ACC2000: How to Dynamically Unlock a Control with a Message Box

ID: Q200550

The information in this article applies to:

Microsoft Access 2000

Advanced: Requires expert coding, interoperability, and multiuser skills.

SUMMARY

To protect the data in a control on a form from accidentally being changed, you can use a message box to prompt for verification when you try to enter data into that control. Clicking Yes in the message box unlocks the control, and allows you to type.

MORE INFORMATION

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The following example displays a message box to verify that the user wants to update the Description text box in the Categories form in Northwind.mdb.

CAUTION: Following the steps in this example will modify the sample database Northwind.mdb. You may want to back up the Northwind.mdb file and perform these steps on a copy of the database.

Start Microsoft Access, and open the sample database Northwind.mdb.

Open the Categories form in Design view.

Click Code on the View menu, and type the following line in the Declarations section:


Public fEditDescription As Boolean

Set the OnCurrent property of the form to the following event procedure:


Private Sub Form_Current()

   ' Lock the Description control for each record.
   Me!Description.Locked = True
   fEditDescription = False

End Sub

Open the property sheet of the Description text box, and change the Locked property to Yes.

Set the OnKeyDown property of the Description text box to the following event procedure:


Private Sub Description_KeyDown(KeyCode As Integer, _
   Shift As Integer)

   ' If the field is not flagged for editing, prompt the user
   ' for confirmation about unlocking the control.
   If fEditDescription = False Then
      If MsgBox("Do you want to change Description?", _
            vbYesNo + vbQuestion + vbDefaultButton2, _
            "Confirmation") = vbYes Then

         ' If the response is Yes, unlock the field
         ' and flag it as being edited.
         Me!Description.Locked = False
         fEditDescription = True
      End If
   End If

End Sub

Switch to Form view and try to change the contents of the Description text box.

Note that a message box appears and asks whether you want to change Description. If you click Yes, Description is unlocked and you can edit its contents for that particular record. If you click No, Description remains locked.

REFERENCES

For more information about the MsgBox() Function, click Microsoft Access Help on the Help menu, type "MsgBox Function example" in the Office Assistant or the Answer Wizard, and then click Search to view the topics returned.

Additional query words: dialog confirm

Keywords : kbprg kbdta AccCon KbVBA
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbinfo