ALV Grid editable - How to raise the data_changed event from outside object

Question

Hi,
i'd like to like to raise the data_changed event from outside the ALV-Grid object in order to display errors to the user.
For example a new row was inserted within the program. The user has only to complete the missing informations. Before saving the transactions the program has to execute some semantic checks. The errors of this check process should be shown to the user by creating an instance of the cl_alv_changed_data_portocol object.
Thanks.
Regards

Answer 1

You don't need to raise the data_changed event to perform the edits or to issue messages using cl_alv_changed_data_protocol.
The following assumes you have an ALV grid object g_alv based on the CL_GUI_ALV_GRID class.
You can mark the inserted records upon insertion as selected using the set_selected_rows method, and then retrieve these rows later using get_selected_rows and perform necessary edits.
Save the row number of each inserted row into a table of the appropriate type (see the method definition for this):
DATA: t_index_rows    TYPE  lvc_t_row.
DATA: s_row_no        TYPE  lvc_s_roid.
DATA: t_row_no        TYPE  lvc_t_roid.
Load entries into t_row_no after each insert.  Capture the row number and save in the table t_row_no.
e.g.
PERFORM insert_row USING s_row_no-row_id.
APPEND s_row_no TO t_row_no.
FORM insert_row would have whatever code you are using to insert the row.  Save the row id into s_row_no-row_id (which is an INT4).
When done with all inserts do the following
  IF t_row_no[] IS NOT INITIAL.
    CALL METHOD g_alv->set_selected_rows
      EXPORTING
        it_index_rows            = t_index_rows
        it_row_no                = t_row_no
        is_keep_other_selections = 'X'.
  ENDIF.
Then, if SAVE is pressed without the data_changed event having been raised (such as if the user just pressed SAVE without changing anything), use method get_selected_rows to retrieve the rows that were inserted and perform the necessary edits.
  DATA: l_t_rows    TYPE lvc_t_row.              " ALV control: Table rows
  CALL METHOD g_alv->get_selected_rows
    IMPORTING
      et_index_rows = l_t_rows.
Loop through l_t_rows and use the row as an index into the grid, perform the necessary edits, just as you would if the data_changed event had been raised.
If any edits fail, then send messages to the user, abort the save, and re-display the grid.
Remember to refresh the t_row_no and t_index_rows tables if you load a new data set.
You can also use a similar technique with the data_changed event to mark each changed row as selected by saving the row ids, and then you only have to update the changed rows on SAVE, which can minimize database I/O.
Good luck.
Brian