How to retrieve the selected items in a multiple selection List Box as a comma-delimited string in Microsoft Access
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This article applies to either a Microsoft Access database (.mdb) file or to a Microsoft Access database (.accdb) file, and to a Microsoft Access project (.adp) file.
Moderate: Requires basic macro, coding, and interoperability skills.
This article describes how to retrieve selected items from a multiple selection list box and then store the selected items as a comma-delimited string in Microsoft Access.
In Microsoft Access, the value of the MultiSelect property of the list box in a form or in a report determines whether the list box is a single selection list box or a multiple selection list box. In a multiple selection list box, you can select multiple list items at one time.
You can use the Value property of the list box to retrieve the selected item from the list box. However, when you use a multiple selection list box and you try to retrieve the selected items by using the Value property, the Value property returns Null.
You can retrieve the selected items in a multiple selection list box and then store the selected items as a comma-delimited string programmatically. To do this, follow these steps:
Start Microsoft Access.
Open the Northwind sample database.
In the Objects section of the Database window, click Forms.
Note In Access 2007, click Form Design in the Forms group on the Create tab.
In the right pane, double-click Create form in Design view.
Note In Access 2007, skip this step.
Add the following controls to the form, and then set the properties of controls as specified:
List Box ---------------------------------------------------- Name : NamesList Row Source Type : Table/Query Row Source : SELECT First Name FROM Employees Multi Select : Extended Width : 3.5" Height : 0.75" Text Box ----------------------- Name : mySelections Width : 3.5" Height : 0.25" Command Button ---------------------------------- Name : testmultiselect Caption : Display Selected Items Width : 1.375" Height : 0.3" Command Button ---------------------- Name : ClrList Caption : Clear List Width : 1.375" Height : 0.3"
On the View menu, click Code.
Note In Access 2007, click View Code in the Tools group on the Design tab.
Paste the following code in the Visual Basic Editor:
Option Compare Database Option Explicit Private Sub Form_Current() Dim oItem As Variant Dim bFound As Boolean Dim sTemp As String Dim sValue As String Dim sChar As String Dim iCount As Integer Dim iListItemsCount As Integer sTemp = Nz(Me!mySelections.Value, " ") iListItemsCount = 0 bFound = False iCount = 0 Call clearListBox For iCount = 1 To Len(sTemp) + 1 sChar = Mid(sTemp, iCount, 1) If StrComp(sChar, ",") = 0 Or iCount = Len(sTemp) + 1 Then bFound = False Do If StrComp(Trim(Me!NamesList.ItemData(iListItemsCount)), Trim(sValue)) = 0 Then Me!NamesList.Selected(iListItemsCount) = True bFound = True End If iListItemsCount = iListItemsCount + 1 Loop Until bFound = True Or iListItemsCount = Me!NamesList.ListCount sValue = "" Else sValue = sValue & sChar End If Next iCount End Sub Private Sub clearListBox() Dim iCount As Integer For iCount = 0 To Me!NamesList.ListCount Me!NamesList.Selected(iCount) = False Next iCount End Sub Private Sub testmultiselect_Click() Dim oItem As Variant Dim sTemp As String Dim iCount As Integer iCount = 0 If Me!NamesList.ItemsSelected.Count <> 0 Then For Each oItem In Me!NamesList.ItemsSelected If iCount = 0 Then sTemp = sTemp & Me!NamesList.ItemData(oItem) iCount = iCount + 1 Else sTemp = sTemp & "," & Me!NamesList.ItemData(oItem) iCount = iCount + 1 End If Next oItem Else MsgBox "Nothing was selected from the list", vbInformation Exit Sub 'Nothing was selected End If Me!mySelections.Value = sTemp End Sub Private Sub clrList_Click() Call clearListBox Me!mySelections.Value = Null End Sub
Close the Visual Basic Editor.
Save the form as Form1.
Close the form.
Open the Form1 form in Form view:
In the Objects section of the Database Window, click Forms.
Note In Access 2007, in the navigation pane, click the Forms group.
In the right pane, right-click Form1, and then click Open.
Note In Access 2007, right-click Form1, and then click Open.
Select multiple items in the list box. To do this, click an item in the list box, hold down the CTRL key, and then click more items in the list box.
Click Display Selected Items.
The items that are selected from the multiple selection list box are displayed as a comma-delimited string in the text box.
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