ABAP WD: TreeByKeyTableColumn in ALV table (SALV_WD_TABLE)

Question

Hello,
is is possible to add a TreeByKeyTableColumn object to a ALV table created
using the SALV_WD_TABLE interface?
I know that this question has already been posted several times - but the general answer ("use hierarchy columns and set_display_type( ..)") is not satisfying, since I have got the following:
The context node of cardinality 0..n which corresponds to the "column tree" to be displayed has got
- one KEY attribute
- one PARENT_KEY attribute
- one NODE_TEXT attribute
- several attributes which correspond to the table lines (respectively tree lines)
Example:
The context of cardinality 0..n has got six attributes:
KEY, PARENT_KEY, NODE_TEXT, col1 col2 col3.
During runtime, there are five "lines" in this node:
KEY    PARENT_KEY    NODE_TEXT   col1 col2 col3
1         (none)                 "node1"             a      a     a
2         1                        "node2"             b      b     b
3         2                        "node3"             c      c     c
4         1                        "node4"             d      d     d
5         (none)                 "node5"             e      e     e
The result should be in this case as if I'd have
- a table with the columns col1, col2, col3 and
- a TreeByKeyTableColumn with
     -- ROW_KEY      bound to KEY
     -- PARENT_KEY bound to PARENT_KEY
     -- containing a TextView with TEXT bound to NODE_TEXT
Result in Display:
-> node1             a   a   a                 <= Top level node
    ---> node2        b   b   b                 <= child of node with text "node1"
> node3   c   c   c                 <= child of node with text "node2"
    ---> node4        d   d   d                 <= child of node with text "node1"
-> node5            e   e   e                 <= Top level node
Can this be established with the built in hierarchy functionality of the SALV_WD_TABLE interface, too?
When playing around with the hierarchy columns functionality of SALV_WD_TABLE, I always got extra lines for the tree nodes with empty cells to the right (which I definitly don't want), and I was not able to use the parent_key<->key information already contained in the context node attributes.
But perhaps I have overlooked something?
Or is it possible to get somehow, by wild navigation through the available objects/classes/interfaces of the SALV_WD_TABLE interface, a reference to the corresponding table UI element to be able to dynamically add a TreeByKeyTableColumn with the wanted bindings?
Regards & thanks for your help
--Ute

Answer 1

Once you have created a boolean attribute 'DAYS_READONLY' in the node bound to the DATA node of ALV, you need to set this attribute to false (for that row)  if you want DAYS field to be editable when the user creates another row. In the method where you have populated the data which is being displayed make this attribute as true for those rows.
After this where you have made the ALV config settings write the following code.
  DATA: lr_input_field TYPE REF TO cl_salv_wd_uie_input_field.
  lr_column = lr_column_settings->get_column( 'DAYS' ).
  CREATE OBJECT lr_input_field EXPORTING value_fieldname = 'DAYS'.
  lr_column->set_cell_editor( lr_input_field ).
  lr_input_field->set_read_only_fieldname( value = 'DAYS_READONLY' ).
  CALL METHOD lr_column_settings->delete_column
    EXPORTING
      id     = 'DAYS_READONLY'
In this code you are creating input field as a cell editor and assigning it to DAYS column. After this you are setting the readonly property of the column DAYS to the value of the column 'DAYS_READONLY'. Since this column can have different values for each row, the column DAYS will be made readonly/editable accordingly. Finally you are deleting the column DAYS_READONLY from ALV output as we do not want to display its value to the user.
For more info you can refer to thread: [ALV  List  in the same Column for the row  CELL  i need button or value;
Edited by: Pooja Patodia on Mar 16, 2011 9:54 AM