Dynamic usage - missing step...?

Question

I have a component that I want to embed 1...n times within another component, inside Viewer Container UiElements. For a test, I'm just embedding one component, and hardcoding many values. But I can't get it to work - I don't get any errors, but I don't see any results on the screen.
The view is called VMAIN, the window WMAIN, the embedded component YEMBED. YEMBED is listed as a used component in both the view and the component controllers. YEMBED contains a text viewer element with fixed text.
The build usages method in the component controller looks like this:
   DATA usage TYPE wdapi_component_usage.
   usage-component_usage_name = |USAGE1|.
   usage-embedding_position = |VMAIN/VCU1|.
   usage-component_usage = wd_this->wd_cpuse_used_component(
           )->create_comp_usage_of_same_type( usage-component_usage_name ).
   usage-used_component = |YEMBED|.
   INSERT usage INTO TABLE wd_this->usages.
   wd_this->fire_prepare_navigation_evt( ).
The event "prepare_navigation_evt" is handled by a method in the view
  LOOP AT wd_comp_controller->usages INTO DATA(usage).
     wd_this->wd_get_api( )->prepare_dynamic_navigation(
         source_window_name = 'WMAIN'
         source_vusage_name = 'VMAIN_USAGE_1'
         source_plug_name = ''
         target_component_name = usage-used_component
         target_component_usage = usage-component_usage_name
         target_view_name = 'MAIN'
         target_plug_name = 'DEFAULT'
         target_embedding_position = usage-embedding_position ).
     IF usage-component_usage->has_active_component( ) IS INITIAL.
       usage-component_usage->create_component( ).
     ENDIF.
   ENDLOOP.
Finally, wdomodifyview looks like this:
   IF first_time EQ abap_true.
     DATA root TYPE REF TO cl_wd_transparent_container.
     root ?= view->get_element( |ROOTUIELEMENTCONTAINER| ).
     DATA(vcu) = cl_wd_view_container_uielement=>new_view_container_uielement(
                                                 id = |VCU1| view = view ).
     cl_wd_flow_data=>new_flow_data( vcu ).
     root->add_child( vcu ).
   ENDIF.
All help and tips gratefully received! I think I've included enough information, but if not, let me know.
thanks
matt

Answer 1

Hi Matthew,
We need an outbound plug with dynamic navigation! Please check this SAP help for reference: http://help.sap.com/saphelp_erp2005/helpdata/en/4c/60154219fce12ce10000000a1550b0/content.htm
I just modified your code. Please see the below code:
LOOP AT wd_comp_controller->usages INTO DATA(usage).
    wd_this->wd_get_api( )->prepare_dynamic_navigation(
        source_window_name = 'WMAIN'
        source_vusage_name = 'VMAIN_USAGE_1'
        source_plug_name = ' '
        target_component_name = usage-used_component
        target_component_usage = usage-component_usage_name " Not required
        target_view_name =  usage-used_component | 'YEMBED' Interface View Name
        target_plug_name = 'DEFAULT'
        target_embedding_position = usage-embedding_position ).
  ENDLOOP.
    wd_this->fire_to_out_plg( ).  " to_out is outbound plug of VMAIN
Or you can use do_dynamic_navigation( ) method.
LOOP AT wd_comp_controller->usages INTO DATA(usage).
    wd_this->wd_get_api( )->do_dynamic_navigation(
        source_window_name = 'WMAIN'
        source_vusage_name = 'VMAIN_USAGE_1'
        source_plug_name = 'TO_OUT' " Out bound plug name
        target_component_name = usage-used_component
        target_component_usage = usage-component_usage_name
        target_view_name =  usage-used_component | 'YEMBED' Interface View Name
        target_plug_name = 'DEFAULT'
        target_embedding_position = usage-embedding_position ).
  ENDLOOP.
Please revert for further queries.
Regards,
Kiran