<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PerformCallback.aspx.cs" Inherits="PerformCallback" %> <!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></title> <script language="javascript" type="text/javascript"> //客户端处理下拉框选择项改变事件,client端aspxcombox下拉框改变事件为SelectedIndexChanged function OnEmployeesChanged(s) { //PerformCallback事件实际上时dev系列控件客户端服务器端异步通信的"大使"，通过PerfromCallback事件 //将客户端的通信要求传递给服务端,在服务端通过控件的callback事件来接受相关参数并进行页面异步刷新 //向服务器发送数据 alert("向服务发送:" + s.GetValue()); devcbxChi.PerformCallback(s.GetValue()); } </script> <style type="text/css"> .style1 { 100%; } .style2 { 231px; } </style> </head> <body> <form id="form1" runat="server"> <div> <table class="style1"> <tr> <td class="style2"> 主动向服务器发起挑战</td> <td> <dx:ASPxComboBox runat="server" ID="devcbxPar2" EnableSynchronization="False" ClientInstanceName="devcbxPar2" Width="160px" IncrementalFilteringMode="StartsWith"> <ClientSideEvents SelectedIndexChanged="function(s, e) { OnEmployeesChanged(s); }"></ClientSideEvents> <Items> <dx:ListEditItem Text="数据0" Value="0" /> <dx:ListEditItem Text="数据1" Value="1" /> <dx:ListEditItem Text="数据2" Value="2" /> <dx:ListEditItem Text="数据3" Value="3" /> </Items> </dx:ASPxComboBox> </td> </tr> <tr> <td class="style2"> 向服务器发起挑战</td> <td> <dx:ASPxComboBox runat="server" ID="devcbxChi" DropDownStyle="DropDownList" EnableIncrementalFiltering="True" EnableSynchronization="False" ClientInstanceName="devcbxChi" Width="160px" oncallback="devcbxChi_Callback"> </dx:ASPxComboBox> </td> </tr> </table> <br /> </div> </form> </body> </html>
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class PerformCallback : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } //服务器接收挑战 protected void devcbxChi_Callback(object sender, DevExpress.Web.CallbackEventArgsBase e) { devcbxChi.Items.Add("这是来自客户端的数据:"+e.Parameter); devcbxChi.SelectedIndex = devcbxChi.Items.Count - 1; } }