How To Create a PageFrame Parameterized View

MORE INFORMATION

1. Create the following Views in Vpf\Samples\Mainsamp\Data\Tastrade.dbc database in Visual FoxPro 6.0, the sample path is under _samples+"Testrade\data":
   
   NOTE: When you create the local view in the View Designer, set the parameter in the SELECT statement to the List Value property, as in the following SELECT statements. For example in the View Designer for List2, place "city" in the Selected Output field, "country" in the Field Name field, and ?ThisForm.PageFrame1.Page1.List1.Value in the Example field.
   
   View List2:

         SELECT customer.city FROM tastrade!customer ;
            WHERE customer.country = ?ThisForm.PageFrame1.Page1.List1.Value
   						

   View List3:

         SELECT customer.company_name FROM tastrade!customer ;
            WHERE customer.city = ?ThisForm.PageFrame1.Page2.List1.Value
   						

   View List4:

         SELECT customer.customer_id FROM tastrade!customer WHERE ;
            customer.company_name = ?ThisForm.PageFrame1.Page3.List1.Value
   						

2. On a Form, place a PageFrame with 4 Pages and a ListBox on each Page. Establish the following methods and properties for the Form and PageFrame Pages:
   
   
   1. In the Init event of the form:

            This.DataEnvironment.OpenTables
      
            This.PageFrame1.Page2.List1.RowSource='List2'
            This.PageFrame1.Page2.List1.RowSourceType=2
      
            This.PageFrame1.Page3.List1.RowSource='List3'
            This.PageFrame1.Page3.List1.RowSourceType=2
      
            This.PageFrame1.Page4.List1.RowSource='List4'
            This.PageFrame1.Page4.List1.RowSourceType=2
      								

   2. On the Property Sheet for Page1.List1:
      
      Page1.List1.RowSource

               SELECT distinct Country from Customer into Cursor abc
      								

      Page1.List1.RowSourceType

               3 - SQL Statement
      								

   3. In the InterActiveChange event for Page 1.List1:

            *This is for the List on Page 1
      
            = REQUERY("List2")
      
            ThisForm.PageFrame1.Page2.List1.RowSource='List2'
            ThisForm.PageFrame1.Page2.List1.RowSourceType=2
            ThisForm.PageFrame1.Page2.List1.requery( )
      								

   4. In the Page2.List1.LostFocus event:
      
      NOTE: The Help file recommends that the following code be placed in the InterActiveChange method but testing has shown that if there is only one selection available beyond Page1, the subsequent Lists are not updated.

            *This is for the ListBox on Page 2
            = REQUERY("List3")
      
            ThisForm.PageFrame1.Page3.List1.RowSource='List3'
            ThisForm.PageFrame1.Page3.List1.RowSourceType=2
            ThisForm.PageFrame1.Page3.List1.requery( )
      								

   5. In the Page3.List1.LostFocus event:

            *This is for the ListBox on Page 3
      
            = REQUERY("List4")
      
            ThisForm.PageFrame1.Page4.List1.RowSource='List4'
            ThisForm.PageFrame1.Page4.List1.RowSourceType=2
            ThisForm.PageFrame1.Page4.List1.Requery( )
      								

3. Create a DataEnvironment for the form.
   
   
   1. Include the following table and views from the TASTRADE.DBC:

            1. Customer table
            2. View List2
            3. View List 3
            4. View List 4
      								

   2. Set the DataEnvironment.AutoOpenTables property to false (.F.).