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原帖地址：http://www.cnblogs.com/fifastar/archive/2008/06/02/1212225.html
测试代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Test.aspx.cs" Inherits="AjaxCtpWebDemo.Test" %>
<!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>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<%=DateTime.Now.ToString() %><hr/>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<%=DateTime.Now.ToString() %>
<hr/>
<asp:Button ID="Button1" runat="server" Text="Button" />
</ContentTemplate>
</asp:UpdatePanel>
<script type="text/javascript" language="javascript">
Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(
function(sender,e)
{
alert("add_initializeRequest");
}
);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(
function(sender,e){
alert("add_endRequest");
}
);
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(
function(sender,e){
alert("add_beginRequest");
}
);
Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(
function(sender,e){
alert("add_pageLoaded");
}
);
Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(
function(sender,e){
alert("add_pageLoading");
}
);
</script>
</form>
</body>
</html>
最终结果如下:
1.页面第一次进入时，会首先激发add_pageLoaded事件
2.异步提交时，事件的激发顺序如下:
add_initializeRequest
add_beginRequest
add_pageLoading
add_pageLoaded
add_endRequest
add_pageLoaded （编辑：李大同）
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