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Selecting multiple items from a listbox

Posted on 2013-06-14
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Last Modified: 2013-06-17
I would like to be able to select multiple items from a listbox and then act on that selection list. Each item selected would initiate separate processing later in my code. I don't do alot with forms and am having trouble finding a good example of that.

Flow:
1. Select multiple items form the list box.
2. If none is selected then assume all items in the box are to be used
3. Read each item to a separate variable and initiate code later on in the script based on the variable.

I imagine that I could read the listbox multiple times for to init the subsequent steps which just consists mainly of importing various data files.
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Question by:BillTr
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2 Comments
 
LVL 31

Accepted Solution

by:
Helen Feddema earned 1000 total points
ID: 39249269
Make it a multi-select listbox and use code like the following:

Private Sub cmdProcessListboxItems_Click()

On Error GoTo ErrorHandler

   Dim lst As Access.ListBox
   Dim strData As String
   Dim strPrompt As String
   Dim strTest As String
   Dim strTitle As String
   Dim varItem As Variant
   
   Set lst = Me![lstSelectContacts]
      
   'Check that at least one item has been selected
   If lst.ItemsSelected.Count = 0 Then
      strTitle = "No items selected"
      strPrompt = "Please select at least one item"
      MsgBox prompt:=strPrompt, _
         buttons:=vbInformation + vbOKOnly, _
         Title:=strTitle
      lst.SetFocus
      GoTo ErrorHandlerExit
   End If
   
   strTitle = "Information missing"
   
   'Test for required information, using listbox columns
   For Each varItem In lst.ItemsSelected
      'Check for required address information (or whatever you need to check)
      strTest = Nz(lst.Column(5, varItem))
      Debug.Print "Street address: " & strTest
      If strTest = "" Then
         strPrompt = "Skipping this record -- no street address!"
         MsgBox prompt:=strPrompt, _
            buttons:=vbExclamation + vbOKOnly, _
            Title:=strTitle
         GoTo NextItem
      End If
      
      'Do something with info from the listbox columns, using
      'this syntax
      strData = Nz(lst.Column(5, varItem))
      
NextItem:
   Next varItem

ErrorHandlerExit:
   Exit Sub

ErrorHandler:
   MsgBox "Error No: " & Err.Number _
      & "; Description: " & Err.Description
   Resume ErrorHandlerExit

End Sub

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LVL 31

Expert Comment

by:Helen Feddema
ID: 39249273
I think it is unwise to assume that if nothing is selected, everything should be processed.  For listboxes with many items, I usually add two buttons, one for selecting everything and one for deselecting everything.  This is safer.  Here is the code for selecting all -- for deselecting, change True to False:

Set lst = Me![lstSelectMultiple]
intRows = lst.ListCount - 1

For intIndex = 0 To intRows
   lst.Selected(intIndex) = True
Next intIndex

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