如何实现无刷新的DropdownList联动效果

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huanglenzhi
推荐于2016-02-01 · 知道合伙人数码行家
huanglenzhi
知道合伙人数码行家
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长期从事计算机组装,维护,网络组建及管理。对计算机硬件、操作系统安装、典型网络设备具有详细认知。

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  1.引用ajax.dll

  2.Web.config

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

  3.创建类ajaxMethod.cs,代码如下:

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Data.SqlClient;
  using System.Data;

  namespace WebApplication1
  {
  public class ajaxMethod
  {

  #region GetPovinceList
  public static DataSet GetPovinceList()
  {
  string sql = "select * from province";
  return GetDataSet(sql);
  }
  #endregion

  #region GetCityList
  [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
  public DataSet GetCityList(int povinceid)
  {
  string sql = "select * from city where proID='" + povinceid + "'";
  return GetDataSet(sql);
  }
  #endregion

  #region GetDataSet
  public static DataSet GetDataSet(string sql)
  {
  SqlConnection ConnectionString = new SqlConnection("Data Source=.;database=Area;Integrated Security=True");
  SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);
  DataSet ds = new DataSet();
  sda.Fill(ds);
  return ds;
  }
  #endregion

  }
  }

  

  4.创建主页面Sample.aspx

  前台:

  <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Sample.aspx.cs" Inherits="WebApplication1.Sample" %>

  <!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>
  <title>实现DropDownList无刷新联动</title>
  </head>
  <body>
  <script language="javascript" type="text/javascript">
  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) {
  document.all("DropDownList2").length = 0;
  var ds = response.value;
  document.all("DropDownList2").options.add(new Option("--请选择--", -1));
  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].cityName;
  var id = ds.Tables[0].Rows[i].cityID;
  document.all("DropDownList2").options.add(new Option(name, id));
  }
  }
  }
  return
  }
  </script>
  <form id="form1" runat="server" method="post">
  省份:<asp:DropDownList ID="DropDownList1" runat="server" Width="100px">
  </asp:DropDownList><br />
  城市:<asp:DropDownList ID="DropDownList2" runat="server" Width="100px">
  </asp:DropDownList>
  </form>
  </body>

  </html>

  

  后台:

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Data.SqlClient;
  using System.Data.Odbc;
  using System.Data;

  namespace WebApplication1
  {
  public partial class Sample : System.Web.UI.Page
  {
  protected void Page_Load(object sender, EventArgs e)
  {
  Ajax.Utility.RegisterTypeForAjax(typeof(ajaxMethod));
  if (!Page.IsPostBack)
  {
  this.DropDownList1.DataSource = ajaxMethod.GetPovinceList();
  this.DropDownList1.DataTextField = "proName";
  this.DropDownList1.DataValueField = "proID";
  this.DropDownList1.DataBind();

  DropDownList1.Items.Insert(0, new ListItem("--请选择--"));
  DropDownList2.Items.Insert(0, new ListItem("--请选择--"));
  
  this.DropDownList1.Attributes.Add("onclick", "cityResult();");
  }
  }
  }
  }
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