asp.net实现树形下拉列表

来源：互联网发布：螳螂知乎编辑：程序博客网时间：2024/05/18 02:35

一、后台程序代码：

public void ResponseTypeTree(){string sel = "";DataSet ds = new DataSet();ds = xjdata.GetNewsTypeDataSetByParentID("0");dv = xjdata.GetNewsTypeDataSetByParentID().Tables[0].DefaultView;Response.Write("<option value=0 selected>选择类别</option>");for (int i = 0; i < ds.Tables[0].Rows.Count; i++){Response.Write("<option value=" + ds.Tables[0].Rows[i]["id"].ToString() + ">├" + ds.Tables[0].Rows[i]["name"].ToString() + "</option>");this.GetChildType(ds.Tables[0].Rows[i]["id"].ToString(), "");if (str != ""){Response.Write(str);str = "";}}if (str != ""){Response.Write(str);}}private void GetChildType(string parentcode, string str1){dv.RowFilter = "parentid='" + parentcode + "'";dv.Sort = "orderid asc";int a = dv.Count;string imgstr = "";string sel = "";imgstr = str1 + " ";//if (dv.Count > 0)//{// imgsrt = "<img src="images/folderHR.gif" mce_src="images/folderHR.gif" width=18 height=18>";//}if (dv.Count == 0)return;for (int i = 0; i < a; i++){str += "<option value=" + dv[i]["id"].ToString() + " >│" + imgstr + "└" + dv[i]["name"].ToString() + "</option> ";this.GetChildType(dv[i]["id"].ToString(), imgstr);dv.RowFilter = "parentid='" + parentcode + "'";dv.Sort = "orderid asc";}}

二、前台页面调用：