I have an event ItemDataBoundEventHandler which handles
DataGrid1.ItemDataBound. This event applies special formatting to a webform
datagrid at bind-time. I've noticed, however, that when the page containing
this datagrid is posted-back all formatting is lost. Basically when I open
the page the datagrid looks good, but as soon as a postback occurs the
formatting is wiped-out. How could I prevent postback from doing this?
Thanks!
7  1448 
I just tried something similar but didn't have any problems. Can you post
the code for the ItemDataBoundEventHandler
Cheers, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com... I have an event ItemDataBoundEventHandler which handles
DataGrid1.ItemDataBound. This event applies special formatting to a
webform datagrid at bind-time. I've noticed, however, that when the page
containing this datagrid is posted-back all formatting is lost. Basically when I
open the page the datagrid looks good, but as soon as a postback occurs the
formatting is wiped-out. How could I prevent postback from doing this?
Thanks!
Sure. Here is the ItemDataBoundEventHandler and the HTML for the affected
column (Column1). Let me explain...
Column(1) of my datagrid is a hyperlink column. Basically if a value exists
in "ImageFilePath" then I want to display the hyperlink in that datagrid row.
If a value does not exist in "ImageFilePath" then I don't want anything to
dispaly. This works correctly, but as soon as the page is posted-back all
columns have the hyperlink. Thanks.
Sub ItemDataBoundEventHandler(ByVal sender As Object, ByVal e As
DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem Then
Dim imagefilepath As String
imagefilepath =
Convert.ToString(DataBinder.Eval(e.Item.DataItem, "ImageFilePath"))
If imagefilepath = "" Then
e.Item.Cells(1).Text = ""
End If
End If
End Sub
<HTML>
<asp:TemplateColumn>
<HeaderStyle Wrap="False"></HeaderStyle>
<ItemStyle Wrap="False"></ItemStyle>
<ItemTemplate>
<asp:HyperLink runat="server" Text="picture" NavigateURL='<%#
DataBinder.Eval(Container, "DataItem.ImageFilePath") %> ' Target="_blank"
ID="HL99" Name="HyperLink1">
</asp:HyperLink>
</ItemTemplate>
<FooterStyle Wrap="False"></FooterStyle>
</asp:TemplateColumn>
</HTML>
"pete" wrote: I just tried something similar but didn't have any problems. Can you post
the code for the ItemDataBoundEventHandler
Cheers, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com... I have an event ItemDataBoundEventHandler which handles
DataGrid1.ItemDataBound. This event applies special formatting to a
webform datagrid at bind-time. I've noticed, however, that when the page
containing this datagrid is posted-back all formatting is lost. Basically when I
open the page the datagrid looks good, but as soon as a postback occurs the
formatting is wiped-out. How could I prevent postback from doing this?
Thanks!
Sure. Here is the ItemDataBoundEventHandler and the HTML for the affected
column (Column1). Let me explain...
Column(1) of my datagrid is a hyperlink column. Basically if a value exists
in "ImageFilePath" then I want to display the hyperlink in that datagrid row.
If a value does not exist in "ImageFilePath" then I don't want anything to
dispaly. This works correctly, but as soon as the page is posted-back all
columns have the hyperlink. Thanks.
