avi", videos);
	}

	public TreeNode getRoot() {
		return root;
	}

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

	public void setSingleSelectedTreeNode(TreeNode singleSelectedTreeNode) {
		this.singleSelectedTreeNode = singleSelectedTreeNode;
	}

	public TreeNode[] getMultipleSelectedTreeNodes() {
		return multipleSelectedTreeNodes;
	}

	public void setMultipleSelectedTreeNodes(TreeNode[] multipleSelectedTreeNodes) {
		this.multipleSelectedTreeNodes = multipleSelectedTreeNodes;
	}

	public TreeNode[] getCheckboxSelectedTreeNodes() {
		return checkboxSelectedTreeNodes;
	}

	public void setCheckboxSelectedTreeNodes(TreeNode[] checkboxSelectedTreeNodes) {
		this.checkboxSelectedTreeNodes = checkboxSelectedTreeNodes;
	}

	public void onNodeSelect(NodeSelectEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Selected");
	}
	
	public void onNodeUnSelect(NodeUnselectEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: UnSelected");
	}
	
	public void onNodeExpand(NodeExpandEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Expanded");
	}
	
	public void onNodeCollapse(NodeCollapseEvent event){
		System.out.println("Node Data ::"+event.getTreeNode().getData()+" :: Collapsed");
	}
	
	public String printSelectedNodes(){
		System.out.println("Single Selection Is :: "+this.singleSelectedTreeNode.getData());
		for(TreeNode n : this.multipleSelectedTreeNodes){
			System.out.println("Multiple Selection Are :: "+n.getData());	
		}
		for(TreeNode n : this.checkboxSelectedTreeNodes){
			System.out.println("CheckBox Selection Are :: "+n.getData());	
		}		
		return "";
	}
	
	public void view(ActionEvent e){
		System.out.println("View action has invoked against node :: "+this.singleSelectedTreeNode.getData());
	}	
}

请用中文原生语言表达以下内容，只需要一个版本:
1. Can you help me with this problem?
2. I really appreciate your help.
3. How do you say “hello” in Chinese?
4. What is the weather like today?
5. I am going to the supermarket to buy some groceries.

Primefaces树形表格

TreeTable用于以表格形式显示分层数据。

开始使用Primefaces TreeTable

在探索TreeTable组件之前，查看它的基本信息和属性是很重要的。

Info TreeTable
Component Class org.primefaces.component.treetable.TreeTable
Component Type org.primefaces.component.TreeTable
Component Family org.primefaces.component
Renderer Type org.primefaces.component.TreeTableRenderer
Renderer Class org.primefaces.component.treetable.TreeTableRenderer
Name Default Type Description
id null String Unique identifier of the component
rendered true Boolean Boolean value to specify the rendering of thecomponent, when set to false component willnot be rendered.
binding null Object An el expression that maps to a server sideUIComponent instance in a backing bean
value null Object A TreeNode instance as the backing model.
var null String Name of the request-scoped variable used torefer each treenode.
widgetVar null String Name of the client side widget
style null String Inline style of the container element.
styleClass null String Style class of the container element.
selection null Object Selection reference.
selectionMode null String Type of selection mode.
scrollable false Boolean Whether or not the data should be scrollable.
scrollHeight null Integer Height of scrollable data.
scrollWidth null Integer Width of scrollable data.
tableStyle null String Inline style of the table element.
tableStyleClass null String Style class of the table element.
emptyMessage No records found String Text to display when there is no data to display.
resizableColumns false Boolean Defines if colums can be resized or not.
rowStyleClass null String Style class for each row.
liveResize false Boolean Columns are resized live in this mode withoutusing a resize helper.
required false Boolean Validation constraint for selection.
requiredMessage null String Message for required selection validation.
sortBy null ValueExpr Expression for default sorting.
sortOrder ascending String Defines default sorting order.
sortFunction null MethodExpr Custom pluggable sortFunction for defaultsorting.
nativeElements false Boolean In native mode, treetable uses nativecheckboxes.
dataLocale null Object Locale to be used in features such as sorting,defaults to view locale.
caseSensitiveSort false Boolean Case sensitivity for sorting, insensitive bydefault.

