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| Author | Forum: PowerWEB LiveControls for ASP.NET Topic: LiveTimer and LiveLabel Update |
| NaineshUK From: London, United Kingdom Posts: 3 Member Since: 07/13/06 |
posted July 27, 2006 7:40 AM Hi there guys I have come across an issue that i have not been able to solve I have a livetimer running on a page, and when the timer runs down to a certain point i execute a number of functions. At this point i have a loop that pauses the page for 10 seconds and also execute a number of functions. For some reason i cannot seem to update the livelabel that i have in the page. Here is the code Protected Sub LiveTimer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles LiveTimer1.Tick If TimeLeft.Ticks > 0 Then 'Keep the timer running Me.lblTimeValue.Text = "Time remaining is " & GetRemainingTime(EndTime).ToLongTimeString 'Start the timer LiveTimer1.Start() Else Me.lblTimeValue.Text = "We have run out of time" 'Now we want to show the current status for 10 seconds 'We need to loop for so many seconds till the time is up Dim TimeEnd As New TimeSpan(Date.Now.AddSeconds(10).Ticks) Do While Date.Now.Ticks < TimeEnd.Ticks 'keep looping Loop LiveTimer1.BufferedScript.Write("window.location='default.aspx';") End If End Sub What i require is that the livelabel update before we get into the 10s loop. Your help here would be much appreciated |
Jeff Cranford From: Rome, NY USA Posts: 586 Member Since: 05/30/01 |
posted July 28, 2006 12:47 PM That's not possible using Ajax techniques (at this time). In order to update a client-side element, you need a callback, then a response to the callback. What you are attempting to do is theoretically possible in the HTTP protocol (using something similar to the Response.Buffer/Response.Flush techniques from old ASP) but not supported at this time by any XmlHttp object (which is responsible for the HTTP communication to/from the browser) I would recommend you use a countdown animated gif (you could use a LiveImage...I found an example at http://www.geocities.com/SoHo/1085/countdown.gif ). Then modify your if-statement like so: If TimeLeft.Ticks > 0 Then 'Keep the timer running Me.lblTimeValue.Text = "Time remaining is " & GetRemainingTime(EndTime).ToLongTimeString 'Start the timer LiveTimer1.Start() Else Me.lblTimeValue.Text = "We have run out of time" ' Load countdown animated gif Me.LiveImage1.ImageUrl = "countdown.gif" LiveTimer1.BufferedScript.Write("window.location='default.aspx';") End If |
| NaineshUK From: London, United Kingdom Posts: 3 Member Since: 07/13/06 |
posted July 31, 2006 7:30 AM Hi there, thanks for that suggestion, i got the desired results by setting a boolean value (in the if statement) and then writing out to the screen on the next callback. |
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