Sub ItemDataBoundEventHandler(ByVal sender As Object, ByVal e As
DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem Then
Dim imagefilepath As String
imagefilepath =
Convert.ToString(DataBinder.Eval(e.Item.DataItem, "ImageFilePath"))
If imagefilepath = "" Then
e.Item.Cells(1).Text = ""
End If
End If
End Sub
<HTML>
<asp:TemplateColumn>
<HeaderStyle Wrap="False"></HeaderStyle>
<ItemStyle Wrap="False"></ItemStyle>
<ItemTemplate>
<asp:HyperLink runat="server" Text="picture" NavigateURL='<%#
DataBinder.Eval(Container, "DataItem.ImageFilePath") %> ' Target="_blank"
ID="HL99" Name="HyperLink1">
</asp:HyperLink>
</ItemTemplate>
<FooterStyle Wrap="False"></FooterStyle>
</asp:TemplateColumn>
</HTML>
"pete" wrote: I just tried something similar but didn't have any problems. Can you post
the code for the ItemDataBoundEventHandler
Cheers, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com... I have an event ItemDataBoundEventHandler which handles
DataGrid1.ItemDataBound. This event applies special formatting to a
webform datagrid at bind-time. I've noticed, however, that when the page
containing this datagrid is posted-back all formatting is lost. Basically when I
open the page the datagrid looks good, but as soon as a postback occurs the
formatting is wiped-out. How could I prevent postback from doing this?
Thanks!
Hi Mike,
I've just ran some tests here and can recreate your problem. However, in
order to do so I have to:
1) Bind the datagrid only on the first page load i.e. if
(!Page.IsPostBack)
2) Enable viewstate for the datagrid
Is this what your doing?
Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:0A**********************************@microsof t.com... Sure. Here is the ItemDataBoundEventHandler and the HTML for the affected
column (Column1). Let me explain...
Column(1) of my datagrid is a hyperlink column. Basically if a value
exists in "ImageFilePath" then I want to display the hyperlink in that datagrid
row. If a value does not exist in "ImageFilePath" then I don't want anything
to dispaly. This works correctly, but as soon as the page is posted-back all
columns have the hyperlink. Thanks.
Sub ItemDataBoundEventHandler(ByVal sender As Object, ByVal e As
DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem Then
Dim imagefilepath As String
imagefilepath =
Convert.ToString(DataBinder.Eval(e.Item.DataItem, "ImageFilePath"))
If imagefilepath = "" Then
e.Item.Cells(1).Text = ""
End If
End If
End Sub
<HTML>
<asp:TemplateColumn>
<HeaderStyle Wrap="False"></HeaderStyle>
<ItemStyle Wrap="False"></ItemStyle>
<ItemTemplate>
<asp:HyperLink runat="server" Text="picture" NavigateURL='<%#
DataBinder.Eval(Container, "DataItem.ImageFilePath") %> ' Target="_blank"
ID="HL99" Name="HyperLink1">
</asp:HyperLink>
</ItemTemplate>
<FooterStyle Wrap="False"></FooterStyle>
</asp:TemplateColumn>
</HTML>
"pete" wrote:
I just tried something similar but didn't have any problems. Can you
post the code for the ItemDataBoundEventHandler
Cheers, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com... I have an event ItemDataBoundEventHandler which handles
DataGrid1.ItemDataBound. This event applies special formatting to a
webform datagrid at bind-time. I've noticed, however, that when the page
containing this datagrid is posted-back all formatting is lost. Basically when I
open the page the datagrid looks good, but as soon as a postback occurs the
formatting is wiped-out. How could I prevent postback from doing
this? Thanks!
pete, Yes to both questions. Thanks for your ongoing assistance!
"pete" wrote: Hi Mike,
I've just ran some tests here and can recreate your problem. However, in
order to do so I have to:
1) Bind the datagrid only on the first page load i.e. if
(!Page.IsPostBack)
2) Enable viewstate for the datagrid
Is this what your doing?
Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:0A**********************************@microsof t.com... Sure. Here is the ItemDataBoundEventHandler and the HTML for the affected
column (Column1). Let me explain...
Column(1) of my datagrid is a hyperlink column. Basically if a value
exists in "ImageFilePath" then I want to display the hyperlink in that datagrid
row. If a value does not exist in "ImageFilePath" then I don't want anything
to dispaly. This works correctly, but as soon as the page is posted-back all
columns have the hyperlink. Thanks.
