Ajax联动下拉框的实现例子

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

这是采用ajax技术,刷新是肯定的,是在我们察觉不到的速度完成.XMLHTTP牺牲页面的方法,我们之所以看不见刷新,是因为所有的工作都是在牺牲页面上进行的,里面"翻江倒海"的"折腾",我们看不见,效率上差些!

AjaxPro.dll 下载地址 http://ajaxpro.schwarz-interactive.de/download/ajaxpro.zip

Web.Config

<?xml version="1.0"?>

<configuration>

<system.web>

<httpHandlers>

<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />

<add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory,AjaxPro.2"/>

</httpHandlers>

</system.web>

</configuration>

AjaxTest.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxTest.aspx.cs" Inherits="AjaxTest" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

<title>无标题页</title>

</head>

<body>

<script language="javascript" type="text/javascript">

function areaResult()

{

var area=document.getElementById("DropDownList1");

//alert(area.value);

AjaxTest.GetCityList(area.value,get_city_Result_CallBack);

}

function get_city_Result_CallBack(response)

{

if (response.value != null)

{

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].name;

var id=ds.Tables[0].Rows[i].id;

document.all("DropDownList2").options.add(new Option(name,id));

}

//document.all("TextBox1").value="";

}

}

return

}

</script>

<form id="form1" runat="server">

&nbsp;&nbsp;

<asp:DropDownList ID="DropDownList1" runat="server">

</asp:DropDownList>

<asp:DropDownList ID="DropDownList2" runat="server">

</asp:DropDownList>&nbsp;

<br />

</form>

</body>

</html>

AjaxTest.cs

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 MeetWeb;

public partial class AjaxTest : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

AjaxPro.Utility.RegisterTypeForAjax(typeof(AjaxTest));

if (!Page.IsPostBack)

{

BindData();

}

}

private void BindData()

{

DataSet ds = new DataSet();

String sql = "Select id,name from test";

try

{

ds = GetDataSet(sql, "test");

this.DropDownList1.DataSource = ds.Tables[0];

this.DropDownList1.DataTextField = "name";

this.DropDownList1.DataValueField = "id";

this.DropDownList1.DataBind();

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

}

catch (Exception ex)

{

Response.Write(ex.Message);

}

}

public static DataSet GetDataSet(string sql,string aa)

{

MeetWeb.SqlDataBase a = new MeetWeb.SqlDataBase("server=localhost\\PMSERVER;uid=sa;pwd=sa;database=test");

DataSet ds = new DataSet();

ds=a.CreateSet(sql, aa);

return ds;

}

[AjaxPro.AjaxMethod]

public DataSet GetCityList(int id)

{

string sql = "select name from test where id='" + id + "'";

return GetDataSet(sql,"test");

}

}

 
 
 
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