Expand node event cl_gui_alv_tree

[Former Member]

Hi all,

I have an ALV_TREE and I want to do one thing when you expand a node, but I do not know how to control it.

I created the method for the double_click event but I do not know how to do it for the event EXPAND_NC. I do not work so well that double_click.

Do you know how?

What is the event I should use?

Thanks in advance.

[Former Member]

Hi all,

I have an ALV_TREE and I want to do one thing when you expand a node, but I do not know how to control it.

I created the method for the double_click event but I do not know how to do it for the event EXPAND_NC. I do not work so well that double_click.

Do you know how?

What is the event I should use?

Thanks in advance.

[Former Member]

EXPAND_NC is the event

NODE_DOUBLE_CLICK handler to be used

[Former Member]

Thanks Gayathri, but I can not make it work.

This is part of my code;

*&---------------------------------------------------------------------*
* Events class;
*&---------------------------------------------------------------------*
CLASS lcl_tree_event_receiver DEFINITION.

  PUBLIC SECTION.
    METHODS node_double_click
      FOR EVENT node_double_click OF cl_gui_alv_tree
      IMPORTING node_key.
    METHODS item_double_click
      FOR EVENT item_double_click OF cl_gui_alv_tree
      IMPORTING node_key.
    METHODS expand_node
      FOR EVENT EXPAND_NC OF cl_gui_alv_tree
      IMPORTING node_key.

ENDCLASS.                    "lcl_tree_event_receiver DEFINITION
*&---------------------------------------------------------------------*
*&   Class (Implementation)lcl_tree_event_receive*
*&---------------------------------------------------------------------*
*        Text
*----------------------------------------------------------------------*

CLASS lcl_tree_event_receiver IMPLEMENTATION.

  METHOD node_double_click.
    PERFORM trigger_dblclick_event USING node_key.
  ENDMETHOD.                    "handle_node_double_click

  METHOD item_double_click.
    PERFORM trigger_dblclick_event USING node_key.
  ENDMETHOD.                    "handle_node_double_click

  METHOD expand_node.
    PERFORM p_expand_node USING node_key.
  ENDMETHOD.

form REGISTER_EVENTS .

* Event registration: tell ALV Tree which events shall be passed
* from frontend to backend.
  DATA: lt_events TYPE cntl_simple_events,
        l_event TYPE cntl_simple_event,
        l_event_receiver TYPE REF TO lcl_tree_event_receiver.

* Frontend registration:  get already registered tree events
  CALL METHOD g_alv_tree->get_registered_events
    IMPORTING
      events = lt_events.

* Frontend registration: add additional event ids
  l_event-eventid = cl_gui_column_tree=>eventid_node_double_click.
  APPEND l_event TO lt_events.

  l_event-eventid = cl_gui_column_tree=>eventid_item_double_click.
  APPEND l_event TO lt_events.

  l_event-eventid = cl_gui_column_tree=>EVENTID_EXPAND_NO_CHILDREN.
  APPEND l_event TO lt_events.


* Frontend registration: provide new event table to alv tree
  CALL METHOD g_alv_tree->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.

* Register events on backend (ABAP Objects event handling)
  CREATE OBJECT l_event_receiver.
  SET HANDLER l_event_receiver->node_double_click FOR g_alv_tree.
  SET HANDLER l_event_receiver->item_double_click FOR g_alv_tree.
  SET HANDLER l_event_receiver->expand_node FOR g_alv_tree.

endform.                    " REGISTER_EVENTS

I put a break-point in trigger_dblclick_event and p_expand_node performs. The program stops at the break of the double click but not for an expanded node

What am I doing wrong?

[Former Member]

the name of the event explain this;

expand_NO_CHILDREN.

This only work with nodes without childrens.

In order to display the icon of expand in a node without children in the call of method add_node, pass this;

ls_node_layout-EXPANDER = 'X'.