Sub ItemDataBoundEventHandler(ByVal sender As Object, ByVal e As
DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem Then
Dim imagefilepath As String
imagefilepath =
Convert.ToString(DataBinder.Eval(e.Item.DataItem, "ImageFilePath"))
If imagefilepath = "" Then
e.Item.Cells(1).Text = ""
End If
End If
End Sub
<HTML>
<asp:TemplateColumn>
<HeaderStyle Wrap="False"></HeaderStyle>
<ItemStyle Wrap="False"></ItemStyle>
<ItemTemplate>
<asp:HyperLink runat="server" Text="picture" NavigateURL='<%#
DataBinder.Eval(Container, "DataItem.ImageFilePath") %> ' Target="_blank"
ID="HL99" Name="HyperLink1">
</asp:HyperLink>
</ItemTemplate>
<FooterStyle Wrap="False"></FooterStyle>
</asp:TemplateColumn>
</HTML>
"pete" wrote:
I just tried something similar but didn't have any problems. Can you post the code for the ItemDataBoundEventHandler
Cheers, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:A0**********************************@microsof t.com...
> I have an event ItemDataBoundEventHandler which handles
> DataGrid1.ItemDataBound. This event applies special formatting to a
webform
> datagrid at bind-time. I've noticed, however, that when the page
containing
> this datagrid is posted-back all formatting is lost. Basically when I
open
> the page the datagrid looks good, but as soon as a postback occurs the
> formatting is wiped-out. How could I prevent postback from doing this? > Thanks!
Glad to help.
The ItemDataBound event fires when you call the DataGridx.DataBind() method
(or the Page.DataBind() method which will make the call for you). Your code
only calls DataBind on first load and not on subsequent postbacks. To get
round this problem you will need to bind the DataGrid on each Page Load.
If you decide to do this, set the EnableViewState to false as the Datagrid
control will no longer need to retrieve its content from viewstate. If you
look at the html which is output to the browser, you should see that the
hidden _Viewstate field is considerably shorter.
Best of luck, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:65**********************************@microsof t.com... pete, Yes to both questions. Thanks for your ongoing assistance!
"pete" wrote:
Hi Mike,
I've just ran some tests here and can recreate your problem. However, in
order to do so I have to:
1) Bind the datagrid only on the first page load i.e. if
(!Page.IsPostBack)
2) Enable viewstate for the datagrid
Is this what your doing?
Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:0A**********************************@microsof t.com... Sure. Here is the ItemDataBoundEventHandler and the HTML for the
affected column (Column1). Let me explain...
Column(1) of my datagrid is a hyperlink column. Basically if a value
exists in "ImageFilePath" then I want to display the hyperlink in that
datagrid row. If a value does not exist in "ImageFilePath" then I don't want
anything to dispaly. This works correctly, but as soon as the page is posted-back
all columns have the hyperlink. Thanks.
Sub ItemDataBoundEventHandler(ByVal sender As Object, ByVal e As
DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem Then
Dim imagefilepath As String
imagefilepath =
Convert.ToString(DataBinder.Eval(e.Item.DataItem, "ImageFilePath"))
If imagefilepath = "" Then
e.Item.Cells(1).Text = ""
End If
End If
End Sub
<HTML>
<asp:TemplateColumn>
<HeaderStyle Wrap="False"></HeaderStyle>
<ItemStyle Wrap="False"></ItemStyle>
<ItemTemplate>
<asp:HyperLink runat="server" Text="picture" NavigateURL='<%#
DataBinder.Eval(Container, "DataItem.ImageFilePath") %> '
Target="_blank" ID="HL99" Name="HyperLink1">
</asp:HyperLink>
</ItemTemplate>
<FooterStyle Wrap="False"></FooterStyle>
</asp:TemplateColumn>
</HTML>
"pete" wrote:
> I just tried something similar but didn't have any problems. Can you
post > the code for the ItemDataBoundEventHandler
>
> Cheers, Pete
>
> "MrMike" <Mr****@discussions.microsoft.com> wrote in message
> news:A0**********************************@microsof t.com...
