javascript 在会话到期前提醒用户，可以选择续订会话
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Alert user before session expires, option to renew session
提问by Brian Mains
I am setting session time in web config. I also have a javascript for detecting session timeout and letting the user know.
我正在网络配置中设置会话时间。我还有一个用于检测会话超时并让用户知道的 javascript。
I would like to be able to alert the user 30 sec or a min or more before session timeout with a popup and to give them the opportunity to extend it or cancel and just let it timeout. Can this be done? I have tried to use various methods on the internet but none seem to work. They all require that I download something and I don't want to have to do that.
我希望能够在会话超时前 30 秒或一分钟或更长时间通过弹出窗口提醒用户，并让他们有机会延长或取消并让它超时。这能做到吗？我曾尝试在互联网上使用各种方法，但似乎都不起作用。他们都要求我下载一些东西，我不想这样做。
<script type="text/javascript">
var sessionTimeout = "<%= Session.Timeout %>";
function DisplaySessionTimeout() {
sessionTimeout = sessionTimeout - 1;
if (sessionTimeout >= 0)
window.setTimeout("DisplaySessionTimeout()", 60000);
else
alert("Your current Session is over due to inactivity.");
}
</script>
I am also checking for timeout in code behind and rediecting but thinking about just doing it in javascript.
我也在检查代码背后的超时和重定向，但考虑只是在 javascript 中执行它。
protected void Page_Init(object sender, EventArgs e)
{
CheckSession();
}
private void CheckSession()
{
if (Session["ASP.NET_SessionId"] == null)
{
// Session.RemoveAll();
Response.Redirect("Home.aspx");
}
}
回答by Brian Mains
You have to essentialy have a timer at the same time limit as session; there is no way for the client to know exactly the time the session is at before expiring. That' what I've done in an application.
您必须在与会话相同的时间限制内设置一个计时器；客户端无法确切知道会话到期前的时间。这就是我在应用程序中所做的。
We do a JQuery $.get("keepalive.aspx")to make a request to an ASP.NET page, which accesses session and refreshes it, keeping the current session alive. You'd also then reset your client-side timer. This has worked well for us.
我们使用 JQuery$.get("keepalive.aspx")向 ASP.NET 页面发出请求，该页面访问会话并刷新它，保持当前会话处于活动状态。然后，您还需要重置客户端计时器。这对我们来说效果很好。
See this postfor more information.
有关更多信息，请参阅此帖子。
