Asp.Net2.0无刷新客户端回调
2008-03-07 15:00
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实现Asp.Net2.0的客户端回调功能
一 环境
Asp.net 2.0
VS 2005
二 客户端
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ajaxnet.aspx.cs" Inherits="ajaxnet" %>
<!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>Server Time</title>
<script type="text/javascript" language="javascript">
function GetServerTime()
{
var message = '';
var context = '';
<%=sCallBackFunctionInvocation%>
}
function ShowServerTime(timeMessage, context) {
var a = document.getElementById("loadinfo");
a.innerHTML = timeMessage;
}
</script>
</head>
<body>
<form id="MainForm" runat="server">
<input id="button1" type="button" value="得到服务器端时间" onclick="GetServerTime();" />
</form>
<div id="loadinfo"></div>
</body>
</html>
三 后端代码:
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;
public partial class ajaxnet : System.Web.UI.Page,ICallbackEventHandler
...{
public string sCallBackFunctionInvocation;
void Page_Load(object sender, System.EventArgs e)
...{
sCallBackFunctionInvocation = Page.ClientScript.GetCallbackEventReference(this, "message", "ShowServerTime", "context");
}
public void RaiseCallbackEvent(string eventArgument)
...{
}
public string GetCallbackResult()
...{
System.Threading.Thread.Sleep(2000);
return DateTime.Now.ToString();
}
}
必须继承ICallbackEventHandler接口,实现GetCallbackResult()
方法来返回值。
GetCallbackEventReference:获取一个对客户端函数的引用;调用该函数时,将启动一个对服务器端事件的客户端回调。此重载方法的客户端函数包含指定的控件、参数、客户端脚本和上下文。
一 环境
Asp.net 2.0
VS 2005
二 客户端
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ajaxnet.aspx.cs" Inherits="ajaxnet" %>
<!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>Server Time</title>
<script type="text/javascript" language="javascript">
function GetServerTime()
{
var message = '';
var context = '';
<%=sCallBackFunctionInvocation%>
}
function ShowServerTime(timeMessage, context) {
var a = document.getElementById("loadinfo");
a.innerHTML = timeMessage;
}
</script>
</head>
<body>
<form id="MainForm" runat="server">
<input id="button1" type="button" value="得到服务器端时间" onclick="GetServerTime();" />
</form>
<div id="loadinfo"></div>
</body>
</html>
三 后端代码:
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;
public partial class ajaxnet : System.Web.UI.Page,ICallbackEventHandler
...{
public string sCallBackFunctionInvocation;
void Page_Load(object sender, System.EventArgs e)
...{
sCallBackFunctionInvocation = Page.ClientScript.GetCallbackEventReference(this, "message", "ShowServerTime", "context");
}
public void RaiseCallbackEvent(string eventArgument)
...{
}
public string GetCallbackResult()
...{
System.Threading.Thread.Sleep(2000);
return DateTime.Now.ToString();
}
}
必须继承ICallbackEventHandler接口,实现GetCallbackResult()
方法来返回值。
GetCallbackEventReference:获取一个对客户端函数的引用;调用该函数时,将启动一个对服务器端事件的客户端回调。此重载方法的客户端函数包含指定的控件、参数、客户端脚本和上下文。
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