Ajax联动下拉框的实现例子_Ajax编程_黑客防线网安服务器维护基地--Powered by WWW.RONGSEN.COM.CN

Ajax联动下拉框的实现例子

作者:黑客防线网安Ajax教程基地 来源:黑客防线网安Ajax教程基地 浏览次数:0

本篇关键词:例子实现 using
黑客防线网安网讯:  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...

  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=localhostPMSERVER;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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