Strange behavior of invisible controls

Hello:
I'm updating multiple rows in the datagrid, using the routine described in
the article "Top Questions about the DataGrid Web Server Control":
http://msdn.microsoft.com/library/d...>
ercontrol.asp
To determine which rows had been changed, I'm using the RowChanged sub:
Protected Sub RowChanged(ByVal sender As Object, _
ByVal e As System.EventArgs)
'----
--
' Add ID's for changed rows
'----
--
Try
Dim dgi As DataGridItem = _
CType(CType(sender, Control).NamingContainer, DataGridItem)
Dim IDlabel As Label = CType(dgi.FindControl("lblOrder"), Label)
Dim ID As Integer = CType(IDlabel.Text, Integer)
If Not (IDlist.Contains(ID)) Then
IDlist.Add(ID)
End If
Catch ex As Exception
Me.lblError.Text = "Error No.: " & Err.Number.ToString & " - " & ex.ToString
End Try
End Sub
<asp:CheckBox id="chkInHouse" ToolTip="Plates In House" runat="server"
OnCheckedChanged="RowChanged" Checked='<%# DataBinder.Eval(Container,
"DataItem.InHouse") %>'>
It works OK everywhere, except one datagrid where some of my checkboxes are
invisible - the user has to click a button to make them visible. These
invisible checkboxes always indicate that their values had been changed. As
a result all my data from the datagrid is sent to the database, even if no
changes has been made. As soon as I make these checkboxes visible -
everything works OK.
Why is this happening? Is there any workaround?
I would appreciate your help.
Thank you,
Peter AfoninHi,
If you set checkbox visibility by visible property and you are using
postback to change visible state maybe there is something in the
postback activity that cause that behavior.
you can change check box visibility by changing visibility attribute of
control Style using javascrit thus reducing network traffic.
Natty Gur[MVP]
blog : http://weblogs.asp.net/ngur
Mobile: +972-(0)58-888377
*** Sent via Developersdex http://www.examnotes.net ***
Don't just participate in USENET...get rewarded for it!
Thank you, Natty.
Do you have a JavaScript sample on how to do this? I don't know JS well.
Peter
"Natty Gur" <natty@.dao2com.com> wrote in message
news:Occ$GsiPEHA.164@.TK2MSFTNGP12.phx.gbl...
> Hi,
> If you set checkbox visibility by visible property and you are using
> postback to change visible state maybe there is something in the
> postback activity that cause that behavior.
> you can change check box visibility by changing visibility attribute of
> control Style using javascrit thus reducing network traffic.
> Natty Gur[MVP]
> blog : http://weblogs.asp.net/ngur
> Mobile: +972-(0)58-888377
>
> *** Sent via Developersdex http://www.examnotes.net ***
> Don't just participate in USENET...get rewarded for it!

Strange behavior of invisible controls

Hello:

I'm updating multiple rows in the datagrid, using the routine described in
the article "Top Questions about the DataGrid Web Server Control":

http://msdn.microsoft.com/library/d...ercontrol. asp

To determine which rows had been changed, I'm using the RowChanged sub:

Protected Sub RowChanged(ByVal sender As Object, _
ByVal e As System.EventArgs)
'-----------------------
-------
' Add ID's for changed rows
'-----------------------
-------
Try
Dim dgi As DataGridItem = _
CType(CType(sender, Control).NamingContainer, DataGridItem)
Dim IDlabel As Label = CType(dgi.FindControl("lblOrder"), Label)
Dim ID As Integer = CType(IDlabel.Text, Integer)
If Not (IDlist.Contains(ID)) Then
IDlist.Add(ID)
End If
Catch ex As Exception
Me.lblError.Text = "Error No.: " & Err.Number.ToString & " - " & ex.ToString
End Try
End Sub

<asp:CheckBox id="chkInHouse" ToolTip="Plates In House" runat="server"
OnCheckedChanged="RowChanged" Checked='<%# DataBinder.Eval(Container,
"DataItem.InHouse") %>'
It works OK everywhere, except one datagrid where some of my checkboxes are
invisible - the user has to click a button to make them visible. These
invisible checkboxes always indicate that their values had been changed. As
a result all my data from the datagrid is sent to the database, even if no
changes has been made. As soon as I make these checkboxes visible -
everything works OK.