与Tree类似，TreeTable通过TreeNode实例来填充，该实例与根节点对应。TreeNode API具有分层的数据结构，并代表要在树中填充的数据。下面的示例向您展示了使用TreeTable组件显示的普通Java对象（POJO）文档实例。index7.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>							
	<p:treeTable value="#{treeTableManagedBean.root}" var="node">
		<p:column>
			<f:facet name="header">
				Name
			</f:facet>
			<h:outputText value="#{node.name}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				Author
			</f:facet>
			<h:outputText value="#{node.author}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				ID
			</f:facet>
			<h:outputText value="#{node.id}"></h:outputText>
		</p:column>				
	</p:treeTable>
</h:form>
</html>

package com.Olivia.prime.faces.data;

public class Document {
	private String name;
	private String id;
	private String author;
	
	public Document(String name, String id,String author){
		this.name = name;
		this.id = id;
		this.author = author;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getAuthor() {
		return author;
	}
	public void setAuthor(String author) {
		this.author = author;
	}
}

package com.Olivia.prime.faces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

import com.Olivia.prime.faces.data.Document;

@ManagedBean
@SessionScoped
public class TreeTableManagedBean {
	
	private TreeNode root = new DefaultTreeNode("Root Node", null);

	public TreeTableManagedBean(){
		// Populate Document Instances
		Document doc01 = new Document("Primefaces Tutorial","1","Primefaces Company");
		
		Document doc02 = new Document("Hibernate Tutorial","2","JournalDev");
		
		// Create Documents TreeNode
		TreeNode documents = new DefaultTreeNode(new Document("Documents","0","Documents"), this.root);
		// Create Document TreeNode
		TreeNode document01 = new DefaultTreeNode(doc01, documents);
		TreeNode document02 = new DefaultTreeNode(doc02, documents);
	}
	
	public TreeNode getRoot() {
		return root;
	}

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

Primefaces TreeTable – 选择

与树组件类似，节点选择是一种内置功能，您可以通过它来确定选择的类型；Single、multiple和checkbox是您可能使用的值。单个选择将绑定您选择的节点到一个TreeNode实例，而其他选择将使用TreeNode的数组。下面的示例展示了如何通过显示Growl消息来封装用户选择。此示例使用Primefaces提供的p:commandButton，稍后将对其进行讨论。index8.xhtml代码如下：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>			
	<p:growl id="message">
	</p:growl>				
	<p:treeTable value="#{treeTableManagedBean.root}" var="node" selectionMode="single"
		selection="#{treeTableManagedBean.singleSelectedNode}">
		<p:column>
			<f:facet name="header">
				Name
			</f:facet>
			<h:outputText value="#{node.name}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				Author
			</f:facet>
			<h:outputText value="#{node.author}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				ID
			</f:facet>
			<h:outputText value="#{node.id}"></h:outputText>
		</p:column>				
	</p:treeTable>
	<p:treeTable value="#{treeTableManagedBean.root}" var="node" selectionMode="multiple"
		selection="#{treeTableManagedBean.multipleSelectedNodes}">
		<p:column>
			<f:facet name="header">
				Name
			</f:facet>
			<h:outputText value="#{node.name}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				Author
			</f:facet>
			<h:outputText value="#{node.author}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				ID
			</f:facet>
			<h:outputText value="#{node.id}"></h:outputText>
		</p:column>				
	</p:treeTable>
	<p:treeTable value="#{treeTableManagedBean.root}" var="node" selectionMode="checkbox"
		selection="#{treeTableManagedBean.checkboxSelectedNodes}">
		<p:column>
			<f:facet name="header">
				Name
			</f:facet>
			<h:outputText value="#{node.name}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				Author
			</f:facet>
			<h:outputText value="#{node.author}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				ID
			</f:facet>
			<h:outputText value="#{node.id}"></h:outputText>
		</p:column>				
	</p:treeTable>	
	<p:commandButton value="Show Selected Documents" action="#{treeTableManagedBean.viewSelectedNodes}" process="@form" update="message">
	</p:commandButton>	
</h:form>
</html>

package com.Olivia.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

import com.Olivia.prime.faces.data.Document;

