asp.net使用ajax省市二级联动
aspx页面
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>adduser</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<script language="javascript">
//jb函数会根据不同的浏览器初始化个xmlhttp对象
function jb()
{
var A=null;
try
{
A=new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e)
{
try
{
A=new ActiveXObject("Microsoft.XMLHTTP");
}
catch(oc)
{
A=null
}
}
if ( !A && typeof XMLHttpRequest != "undefined" )
{
A=new XMLHttpRequest()
}
return A
}
//下面Go函数是父列表框改变的时候调用，参数是选择的条目
function Go(obj)
{
//得到选择框的下拉列表的value
var svalue = obj.value;
//定义要处理数据的页面
var weburl = "adduser.aspx?parent_id="+svalue;
//初始化个xmlhttp对象
var xmlhttp = jb();
//提交数据，第一个参数最好为get，第三个参数最好为true
xmlhttp.open("get",weburl,true);
// alert(xmlhttp.responseText);
//如果已经成功的返回了数据
xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)//4代表成功返回数据
{
var result = xmlhttp.responseText;//得到服务器返回的数据
//先清空ddlC的所有下拉项
document.getElementById("ddlC").length = 0;
//给ddlC加个全部型号的,注意是Option不是option
document.getElementById("ddlC").options.add(new Option("请选择","0"));
if(result!="")//如果返回的数据不是空
{
//把收到的字符串按照，分割成数组
var allArray = result.split(",");
//循环这个数组，注意是从1开始，因为收到的字符串第一个字符是，号，所以分割后第一个数组为空
for(var i=1;i<allArray.length;i++)
{
//在把这个字符串按照|分割成数组
var thisArray = allArray[i].split("|");
//为ddlC添加条目
document.getElementById("ddlC").options.add(new Option(thisArray[1].toString(),thisArray[0].toString()));
}
}
}
}
//发送数据，请注意顺序和参数，参数一定为null或者""
xmlhttp.send(null);
}
</script>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" style="Z-INDEX: 101; LEFT: 8px; WIDTH: 656px; POSITION: absolute; TOP: 8px; HEIGHT: 620px"
cellSpacing="1" cellPadding="1" border="0">
<TR>
<TD style="WIDTH: 71px; HEIGHT: 17px"><FONT face="宋体">所在地</FONT></TD>
<TD style="HEIGHT: 17px"><asp:dropdownlist id="ddlS" runat="server" onchange="Go(this)"></asp:dropdownlist><asp:dropdownlist id="ddlC" runat="server"></asp:dropdownlist></TD>
<TD style="HEIGHT: 17px"><FONT face="宋体"></FONT></TD>
</TR>
<TR>
<TD align="center" colSpan="3"><FONT face="宋体"><asp:button id="btnOk" runat="server" Text="确定并提交" Width="152px"></asp:button></FONT></TD>
</TR>
</TABLE>
</form>
</body>
</HTML>
<HTML>
<HEAD>
<title>adduser</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<script language="javascript">
//jb函数会根据不同的浏览器初始化个xmlhttp对象
function jb()
{
var A=null;
try
{
A=new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e)
{
try
{
A=new ActiveXObject("Microsoft.XMLHTTP");
}
catch(oc)
{
A=null
}
}
if ( !A && typeof XMLHttpRequest != "undefined" )
{
A=new XMLHttpRequest()
}
return A
}
//下面Go函数是父列表框改变的时候调用，参数是选择的条目
function Go(obj)
{
//得到选择框的下拉列表的value
var svalue = obj.value;
//定义要处理数据的页面
var weburl = "adduser.aspx?parent_id="+svalue;
//初始化个xmlhttp对象
var xmlhttp = jb();
//提交数据，第一个参数最好为get，第三个参数最好为true
xmlhttp.open("get",weburl,true);
// alert(xmlhttp.responseText);
//如果已经成功的返回了数据
xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)//4代表成功返回数据
{
var result = xmlhttp.responseText;//得到服务器返回的数据
//先清空ddlC的所有下拉项
document.getElementById("ddlC").length = 0;
//给ddlC加个全部型号的,注意是Option不是option
document.getElementById("ddlC").options.add(new Option("请选择","0"));
if(result!="")//如果返回的数据不是空
{
//把收到的字符串按照，分割成数组
