DropDownList resets selectedIndex on postback

28 Jan 2006 11:24 AM

Juan Puebla

Hi,

I have a dropdownlist (ddL). When I run the app and I try to select an item
it alsways get selected the first item. I fill the ddl on pageload with: "if
not ispostback" statement. Function that fills the ddl:

For i = 0 To alAsigs.Count - 1
                Dim c As New ListItem
                c.Text = alAsigs(i).NombreAsignatura & " (" &
alAsigs(i).Curso & alAsigs(i).Grupo & ")"
                c.Value = alAsigs(i).IdEsAsignatura
                ddlAsignaturasExam.Items.Add(c)
            End If
Next

This is going me crazy as it's the first time I get this problem (I just
changed from .NET 1.1 to NET 2.0).

Any help?

Thanks

Juan Puebla

30 Jan 2006 3:43 AM

Nathan Sokalski

One thing I would check is to make sure that the EnableViewState=True for
the DropDownList. Also, make sure that you do not have EnableViewState=False
in your .aspx's @Page directive. Also, I would like to ask why do you have
your End If line before your Next line? Take a look at these things,
if you still have the problem try posting the complete code for people to
see, sometimes there are things we don't think of the first time around.

--
Nathan Sokalski
njsokal***@hotmail.com
http://www.nathansokalski.com/

Show quoteHide quote

"Juan Puebla" <JuanPue***@discussions.microsoft.com> wrote in message
news:CF6859DE-8F68-472E-BB50-2EF57DFABCC0@microsoft.com...
> Hi,
>
> I have a dropdownlist (ddL). When I run the app and I try to select an
> item
> it alsways get selected the first item. I fill the ddl on pageload with:
> "if
> not ispostback" statement. Function that fills the ddl:
>
> For i = 0 To alAsigs.Count - 1
>                Dim c As New ListItem
>                c.Text = alAsigs(i).NombreAsignatura & " (" &
> alAsigs(i).Curso & alAsigs(i).Grupo & ")"
>                c.Value = alAsigs(i).IdEsAsignatura
>                ddlAsignaturasExam.Items.Add(c)
>            End If
> Next
>
>
> This is going me crazy as it's the first time I get this problem (I just
> changed from .NET 1.1 to NET 2.0).
>
> Any help?
>
>
> Thanks
>
> Juan Puebla

30 Jan 2006 6:02 AM

Juan Puebla

Thanks for your answer. There was a line missing to start If statement. As
you see, I've changed the "value" of each listitem. Now I also use the
variable "i" with a coma. I don't know why but with this it works. When I
need the value I use a substring(indexof(",") + 1). I don't really understand
why....

Dim i As Int16
        For i = 0 To alAsigs.Count - 1
            If alAsigs(i).Trimestre = ddlTrimExam.SelectedItem.Text Or
alAsigs(i).Trimestre = 0 Then
                Dim c As New ListItem
                c.Text = alAsigs(i).NombreAsignatura & " (" &
alAsigs(i).Curso & alAsigs(i).Grupo & ")"
                c.Value = i & "," & alAsigs(i).IdEsAsignatura
                ddlAsignaturasExam.Items.Add(c)
            End If
        Next

Show quoteHide quote

"Nathan Sokalski" wrote:

> One thing I would check is to make sure that the EnableViewState=True for
> the DropDownList. Also, make sure that you do not have EnableViewState=False
> in your .aspx's @Page directive. Also, I would like to ask why do you have
> your   End If   line before your   Next   line? Take a look at these things,
> if you still have the problem try posting the complete code for people to
> see, sometimes there are things we don't think of the first time around.
> --
> Nathan Sokalski
> njsokal***@hotmail.com
> http://www.nathansokalski.com/
>
> "Juan Puebla" <JuanPue***@discussions.microsoft.com> wrote in message
> news:CF6859DE-8F68-472E-BB50-2EF57DFABCC0@microsoft.com...
> > Hi,
> >
> > I have a dropdownlist (ddL). When I run the app and I try to select an
> > item
> > it alsways get selected the first item. I fill the ddl on pageload with:
> > "if
> > not ispostback" statement. Function that fills the ddl:
> >
> > For i = 0 To alAsigs.Count - 1
> >                Dim c As New ListItem
> >                c.Text = alAsigs(i).NombreAsignatura & " (" &
> > alAsigs(i).Curso & alAsigs(i).Grupo & ")"
> >                c.Value = alAsigs(i).IdEsAsignatura
> >                ddlAsignaturasExam.Items.Add(c)
> >            End If
> > Next
> >
> >
> > This is going me crazy as it's the first time I get this problem (I just
> > changed from .NET 1.1 to NET 2.0).
> >
> > Any help?
> >
> >
> > Thanks
> >
> > Juan Puebla
>
>
>