@ManagedBean
@SessionScoped
public class TreeTableManagedBean {
	
	private TreeNode root = new DefaultTreeNode("Root Node", null);
	private TreeNode singleSelectedNode;
	private TreeNode [] multipleSelectedNodes;
	private TreeNode [] checkboxSelectedNodes;

	public TreeTableManagedBean(){
		// Populate Document Instances
		Document doc01 = new Document("Primefaces Tutorial","1","Primefaces Company");	
		Document doc02 = new Document("Hibernate Tutorial","2","JournalDev");
		// Create Documents TreeNode
		TreeNode documents = new DefaultTreeNode(new Document("Documents","0","Documents"), this.root);
		// Create Document TreeNode
		TreeNode document01 = new DefaultTreeNode(doc01, documents);
		TreeNode document02 = new DefaultTreeNode(doc02, documents);
	}
	
	public TreeNode getRoot() {
		return root;
	}

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

	public TreeNode getSingleSelectedNode() {
		return singleSelectedNode;
	}

	public void setSingleSelectedNode(TreeNode singleSelectedNode) {
		this.singleSelectedNode = singleSelectedNode;
	}

	public TreeNode[] getMultipleSelectedNodes() {
		return multipleSelectedNodes;
	}

	public void setMultipleSelectedNodes(TreeNode[] multipleSelectedNodes) {
		this.multipleSelectedNodes = multipleSelectedNodes;
	}

	public TreeNode[] getCheckboxSelectedNodes() {
		return checkboxSelectedNodes;
	}

	public void setCheckboxSelectedNodes(TreeNode[] checkboxSelectedNodes) {
		this.checkboxSelectedNodes = checkboxSelectedNodes;
	}
	
	public String viewSelectedNodes(){
		String message = "You've selected documents :: ";
		message+="- "+((Document)this.singleSelectedNode.getData()).getName()+"\n";
		for(TreeNode node : this.multipleSelectedNodes){
			message+="- "+((Document)node.getData()).getName()+"\n";	
		}
		for(TreeNode node : this.checkboxSelectedNodes){
			message+="- "+((Document)node.getData()).getName()+"\n";	
		}		
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(message));
		return "";
	}
}

Primefaces TreeTable – Ajax行为事件和上下文菜单

TreeTable已经支持与Tree组件一样的Ajax行为事件。唯一的例外是colResize事件，当调整列宽时会触发该事件。ContextMenu的使用与Tree组件中的使用没有区别。不幸的是，我们现在使用的Primefaces 5.0免费版本存在一个严重问题，无法确定是否支持列宽调整事件的监听。但是，为了了解如何监听这种事件，下面提供了一个简单的示例：index9.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>							
	<p:treeTable value="#{treeTableManagedBean.root}" var="node" resizableColumns="true">
		<p:column>
			<f:facet name="header">
				Name
			</f:facet>
			<h:outputText value="#{node.name}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				Author
			</f:facet>
			<h:outputText value="#{node.author}"></h:outputText>
		</p:column>
		<p:column>
			<f:facet name="header">
				ID
			</f:facet>
			<h:outputText value="#{node.id}"></h:outputText>
		</p:column>				
		<p:ajax event="colResize" listener="#{treeTableManagedBean.colResizeListener}"></p:ajax>
	</p:treeTable>
</h:form>
</html>

// .. Some Required Code
	public void colResizeListener(ColumnResizeEvent e){
		String message ="Column resize event is thrown";
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(message));
	}

Primefaces TreeTable – 排序

在列级别设置sortBy表达式可以启用排序。 index10.xhtml代码：

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>							
	<p:treeTable value="#{treeTableManagedBean.root}" var="node">
		<p:column sortBy="#{node.name}">
			<f:facet name="header">
				Name
			</f:facet>
			<h:outputText value="#{node.name}"></h:outputText>
		</p:column>
		<p:column sortBy="#{node.author}">
			<f:facet name="header">
				Author
			</f:facet>
			<h:outputText value="#{node.author}"></h:outputText>
		</p:column>
		<p:column sortBy="#{node.id}">
			<f:facet name="header">
				ID
			</f:facet>
			<h:outputText value="#{node.id}"></h:outputText>
		</p:column>				
	</p:treeTable>
</h:form>
</html>

如果你希望页面加载时以排序方式显示TreeTable，请使用TreeTable的sortBy属性，可选的sortOrder和sortFunction属性用于定义默认排序顺序（升序或降序）和实际排序的Java方法。

Primefaces 树组件TreeNode TreeTable的摘要

树状和树表格组件被广泛用于展示结构化的层级数据。我们学习了如何正确使用这些组件以及所需的主要属性。请在下方评论中向我们提供贡献，并可下载下方的源代码以供使用。

下载PrimeFaces Tree项目

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