在一个在线客服系统中，使用了Ajax技术实现无刷新的信息更新。下面这个例子是定时清理不在线的客户
首先在load事件中注册private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 Ajax.Utility.RegisterTypeForAjax(typeof(Project.www.SC.GuestTalk)); //这里注册了类名 }
//===========服务器事件，由网页客户端发送请求============
/// <summary> /// 清理活动时间过20分钟的用户 /// </summary> /// <returns></returns>
[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.ReadWrite)]
public string ClearGuest() { DakingConfig dakingConfig = Config.GetSettings(); foreach(DataRow drGuest in Global.DtGuestList.Rows) { TimeSpan ts = System.DateTime.Now - Convert.ToDateTime(drGuest["ActiveTime"]); if(ts.Minutes>= Convert.ToInt32(dakingConfig.TimeOut)) { Global.DtGuestList.Rows.Remove(drGuest); DataRow[] drGuestTalks = Global.DtChatList.Select("GuestId=" + drGuest["GuestId"].ToString()); foreach(DataRow drTalk in drGuestTalks) { Global.DtChatList.Rows.Remove(drTalk); } } } return "true"; }
//================网页客户端请求代码=================
<script language="javascript" type="text/javascript"> var talks = document.getElementById("Talks"); function MyShow() { //2秒自动刷新一次,2秒取得一次数据. timer = window.setInterval('Pop()',RefreshTime); } function Pop() { talks.innerHTML = GuestTalk.GetTalks().value; GuestTalk.ClearGuest(); } </script> <script language="javascript"> var talks = document.getElementById("Talks");
//Talks是网页上的标签，用于显示该请求返回的字符串 function Pop() { talks.innerHTML = GuestTalk.GetTalks().value; GuestTalk.ClearGuest(); }
//20秒自动刷新一次,20秒取得一次数据. timer = window.setInterval('Pop()',20000); </script>
