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| Author | Forum: PowerWEB LiveControls for ASP.NET Topic: Timer Control behavior |
| indecorum From: Knoxville, TN USA Posts: 13 Member Since: 04/27/06 |
posted February 9, 2007 12:08 PM Since we've started using the LiveTimer control through several updates, we've experienced some flakey client behavior. We can't get any details, these reports come in from end users in the field who have no reason to give us honest feedback about what they were doing or what really happened. But it has happened enough that we are concerned. The application uses a timer to countdown and then redirect the user to a timeout page. Once they visit a single page, they can't get back to it. What appears to be happening is the timeout code gets fired immediately, like the timer initializes and counts down all at once. We've never been able to duplicate this, but get reports on it happening almost weekly. Does anybody have any thoughts on how I could resolve or debug this? Thanks! |
John Talarico From: Rome, NY USA Posts: 630 Member Since: 06/01/05 |
posted February 9, 2007 1:45 PM Which version of LiveControls are you using? Are your users working with any specific browser and version, or is it mixed? Also, howare the redirects performed? Do you use a Response.Redirect or Server.Transfer within a callback? |
| indecorum From: Knoxville, TN USA Posts: 13 Member Since: 04/27/06 |
posted February 9, 2007 2:39 PM We have many different clients including home users, people in hotels, people on corporate networks, etc. It is hard to control the client, including browser. So just about anything goes. Do to the nature of the app, it is easier for the user (and more advantageous!) to blame us than to admit to problems locally, so it is very hard to get specifics. If my code is bad, it'd be hard to know. Heh... Anyway, we are currently on v1.1.4322, but this has been ongoing for the two or so years and through all the versions we've been using the product. I'll post relevant code to show the whole process. If something is wrong with the code, that would be great! If you need clarification, let me know. A start/end time is set, the timer is started, and if the end time is hit the timer is supposed to redirect. It uses BufferedScript for the redirect, which was suggested in response to a previous post on the forum here. We have to use a long interval because using a 1 second interval makes the page hang and causes users to complain. Public iTimeoutSeconds As Integer Protected WithEvents LiveTimer1 As Dart.PowerWEB.LiveControls.LiveTimer Private bStopTest As Boolean = False Protected Overrides Sub OnLoad(ByVal e As System.EventArgs) If Not IsPostBack Then LoadSection() If iTimeoutSeconds > 0 And Not bStopTest Then If Not (IsDate(Session("EndTime"))) Then Session("EndTime") = Now.Add(New TimeSpan(0, 0, iTimeoutSeconds)) Session("StartTime") = Now End If LiveTimer1.Blocking = True LiveTimer1.Interval = ConfigurationSettings.AppSettings("TimedTestTimerInterval") LiveTimer1.Start() End If End If MyBase.OnLoad(e) End Sub Private Sub LoadSection() Dim oSec As New Section oSec.LoadSection() iTimeoutSeconds = oSec.Seconds End Sub Private Sub LiveTimer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles LiveTimer1.Tick ' Stop the timer. The timer will only be restarted if the Auction is not over LiveTimer1.Stop() ' Determine how much time is remaining If Not IsDate(Session("EndTime")) Then Exit Sub Dim TimeLeft As TimeSpan Try TimeLeft = New TimeSpan(CDate(Session("EndTime")).Ticks - Now.Ticks) Catch ex As Exception Exit Sub End Try If TimeLeft.Ticks > 0 Then ' Set the time left LiveLabel LiveTimer1.BufferedScript.Write("window.status='" + TimeLeft.Hours.ToString("D2") + ":" + TimeLeft.Minutes.ToString("D2") + ":" + TimeLeft.Seconds.ToString("D2") + "';") ' Restart the Timer LiveTimer1.Start() Else If RecordAnswers(True, False) Then bStopTest = True Session("EndTime") = "" LiveTimer1.BufferedScript.Write("window.location='" & ConfigurationSettings.AppSettings("CurrentSiteSSLURL") & "multi_section_timeout.aspx';") End If End If End Sub |
| John Talarico From: Rome, NY USA Posts: 630 Member Since: 06/01/05 |
posted February 9, 2007 3:27 PM I think the v1.1.4322 version is the .NET Framework (labeled Runtime Version), not the LiveControls version. If you're looking at the Reference properties in Visual Studio, it's the last field labeled Version. As for the code, I'm not sure what could be causing the problem but it appears that you're firing .Stop() on every Tick event, and then .Start() when you want to proceed. It's best to reverse that logic and only fire Stop() when necessary, assuming that the timer will continue. This could prevent erroneous stop/start commands from being sent back to the client. |
| indecorum From: Knoxville, TN USA Posts: 13 Member Since: 04/27/06 |
posted February 9, 2007 3:30 PM Woops...pasted from the wrong field. Our version is 1.5.4.0. I got that stop/start from one of your examples. Thought it was weird, but went with it. So I'll give that a try, since it makes good sense! Thanks. Any other ideas? |
| jtrevino From: Santa Monica, CA USA Posts: 10 Member Since: 06/05/06 |
posted February 9, 2007 7:10 PM Is there a conclusion to this post? |
| John Talarico From: Rome, NY USA Posts: 630 Member Since: 06/01/05 |
posted February 12, 2007 10:43 AM Adrian - let us know if this resolved the issue. We haven't found any other possible cause. |
| indecorum From: Knoxville, TN USA Posts: 13 Member Since: 04/27/06 |
posted February 12, 2007 10:51 AM I haven't published the update yet due to high volume of site usage. One published, it'll take awhile to know whether the update fixed it, but I'll post another message if it doesn't. |
| indecorum From: Knoxville, TN USA Posts: 13 Member Since: 04/27/06 |
posted March 5, 2007 10:21 PM The problem continues. When it occurs, we are seeing two behaviors: either the timer does not work at all (lets the user continue even after time has expired) or it generates an error. I still cannot get any specific information about what the users are doing or their hardware/browser/connection information. Can you think of anything client-side that would cause the timer (or its calls to the server) to fail? Can you think of anything I can do to test whether the timer will work before letting the user proceed into the timed area? Thanks! |
| John Talarico From: Rome, NY USA Posts: 630 Member Since: 06/01/05 |
posted March 7, 2007 9:12 AM Without having a way to reproduce the issue, it is difficult for us to determine what would be causing the Timer events to fail. The LiveTimer makes callbacks like other LiveControls and utilizes the standard JavaScript setTimeout() method to trigger callbacks from the client on the configured interval. |
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