TreeView 的动态加载和无刷新例子 新手分不多望大家见谅

Question

TreeView 的动态加载和无刷新例子 
     希望做一个可以从数据库中动态添加Tree的例子,无刷新的.谢谢.谢谢.在线等.希望  孟大哥  . SP1234 等高人给予指点.

Answer 1

google "AjaxTree" ，多呢

Answer 2

http://blog.programfan.com/article.asp?id=23571http://www.xyhot.com/article.asp?id=116

Answer 3

前台：
<asp:TreeView runat="server" ID="tvRegion" OnTreeNodePopulate="tvRegion_TreeNodePopulate"
                        PopulateNodesFromClient="true" ShowCheckBoxes="All" ShowLines="True">
                        <Nodes>
                            <asp:TreeNode Text="中国" ToolTip="zg" Value="zg"
                                Expanded="false" PopulateOnDemand="true" />
                        </Nodes>
                    </asp:TreeView>后台：
protected void tvRegion_TreeNodePopulate(object sender, TreeNodeEventArgs e)
    {
        RegionSet rs = RegionSet.GetInstance("EmedMis2");
        DataSet dsRegion = rs.getFirstChilds(e.Node.Value);
        
        foreach (DataRow  dr in dsRegion.Tables[0].Rows)//目录节点
        {
            TreeNode newNode = new TreeNode();
            newNode.PopulateOnDemand = true;//节点允许被展开
            newNode.Text = dr["area_name"].ToString();
            newNode.ToolTip = dr["area_name"].ToString();
            newNode.Value = dr["area_id"].ToString(); //节点的完整路径名
            e.Node.ChildNodes.Add(newNode);//添加目录节点
            //将已经设置过的项，回填到数控件(checked为true)
            if (ViewState["ds"] != null)
            {
                foreach (DataRow dr1 in ((DataSet)ViewState["ds"]).Tables[0].Rows)
                {
                    if (newNode.Value == dr1["Region_ID"].ToString())
                        newNode.Checked = true;  
                }
            }
        }
    }点击树节点不刷新方法：newNode.NavigateUrl = "javascript:return false;";