Using Timer and Update Panel to update a label

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raefkobeissi

Member

2 Points

8 Posts

Using Timer and Update Panel to update a label

Jun 16, 2018 03:20 PM|raefkobeissi|LINK

Hi

I appreciate your help with this. I am creating a very simple aspx page with 1 label and 1 button. I am trying to update the label every 200 ms by adding 1 to the previous value. when I run the program the label stops at 1:

Public Class WebForm1
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub
    Dim c = 0
    Protected Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick

        c = c + 1
        Label1.Text = c
    End Sub

    Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Timer1.Interval = 200

        Timer1.Enabled = True

    End Sub
End Class

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication13.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel2" runat="server">
<Triggers>
 <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
 </Triggers>

            <ContentTemplate>
        <div>
        </div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
         <asp:Button ID="Button1" runat="server" Text="Button" />
        
      
      </ContentTemplate>
              </asp:UpdatePanel>
        <asp:Timer ID="Timer1" runat="server">

        </asp:Timer>
       
    </form>
</body>
</html>

Can you please tell me what I am doing wrong?

Cheers

</div> </div>

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mgebhard

All-Star

48451 Points

21310 Posts

Re: Using Timer and Update Panel to update a label

Jun 16, 2018 04:00 PM|mgebhard|LINK

IMHO, It’s unrealistic to make 5 requests a second. However, the following SO post shows the syntax.

https://stackoverflow.com/questions/3523470/timer-in-updatepanel

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raefkobeissi

Member

2 Points

8 Posts

Re: Using Timer and Update Panel to update a label

Jun 16, 2018 04:07 PM|raefkobeissi|LINK

Thank you for your reply. I agree with you. I changed the request to 1 request every 5 seconds. It is still not working. I also checked the link and to be honest, it wasn't different compared to my code. When I press the button, the Label counts 1 and then stops, it doesn't update from there onward.

Your help is much appreciated.

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mgebhard

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48451 Points

21310 Posts

Re: Using Timer and Update Panel to update a label

Jun 16, 2018 05:59 PM|mgebhard|LINK

raefkobeissi

Thank you for your reply. I agree with you. I changed the request to 1 request every 5 seconds. It is still not working. I also checked the link and to be honest, it wasn't different compared to my code. When I press the button, the Label counts 1 and then stops, it doesn't update from there onward.

Your help is much appreciated.

Perhaps this tutorial is more direct.

https://msdn.microsoft.com/en-us/library/bb386404.aspx

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Brando ZWZ

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9801 Points

3120 Posts

Re: Using Timer and Update Panel to update a label

Jun 19, 2018 09:14 AM|Brando ZWZ|LINK

Hi raefkobeissi,

As far as I know, if the timer trigger the tick event, the server will run all the code inside the TimerWithUpdatePanel page code-behind.

So it will reset the c to 0 and plus 1 again. You will find it always show 1.

I suggest you could set a breakpoint at the page load event to see how the page works. This is related with the asp.net web form page life.

I suggest you could consider directly get the current textbox value and plus 1.

It will work well.

More details, you could refer to below codes:

ASPX:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="TimerWithUpdatePanel.aspx.vb" Inherits="VBWebform.TimerWithUpdatePanel" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
                </Triggers>
                <ContentTemplate>
                    <div>
                    </div>
                    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
                    <asp:Button ID="Button1" runat="server" Text="Button" />
                </ContentTemplate>
            </asp:UpdatePanel>
            <asp:Timer ID="Timer1" runat="server">
            </asp:Timer>
        </div>
    </form>
</body>
</html>

Code-behind:

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub
    Dim c = 0
    Protected Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick

        If Label1.Text <> "Label" Then
            c = Convert.ToInt32(Label1.Text)
        End If
        c = c + 1
        Label1.Text = c
    End Sub

    Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Timer1.Interval = 1000
        Timer1.Enabled = True
    End Sub

Result:

Rest Regards,

Brando

MSDN Community Support
Please remember to click "Mark as Answer" the responses that resolved your issue.
If you have any compliments or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com.

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raefkobeissi

Member

2 Points

8 Posts

Re: Using Timer and Update Panel to update a label

Jun 19, 2018 10:48 AM|raefkobeissi|LINK

Thank you for your reply! I managed to make it work on my localhost but once uploaded to the server which allows AJAX it just doesnt work at all when I click the button. It looks like the timer doesn’t appear to be working. I am wondering if I am missing something in the web.config file . On Localhost it works perfectly!
Something simple I am missing there that is making it not work on the server.

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Brando ZWZ

Star

9801 Points

3120 Posts

Re: Using Timer and Update Panel to update a label

Jun 19, 2018 12:49 PM|Brando ZWZ|LINK

Hi raefkobeissi,

raefkobeissi
Thank you for your reply! I managed to make it work on my localhost but once uploaded to the server which allows AJAX it just doesnt work at all when I click the button. It looks like the timer doesn’t appear to be working. I am wondering if I am missing something in the web.config file . On Localhost it works perfectly!

According to your description, it is too hard directly find out the reason why it doesn't work well on the server,

Do you have any error message?

I suggest you could use f12 developtool's network tag to see how the ajax works and check the error message.

Besides, since this issue is not related with your first thread, I suggest you could firstly mark the helpful reply as answer and start a new thread to talk about your new issue.

This will help other people who faces the same issue.

Best Regards,

Brando

MSDN Community Support
Please remember to click "Mark as Answer" the responses that resolved your issue.
If you have any compliments or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com.

Reply

raefkobeissi

Member

2 Points

8 Posts

Re: Using Timer and Update Panel to update a label

Jun 19, 2018 01:14 PM|raefkobeissi|LINK

Thank you, I created a new thread as advised:

https://forums.asp.net/p/2142524/6213057.aspx?p=True&t=636649855446131352

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