Webdynpro Dynamic layout manipulation: error attaching elements to Group

Question

Hi Experts,
I am trying to create dynamic layout during run time. Itu2019s working partially, but as soon as I add new u201CGroup elementu201D or new u201CTransparent elementu201D I am getting a null error. If I just use buttons, input field or text dynamically layout create it works fine. I want to group this fields in a groups or transparent container so that I can manipulate layout place containers where I need. As soon as I add other element (inputfield/button/text) to transparent element it errors. I have attached code below for more detail. Does anyone have similar issue? Lot of demo and example code show how to create elements (inputfield/button/text) none show how attach those element back to u201DGroupu201D or u201CTransparentu201D element.
I am creating dynamic elements in u201CViewu201D method u201CWDDOMODIFYVIEWu201D. Any idea or clue much appreciated. Thanks in advance.
Kind Regards,
Trim
method WDDOMODIFYVIEW .
  DATA lr_container  TYPE REF TO cl_wd_uielement_container.
  DATA lr_trans_cont TYPE REF TO CL_WD_TRANSPARENT_CONTAINER.
  DATA lr_input      TYPE REF TO cl_wd_input_field.
  DATA lr_table      TYPE REF TO cl_wd_table.
  DATA lo_nd_sflight TYPE REF TO if_wd_context_node.
  DATA lr_button     TYPE REF TO cl_wd_button.
  DATA lr_o_group     TYPE REF TO cl_wd_group.
  data: lr_text TYPE REF TO CL_WD_TEXT_VIEW.
  constants : gc_trs_cont type string value 'Trscont',
              gc_text1 type string value 'ePDA goals and activity of the team',
              gc_text2 type string value 'Complete all box and submit to manager'.
  DATA lo_el_context TYPE ref to if_wd_context_element.
navigate from <CONTEXT> to <SFLIGHT> via lead selection
  lo_nd_sflight = wd_context->get_child_node( name = wd_this->wdctx_sflight ).
  IF first_time = abap_true.
    lr_container ?= view->get_element( 'ROOTUIELEMENTCONTAINER' ).
    DATA lr_grid_data TYPE REF TO cl_wd_grid_data.
    DATA lr_flow_data TYPE REF TO cl_wd_flow_data.
    DATA lr_matrix    TYPE REF TO cl_wd_matrix_head_data.
    DATA lr_matrix_l    TYPE REF TO cl_wd_matrix_layout.
    DATA lr_matrix2    TYPE REF TO cl_wd_matrix_data.
   CALL METHOD CL_WD_TRANSPARENT_CONTAINER=>NEW_TRANSPARENT_CONTAINER
     EXPORTING
       ID      = '/0CUST/123'
       VIEW    = view
       WIDTH   = '100%'
     RECEIVING
       CONTROL = lr_trans_cont.
   lr_matrix = cl_wd_matrix_head_data=>new_matrix_head_data( lr_trans_cont ).
   lr_container->set_layout_data( lr_matrix ).
    data: lr_o_caption type ref to cl_wd_caption.
    CALL METHOD CL_WD_GROUP=>NEW_GROUP
      EXPORTING
        ID      = 'GRP1'
        design  = '03'
      RECEIVING
        CONTROL = lr_o_group.
   lr_o_caption = cl_wd_caption=>new_caption( text = 'Group1' ).
   lr_o_group->set_header( the_header = lr_o_caption ).
   cl_wd_flow_data=>new_flow_data( element = lr_o_group ).
   cl_wd_flow_layout=>new_flow_layout( container = lr_o_group ).
    lr_matrix = cl_wd_matrix_head_data=>new_matrix_head_data( lr_o_group ).
    lr_o_group->set_layout_data( lr_matrix ).
    CALL METHOD lr_container->add_child
      EXPORTING
        index     = 1
        the_child = lr_o_group.
    CALL METHOD cl_wd_button=>new_button
      EXPORTING
        enabled   = 'X'
        id        = 'B1'
        on_action = 'GET_FLIGHT'
        text      = 'Get Flight Data'
      RECEIVING
        control   = lr_button.
    lr_matrix2 = cl_wd_matrix_data=>new_matrix_data( lr_button ).
    lr_button->set_layout_data( lr_matrix2 ).
    CALL METHOD lr_o_group->add_child
      EXPORTING
       index     = 1
        the_child = lr_button.
    CALL METHOD cl_wd_input_field=>new_input_field
      EXPORTING
        bind_value = 'SFLIGHT.CARRID'
        id         = 'INPUT1'
      RECEIVING
        control    = lr_input.
    lr_matrix2 = cl_wd_matrix_data=>new_matrix_data( lr_input ).
   lr_input->set_layout_data( lr_matrix2 ).
    CALL METHOD lr_o_group->add_child
      EXPORTING
       index     = 2
        the_child = lr_input.
endmethod.
Edited by: Trim Chakrapani on Nov 15, 2011 5:01 PM

Answer 1

Hi
I suggest you  create a transparent container at design time and then use the below code in wddomodify to get a reference to the transparent container.
  DATA: lv_container TYPE string,
              lo_container TYPE REF TO cl_wd_transparent_container.
        lv_container = 'TransparentContainer'.
        lo_container ?= view->get_element( lv_container ).
        lo_container->add_child( lo_button ).
Hope this helps.