I am using ajax toolkit and the timer for countdown function.

It works fine except that it jumps over seconds ... although the interval of the timer is 1000 milliseconds.

For example if it needs to count down from 60 to 0 it does that like following:

60, 59, 57, 56, 54, 51, 50, 48 .... etc. etc.

How do i fix this problem so the timer counts every second? Thanks

It's probably a 'leaky boundary' condition.  The timer is doing:

60000

59000

57999    // skips 58

56999

55990

You could use your own int variable and decrement it 'about' every one second.

Thanks for the quick response.

I must say it makes a perfect sense to me but, i am not sure about your suggestion of using own int var

could you give an example? it will be much appreciated!

There is more than one way.

Are you using an Updatepanel and Server side functions to update the label?

Or, are you doing it all at the client?

SGWellens:

There is more than one way.

Are you using an Updatepanel and Server side functions to update the label?

Or, are you doing it all at the client?

I am using UpdatePanel and Timer tick event to update the label controls

Dim time As New TimeSpan()
time = DirectCast(Session("Time"), DateTime) - DateTime.Now

labelDays.Text = time.Days.ToString()
labelHours.Text = time.Hours.ToString()
labelMinutes.Text = time.Minutes.ToString()
labelSeconds.Text = time.Seconds.ToString()

 You could use the techique below to get "even" counting but the clock will eventually drift off. 

protected void UpdateCounter(object sender, EventArgs e)
{
    DateTime MyTimer;

    //if (Session["Timer"] == null)
    //    MyTimer = DateTime.MinValue;
    //else
    //    MyTimer = (DateTime)Session["Timer"];

    // "Fancy" version of above 4 lines using null coalescing operator
    MyTimer = (DateTime)(Session["Timer"] ?? DateTime.MinValue);

    LabelCounter.Text = MyTimer.Second.ToString();

    MyTimer = MyTimer.AddSeconds(1);

    Session["Timer"] = MyTimer;
}

Ok this really makes sense but how do i combine this with the TimeSpan anyway?

I need to subtrack a DateTime.Now from the DateTime which is retrieved from DB.

Pratically this is countdown ... Thanks!

 Here's another version:

protected void UpdateCounter(object sender, EventArgs e)
{
    TimeSpan MyTimer;

    if (Session["Timer"] == null)
        MyTimer = TimeSpan.FromSeconds(60);
    else
        MyTimer = (TimeSpan)Session["Timer"];

    LabelCounter.Text = MyTimer.Seconds.ToString();

    MyTimer = MyTimer.Subtract(TimeSpan.FromSeconds(1));

    Session["Timer"] = MyTimer;
}

Hi Steve,

I believe you expect me to figure out the rest of the code but, i must disappoint you.

I am struglling with this for two days now and my brain is tottaly stuck ...

This is the code that i am currently trying to work out so please if you can modify it to counts each second and update all FOUR labels. Thank you very much for any further help

// Load event
protected void Page_Load(object sender, System.EventArgs e)
{
    if (!IsPostBack) {
        DateTime NextUpdate = "06/30/2009 5:02:00 PM";
        Session("timer") = NextUpdate;
    }
}

// Timer's tick event
protected void Timer1_Tick(object sender, System.EventArgs e)
{
    TimeSpan timeSp = new TimeSpan();
    timeSp = (DateTime)Session("timer") - DateTime.Now;
    if (timeSp.Seconds <= 0 & timeSp.Minutes <= 0 & timeSp.Hours <= 0) {
        labelDays.Text = "00";
        labelHours.Text = "00";
        labelMinutes.Text = "00";
        labelSeconds.Text = "00";
    }
    else {
        labelDays.Text = timeSp.Days.ToString();
        labelHours.Text = timeSp.Hours.ToString();
        labelMinutes.Text = timeSp.Minutes.ToString();
        labelSeconds.Text = timeSp.Seconds.ToString();
    }
}

 http://encosia.com/2007/09/19/aspnet-ajax-timer-trouble-location-is-key/

chetan.sarode:

 http://encosia.com/2007/09/19/aspnet-ajax-timer-trouble-location-is-key/

Unfortunatelly it is not helpful in my sutuation. i'll wait for Steve's answer for a while

KulerMaster:

Unfortunatelly it is not helpful in my sutuation. i'll wait for Steve's answer for a while

I believe you have all the information you need to figure it out. 

KulerMaster:

Hi Steve,

I believe you expect me to figure out the rest of the code but, i must disappoint you.

I am struglling with this for two days now and my brain is tottaly stuck ...

This is the code that i am currently trying to work out so please if you can modify it to counts each second and update all FOUR labels. Thank you very much for any further help

 

view plaincopy to clipboardprint?

1. // Load event  
2. protected void Page_Load(object sender, System.EventArgs e)  
3. {  
4.     if (!IsPostBack) {  
5.         DateTime NextUpdate = "06/30/2009 5:02:00 PM";  
6.         Session("timer") = NextUpdate;  
7.     }  
8. }  
9.   
10. // Timer's tick event  
11. protected void Timer1_Tick(object sender, System.EventArgs e)  
12. {  
13.     TimeSpan timeSp = new TimeSpan();  
14.     timeSp = (DateTime)Session("timer") - DateTime.Now;  
15.     if (timeSp.Seconds <= 0 & timeSp.Minutes <= 0 & timeSp.Hours <= 0) {  
16.         labelDays.Text = "00";  
17.         labelHours.Text = "00";  
18.         labelMinutes.Text = "00";  
19.         labelSeconds.Text = "00";  
20.     }  
21.     else {  
22.         labelDays.Text = timeSp.Days.ToString();  
23.         labelHours.Text = timeSp.Hours.ToString();  
24.         labelMinutes.Text = timeSp.Minutes.ToString();  
25.         labelSeconds.Text = timeSp.Seconds.ToString();  
26.     }  
27. }  

// Load event
protected void Page_Load(object sender, System.EventArgs e)
{
    if (!IsPostBack) {
        DateTime NextUpdate = "06/30/2009 5:02:00 PM";
        Session("timer") = NextUpdate;
    }
}

// Timer's tick event
protected void Timer1_Tick(object sender, System.EventArgs e)
{
    TimeSpan timeSp = new TimeSpan();
    timeSp = (DateTime)Session("timer") - DateTime.Now;
    if (timeSp.Seconds <= 0 & timeSp.Minutes <= 0 & timeSp.Hours <= 0) {
        labelDays.Text = "00";
        labelHours.Text = "00";
        labelMinutes.Text = "00";
        labelSeconds.Text = "00";
    }
    else {
        labelDays.Text = timeSp.Days.ToString();
        labelHours.Text = timeSp.Hours.ToString();
        labelMinutes.Text = timeSp.Minutes.ToString();
        labelSeconds.Text = timeSp.Seconds.ToString();
    }
}

Well as mentioned i am struglling with this issue for 3 days and i can't think of anything more.

Now it's up to you. You can either modify the given code or just ignore it but, i will be thankful anyway.

I am sorry to say this but, it seems that you either do not understand my problem or you also don't know the solution.

Thanks for the willing to help anwyway!