using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OracleClient;

public partial class DDL2JiLianDong : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        BindDrop();//如果不是提交回来就绑定列表框

        dListChild.Attributes.Add("onFocus", "" + this.myHidden.ClientID + ".value=this.options[this.selectedIndex].value");
        dListChild.Attributes.Add("onChange", "" + this.myHidden.ClientID + ".value=this.options[this.selectedIndex].value");
        dListChild.Attributes.Add("onBlur", "" + this.myHidden.ClientID + ".value=this.options[this.selectedIndex].value"); 
    }

    protected void BindDrop()
    {
        //获得传递过来的parent_id值,如果是第一次请求他为null
        string str = Request.QueryString["parent_id"];
        string str1 = dListParent.SelectedValue; ;
        //如果str加个字符串!=原来的字符串则说明触发过dListParent的onchange事件
        if ((str + "abc") != "abc")
        {
            //绑定 dListChild控件
            BindChild(str);//把传来的父DropDownList的value做为参数
        }
    }

    protected void BindChild(string str)
    {
        //通过js给包括dropdownlist任何控件添加的内容不会被保存状态
        //把参数转化成int
        int i = Convert.ToInt32(str);
        //定义个字符串用保存从数据库返回的数据
        string result = "";
        //先清空输出的东西
        Response.Clear();

        string connStr = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
        OracleConnection conn = new OracleConnection(connStr);
        string commStr = string.Format("select type_value,type_text from kout_phone_type where parent_id = {0}", i);
        OracleCommand comm = new OracleCommand(commStr, conn);
        conn.Open();
        OracleDataReader dr = comm.ExecuteReader();

        while (dr.Read())
        {
            result += "," + dr[0].ToString() + "|" + dr[1].ToString();
            //dListChild.Items.Add(new ListItem(dr[1].ToString(),dr[0].ToString()));
        }
        //把从数据库得到的信息输出到客户端
        Response.Write(result);
        //输出完成关闭Response,以免造成不必要的输出
        Response.Flush();
        Response.Close();
        dr.Close();
        conn.Close();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        //Response.Write(Request.Form["dListChild"].ToString());
        lblParentValue.Text = dListParent.SelectedValue.ToString();
        //lblChildValue.Text = dListChild.SelectedValue.ToString();
        lblChildValue.Text = this.myHidden.Value;
    }
}