ASP.NET - 基于 web.config 中 sessionState 超时的 Javascript 超时警告

Question

问题：我希望根据我的 webconfig sessionState TimeOut 属性在一个带有 c# 代码的 asp.net 页面上创建一个超时警告消息。

web.config 上的代码：

<configuration>
    <system.web>
        <sessionState timeout="20"></sessionState>
    </system.web>
</configuration>
<system.serviceModel>
    <bindings>
        <basicHttpBinding>
            <binding name="EchoSignDocumentService10HttpBinding" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="6553600" maxBufferPoolSize="524288" maxReceivedMessageSize="6553600" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
                <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="1638400" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                <security mode="Transport">
                    <transport clientCredentialType="None" proxyCredentialType="None" realm="" />
                    <message clientCredentialType="UserName" algorithmSuite="Default" />
                </security>
            </binding>
            <binding name="EchoSignDocumentService10HttpBinding1" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
                <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                <security mode="None">
                    <transport clientCredentialType="None" proxyCredentialType="None" realm="" />
                    <message clientCredentialType="UserName" algorithmSuite="Default" />
                </security>
            </binding>
        </basicHttpBinding>
    </bindings>
</system.serviceModel>

Answer 1

伪代码：

• 读取代码隐藏中的超时设置
• 注册一个ClientScriptblock（setTimeout超过超时时间（20 * 60））
• 超时时，在页面上显示警告标签

示例代码：

    public void RegisterTimeoutWarning(System.Web.UI.Page Page)
    {
        var timeout = HttpContext.Current.Session.Timeout * 60 * 1000;
        Page.ClientScript.RegisterStartupScript(Page.GetType(), 
                "timeoutWarning", 
                string.Format("setTimeout(function () {{ alert('Session about to expire'); }}, {0});", timeout), true);
    }

当然，您可以通过显示警告弹出窗口甚至是确认弹出窗口来改进客户端显示（而不是显示警报），然后您可以使用它来更新会话。

Answer 2

我之前通过在我的代码隐藏文件中创建一个用于检查超时的 Web 方法来完成此操作。让您的 Javascript 函数通过 AJAX 获取超时信息并显示相应的警告。

示例

这是我的代码隐藏中的网络方法：

[WebMethod]
public static bool HasSessionTimedOut()
{
    HttpSessionState session = HttpContext.Current.Session;

    // I put this value into Session at the beginning.
    DateTime? sessionStart = session[SessionKeys.SessionStart] as DateTime?;

    bool isTimeout = false;

    if (!sessionStart.HasValue)
    {
        isTimeout = true;
    }
    else
    {
        TimeSpan elapsed = DateTime.Now - sessionStart.Value;
        isTimeout = elapsed.TotalMinutes > session.Timeout;
    }

    return isTimeout;
}

这是我的 Javascript：

<script type="text/javascript">                                   
    $(function() {                                                 
        var callback = function(isTimeout) {
            if (isTimeout) {                           
                // Show your pop-up here...
            }                         
        };                                                         
        setInterval(                                                
            function() {
                // Don't forget to set EnablePageMethods="true" on your ScriptManager.
                PageMethods.HasSessionTimedOut(false, callback);    
            },                                                     
            30000                                                   
        );                                                          
    });                                                            
</script> 

所以，这是相当初级的。每 30 秒，我的 Javascript 函数使用 ASP.NET 的 PageMethods 对象向我的 Web 方法发送一个 AJAX 请求。它在回调中检查返回值是否为 true，这表明发生了超时，并采取适当的措施。

Answer 3

我无法让 FishbasketGordo 的代码工作，因为 Web 方法调用一直将布尔值“false”作为 onsuccess 方法传递。经过大量研究，我做了以下更改。

            $(function () {
                var isTimeout = false;
                var callback = function (isTimeout) {
                    if (isTimeout) {
                        // Show your pop-up here...
                        alert("You have timed out");
                    }
                };

                var failure = function () {
                    alert("Problem with Server");
                };

                setInterval(
                        function () {
                            // Don't forget to set EnablePageMethods="true" on your ScriptManager.
                            PageMethods.HasSessionTimedOut(callback,failure);
                        }, 30000
                );
            });