var allArray = result.split(",");
//循环这个数组，注意是从1开始，因为收到的字符串第一个字符是，号，所以分割后第一个数组为空
for(var i=1;i<allArray.length;i++)
{
//在把这个字符串按照|分割成数组
var thisArray = allArray[i].split("|");
//为ddlC添加条目
document.getElementById("ddlC").options.add(new Option(thisArray[1].toString(),thisArray[0].toString()));
}
}
}
}
//发送数据，请注意顺序和参数，参数一定为null或者""
xmlhttp.send(null);
}
</script>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" style="Z-INDEX: 101; LEFT: 8px; WIDTH: 656px; POSITION: absolute; TOP: 8px; HEIGHT: 620px"
cellSpacing="1" cellPadding="1" border="0">
<TR>
<TD style="WIDTH: 71px; HEIGHT: 17px"><FONT face="宋体">所在地</FONT></TD>
<TD style="HEIGHT: 17px"><asp:dropdownlist id="ddlS" runat="server" onchange="Go(this)"></asp:dropdownlist><asp:dropdownlist id="ddlC" runat="server"></asp:dropdownlist></TD>
<TD style="HEIGHT: 17px"><FONT face="宋体"></FONT></TD>
</TR>
<TR>
<TD align="center" colSpan="3"><FONT face="宋体"><asp:button id="btnOk" runat="server" Text="确定并提交" Width="152px"></asp:button></FONT></TD>
</TR>
</TABLE>
</form>
</body>
</HTML>
cs后台代码
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.SqlClient;
public partial class adduser : System.Web.UI.Page
{
private SqlConnection con;
private SqlDataAdapter da;
private DataSet ds;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
con=new SqlConnection("server=.;database=evs;uid=sa;pwd=wq");
da=new SqlDataAdapter("select * from province",con);
ds = new DataSet();
da.Fill(ds, "province");
ds.Tables["province"].DefaultView.Sort = "id ASC";
ddlS.DataSource = ds.Tables["province"].DefaultView;
ddlS.DataValueField = "id";
ddlS.DataTextField = "province";
ddlS.DataBind();
}
BindDrop();
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write(ddlS.SelectedItem.Text);
Response.Write(ddlC.SelectedItem.Text);
}
protected void BindDrop()
{
string str = Request.QueryString["parent_id"];
string str1 = ddlS.SelectedValue;
Response.Write(str1);
//如果str加个字符串!=原来的字符串则说明触发过ddlS的onchange事件
if ((str + "abc") != "abc")
{
//绑定 ddlC控件
BindChild(str);//把传来的父DropDownList的value做为参数
}
else
BindParent(str1);
}
protected void BindParent(string str)
{
//如果是第一次请求或者是刷新这个页面则根据ddlS的值来选择
//把参数转化成int
int i = Convert.ToInt32(str);
ddlC.Items.Clear();
ddlC.Items.Add(new ListItem("请选择", "0"));
//得到数据库连接字符串
string connStr = "server=.;database=evs;uid=sa;pwd=wq";
//初始化个conn对象
SqlConnection conn = new SqlConnection(connStr);
//数据库语句
string commStr = string.Format("select city,id from city where provid={0}", i);
//建立数据库命令对象
SqlCommand comm = new SqlCommand(commStr, conn);
//打开数据库
conn.Open();
//执行命令
SqlDataReader dr = comm.ExecuteReader();
//循环dr，给ddlS添加条目
while (dr.Read())
{
ddlC.Items.Add(new ListItem(dr[0].ToString(), dr[1].ToString()));
//也可以这样
//ddlS.Items.Add(new ListItem(dr["phone_text"].ToString(),dr["phone_value"].ToString()));
}
ddlC.ClearSelection();
ddlS.Items[0].Selected = false;
//添加下面这话的意思是当点提交按钮提交窗体的时候第二个ddlC的状态能够得到保存
ddlC.SelectedValue = Request.Form["ddlC"];
dr.Close();
conn.Close();
}
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);
string result = "";
Response.Clear();
string connStr = "server=.;database=evs;uid=sa;pwd=wq";
SqlConnection conn = new SqlConnection(connStr);
SqlCommand comm = conn.CreateCommand();
