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ASP.NET2.0中用ICallbackEventHandler实现客户端与服务器端异步交互

 2006-12-27 17:19:04 来源:WEB开发网   
核心提示:页面代码:<script type="text/javascript"> function ReceiveServerData(rValue) { alert(rValue); } </script><input id="Button1" ty

页面代码:
<script type="text/javascript">
    function ReceiveServerData(rValue)
    {
     alert(rValue);
    }
 </script>
<input id="Button1" type="button" value="button" onclick ="CallServer('Client')" />
服务端代码:
public partial class back2 : System.Web.UI.Page,System .Web .UI .ICallbackEventHandler
{
   public string CallBackValue = null;
   PRotected void Page_Load(object sender, EventArgs e)
   {

   }
   // 注册脚本到前台页面
   protected void Page_PreRender(object sender, EventArgs e)
   {
     RegClientScript();
   }
   // Javascript函数(服务器端事件的客户端回调)
   protected void RegClientScript()
   {
    ClientScriptManager cs = Page.ClientScript;
    string jstxt=@"
          function CallServer(msgid)
          {
           " + cs.GetCallbackEventReference(this, "msgid", "ReceiveServerData", null) + @";
          }";
    cs.RegisterStartupScript(this.GetType(), "callserver", jstxt, true);
   }
   //ICallbackEventHandler接口
   //把值传到前台
   string ICallbackEventHandler.GetCallbackResult()
   {
     return CallBackValue + ",Server";
   }

   //按受前台的参数
   void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
   {
     this.CallBackValue = eventArgument;
   }
}
http://www.cnblogs.com/chy710/archive/2006/12/26/604118.html

Tags:ASP NET 中用

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