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樹(Tree)可以在一個空的 <ul> 元素中定義,可使用 javascript 加載數據。
在body中添加ul標簽
<ul id="tt"></ul>
然后在使用javascript代碼加載數據
使用JSON加載數據
$('#tt').tree({ url:'treedata.json'});
每個節點可以包括下列屬性:
id:節點的 id,它對于加載遠程數據很重要。
text:要顯示的節點文本。
state:節點狀態,'open' 或 'closed',默認是 'open'。當設置為 'closed' 時,該節點有子節點,并且將從遠程站點加載它們。
checked:指示節點是否被選中。
attributes:給一個節點添加的自定義屬性。
children:定義了一些子節點的節點數組。
數據格式示例:
[{ "id":1, "text":"Folder1", "iconCls":"icon-save", "children":[{ "text":"File1", "checked":true }] }]
很多事件的回調函數需要 'node' 參數,它包括下列屬性:
id:綁定到節點的標識值。
text:要顯示的文本。
iconCls:用來顯示圖標的 css class。
checked:節點是否被選中。
state:節點狀態,'open' 或 'closed'。
attributes:綁定到節點的自定義屬性。
target:目標的 DOM 對象。
JSP+Servlet+JSON樹形菜單示例:
數據庫表:
數據庫表SQL:
CREATE TABLE `menu_info` ( `menu_id` int(11) NOT NULL auto_increment, `men_menu_id` int(11) default NULL, `menu_name` varchar(100) default NULL, `menu_url` varchar(500) default NULL, `menu_seq` int(11) default NULL, `menu_desc` varchar(1000) default NULL, `role_mark` varchar(10) default NULL, PRIMARY KEY (`menu_id`), KEY `FK_Reference_2` (`men_menu_id`), CONSTRAINT `FK_Reference_2` FOREIGN KEY (`men_menu_id`) REFERENCES `menu_info` (`menu_id`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records -- ---------------------------- INSERT INTO `menu_info` VALUES ('1', null, '系統管理', null, null, null, null); INSERT INTO `menu_info` VALUES ('2', '1', '部門管理', null, null, null, null); INSERT INTO `menu_info` VALUES ('3', '4', '車輛管理', null, null, null, null); INSERT INTO `menu_info` VALUES ('4', '1', '駕駛員管理', null, null, null, null); INSERT INTO `menu_info` VALUES ('6', '1', '人員管理', null, null, null, null);
數據庫DAO查詢數據:
package com.car.system.dao.impl; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.List; import com.car.po.MenuInfo; import com.car.po.UserInfo; import com.car.system.dao.MenuInfoDAO; import com.car.utils.DB; public class MenuInfoDAOImpl implements MenuInfoDAO{ @Override public List<MenuInfo> getList() { Connection con = null; PreparedStatement pre = null; ResultSet res = null; try { String sql = "select * from menu_info"; con = DB.getDB(); pre = con.prepareStatement(sql); res = pre.executeQuery(); List<MenuInfo> list = new ArrayList<MenuInfo>(); while (res.next()) { MenuInfo menu = new MenuInfo(); menu.setMenuId(res.getInt("menu_id")); menu.setMenuName(res.getString("menu_name")); menu.setPmenuId(res.getInt("men_menu_id")); list.add(menu); } return list; } catch (Exception e) { e.printStackTrace(); } finally { DB.close(con, pre, res); } return null; } }
編寫TreeNode類
package com.car.po; import java.util.List; public class TreeNode { private int id; private String text; private String url; private int pid; private List<TreeNode> children; public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getText() { return text; } public void setText(String text) { this.text = text; } public int getPid() { return pid; } public void setPid(int pid) { this.pid = pid; } public List<TreeNode> getChildren() { return children; } public void setChildren(List<TreeNode> children) { this.children = children; } }
編寫JSON公共轉換類
package com.car.utils; import java.util.ArrayList; import java.util.List; import com.car.po.TreeNode; public class JSON { public static List<TreeNode> buildtree(List<TreeNode> nodes, int id) { List<TreeNode> treeNodes = new ArrayList<TreeNode>(); for (TreeNode treeNode : nodes) { TreeNode node = new TreeNode(); node.setId(treeNode.getId()); node.setText(treeNode.getText()); node.setUrl(treeNode.getUrl()); if (id == treeNode.getPid()) { node.setChildren(buildtree(nodes, node.getId())); treeNodes.add(node); } } return treeNodes; } }
編寫Servlet類:
package com.car.system.servlet.menuinfo; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import com.car.po.MenuInfo; import com.car.po.TreeNode; import com.car.system.dao.MenuInfoDAO; import com.car.system.dao.impl.MenuInfoDAOImpl; import com.car.utils.JSON; /** * Servlet implementation class MenuInfoServlet */ @WebServlet("/menuInfolist") public class MenuInfoServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public MenuInfoServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("--------------"); this.doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { MenuInfoDAO dao = new MenuInfoDAOImpl(); List<MenuInfo> list = dao.getList(); List<TreeNode> nodes=new ArrayList<TreeNode>(); for(MenuInfo menu:list){ TreeNode treeNode = new TreeNode(); if(menu.getMenuId()==null){ treeNode.setId(0); }else{ treeNode.setId(menu.getMenuId()); } treeNode.setUrl("http://www.baidu.com"); treeNode.setPid(menu.getPmenuId()); treeNode.setText(menu.getMenuName()); nodes.add(treeNode); } List<TreeNode> treeNodes=JSON.buildtree(nodes,0); JSONArray jsonArray = JSONArray.fromObject(treeNodes); response.setContentType("text/json"); response.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); out.print(jsonArray); out.flush(); out.close(); } }
編寫Tree.jsp頁面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <base href="<%=basePath%>"> <title>首頁</title> <link rel="stylesheet" type="text/css" href="resource/easyui/themes/default/easyui.css"> <link rel="stylesheet" type="text/css" href="resource/easyui/themes/icon.css"> <script type="text/javascript" src="resource/easyui/jquery.min.js"></script> <script type="text/javascript" src="resource/easyui/jquery.easyui.min.js"></script> <script type="text/javascript"> $().ready(function(){ $('#tt').tree({ url:'menuInfolist', onContextMenu: function(e, node){ e.preventDefault(); $('#tt').tree('select', node.target); $('#mm').menu('show', { left: e.pageX, top: e.pageY, onClick:function(item){ var text = item.text; if(item.text=='添加'){ alert(node.url); window.mainframe.location="add"; }else if(item.text=='修改'){ window.mainframe.location="update"; }else if(item.text=='刪除'){ window.mainframe.location="delete"; } } }); } }); }); </script> </head> <body> <ul id="tt"> </ul> <div id="mm" class="easyui-menu" > <div data-options="iconCls:'icon-add'" >添加</div> <div data-options="iconCls:'icon-edit'">修改</div> <div data-options="iconCls:'icon-remove'">刪除</div> </div> <iframe name="mainframe"></iframe> </body> </html>
效果圖:
參考API地址:
tree:http://www.jeasyui.net/plugins/185.html
menu: http://www.jeasyui.net/plugins/163.html
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