> > I have an event ItemDataBoundEventHandler which handles
> > DataGrid1.ItemDataBound. This event applies special formatting to
a > webform
> > datagrid at bind-time. I've noticed, however, that when the page
> containing
> > this datagrid is posted-back all formatting is lost. Basically
when I > open
> > the page the datagrid looks good, but as soon as a postback occurs
the > > formatting is wiped-out. How could I prevent postback from doing
this? > > Thanks!
>
>
>
Pete, What I've done is added a call to the sub that performs the bind at the
end of this sub. That solved the problem! Thanks for your help.
"pete" wrote: Glad to help.
The ItemDataBound event fires when you call the DataGridx.DataBind() method
(or the Page.DataBind() method which will make the call for you). Your code
only calls DataBind on first load and not on subsequent postbacks. To get
round this problem you will need to bind the DataGrid on each Page Load.
If you decide to do this, set the EnableViewState to false as the Datagrid
control will no longer need to retrieve its content from viewstate. If you
look at the html which is output to the browser, you should see that the
hidden _Viewstate field is considerably shorter.
Best of luck, Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:65**********************************@microsof t.com... pete, Yes to both questions. Thanks for your ongoing assistance!
"pete" wrote:
Hi Mike,
I've just ran some tests here and can recreate your problem. However, in
order to do so I have to:
1) Bind the datagrid only on the first page load i.e. if
(!Page.IsPostBack)
2) Enable viewstate for the datagrid
Is this what your doing?
Pete
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:0A**********************************@microsof t.com...
> Sure. Here is the ItemDataBoundEventHandler and the HTML for the affected > column (Column1). Let me explain...
> Column(1) of my datagrid is a hyperlink column. Basically if a value
exists
> in "ImageFilePath" then I want to display the hyperlink in that datagrid row.
> If a value does not exist in "ImageFilePath" then I don't want anything to
> dispaly. This works correctly, but as soon as the page is posted-back all > columns have the hyperlink. Thanks.
>
> Sub ItemDataBoundEventHandler(ByVal sender As Object, ByVal e As
> DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
> If e.Item.ItemType = ListItemType.Item Or _
> e.Item.ItemType = ListItemType.AlternatingItem Then
>
> Dim imagefilepath As String
> imagefilepath =
> Convert.ToString(DataBinder.Eval(e.Item.DataItem, "ImageFilePath"))
>
> If imagefilepath = "" Then
> e.Item.Cells(1).Text = ""
> End If
>
> End If
> End Sub
>
> <HTML>
> <asp:TemplateColumn>
> <HeaderStyle Wrap="False"></HeaderStyle>
> <ItemStyle Wrap="False"></ItemStyle>
> <ItemTemplate>
> <asp:HyperLink runat="server" Text="picture" NavigateURL='<%#
> DataBinder.Eval(Container, "DataItem.ImageFilePath") %> ' Target="_blank" > ID="HL99" Name="HyperLink1">
> </asp:HyperLink>
> </ItemTemplate>
> <FooterStyle Wrap="False"></FooterStyle>
> </asp:TemplateColumn>
> </HTML>
>
> "pete" wrote:
>
> > I just tried something similar but didn't have any problems. Can you
post
> > the code for the ItemDataBoundEventHandler
> >
> > Cheers, Pete
> >
> > "MrMike" <Mr****@discussions.microsoft.com> wrote in message
> > news:A0**********************************@microsof t.com...
> > > I have an event ItemDataBoundEventHandler which handles
> > > DataGrid1.ItemDataBound. This event applies special formatting to a > > webform
> > > datagrid at bind-time. I've noticed, however, that when the page
> > containing
> > > this datagrid is posted-back all formatting is lost. Basically when I > > open
> > > the page the datagrid looks good, but as soon as a postback occurs the > > > formatting is wiped-out. How could I prevent postback from doing
this?
> > > Thanks!
> >
> >
> >
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