string commStr = string.Format("select city,id from city where provid={0}", i);
comm.CommandText = commStr;
conn.Open();
SqlDataReader dr = comm.ExecuteReader();
while (dr.Read())
{
result += "," + dr[1].ToString() + "|" + dr[0].ToString();
}
Response.Write(result);
Response.Flush();
Response.Close();
dr.Close();
conn.Close();
}
protected void Button1_Click1(object sender, EventArgs e)
{
Response.Write(ddlS.SelectedItem.Text);
Response.Write(ddlC.SelectedItem.Text);
}
}
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.SqlClient;
public partial class adduser : System.Web.UI.Page
{
private SqlConnection con;
private SqlDataAdapter da;
private DataSet ds;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
con=new SqlConnection("server=.;database=evs;uid=sa;pwd=wq");
da=new SqlDataAdapter("select * from province",con);
ds = new DataSet();
da.Fill(ds, "province");
ds.Tables["province"].DefaultView.Sort = "id ASC";
ddlS.DataSource = ds.Tables["province"].DefaultView;
ddlS.DataValueField = "id";
ddlS.DataTextField = "province";
ddlS.DataBind();
}
BindDrop();
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write(ddlS.SelectedItem.Text);
Response.Write(ddlC.SelectedItem.Text);
}
protected void BindDrop()
{
string str = Request.QueryString["parent_id"];
string str1 = ddlS.SelectedValue;
Response.Write(str1);
//如果str加个字符串!=原来的字符串则说明触发过ddlS的onchange事件
if ((str + "abc") != "abc")
{
//绑定 ddlC控件
BindChild(str);//把传来的父DropDownList的value做为参数
}
else
BindParent(str1);
}
protected void BindParent(string str)
{
//如果是第一次请求或者是刷新这个页面则根据ddlS的值来选择
//把参数转化成int
int i = Convert.ToInt32(str);
ddlC.Items.Clear();
ddlC.Items.Add(new ListItem("请选择", "0"));
//得到数据库连接字符串
string connStr = "server=.;database=evs;uid=sa;pwd=wq";
//初始化个conn对象
SqlConnection conn = new SqlConnection(connStr);
//数据库语句
string commStr = string.Format("select city,id from city where provid={0}", i);
//建立数据库命令对象
SqlCommand comm = new SqlCommand(commStr, conn);
//打开数据库
conn.Open();
//执行命令
SqlDataReader dr = comm.ExecuteReader();
//循环dr，给ddlS添加条目
while (dr.Read())
{
ddlC.Items.Add(new ListItem(dr[0].ToString(), dr[1].ToString()));
//也可以这样
//ddlS.Items.Add(new ListItem(dr["phone_text"].ToString(),dr["phone_value"].ToString()));
}
ddlC.ClearSelection();
ddlS.Items[0].Selected = false;
//添加下面这话的意思是当点提交按钮提交窗体的时候第二个ddlC的状态能够得到保存
ddlC.SelectedValue = Request.Form["ddlC"];
dr.Close();
conn.Close();
}
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);
string result = "";
Response.Clear();
string connStr = "server=.;database=evs;uid=sa;pwd=wq";
SqlConnection conn = new SqlConnection(connStr);
SqlCommand comm = conn.CreateCommand();
string commStr = string.Format("select city,id from city where provid={0}", i);
comm.CommandText = commStr;
conn.Open();
SqlDataReader dr = comm.ExecuteReader();
while (dr.Read())
{
result += "," + dr[1].ToString() + "|" + dr[0].ToString();
}
Response.Write(result);
Response.Flush();
Response.Close();
dr.Close();
conn.Close();
}
protected void Button1_Click1(object sender, EventArgs e)
{
Response.Write(ddlS.SelectedItem.Text);
Response.Write(ddlC.SelectedItem.Text);
}
}
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