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This article introduces how ASP.NET closes the page server and empties the dialogue layer. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

To clear the Session, you must go back to the server, where the content of the server cannot be changed. ASP.NET closes the emptying of the conversation layer on the server side of the page. We can modify it by using ajax. First of all, we need to determine when the user closes the page so that we can perform the next action. However, HTML DOM does not want page closure events, only onunload and onbeforeunload are related to ASP.NET closing pages, ASP.NET closes pages or refreshes events, onbeforeunload is events before ASP.NET closes pages or refreshes pages, so we want to use onbeforeunload. To determine whether the user is closing the page or refreshing the page. The code is as follows:

_ window.onbeforeunload = function () {/ / this is found on the Internet, but has not been verified

Var n = window.event.screenX-window.screenLeft

Var b = n > document.documentElement.scrollWidth-20

If (b & & window.event.clientY

< 0 || window.event.altKey) { ClearSession(); } } ClearSession()为ajax调用请求服务端，服务端接收到请求后执行清空Session的操作。Ajax的东西不多说了，下面为代码。 ========================Default.aspx 开始=========================================== 无标题页 ========================Default.aspx 结束=========================================== ========================Default.aspx.cs 开始=========================================== using System; using System.Data; using System.Configuration; 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 _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!string.IsNullOrEmpty(Request.QueryString["___command"])) { string cmd = Request.QueryString["___command"]; if (cmd == "ClearSession") Session.Remove("name");//清空Session } if (Session["name"] != null) this.Label1.Text = Session["name"].ToString(); } protected void Button1_Click(object sender, EventArgs e) { Session["name"] = "vvvvvvvvvvvvv"; if (Session["name"] != null) this.Label1.Text = Session["name"].ToString(); } } ========================Default.aspx.cs 结束=========================================== ========================script.js 开始=========================================== function GetXmlHttpObject() { //创建XMLHttpRequest对象来发送和接收HTTP请求与响应 xmlHttpObj = null; try { // FireFox Opera 8.0+ Safari xmlHttpObj = new XMLHttpRequest(); if(xmlHttpObj.overrideMimeType) { xmlHttpObj.overrideMimeType('text/xml'); } } catch(e) { // IE try { xmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) { xmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttpObj; } function StateChanged() { if(___xmlHttp.readyState == 4) { if(___xmlHttp.status == 200) { } else { } } } var ___xmlHttp=null; function ClearSession() { if(___xmlHttp==null) ___xmlHttp = GetXmlHttpObject(); if(___xmlHttp == null) return false; var url = "?___command=ClearSession&___clientRandom=" + Math.random(); ___xmlHttp.open("GET", url, true); ___xmlHttp.onreadystatechange = StateChanged; ___xmlHttp.send(null); } _window.onbeforeunload = function() { var n = window.event.screenX - window.screenLeft; var b = n >

Document.documentElement.scrollWidth-20; if (b & window.event.clientY < 0 | | window.event.altKey) {ClearSession ();}}

So much for sharing about how ASP.NET closes the page server and empties the dialogue layer. I hope the above content can be of some help to you and learn more. If you think the article is good, you can share it for more people to see.

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