The information in this article applies to:
- Microsoft Access versions 2.0, 7.0, 97
SUMMARY
Advanced: Requires expert coding, interoperability, and multiuser skills.
This article demonstrates how you can remove an entry from a list box
or combo box after you have selected that entry. This technique uses
a parameter query to delete the selected entry from the underlying
recordset and then requeries the list box to update the list. This is
useful in situations in which, once an item has been selected, that item
cannot be selected again.
This technique is not useful for large lists (more than 1000 items),
because it would take too long to requery the list.
This article assumes that you are familiar with Visual Basic for
Applications and with creating Microsoft Access applications using the
programming tools provided with Microsoft Access. For more information
about Visual Basic for Applications, please refer to your version of the
"Building Applications with Microsoft Access" manual.
NOTE: Visual Basic for Applications is called Access Basic in Microsoft
Access version 2.0. For more information about Access Basic, please refer
to the "Building Applications" manual.
MORE INFORMATION
To create a list box whose items are deleted from the list box list after
they have been selected, follow these steps:
- Open the sample database Northwind.mdb (or NWIND.MDB in version 2.0)
and create the following query based on the Customers table:
Query: ListTemp
----------------------
Type: Make Table Query
Field: Country
Table: Customers
Total: Group By
You can start by creating a regular select query, adding the Customers
table, and including only the Country field. Then, on the View menu,
click Totals. Leave the Totals row as Group By. Then, on the Query menu,
click Make Table.
Specify ListTemp as the Table Name in the Make Table dialog box.
- Run the MakeListTemp query to create the ListTemp table.
- Create the following query based on the Customers table:
Query: AppendListTemp
---------------------
Type: Append Query
Field: Country
Table: Customers
Total: Group By
Sort: Ascending
Append To: Country
Specify ListTemp as the Table Name in the Append dialog box.
- Create the following query based on the ListTemp table:
Query: DeleteListTemp
---------------------
Type: Delete Query
Field: Country
Table: ListTemp
Delete: Where
- Create the following form not based on any table or query:
Form: Test
-----------------------------
Caption: TestForm
List box:
Name: ShrinkingList
RowSourceType: Table/Query
RowSource: ListTemp
ColumnCount: 1
- Set the Test form's OnOpen property to the following event procedure:
Private Sub Form_Open(Cancel As Integer)
Dim db As DATABASE
Dim qy As QueryDef
Set db = CurrentDb()
Set qy = db.QueryDefs("DeleteListTemp")
qy.Execute
Set qy = db.QueryDefs("AppendListTemp")
qy.Execute
qy.Close
End Sub
NOTE: In Microsoft Access version 2.0, omit the "Private" keyword. In
that version Private is not valid for Sub procedures.
- Set the Test form's OnLoad property to the following event procedure:
Private Sub Form_Load()
Me!ShrinkingList.Requery
End Sub
- Set the ShrinkingList list box's AfterUpdate property to the following
event procedure.
NOTE: In the following sample code, an underscore (_) at the end of a
line is used as a line-continuation character. Remove the underscore
from the end of the line when re-creating this code in Access Basic.
Private Sub ShrinkingList_AfterUpdate ()
On Local Error GoTo ShrinkingList_AfterUpdate_Err
'NOTE: In Microsoft Access version 2.0, omit the Private keyword for the
'Sub statement and the Local keyword for the On Error sentence. In
'version 2.0, those keywords are not valid for these statements.
Dim db As Database, rs As Recordset, criteria As String
Dim UserMessage As String
Set db = CurrentDB()
' Create recordset based on the list box RowSource.
Set rs = db.OpenRecordset(Me!ShrinkingList.RowSource, _
DB_OPEN_DYNASET)
' Check for the existence of Null values.
If IsNull(Me!ShrinkingList) Then
MsgBox "Shrinking List is Null!"
Exit Sub
End If
UserMessage = Me!ShrinkingList
criteria = "[Country] = '" & Me!ShrinkingList & "'"
' Locate the record that was selected in the list box
' list and delete it.
rs.FindFirst criteria
rs.Delete
' Refresh the List Box's RowSource property entries.
Me!ShrinkingList.Requery
' Set the contents of the List Box to blank.
Me!ShrinkingList = Null
' Prompt user.
MsgBox "The Item " & UserMessage & " has been deleted!"
Exit Sub
ShrinkingList_AfterUpdate_Err:
MsgBox Error$
Exit Sub
End Sub
NOTE: The FindFirst criteria can be based on any column of the
list box. If the list box column is not the column set in the
BoundColumn property, change the criteria's list box reference to
ShrinkingList.Column(n), where (n) is the column's zero-based ordinal
position in the RowSource property field list.
- Save the Test form and view it in Form view. Click any element
in the list box to delete it. Note that a message appears that states
that the item you selected was deleted.
REFERENCES
For more information about list box properties, search the Help Index for
"List Boxes, properties," or "List box: properties" or ask the Microsoft
Access 97 Office Assistant.
Keywords : kbprg PgmHowTo FmsCmbo
Version : 2.0 7.0 97
Platform : WINDOWS
Hardware : x86
Issue type : kbhowto