[RESOLVED] [2005] Set selected listbox items programmatically

[aconybeare]

Hi,

I'm trying to set up a multiple select list boxes selected items, but it's only displaying the last item. Does anyone know how to do this?

This is what I have -

...
Dim sSSect_Ids As String = clAct.DeNull(dr("SSection_Ids"))
If sSSect_Ids <> vbNullString Then
    Dim sVals() As String = sSSect_Ids.Split(",".ToCharArray)
    Dim i As Int32 = -1
    Dim uBnd As Int32 = UBound(sVals)
    For i = 0 To uBnd
        sVals(i) = clAct.DeNull(sVals(i).Trim)
        If sVals(i) <> vbNullString Then
            Me.ddlSSection.SelectedValue = Convert.ToString(sVals(i))
        End If
    Next
End If
...

Al

[aconybeare]

I've managed to solve it, using .Items.FindByValue(s) and item(s).Selected=True -

Dim sSSect_Ids As String = clAct.DeNull(dr("SSection_Ids"))
If sSSect_Ids <> vbNullString Then
    Dim sVals() As String = sSSect_Ids.Split(",".ToCharArray)
    Dim i As Int32 = -1
    Dim uBnd As Int32 = UBound(sVals)
    For i = 0 To uBnd
        sVals(i) = clAct.DeNull(sVals(i).Trim)
        If sVals(i) <> vbNullString Then
            sVals(i) = Convert.ToString(sVals(i))
            If Not Me.ddlSSection.Items.FindByValue(sVals(i).ToString) Is Nothing Then
                Me.ddlSSection.Items(sVals(i).ToString).Selected = True
            End If
        End If
    Next
End If

[mendhak]

Use the ASP.NET Listbox control. To read the selected items, use

For i = 0 to ListBox1.Items.Count
If ListBox1.Items(i).Selected = True Then
'Do something with ListBox1.Items(i)
End If
Next i

[aconybeare]

Mendhak,

Thanks for your reply, I'm not sure but think there might be a slight misunderstanding with my question. Your suggestion is exactly what I'm using to save the users selections to my DB. I was having trouble setting the default items (the items chosen previously) when a user edits a record

If you have a better way of achieving this then I'd be delighted to see it

Cheers Al

[mendhak]

Ah yeah, your first post was a bit vague, so I jumped to the most common problem encountered with listboxes.

Your method is fine then, because all you need is some way to persist the values across postbacks or from elsewhere.