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Ajax实现无刷新三联动下拉框

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Ajax使用初步，实现步骤
1.把Ajax.dll copy到应用系统bin目录下，然后在工程引用中引用Ajax.dll，如果没有的话可以下载Ajax.dll
2.配置web.config，添加如下信息

</httpHandlers>
3.假设应用系统叫Document，目录格式为Pages\AjaxTest

//[Ajax.AjaxMethod]

[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]

public static string GetNIVNumber(string str)

{

return str;

}
4.在Pages\AjaxTest下建立页面WebForm1.aspx
5.html代码

<HTML>

<HEAD>

<title>Ajax实现无刷新三联动下拉框</title>

//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; i<ds.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

}

//市区----------------------------------------

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; i<ds.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+"区:"+aValue+"|"+aText;

}

</SCRIPT>

</HEAD>

<TABLE id="Table1" style="Z-INDEX: 101; LEFT: 96px; POSITION: absolute; TOP: 32px" cellSpacing="1"

cellPadding="1" width="300" border="1" bgColor="#ccff66">

<TR>

</TR>

<TR>

</TR>

<TR>

</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>
6. cs代码

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;

private void Page_Load(object sender, System.EventArgs e)

{ //注册,AjaxMethod.cs方法所在的命名空间

Ajax.Utility.RegisterTypeForAjax(typeof(AjaxMethod));

if(!Page.IsPostBack)

{

this.DropDownList1.DataSource=AjaxMethod.GetPovinceList();

this.DropDownList1.DataTextField="province";

this.DropDownList1.DataValueField="provinceID";

this.DropDownList1.DataBind();

this.DropDownList1.Attributes.Add("onclick","cityResult();");

this.DropDownList2.Attributes.Add("onclick","areaResult();");

}

Web Form Designer generated codeWeb 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

}
7.在Pages\AjaxTest下建立cs文件AjaxMethod.cs(业务逻辑类)，添加如下方法

using System;

using System.Data;

using System.Data.SqlClient;

namespace AjaxTest

{

/**//**//**//// <summary>

/// Summary description for AjaxMethod.

/// </summary>

public class AjaxMethod

{

GetPovinceListGetPovinceList#region GetPovinceList

public static DataSet GetPovinceList()

{

string sql="select * from povince";

return GetDataSet(sql);

}

#endregion

GetCityListGetCityList#region GetCityList

[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]

public DataSet GetCityList(int povinceid)

{

string sql="select * from city where father='"+povinceid+"'";

return GetDataSet(sql);

}

#endregion

GetAreaListGetAreaList#region GetAreaList

[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]

public DataSet GetAreaList(int cityid)

{

string sql="select * from area where father='"+cityid+"'";

return GetDataSet(sql);

}

#endregion

GetDataSetGetDataSet#region GetDataSet

public static DataSet GetDataSet(string sql)

{

string ConnectionString=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

SqlDataAdapter sda =new SqlDataAdapter(sql,ConnectionString);

DataSet ds=new DataSet();

sda.Fill(ds);

return ds;

}

#endregion

}

}
8. Ajax实现无刷新三级连动完整源代码(附数据库)

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