Answer 4

试试这个解决方案（需要脚本管理器）：

<script type="text/javascript">

    //get a hold of the timers
    var iddleTimeoutWarning = null;
    var iddleTimeout = null;

    //this function will automatically be called by ASP.NET AJAX when page is loaded and partial postbacks complete
    function pageLoad() {

        //clear out any old timers from previous postbacks
        if (iddleTimeoutWarning != null)
            clearTimeout(iddleTimeoutWarning);
        if (iddleTimeout != null)
            clearTimeout(iddleTimeout);
        //read time from web.config
        var millisecTimeOutWarning = <%= int.Parse(System.Configuration.ConfigurationManager.AppSettings["SessionTimeoutWarning"]) * 60 * 1000 %>;
        var millisecTimeOut = <%= int.Parse(System.Configuration.ConfigurationManager.AppSettings["SessionTimeout"]) * 60 * 1000 %>;

        //set a timeout to display warning if user has been inactive
        iddleTimeoutWarning = setTimeout("DisplayIddleWarning()", millisecTimeOutWarning);
        iddleTimeout = setTimeout("TimeoutPage()", millisecTimeOut);
    }

    function DisplayIddleWarning() {
        alert("Your session is about to expire due to inactivity.");
    }

    function TimeoutPage() {
        //refresh page for this sample, we could redirect to another page that has code to clear out session variables
        location.reload();
    }

</script>

Answer 5

在我的博客中试试这个Seesion Alert Using Jquery：

• 会话设置为超时（例如 30 分钟）。
• 当会话超时时，用户退出。
• 显示倒计时，以便用户知道还剩多长时间。
• 在用户接近限制时通知用户（例如，还剩 5 分钟）。
• 让用户知道他们由于不活动而自动超时。

Answer 6

我在我的 asp.net edit.aspx 页面上使用以下 javascript 代码创建了一个超时警告消息，要求用户在会话超时前保存数据 x 剩余分钟数：

<script language="javascript" type="text/javascript">
    var sessionTimeoutWarning = "<%= System.Configuration.ConfigurationSettings.AppSettings["SessionWarning"].ToString()%>";
    var sessionTimeout = "<%= Session.Timeout %>";

    var sTimeout = parseInt(sessionTimeoutWarning) * 60 * 1000;
    setTimeout('SessionWarning()', sTimeout);

    function SessionWarning() 
    {
        var message = "Your session will expire in another " + (parseInt(sessionTimeout) - parseInt(sessionTimeoutWarning)) + " mins! Please Update the data before the session expires";
        alert(message);
    }
</script>

我将警告消息的频率设置为每 20 分钟一次，并通过将其作为变量放在应用程序设置下轻松更改，这也可以在 web.config 下访问并定义为键 (SessionWarning) w/ 值为 20（表示 20 分钟）。

这是我在 web.config 文件中使用的代码：

<configuration>
    <appSettings>
        <add key="SessionWarning" value="20" />
        <add key="EchoSignApiKey" value="XZKZ3VT2M*****" />
        <add key="EchoSignSignedDocumentUrl" value="http://echosign:*****.Com/ApplicationFiles/" />
        <!-- dummy -->
        <add key="ImageSaveFolder" value="C:\Development\Temp" />
        <add key="FileSaveFolder" value="C:\Development\Temp" />
        <!-- Test Library-->
        <add key="AS400LIBRARY" value="TPATSTDTA" />
        <add key="AllowVoiceSignature" value="False" />
    </appSettings>
    <system.web>
        <sessionState timeout="60" />
    </system.web>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="EchoSignDocumentService10HttpBinding" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="6553600" maxBufferPoolSize="524288" maxReceivedMessageSize="6553600" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="1638400" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <security mode="Transport">
                        <transport clientCredentialType="None" proxyCredentialType="None" realm="" />
                        <message clientCredentialType="UserName" algorithmSuite="Default" />
                    </security>
                </binding>
                <binding name="EchoSignDocumentService10HttpBinding1" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true">
                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
                    <security mode="None">
                        <transport clientCredentialType="None" proxyCredentialType="None" realm="" />
                        <message clientCredentialType="UserName" algorithmSuite="Default" />
                    </security>
                </binding>
            </basicHttpBinding>
        </bindings>
    </system.serviceModel>
</configuration>