Ajax聯動下拉框的實現例子

最後更新：2018-12-07 來源：互聯網

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Ajax聯動下拉框的實現例子這是採用Ajax技術,重新整理是肯定的,是在我們察覺不到的速度完成.XMLHTTP犧牲頁面的方法,我們之所以看不見重新整理,是因為所有的工作都是在犧牲頁面上進行的,裡面"翻江倒海"的"折騰",我們看不見,效率上差些!
字串8

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

字串6

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> 字串7

AjaxTest.aspx 字串3

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

字串3

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

字串4

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>無標題頁</title> 字串5

</head> 字串1

<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
} 字串1

</script>
<form id="form1" runat="server">
        
<asp:DropDownList ID="DropDownList1" runat="server">
        </asp:DropDownList>
        <asp:DropDownList ID="DropDownList2" runat="server">
        </asp:DropDownList> 
      <br />
    </form>
</body>
</html>

字串7

AjaxTest.cs

字串3

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();

字串7

       }
    }
    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();

字串4

              this.DropDownList1.Attributes.Add("onclick", "areaResult();");
          }
          catch (Exception ex)
          {
              Response.Write(ex.Message);
          }
    } 字串6

    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;
    } 字串9

    [AjaxPro.AjaxMethod]
    public DataSet GetCityList(int id)
    {
        string sql = "select name from test where id='" + id + "'";
        return GetDataSet(sql,"test");
    }

字串4

} 字串1

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