Ajax实现无刷新三联动下拉框

最新推荐文章于 2009-12-28 15:14:00 发布

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#ajax #callback #textbox #server #javascript #generator

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本文介绍了一个使用Ajax实现的无刷新三联动下拉框功能，详细展示了HTML、JavaScript及C#代码，用于动态加载省份、城市及区域选项。

1.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>

2.cs代码

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;

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

{

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

if(!Page.IsPostBack)

{

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

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 code

}

3.AjaxMethod

using System;

using System.Data;

using System.Data.SqlClient;

namespace AjaxTest

{

/// <summary>

/// Summary description for AjaxMethod.

/// </summary>

public class AjaxMethod

{

GetProvinceList

GetCityList

GetAreaList

GetDataSet

}

4.web.config

</httpHandlers>