topic Re: ALV Tree-Problem in Application Development and Automation Discussions

ALV Tree-Problem

Former Member — Fri, 28 Dec 2007 12:52:12 GMT

Hi ,

I new to ALV tree. There is an Tree ALV displayed in the output. Behind the node there is a check box for each node and also for the each line item of that node. when the user click on the check box of that node all the lineitem of that particular node need to checked and all the line item data has to be captureed. I have added the check box behind the node as well as line item of that node. when user select the node

how the line item will be selected automatically and how do i capture that selected line item, Please suggest me or send me some sample of code.

emmidiate help will be appreciated.

Regards,

Priyaranjan

Re: ALV Tree-Problem

uwe_schieferstein — Fri, 28 Dec 2007 21:07:15 GMT

Hello Priyaranjan

The following coding was used in a modified version of sample report BCALV_TREE_DEMO where I added a checkbox to each displayed line in the ALV tree.

The event handler method HANDLE_CHECKBOX_CHANGE (event CHECKBOX_CHANGE) looks like this:

METHOD handle_checkbox_change.

BREAK-POINT.

DATA: ld_nkey TYPE lvc_nkey.

DATA: lt_nodes TYPE lvc_t_nkey.

DATA: ld_ntext TYPE lvc_value,

ls_item_u TYPE lvc_s_laci,

ls_item TYPE lvc_s_layi,

lt_items TYPE lvc_t_layi.

ld_nkey = node_key.

" Get subtree of selected node (including selected node)

CALL METHOD tree1->get_subtree

EXPORTING

i_node_key = ld_nkey

IMPORTING

et_subtree_nodes = lt_nodes.

LOOP AT lt_nodes INTO ld_nkey.

CALL METHOD tree1->get_outtab_line

EXPORTING

i_node_key = ld_nkey

IMPORTING

E_OUTTAB_LINE =

e_node_text = ld_ntext

et_item_layout = lt_items

ES_NODE_LAYOUT =

EXCEPTIONS

node_not_found = 1

OTHERS = 2.

IF sy-subrc <> 0.

MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

ENDIF.

LOOP AT lt_items INTO ls_item

WHERE ( class = cl_gui_column_tree=>item_class_checkbox

AND editable = 'X' ).

CLEAR: ls_item_u.

MOVE-CORRESPONDING ls_item TO ls_item_u.

ls_item_u-chosen = checked. " mark checkbox

ls_item_u-u_chosen = 'X'. " do update of checkbox

CALL METHOD tree1->change_item

EXPORTING

i_node_key = ld_nkey

i_fieldname = tree1->c_hierarchy_column_name

i_data = ' '

i_u_data = ' '

is_item_layout = ls_item_u

EXCEPTIONS

node_not_found = 1

OTHERS = 2.

IF sy-subrc <> 0.

MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

ENDIF.

ENDLOOP. " items of a single node

ENDLOOP. " nodes

update frontend

CALL METHOD tree1->frontend_update.

ENDMETHOD. "handle_checkbox_change

Basically you should be able to Cut&Paste this coding and it will work on your ALV tree (CL_GUI_ALV_TREE).

Do not forget to register the required event and set the event handler:

define the events which will be passed to the backend

l_event-eventid = cl_gui_column_tree=>eventid_expand_no_children.

APPEND l_event TO lt_events.

l_event-eventid = cl_gui_column_tree=>eventid_checkbox_change.

APPEND l_event TO lt_events.

CALL METHOD tree1->set_registered_events

EXPORTING

events = lt_events

EXCEPTIONS

cntl_error = 1

cntl_system_error = 2

illegal_event_combination = 3.

IF sy-subrc <> 0.

MESSAGE x208(00) WITH 'ERROR'. "#EC NOTEXT

ENDIF.

SET HANDLER l_event_receiver->handle_checkbox_change FOR tree1.

Regards,

Uwe

Re: ALV Tree-Problem

Former Member — Mon, 31 Dec 2007 08:12:14 GMT

Hi Uwe,

Thanks for your immediate response. Now when i check the node of the check box the line items of that node are automatically selected. But when i try to deselect the node it is not working . Kindly Suggest me .

Regards,

Priyaranjan

Re: ALV Tree-Problem

Former Member — Mon, 31 Dec 2007 11:26:52 GMT

You can use the class CL_GUI_ALV_TREE and method SET_TABLE_FOR_FIRST_DISPLAY.

By performing a where used list on this - it would return sample and demo programs.

SAP also provides demo programs as follows:

BCALV_TEST_SIMPLE_TREE

BCALV_TREE_01

BCALV_TREE_02

BCALV_TREE_03

BCALV_TREE_04

BCALV_TREE_05

BCALV_TREE_06

BCALV_TREE_DEMO

BCALV_TREE_DND

They are easy to follow and if you dont have any complications can even reuse exact code from those programs.

Hope this helps.

http://www.sapdev.co.uk/reporting/alv/alvtree.htm

with regards,

Hema Sundara.

Re: ALV Tree-Problem

Former Member — Thu, 03 Jan 2008 06:51:20 GMT

Hi Uwe,

when the user select the node check box the line items of that node are automatically selected and i could capture the data which has been selected. But i when i try to deselect the node checkbox, only the node check box is deselected not the line items of that node. I have copied your code and paist in my code it is working for selection, not for deselection of the node. Please suggest me asap as it is urgent for me.

Regards,

Priyaranjan

Re: ALV Tree-Problem

Former Member — Thu, 03 Jan 2008 15:29:15 GMT

Hi,

Below is my code.

----

CLASS lcl_tree_event_receiver DEFINITION.

PUBLIC SECTION.

METHODS handle_checkbox_change

FOR EVENT checkbox_change OF cl_gui_alv_tree

IMPORTING node_key.

ENDCLASS.

CLASS lcl_tree_event_receiver IMPLEMENTATION.

METHOD handle_checkbox_change.

DATA: ld_nkey TYPE lvc_nkey.

DATA: lt_nodes TYPE lvc_t_nkey.

DATA: ld_ntext TYPE lvc_value,

ls_item_u TYPE lvc_s_laci,

ls_item TYPE lvc_s_layi,

lt_items TYPE lvc_t_layi.

ld_nkey = node_key.

" Get subtree of selected node (including selected node)

CALL METHOD tree1->get_subtree

EXPORTING

i_node_key = ld_nkey

IMPORTING

et_subtree_nodes = lt_nodes.

LOOP AT lt_nodes INTO ld_nkey.

CALL METHOD tree1->get_outtab_line

EXPORTING

i_node_key = ld_nkey

IMPORTING

E_OUTTAB_LINE =

e_node_text = ld_ntext

et_item_layout = lt_items

ES_NODE_LAYOUT =

EXCEPTIONS

node_not_found = 1

OTHERS = 2.

IF sy-subrc EQ 0.

MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

ENDIF.

LOOP AT lt_items INTO ls_item

WHERE ( class = cl_gui_column_tree=>item_class_checkbox

AND editable = 'X' ).

CLEAR: ls_item_u.

MOVE-CORRESPONDING ls_item TO ls_item_u.

IF ls_item_u-chosen = ' '.

ls_item_u-chosen = 'X'. " mark checkbox

ls_item_u-u_chosen = ' '. " do update of checkbox

ELSE.

ls_item_u-u_chosen = 'X'.

ls_item_u-u_editable = 'X'.

ENDIF.

CALL METHOD tree1->change_item

EXPORTING

i_node_key = ld_nkey

i_fieldname = tree1->c_hierarchy_column_name

i_data = ' '

i_u_data = 'X'

is_item_layout = ls_item_u

EXCEPTIONS

node_not_found = 1

OTHERS = 2.

IF sy-subrc EQ 0.

MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.

ENDIF.

ENDLOOP. " items of a single node

ENDLOOP. " nodes

gt_nodes[] = lt_nodes[].

REFRESH lt_nodes.

update frontend

CALL METHOD tree1->frontend_update.

ENDMETHOD. "handle_checkbox_change

end of Change-------

ENDCLASS.

Problem:

Here if i check the node the line items of that node are automatically selected, but when i deselect the node, the line items of that node are not deselected, only the node is deselected.

i tried a lot many ways to solve this problem, but not able to do that. Please suggest me to achieve this functionality.

Regards,

Priyaranjan