ACC2: Using Code to Dynamically Synchronize Two Forms

MORE INFORMATION

The following example demonstrates how to synchronize the Products form to the current record in the Categories Subform form in the sample database NWIND.MDB.

CAUTION: Following the steps in this example will modify the sample database NWIND.MDB. You may want to back up the NWIND.MDB file, or perform these steps on a copy of the NWIND database.

1. Open the NWIND database.
2. Open the Categories Subform form in Design view.
3. Set the form's OnCurrent property to the following event procedure:
   

         '**********************************************************
         'Sub Form_Current()
         '**********************************************************
   
             'If the Product ID is blank, then exit the Sub.
             If IsNull(Me![Product Id]) Then
                 Exit Sub
             End If
   
             'Dimension variables.
             Dim formname As String, SyncCriteria As String
             Dim f As Form, rs As Recordset
   
             'Set the formname to "Products," the form that will be
             'synchronized.
             formname = "Products"
   
             'Check to see if the Products form is open. If it
             'is not open, open it.
             If Not SysCmd(SYSCMD_GETOBJECTSTATE, A_FORM, formname) Then
                 DoCmd OpenForm formname
             End If
   
             'Define the form object and Recordset object for
             'the Products form.
             Set f = Forms(formname)
             Set rs = f.RecordsetClone
   
             'Define the criteria used for the synchronization.
             SyncCriteria = "[Product Id]=" & Me![Product Id]
   
             'Find the corresponding record in the Products form to
             'the current record in the subform.
             rs.FindFirst SyncCriteria
   
             'If a record exists in the Products form, find the
             'matching record.
             If rs.nomatch Then
                 MsgBox "No match exists!", 64, formname
             Else
                 f.bookmark = rs.bookmark
             End If
   
         '**********************************************************
         'End Sub
         '**********************************************************
   						

4. Save and then close the Categories Subform form.
5. Open the Categories form in Form view. When you open the Categories form, the subform's OnCurrent event procedure will be triggered, causing the Products form to be opened if it is not already open.

You can adapt this method to occur when a command button is clicked by moving the code specified in the subform's OnCurrent property event procedure to a command button on the Categories form. If you do move the code to a command button, make sure to change the references to "Me" in the code to full form reference, using the syntax:

   Forms!Categories![Categories Subform].Form