Allow data entry or editing on certain period of time otherwise lock the form for data view alone.  The reason to do this may be for time-bound work schedules or some other reason.  Request for a solution to this kind of  action was raised in a Microsoft Access Discussion Forum on the web and I thought I will give it a try and written a program to enable the form for Data Entry/Edit between 06:00 to 07:00 Hours, 11:00 to 13:00 Hours and 17:00 to 19:00 Hours otherwise disable the form and allow only data view mode.

The function written for this task is given below can be copied to a Standard Module:

Public Function Data_Entry(ByVal frmName As String)
Dim T1S, T1E, T2S, T2E, T3S, T3E
Dim frm As Form

Set frm = Forms(frmName)

D = Date
T1S = TimeValue("06:00:00")
T1E = TimeValue("07:00:00")

T2S = TimeValue("11:00:00")
T2E = TimeValue("13:00:00")

T3S = TimeValue("17:00:00")
T3E = TimeValue("19:00:00")

Select Case time
      Case T1S To T1E, T2S To T2E, T3S To T3E
          With frm
            If .AllowAdditions = False Then
               .AllowAdditions = True
               .AllowEdits = True
               .lblMsg.Visible = False
'change .subFrmName to match the control (window) name of the sub-form
               .subFrmName.Enabled = True
            End If
          End With
          frm.Refresh
      Case Else
          With frm
            If .AllowAdditions = True Then
                .AllowAdditions = False
                .AllowEdits = False
                .lblMsg.Visible = True
 'change the next line to set focus on any field on the main form
                .EmployeeID.SetFocus
'change .subFrmName to match the control (window) name of the sub-form
                .subFrmName.Enabled = False
            End If
          End With
          frm.Refresh
End Select

Set frm = Nothing
End Function

NB: You must make changes wherever applicable to point the code to correct control names on your Form, which I have marked with comments.

  1. Open your Form in Design View.
  2. Add a Label Control on the main Form where you want to display ‘Entry not allowed‘, change the Name property value to lblMsg and write the message in the Caption property.
  3. Display the Form Property Sheet.
  4. Set Timer Interval value to 60000 (i.e. 1 minute).  The Form’s current mode is checked in one minute interval apply changes automatically.  You may increase the time interval by adding 1000 to the above value for each second increase.
  5. Select On timer Event, select [Event Procedure] from the drop-down control and click on the build ( . . .) button to open the VBA module.
  6. Copy and Paste the following lines of Code replacing the existing two lines displayed there:

    Code:

    Private Sub Form_Timer()
       Data_Entry Me.Name
    End Sub
  7. Save and Close the Form.

The Timer setting will run the above program and will check every minute, whether the current time falls within the time slots given in the program, if true then the Main-form and a Sub-Form on the main form will be enabled for Editing/Entry purposes, otherwise they will be locked.

 
When you open the Form there will be a one minute delay before Access starts checking. You may call the Data_Entry() function from the Form_Current() event procedure to start checking immediately after opening to avoid the one minute initial delay.