Knowledge Management

Question:
Hi,
How can you put a popup screen when you click on the "back" arrow for an ALV report to say "Save before leaving"?
I know that to activate the save function in alv, you have to use the function '&DATA_SAVE' in your program.
But the "Back" arrow is already activated. I just need to implement the popup screen before it goes to the previous screen.
Thanks very much,
Shae
Answer:
Here is some code for an ALV Grid control.
In the variable "changed" we keep whether the data in the control has changed.
We also use the event "data_changed".
I hope that i helped you a little.
PS take a look at this address

DATA: event_receiver TYPE REF TO lcl_event_receiver,
g_container TYPE scrfname VALUE 'MY_CONTAINER',
grid1 TYPE REF TO cl_gui_alv_grid,
g_custom_container TYPE REF TO cl_gui_custom_container,
changed type c.
...
...
...
*---------------------------------------------------------------------*
* CLASS lcl_event_receiver DEFINITION
*---------------------------------------------------------------------*
* ........ *
*---------------------------------------------------------------------*
CLASS lcl_event_receiver DEFINITION.
PUBLIC SECTION.
METHODS handle_data_changed
FOR EVENT data_changed OF cl_gui_alv_grid
IMPORTING er_data_changed.
ENDCLASS.
*---------------------------------------------------------------------*
* CLASS lcl_event_receiver IMPLEMENTATION
*---------------------------------------------------------------------*
* ........ *
*---------------------------------------------------------------------*
CLASS lcl_event_receiver IMPLEMENTATION.
METHOD handle_data_changed.
PERFORM data_changed USING er_data_changed.
ENDMETHOD.
ENDCLASS.
...
...
...
* Create the objects for the container and the ALV control
CREATE OBJECT g_custom_container
EXPORTING container_name = g_container.
CREATE OBJECT grid1
EXPORTING i_parent = g_custom_container.
* Create the object for event reciver and register the handler method
* for this object when data changes or a button pressed
CREATE OBJECT event_receiver.
SET HANDLER event_receiver->handle_data_changed FOR grid1.
* Call method of grid to register event ENTER in ALV control
CALL METHOD grid1->register_edit_event EXPORTING
i_event_id = cl_gui_alv_grid=>mc_evt_enter.
...
...
...
*&---------------------------------------------------------------------*
*& Form data_changed
*&---------------------------------------------------------------------*
FORM data_changed USING rr_data_changed TYPE REF TO
cl_alv_changed_data_protocol.
...
...
...
changed = 'X'.
...
...
...
ENDFORM. " data_changed
Answer:
Thank you very much, but is there no way of doing it using the CALLBACK_USER_COMMAND or the CALLBACK_PF_STATUS_SET forms?