ztree的非同步載入
阿新 • • 發佈：2019-02-01
非同步載入：是指在資料量大的情況下，預設只加載根節點，當點選這個節點的時候才去載入這個節點下的子節點，不會一下子全部加載出資料，提高了查詢資料的效率。
1.先引入ztree外掛到靜態檔案目錄下，包含js和css
2.建一個節點的實體類
public class TreeNode { private String id; private String pId; private String name; private Boolean isParent; private Boolean hasChild; private String level; public String getLevel() { return level; } public void setLevel(String level) { this.level = level; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getpId() { return pId; } public void setpId(String pId) { this.pId = pId; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Boolean getIsParent() { return isParent; } public void setIsParent(Boolean isParent) { this.isParent = isParent; } public Boolean getHasChild() { return hasChild; } public void setHasChild(Boolean hasChild) { this.hasChild = hasChild; } public TreeNode(String id, String pId, String name, Boolean isParent, Boolean hasChild,String level) { super(); this.id = id; this.pId = pId; this.name = name; this.isParent = isParent; this.hasChild = hasChild; this.level=level; } }
3.相關jsp：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <HTML> <HEAD> <TITLE> ZTREE DEMO </TITLE> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" href="<%=basePath %>/static/css/zTreeStyle/zTreeStyle.css" type="text/css"> <script type="text/javascript" src="<%=basePath %>/static/js/jquery-1.4.4.min.js"></script> <script type="text/javascript" src="<%=basePath %>/static/js/jquery.ztree.core-3.1.js"></script> <script type="text/javascript"> $(document).ready(function(){ initMyZtree(); }); var zNodes=""; var setting = { view: { selectedMulti: false, fontCss: setFontCss }, async: { enable: true, url:"getZtree.do", autoParam:["id"] }, callback: { beforeClick: beforeClickZtree } }; function initMyZtree(){ $.ajax({ type: "POST", dataType: "json", url: 'getZtree.do', success: function(data) { zNodes=data; $.fn.zTree.init($("#treeDemo"), setting, zNodes); } }); } //單擊事件 function beforeClickZtree(treeId, treeNode){ alert(treeNode.id+","+treeNode.name); } //設定字型 顏色 function setFontCss(treeId, treeNode) { if(treeNode.level==0){ return {'font-weight':'bold','color':'red'}; }else if(treeNode.level==1){ return {'font-weight':'bold','color':'green'}; }else if(treeNode.level==2){ return {'font-weight':'bold','color':'blue'}; }else{ return {}; } }; </script> </head> <body> <ul id="treeDemo" class="ztree"></ul> </body> </html>
4.controller處理:
資料是自己做的，沒有查資料庫
5.預覽：/** * ztree * @return * @throws Exception */ @RequestMapping(value="getZtree.do") @ResponseBody public String LoadTree(HttpServletResponse response,HttpServletRequest request) throws Exception { String id=request.getParameter("id"); System.out.println("*********"+id+"**********"); if("null".equals(id)||"".equals(id)||id==null){ id="0"; } List<TreeNode> list=new ArrayList<TreeNode>(); //所有 list.add(new TreeNode("CPIC","0","A",true,true,"0")); list.add(new TreeNode("C01","CPIC","B",true,true,"1")); list.add(new TreeNode("C02","CPIC","C",true,true,"1")); list.add(new TreeNode("C001","C01","D",true,false,"2")); list.add(new TreeNode("C002","C02","E",true,false,"2")); List<TreeNode> relist=new ArrayList<TreeNode>(); //需要的 JSONArray jarray=new JSONArray(); try { for (TreeNode t : list) { if(t.getpId().equals(id)){ relist.add(t); } } } catch (Exception e) { e.printStackTrace(); } jarray.addAll(relist); System.out.println(jarray.toString()); response.setCharacterEncoding("utf-8"); PrintWriter pw = null; try { pw = response.getWriter(); pw.write(jarray.toString()); } catch (IOException e) { e.printStackTrace(); } pw.flush(); pw.close(); return null; }
大功告成，是不是很簡單
下面附原始碼：https://download.csdn.net/download/yufeng005/10283997