HTML> HEAD> title>Ajax實現(xiàn)無刷新三聯(lián)動下拉框/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"> //城市------------------------------ function cityResult() { var city=document.getElementById("DropDownList1"); AjaxMethod.GetCityList(city.value,get_city_Result_CallBack); }
function get_city_Result_CallBack(response) { if (response.value != null) { //debugger; document.all("DropDownList2").length=0; var ds = response.value; if(ds != null typeof(ds) == "object" ds.Tables != null) { for(var i=0; ids.Tables[0].Rows.length; i++) { var name=ds.Tables[0].Rows[i].city; var id=ds.Tables[0].Rows[i].cityID; document.all("DropDownList2").options.add(new Option(name,id)); } } } return } //市區(qū)---------------------------------------- function areaResult() { var area=document.getElementById("DropDownList2"); AjaxMethod.GetAreaList(area.value,get_area_Result_CallBack); } function get_area_Result_CallBack(response) { if (response.value != null) { document.all("DropDownList3").length=0; var ds = response.value; if(ds != null typeof(ds) == "object" ds.Tables != null) { for(var i=0; ids.Tables[0].Rows.length; i++) { var name=ds.Tables[0].Rows[i].area; var id=ds.Tables[0].Rows[i].areaID; document.all("DropDownList3").options.add(new Option(name,id)); } } } return } function getData() { var province=document.getElementById("DropDownList1"); var pindex = province.selectedIndex; var pValue = province.options[pindex].value; var pText = province.options[pindex].text;
var city=document.getElementById("DropDownList2"); var cindex = city.selectedIndex; var cValue = city.options[cindex].value; var cText = city.options[cindex].text;
var area=document.getElementById("DropDownList3"); var aindex = area.selectedIndex; var aValue = area.options[aindex].value; var aText = area.options[aindex].text;
var txt=document.getElementById("TextBox1");
document.getElementById("%=TextBox1.ClientID%>").innerText="省:"+pValue+"|"+pText+"市:"+cValue+"|"+cText+"區(qū):"+aValue+"|"+aText; } /SCRIPT> /HEAD> body ms_positioning="GridLayout"> form id="Form1" method="post" runat="server"> TABLE id="Table1" style="Z-INDEX: 101; LEFT: 96px; POSITION: absolute; TOP: 32px" cellSpacing="1" cellPadding="1" width="300" border="1" bgColor="#ccff66"> TR> TD>省市/TD> TD>asp:dropdownlist id="DropDownList1" runat="server">/asp:dropdownlist>/TD> /TR> TR> TD>城市/TD> TD>asp:dropdownlist id="DropDownList2" runat="server">/asp:dropdownlist>/TD> /TR> TR> TD>市區(qū)/TD> TD>asp:dropdownlist id="DropDownList3" runat="server">/asp:dropdownlist>/TD> /TR> /TABLE> asp:TextBox id="TextBox1" style="Z-INDEX: 102; LEFT: 416px; POSITION: absolute; TOP: 48px" runat="server" Width="424px">/asp:TextBox>INPUT style="Z-INDEX: 103; LEFT: 456px; WIDTH: 56px; POSITION: absolute; TOP: 96px; HEIGHT: 24px" type="button" value="test" onclick="getData();"> /form> /body> /HTML>2.cs代碼 using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace AjaxTest { /**//// summary> /// Summary description for WebForm1. /// /summary> public class WebForm1 : System.Web.UI.Page { protected System.Web.UI.WebControls.DropDownList DropDownList1; protected System.Web.UI.WebControls.DropDownList DropDownList2; protected System.Web.UI.WebControls.TextBox TextBox1; protected System.Web.UI.WebControls.DropDownList DropDownList3;
Web Form Designer generated code#region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); }
/**//// summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// /summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load);
} #endregion } }3.AjaxMethod using System; using System.Data; using System.Data.SqlClient; namespace AjaxTest { /**//// summary> /// Summary description for AjaxMethod. /// /summary> public class AjaxMethod { GetProvinceList#region GetProvinceList public static DataSet GetProvinceList() { string sql="select * from province"; return GetDataSet(sql); } #endregion
GetCityList#region GetCityList [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)] public DataSet GetCityList(int provinceid) { string sql="select * from city where father="+provinceid; return GetDataSet(sql); } #endregion
GetAreaList#region GetAreaList [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)] public DataSet GetAreaList(int cityid) { string sql="select * from area where father="+cityid; return GetDataSet(sql); } #endregion