CL_GUI_ALV_GRID check changed data not triggering event handler method

[Former Member]

Halo Experts,

There is a method in my class has_data_changed( ) which asks the Grid whether any data has been chnaged so that I can update my delta tables

inside the method has_data_changed( ) I am calling

l_grid->check_changed_data( IMPORTING e_valid = l_valid ) and I have got a event handler method in the same class for event data change of GRID .

But sometimes the check_changed_data is not triggering the event handler method . I dont know what exactly is the problem .

I am setting the handlers also correctly. Could you please help.

Moderator message - Moved to the correct forum

Edited by: Rob Burbank on Nov 6, 2009 11:07 AM

[Former Member]

Can you please check if u changed system events to application events ...in that case u need to call CL_GUI_CFW=>DISPATCH in the PAI module.

[Former Member]

Thanks

I checked in the constrcutor of ALV_GRID i changed i_appl_events = 'X' to space . Still the event handler is not getting triggered.

One more thing I noticed , I have some fields registered for event on_f4 ie

l_f4-fieldname = 'ID'.

l_f4-register = 'X'.

l_f4-GETBEFORE = 'X'.

l_f4-CHNGEAFTER = 'X'.

INSERT l_f4 INTO TABLE lt_f4.

But when I go to change mode for this field and press f4 the event handler for data_changed is getting triggered ,but when i change the data and press save ( where I am calling l_grid->check_changed_data) the event is not getting triggered.It even does not go inside the std sap code.

Now when I modify a field which is not registered for f4 and press save the event is getting triggered.

[Former Member]

did u try to use

SET_REGISTERED_EVENTS method to register the event

and try

CALL METHOD g_grid->register_edit_event

EXPORTING

i_event_id = cl_gui_alv_grid=>mc_evt_modified.

Edited by: rajesh khatwa on Nov 6, 2009 6:12 PM

[Former Member]

Ya I have used that also but still the event inside save method( where I call l_gird->check_changed_data( ) is not getting triggered ), if the last edited field in my grid is a field that is registered for f4 event.

[uwe_schieferstein]

Hello

You may have a look at thread

and the blog [A Christmas Collection of Useful Classes|http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/12377] [original link is broken] [original link is broken] [original link is broken];

I am almost sure that the problem is due to a "misplacement" (i.e. wrong timing) of the method call CHECK_DATA_CHANGED.

Regards

Uwe

PS: Without parts of the coding where one can see the flow of the program it is not possible to give more concrete advice.

[Former Member]

Halo Uwe,

Thanks a lot ,But i did not get my reqd answer .

in my event handler method on_data_changed I want to update my delta tables

my_new_and_changed_records( which consists of newly added records as well as changed records ) .

and also my_deleted_records( which consists of deleted records ). ie the user has freedom to do anything in the Grid.Inside on_data_changed i am getting all the updated records , modifed cells . deleted rows in to my local class attributes . Then I am using that to fill my delta tables . I am making sure that only when user presses save I am updating the delta recods( my_new_and_changed_records

and my_deleted_records)

  DATA l_record TYPE t_record.
  DATA l_display_record LIKE LINE OF my_display_records.
  DATA: l_modified_cell TYPE lvc_s_modi.
  FIELD-SYMBOLS : <fs_field_value> TYPE ANY.
 
IF i_data_changed IS BOUND.
    APPEND LINES OF i_data_changed->mt_mod_cells TO my_modified_cells.
    APPEND LINES OF i_data_changed->mt_inserted_rows TO my_inserted_rows.
    APPEND LINES OF i_data_changed->mt_deleted_rows TO my_deleted_rows.
  ENDIF.


if my_save_flag eq 'X'.  
LOOP AT my_modified_cells INTO l_modified_cell
                        WHERE value IS NOT INITIAL
                        AND error NE 'X'.
* Mae sure that it is not Inserted rows whihc is handled separately
    READ TABLE my_inserted_rows WITH KEY row_id = l_modified_cell-row_id TRANSPORTING NO FIELDS.

    IF sy-subrc NE 0.

      READ TABLE my_display_records  INDEX l_modified_cell-row_id INTO l_display_record.

      IF l_display_record IS NOT INITIAL.

        ASSIGN COMPONENT l_modified_cell-fieldname OF   STRUCTURE l_display_record TO <fs_field_value>.

        <fs_field_value> = l_modified_cell-value.

        MOVE-CORRESPONDING l_display_record TO l_record.

        READ TABLE my_new_and_changed_records WITH KEY id = l_record-id
                                                       valid_from = l_record-valid_from
                                                       valid_to = l_record-valid_to
                 TRANSPORTING NO FIELDS.

        IF sy-subrc EQ 0.
          MODIFY my_new_and_changed_records FROM l_record INDEX sy-tabix.
        ELSE.
          APPEND l_record TO my_new_and_changed_records.
        ENDIF.

      ENDIF.

    ENDIF.

    CLEAR: l_display_record,
            l_record.


  ENDLOOP.
************************Modification Operation ends*********************

**************************Insert operation*********************************

LOOP AT my_inserted_rows INTO l_inserted_row.

      READ TABLE my_deleted_rows WITH KEY row_id = l_inserted_row-row_id
      TRANSPORTING NO FIELDS.

      IF sy-subrc NE 0.

        IF i_data_changed IS BOUND.

          l_record = get_cell_values( i_row_id = l_inserted_row-row_id
                                   i_data_changed = i_data_changed ).

        ELSE.

          READ TABLE my_display_records  INDEX l_inserted_row-row_id INTO l_display_record.

          MOVE-CORRESPONDING l_display_record TO l_record.

        ENDIF.

        IF l_record IS NOT INITIAL.

          APPEND l_record TO my_new_and_changed_records.

        ENDIF.

      ENDIF.

    ENDLOOP.
*************End of Insert operation*****************

Now here I have two problems

1 I am explicitly calling on_data_change event handler method in my save bcs l_grid->check_changed_data is not working fine .

Is htere any way to find l_grid->check_changed_data is triggered or not

2 I am having a problem with the combination of deelted rows and inserted rows . If the user deletes

the first row in my_display_records and then inserts a new one . He presses save , then both the row ids in my_inserted_row as well as my_deleted_row are one. How to differentiate b/w/ this two what the user did first?

[uwe_schieferstein]

Hello Arshad

In my opinion your approach is much too complicated. Instead of trying to collect all the changes during the editing process by the user I would recommend a much simpler way:

1. Before displaying your ALV list store a PBO image of your data

DATA:
  gt_outtab            TYPE ty_t_outtab,
  gt_outtab_pbo    TYPE ty_t_outtab.
...

gt_outtab_pbo = gt_outtab.
...
CALL METHOD go_grid->SET_TABLE_FOR_FIRST_DISPLAY(...). 

2. When the user pushes the SAVE button compare the PAI vs PBO data, e.g.:

[Comparing Two Internal Tables - A Generic Approach|http://wiki.sdn.sap.com/wiki/display/Snippets/ComparingTwoInternalTables-AGeneric+Approach]

3. Update the PBO data after saving the data:

gt_outtab_pbo = gt_outtab.

Regards

Uwe

[Former Member]

Hi Uwe ,

Thanks for the reply .

I changed the coding only to see that this compare method does not work for global structures and global table types with line type structures .

I am not displaying the table as such in the grid , I am showing a global structure with different fields ( compared to the global table ).

*It is catching the exception name_tab error inside

FM CHANGEDOCUMENT_PREPARE_TABLES*

Now I have to write back the display records in PBO and PAI to the table records and do the compare I suppose : (