Why is this happening? Is there any workaround?

I would appreciate your help.

Thank you,

--
Peter AfoninHi,

If you set checkbox visibility by visible property and you are using
postback to change visible state maybe there is something in the
postback activity that cause that behavior.

you can change check box visibility by changing visibility attribute of
control Style using javascrit thus reducing network traffic.

Natty Gur[MVP]

blog : http://weblogs.asp.net/ngur
Mobile: +972-(0)58-888377

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!
Thank you, Natty.

Do you have a JavaScript sample on how to do this? I don't know JS well.

Peter

"Natty Gur" <natty@.dao2com.com> wrote in message
news:Occ$GsiPEHA.164@.TK2MSFTNGP12.phx.gbl...
> Hi,
> If you set checkbox visibility by visible property and you are using
> postback to change visible state maybe there is something in the
> postback activity that cause that behavior.
> you can change check box visibility by changing visibility attribute of
> control Style using javascrit thus reducing network traffic.
> Natty Gur[MVP]
> blog : http://weblogs.asp.net/ngur
> Mobile: +972-(0)58-888377
>
> *** Sent via Developersdex http://www.developersdex.com ***
> Don't just participate in USENET...get rewarded for it!

Strange CSS problem

I have a DotNet Table (asp:Table)
in that table, I have multiple rows and cells, of course -
One table cell is designated for 'content' -
I originally had just assigned a style inline with the tag:
<asp:TableCell Width="615" align="Left" valign="Top" Style="BORDER-TOP:
#000000 2px solid;" ID="ContentCell">
This worked fine.

However, the owners of the page decided it needed a change - on the click of
a button, the styles, etc for the page needed to be changed for the
implementation they needed (long story - won't bore you with that)

so - the page already had a stylesheet linked to it - so I created a new
class:
..TopBorder2 {BORDER-TOP: #000000 12px solid;}

then, I changed the cell to :
<asp:TableCell Width="615" align="Left" valign="Top" CssClass="TopBorder2"
ID="ContentCell"
At this point, I also created a TopBorder0 class, to blank out that border
on the button click...great idea - right?
The CssClass attribute wasn't available at all...I've tried moving it to
the Page_Prerender, the Page_load and included it in the tag itself - it
never rendered to the page

any ideas?when in doubt resort to the tried and true method...
..Attributes.Add("class","TopBorder1")

--
Curt Christianson
site: http://www.darkfalz.com
blog: http://blog.darkfalz.com

"Elmo Watson" wrote:

> I have a DotNet Table (asp:Table)
> in that table, I have multiple rows and cells, of course -
> One table cell is designated for 'content' -
> I originally had just assigned a style inline with the tag:
> <asp:TableCell Width="615" align="Left" valign="Top" Style="BORDER-TOP:
> #000000 2px solid;" ID="ContentCell">
> This worked fine.
> However, the owners of the page decided it needed a change - on the click of
> a button, the styles, etc for the page needed to be changed for the
> implementation they needed (long story - won't bore you with that)
> so - the page already had a stylesheet linked to it - so I created a new
> class:
> ..TopBorder2 {BORDER-TOP: #000000 12px solid;}
> then, I changed the cell to :
> <asp:TableCell Width="615" align="Left" valign="Top" CssClass="TopBorder2"
> ID="ContentCell">
> At this point, I also created a TopBorder0 class, to blank out that border
> on the button click...great idea - right?
> The CssClass attribute wasn't available at all...I've tried moving it to
> the Page_Prerender, the Page_load and included it in the tag itself - it
> never rendered to the page
> any ideas?
>
if the button click only need to change styles (if you are currently posting
back only to change the style) javascript would be the best solution...

