PRB: Data Not Updated with ToolBar Navigation

MORE INFORMATION

1. Define a ToolBar class and a custom Navigation class by adding the following code to a Visual FoxPro program file, saved as Tbnav.prg:

             ****************************************************************
         **** Top of Sample Code for ToolBar and Navigation Class ****
         **** Tbnav.prg ****
   
         ** Define the toolbar class. **
         DEFINE CLASS skipbar AS toolbar
            Caption = "SkipBar"
            Height = 40
            Left = 0
            Top = 0
            Width = 181
            Name = "skipbar"
            oform = .F.  && Will hold reference of calling object.
            ADD OBJECT cmdprev AS commandbutton WITH ;
               Top = 5, ;
               Left = 5, ;
               Height = 31, ;
               Width = 86, ;
               Caption = "Prev", ;
               Name = "cmdPrev"
            ADD OBJECT cmdnext AS commandbutton WITH ;
               Top = 5, ;
               Left = 90, ;
               Height = 31, ;
               Width = 86, ;
               Caption = "Next", ;
               Name = "cmdNext"
            PROCEDURE Init
               LPARAMETERS toForm  && Get the calling objects reference.
               THIS.oForm = toForm
            ENDPROC
            PROCEDURE cmdnext.Click
               THIS.Parent.oForm.oNav.pNext() && Call pNext in Navigation.
               THIS.Parent.oForm.Refresh()
            ENDPROC
            PROCEDURE cmdprev.Click
               THIS.Parent.oForm.oNav.pPrev() && Call pPrev in Navigation.
               THIS.Parent.oForm.Refresh()
            ENDPROC
         ENDDEFINE
   
         ** Define the custom navigation class. **
         DEFINE CLASS navigation AS custom
            Name = "navigation"
            nskiptable = .F.
            PROCEDURE pNext
               SELECT (THIS.nSkipTable)
               SKIP
               IF EOF() THEN
                  SKIP -1
               ENDIF
            ENDPROC
            PROCEDURE pPrev
               SELECT (THIS.nSkipTable)
               SKIP -1
               IF BOF() THEN
                  SKIP
               ENDIF
            ENDPROC
            PROCEDURE first
               SELECT THIS.nSkipTable
               GO TOP
            ENDPROC
            PROCEDURE last
               SELECT THIS.nSkipTable
               GO BOTTOM
            ENDPROC
            PROCEDURE Init
               THIS.nSkipTable = SELECT(0)
            ENDPROC
         ENDDEFINE
         **** Bottom of Sample Code for ToolBar and Navigation Class ****
         ****************************************************************

2. Create and populate a table using the following code:

         CREATE TABLE customer (cust_id c(5), contact c(5))
         INSERT INTO customer VALUES ("AAAAA","A1A1A")
         INSERT INTO customer VALUES ("BBBBB","B1B1B")
         INSERT INTO customer VALUES ("CCCCC","C1C1C")
         INSERT INTO customer VALUES ("DDDDD","D1D1D")
         INSERT INTO customer VALUES ("EEEEE","E1E1E")
         INSERT INTO customer VALUES ("FFFFF","F1F1F")

3. Create a Form and add the table to its Data Environment.
4. Drag and drop each of the fields separately to create text box controls.
5. Add two custom properties to the form, oSkipBar and oNav. These properties hold the references of the SkipBar and Navigation objects respectively.
6. Place the following code in the INIT event of the form:

         **Specify file that contains SkipBar and Navigation Class
           Definitions
   
         SET PROCEDURE TO Tbnav.prg
   
         **Create SkipBar and pass current Forms reference to it.
         **Creat SkipBar object, save reference to Form's oSkipBar property.
         THIS.oSkipBar = CREATEOBJECT('SkipBar', THIS)
         THIS.oSkipBar.Visible = .T.
   
         **Creat Navigation object, save reference to Form's oSkipBar
             property
         THIS.oNav = CREATEOBJECT('navigation')

7. Run the form and change the text displayed in one of the text boxes.
8. Click the Next button on the toolbar to go to the next record.
9. Click the Prev button on the toolbar to return to the previous record.
   
   NOTE: The changes that you had made to the data are not saved.
10. Change the text displayed in one of the text boxes and press ENTER.
11. Repeat steps 9 and 10 and note that the changes are saved.

To fix the problem add the following lines of code to the beginning of the cmdnext.click and cmdprev.click procedures of the Skipbar class:

   tmpAC =  THIS.Parent.oForm.ActiveControl
   tmpAC.Value = tmpAc.Text
				

Make sure that the above two lines are the first two in the procedures.

Now, the changes are saved when the record pointer is moved using the navigation buttons in the ToolBar, whether the ENTER key is pressed or not.