昨天看到了.net中的TreeView，学习了一波TreeView的数据绑定，联想到EasyUi中的Tree的数据，觉得里面的逻辑差不多，就总结了一下两者的数据绑定。
前端页面和必要的JS如下
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TreeView_Study.aspx.cs" Inherits="StudyProgram.Pages.TreeView_Study" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <link href="../Content/easyui/themes/material/easyui.css" rel="stylesheet" type="text/css" /> <link href="../Content/easyui/themes/icon.css" rel="stylesheet" type="text/css" /> <script src="../Scripts/JQuery-1-10-2.js" type="text/javascript"></script> <script src="../Content/easyui/jquery.easyui.min.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { // $("#tt").tree({ // url: "treeJson.json", // method: "get" // }); $.ajax({ url: "?act=GetTreeJson1", type: 'post', dataType: 'json', success: function (data) { console.log(data); if (data != null) $("#tt").tree({ data: data }); }, error: function (data) {} }); }); //checkbox点击事件 function OnCheckEvent() { var objNode = event.srcElement; if (objNode.tagName != "INPUT" || objNode.type != "checkbox") return; //获得当前树结点 var ck_ID = objNode.getAttribute("ID"); var node_ID = ck_ID.substring(0, ck_ID.indexOf("CheckBox")) + "Nodes"; var curTreeNode = document.getElementById(node_ID); //级联选择 SetChildCheckBox(curTreeNode, objNode.checked); SetParentCheckBox(objNode); } //子结点字符串 var childIds = ""; //获取子结点ID数组 function GetChildIdArray(parentNode) { if (parentNode == null) return; var childNodes = parentNode.children; var count = childNodes.length; for (var i = 0; i < count; i++) { var tmpNode = childNodes[i]; if (tmpNode.tagName == "INPUT" && tmpNode.type == "checkbox") { childIds = tmpNode.id + ":" + childIds; } GetChildIdArray(tmpNode); } } //设置子结点的checkbox function SetChildCheckBox(parentNode, checked) { if (parentNode == null) return; var childNodes = parentNode.children; var count = childNodes.length; for (var i = 0; i < count; i++) { var tmpNode = childNodes[i]; if (tmpNode.tagName == "INPUT" && tmpNode.type == "checkbox") { tmpNode.checked = checked; } SetChildCheckBox(tmpNode, checked); } } //设置父结点的checkbox function SetParentCheckBox(childNode) { if (childNode == null) return; var parent = childNode.parentNode; if (parent == null || parent == "undefined") return; do { parent = parent.parentNode; } while (parent && parent.tagName != "DIV"); if (parent == "undefined" || parent == null) return; var parentId = parent.getAttribute("ID"); var objParent; if (parentId != "") { objParent = document.getElementById(parentId); childIds = ""; GetChildIdArray(objParent); } //判断子结点状态 childIds = childIds.substring(0, childIds.length - 1); var aryChild = childIds.split(":"); var result = false; //当子结点的checkbox状态有一个为true，其父结点checkbox状态即为true,否则为false for (var i in aryChild) { var childCk = document.getElementById(aryChild[i]); if (childCk != null && childCk.checked) result = true; } if (parentId != null) { parentId = parentId.replace("Nodes", "CheckBox"); var parentCk = document.getElementById(parentId); if (parentCk == null) return; if (result) parentCk.checked = true; else parentCk.checked = false; SetParentCheckBox(parentCk); } } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:TreeView ID="SysModuleTree" runat="server" ShowCheckBoxes="All" ImageSet="Arrows"> <HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" /> <NodeStyle Font-Names="微软雅黑" Font-Size="12pt" ForeColor="Black" HorizontalPadding="5px" NodeSpacing="0px" VerticalPadding="0px" /> <%--根--%> <ParentNodeStyle Font-Bold="False" ForeColor="Blue" /> <%--父级--%> <SelectedNodeStyle Font-Underline="True" ForeColor="#5555DD" HorizontalPadding="0px" VerticalPadding="0px" /> <%--叶子--%> </asp:TreeView> <br /> <br /> <asp:TreeView ID="Treeview1" runat="server" ShowCheckBoxes="All" ImageSet="Arrows" CssClass="TreeMenu"> <HoverNodeStyle ForeColor="#5555DD" /> <NodeStyle Font-Names="微软雅黑" Font-Size="10pt" ForeColor="Black" HorizontalPadding="5px" NodeSpacing="0px" VerticalPadding="0px" /> <RootNodeStyle Font-Bold="True" /> <ParentNodeStyle Font-Bold="True" ForeColor="#653CFC" /> <SelectedNodeStyle ForeColor="#5555DD" HorizontalPadding="0px" VerticalPadding="0px" /> </asp:TreeView> <br /> <br /> <ul id="tt"> </ul> <%-- <ul id="Ul1" class="easyui-tree"> <li><span>Folder</span> <ul> <li><span>Sub Folder 1</span> <ul> <li><span><a href="#">File 11</a></span></li> <li><span>File 12</span></li> <li><span>File 13</span></li> </ul> </li> <li><span>File 2</span></li> <li><span>File 3</span></li> </ul> </li> <li><span>File21</span></li> </ul>--%> </div> </form> </body> </html>
数据库数据格式：
后台代码：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; using StudyProgram.Common; using Newtonsoft.Json; namespace StudyProgram.Pages { public partial class TreeView_Study : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { var act = Request["act"]; if (act != null) { try { var res = GetType().GetMethod(act, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance).Invoke(this, null); if (res != null) Response.Write(res); } catch (Exception ex) { Response.Write(JsonConvert.SerializeObject(ex)); } Response.End(); } if (!IsPostBack) { var dt = GetDataTable(); Treeview1.Attributes.Add("onClick", "OnCheckEvent()"); TreeBind(SysModuleTree, dt, null, null, "Id", "P_id", "Text"); TreeBind2(dt, Treeview1.Nodes, null, "Id", "P_id", "Text"); var aa = GetTreeJson(dt); } } void TreeBind(TreeView treeView, DataTable dt, TreeNode p_Node, string pid_val, string id, string pid, string text) { DataView dv = dt.DefaultView; TreeNode tn; string filter = string.IsNullOrEmpty(pid_val) ? pid + " is null" : string.Format(" {0} ={1} ", pid, pid_val); dv.RowFilter = filter;//DV的筛选数据比DataTable好 foreach (DataRowView row in dv) { tn = new TreeNode(); tn.Value = row[id] + ""; tn.Text = row[text] + ""; if (p_Node == null) //添加根节点 treeView.Nodes.Add(tn); else p_Node.ChildNodes.Add(tn);//添加子节点 TreeBind(treeView, dt, tn, tn.Value, id, pid, text);//递归 绑定节点下面的子节点中的子节点 } } void TreeBind2(DataTable dt, TreeNodeCollection tnc, string pid_val, string id, string pid, string text) { DataView dv = dt.DefaultView; TreeNode tn; string filter = string.IsNullOrEmpty(pid_val) ? pid + " is null" : string.Format(pid + "='{0}'", pid_val); dv.RowFilter = filter;//筛选数据 foreach (DataRowView drv in dv) { tn = new TreeNode();//建立一个新节点 tn.Value = drv[id].ToString(); tn.Text = drv[text].ToString(); tnc.Add(tn);//将该节点加入到TreeNodeCollection（节点集合）中 TreeBind2(dt, tn.ChildNodes, tn.Value, id, pid, text);//递归 } } DataTable GetDataTable() { string ConnectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"]; return DBHelper.ExecuteDataset(ConnectionString, CommandType.Text, " SELECT * FROM [dbo].[T_Tree] ").Tables[0]; } public string GetTreeJson1() { DataTable dt = GetDataTable(); return TreeHelper.GetTreeJsonTest(dt, "P_id", "Id", "Text", null); } string GetTreeJson(DataTable dt) { return TreeHelper.GetTreeJsonTest(dt, "P_id", "Id", "Text", null); } } }