<script>
function ChangeStyle()
{
document.getElementById("ContentCell").className = "TopBorder0";
}
</script
calling this client side function on button click will change the style

"Elmo Watson" wrote:

> I have a DotNet Table (asp:Table)
> in that table, I have multiple rows and cells, of course -
> One table cell is designated for 'content' -
> I originally had just assigned a style inline with the tag:
> <asp:TableCell Width="615" align="Left" valign="Top" Style="BORDER-TOP:
> #000000 2px solid;" ID="ContentCell">
> This worked fine.
> However, the owners of the page decided it needed a change - on the click of
> a button, the styles, etc for the page needed to be changed for the
> implementation they needed (long story - won't bore you with that)
> so - the page already had a stylesheet linked to it - so I created a new
> class:
> ..TopBorder2 {BORDER-TOP: #000000 12px solid;}
> then, I changed the cell to :
> <asp:TableCell Width="615" align="Left" valign="Top" CssClass="TopBorder2"
> ID="ContentCell">
> At this point, I also created a TopBorder0 class, to blank out that border
> on the button click...great idea - right?
> The CssClass attribute wasn't available at all...I've tried moving it to
> the Page_Prerender, the Page_load and included it in the tag itself - it
> never rendered to the page
> any ideas?
I just tried:
ContentCell.Attributes.Add("class","TopBorder2")
in Page_load, but it didn't render to the page...

what am I missing?

"Curt_C [MVP]" <software_at_darkfalz.com> wrote in message
news:1E9E8E4D-255D-4E37-BF6B-C67D2C9BA13D@.microsoft.com...
> when in doubt resort to the tried and true method...
> .Attributes.Add("class","TopBorder1")
> --
> Curt Christianson
> site: http://www.darkfalz.com
> blog: http://blog.darkfalz.com
>
> "Elmo Watson" wrote:
>> I have a DotNet Table (asp:Table)
>> in that table, I have multiple rows and cells, of course -
>> One table cell is designated for 'content' -
>> I originally had just assigned a style inline with the tag:
>> <asp:TableCell Width="615" align="Left" valign="Top" Style="BORDER-TOP:
>> #000000 2px solid;" ID="ContentCell">
>> This worked fine.
>>
>> However, the owners of the page decided it needed a change - on the click
>> of
>> a button, the styles, etc for the page needed to be changed for the
>> implementation they needed (long story - won't bore you with that)
>>
>> so - the page already had a stylesheet linked to it - so I created a new
>> class:
>> ..TopBorder2 {BORDER-TOP: #000000 12px solid;}
>>
>> then, I changed the cell to :
>> <asp:TableCell Width="615" align="Left" valign="Top"
>> CssClass="TopBorder2"
>> ID="ContentCell">
>>
>> At this point, I also created a TopBorder0 class, to blank out that
>> border
>> on the button click...great idea - right?
>> The CssClass attribute wasn't available at all...I've tried moving it to
>> the Page_Prerender, the Page_load and included it in the tag itself - it
>> never rendered to the page
>>
>> any ideas?
>>
>>
>
runat=server

--
Curt Christianson
site: http://www.darkfalz.com
blog: http://blog.darkfalz.com

"David Wier" wrote:

> I just tried:
> ContentCell.Attributes.Add("class","TopBorder2")
> in Page_load, but it didn't render to the page...
> what am I missing?
>
> "Curt_C [MVP]" <software_at_darkfalz.com> wrote in message
> news:1E9E8E4D-255D-4E37-BF6B-C67D2C9BA13D@.microsoft.com...
> > when in doubt resort to the tried and true method...
> > .Attributes.Add("class","TopBorder1")
> > --
> > Curt Christianson
> > site: http://www.darkfalz.com
> > blog: http://blog.darkfalz.com
> > "Elmo Watson" wrote:
> >> I have a DotNet Table (asp:Table)
> >> in that table, I have multiple rows and cells, of course -
> >> One table cell is designated for 'content' -
> >> I originally had just assigned a style inline with the tag:
> >> <asp:TableCell Width="615" align="Left" valign="Top" Style="BORDER-TOP:
> >> #000000 2px solid;" ID="ContentCell">
> >> This worked fine.
> >>
> >> However, the owners of the page decided it needed a change - on the click
> >> of
> >> a button, the styles, etc for the page needed to be changed for the
> >> implementation they needed (long story - won't bore you with that)
> >>
> >> so - the page already had a stylesheet linked to it - so I created a new
> >> class:
> >> ..TopBorder2 {BORDER-TOP: #000000 12px solid;}
> >>
> >> then, I changed the cell to :
> >> <asp:TableCell Width="615" align="Left" valign="Top"
> >> CssClass="TopBorder2"
> >> ID="ContentCell">
> >>
> >> At this point, I also created a TopBorder0 class, to blank out that
> >> border
> >> on the button click...great idea - right?
> >> The CssClass attribute wasn't available at all...I've tried moving it to
> >> the Page_Prerender, the Page_load and included it in the tag itself - it
> >> never rendered to the page
> >>
> >> any ideas?
> >>
> >>
> >>
>

Strange event behavior with check boxes

I've designed a gridview that contains a template field with an
unbound checkbox, allowing the user to select certain rows for further
action.
I am capturing the CheckedChanged event in order to set the grid's
SelectedIndex equal to the row whose check box was checked or
unchecked. However, for some strange reason when I click a checkbox
the CheckedChanged event fires for every checked checkbox in the grid,
from top to bottom. Consequently, the SelectedIndex always ends up
being the last checked row.
Can anyone shed some light on this behavior?
-- HansOn Jul 26, 9:23 pm, Froefel <hansdeschry...@.gmail.com> wrote:
> I've designed a gridview that contains a template field with an
> unbound checkbox, allowing the user to select certain rows for further
> action.
> I am capturing the CheckedChanged event in order to set the grid's
> SelectedIndex equal to the row whose check box was checked or
> unchecked. However, for some strange reason when I click a checkbox
> the CheckedChanged event fires for every checked checkbox in the grid,
> from top to bottom. Consequently, the SelectedIndex always ends up
> being the last checked row.
> Can anyone shed some light on this behavior?
> -- Hans
Hi...
can you please provide some code sample...
Masudur

Strange problem

Ok, I have this ASP.NET application I am making.

the main code is the updateTable(), this function populates a Table web control with rows of data, the last cell being a button, this button is attached an attribute to identify the row. A click event is attached to this button. The click event of this button fires the updateTable() again, using the attached attribute as the argument (sort of like a file structure, and the button says, enter this directory so it passes the directory name of that row, and reloads the table with the dir/files of that directory.

Now here is the problem, if I have my initial set root directory and updateTable(root dir) in the page_load, the click event fires correctly, but of course the updateTable gets called twice (which works as the click event is after the first one), but when you try to drill down a second time, it fouls it up because the path gets reset to the begining, and the new path doesn't exist there.

What I am trying to do is this.

Page_Load()

If (!Page.PostBack)
updateTable(Default Path)

Then have my button click event do

updateTable(myButton.Attributes["newDir"].ToString();

But with out the updateTable event firing on Page_Load, the click event does not get handled.

Hopefully this makes sense, if need more info, let me know.I been playing around with this problem for a bit tonight. And I made some changes.

I made the button click event simple set Session["currentDir"] and changed the Page_Load to call updateTable(Session["currentDir"].ToString(); and in the !Page.PostBack clause, I have it setting Session["currentDir"] to the application parameter setting for "rootDir" I have.

Now everything works, but... You got to click twice on all the buttons and I can't seem to figure out how to avoid that. The problem appears to be the click event doesn't fire until after the page is reloaded so the first time it has the last directory set, and changes the session variable, but will only update the table when you click it yet again.
It's a timing issue. You have to consider the fact that events are called after Load and before PreRender. Thus, if you make changes to the data from an event, you need to rebind the controls that depend on this data after you've made the change. Otherwise, the change will only be visible on the next postback (hence the "double click").
By the way, it's not a very good idea to use Session in this context.
Does this help?
How do you rebind the control, you mean attach the button handler to it again?

I tried doing it so that button event called the updateTable() function, but that didn't work unless the event fired in the beginning of page load, so I changed it to a session variable see if that helped. It make the thing work, but didn't solve the problem as now I have to click twice.
No, WhateverControl.DataBind();

The structure of your page should more or less be:

Init: create controls if necessary.
Load: read datasources and bind controls if not ispostback
Events: update data sources according to the event and rebind relevant controls.