EasyUi tree的TreeHelper如下：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Data; using System.Text; using Newtonsoft.Json; using System.Reflection; namespace StudyProgram.Common { /// <summary> /// Tree帮助类 /// </summary> public class TreeHelper { /// <summary> /// 获取EasyUi——tree的JSON格式 /// </summary> /// <param name="tabel">数据</param> /// <param name="pid">父Id的字段名</param> /// <param name="id">id的字段名</param> /// <param name="text">文本字段名</param> /// <param name="p_val">根节点的父Id的值（0或者null等等）</param> /// <returns></returns> public static string GetTreeJsonTest(DataTable tabel, string pid, string id, string text, string p_val) { List<Tree> list = new List<Tree>(); string filer = string.IsNullOrEmpty(p_val) ? pid + " is null " : string.Format("{0}='{1}'", pid, p_val); DataRow[] rows = tabel.Select(filer);//筛选出根节点 foreach (DataRow dr in rows) { Tree tree = new Tree(); tree.id = dr[id] + ""; tree.p_id = dr[pid] + ""; tree.text = dr[text] + ""; tree.children = GetChild(tree, tabel, pid, id, text);//获取子节点 list.Add(tree); } return JsonConvert.SerializeObject(list);//转JSON } /// <summary> /// 获取子节点 /// </summary> /// <param name="node">父节点</param> /// <param name="dt">数据源</param> /// <param name="pid">父Id的字段名</param> /// <param name="id">id的字段名</param> /// <param name="text">文本字段名</param> /// <returns></returns> private static List<Tree> GetChild(Tree node, DataTable dt, string pid, string id, string text) { List<Tree> lst = new List<Tree>(); DataRow[] rows = dt.Select(pid + " = " + node.id);//筛选pid为父节点的Id的节点（即父节点node的所有子节点） foreach (var row in rows) { Tree n = new Tree(); n.id = row[id] + ""; n.text = row[text] + ""; n.p_id = row[pid] + ""; lst.Add(n); DataRow[] dr = dt.Select(pid + "=" + n.id); if (dr.Length > 0) n.children = GetChild(n, dt, pid, id, text); } return lst; } /// <summary> /// List转EasyUi_tree格式 /// </summary> /// <param name="lstData"></param> /// <param name="p_val"></param> /// <returns></returns> public static List<Tree> GetTreeJsonByList(List<Data> lstData, string p_val) { List<Tree> lstTree = new List<Tree>(); if (lstData != null) { var lstRoot = lstData.Where(c => string.IsNullOrEmpty(p_val) ? c.P_id == null : c.P_id == Convert.ToInt32(p_val)).ToList();//找到根节点 foreach (var ll in lstRoot) { Tree tree = new Tree(); tree.id = ll.Id + ""; tree.p_id = ll.P_id + ""; tree.text = ll.Text; tree.children = GetTreeJsonByList(lstData, ll.Id + ""); lstTree.Add(tree); } } return lstTree; } /// <summary> /// DataTable转List /// </summary> /// <typeparam name="T"></typeparam> /// <param name="dt"></param> /// <returns></returns> public static List<T> ConvertToList<T>(DataTable dt) where T : new() { List<T> list = new List<T>(); PropertyInfo[] props = typeof(T).GetProperties(); foreach (DataRow dr in dt.Rows) { T t = new T(); foreach (PropertyInfo pro in props) { if (dt.Columns.Contains(pro.Name)) { if (!pro.CanWrite) continue;//属性不能写入,直接写入下个属性 object obj = dr[pro.Name]; if (obj != DBNull.Value) pro.SetValue(t, obj, null); } } list.Add(t); } return list; } /// <summary> /// List转DataTable /// </summary> /// <typeparam name="T"></typeparam> /// <param name="list"></param> /// <returns></returns> public static DataTable ConvertToDataTable<T>(List<T> list) where T : new() //在方法前面定义T，后面Where作为泛型约束 { DataTable dt = new DataTable(); PropertyInfo[] props = typeof(T).GetProperties(); foreach (var p in props) dt.Columns.Add(p.Name, p.Name.GetType()); foreach (var t in list) { DataRow n_row = dt.NewRow(); foreach (var p in props) n_row[p.Name] = p.GetValue(t, null); dt.Rows.Add(n_row); } return dt; } } public class Tree { public string id { get; set; } public string text { get; set; } public string p_id { get; set; }//父id可以不需要 //public string iconCls //{ // get { return "icon-save"; }//设置Tree的图标，默认是文件夹 //} public List<Tree> children { get; set; } } public class Data { public int Id { get; set; } public string Text { get; set; } public int? P_id { get; set; } } }
效果图如下：
