Custom Search View Error

Question

I have been trying custom search by using CL_BSP_WD_ADVSEARCH_CONTROLLER class.
I replaced the super class of my context with CL_BSP_WD_CONTEXT_NODE_ASP. I did required settings on configurations tab. I added the code blow in search.htm.
<thtmlb:advancedSearch id                = "advs0"
                       fieldMetadata     = "<%= controller->GET_DQUERY_DEFINITIONS( ) %>"
                       header            = "<%= search->get_param_struct_name( ) %>"
                       fieldNames        = "<%= controller->GET_POSSIBLE_FIELDS( ) %>"
                       values            = "//search/PARAMETERS"
                       maxHits           = "//search/MAX_HITS"
                       onEnter           = "SEARCH"
                       ajaxDeltaHandling = "false" />
but I got error when I give <%= search->get_param_struct_name( ) %> to "header" parameter. Then I changed this with my structure name like below.
This is error :
ZDND_REPORT_002 ZDND_REPORT_002/viewTest.
CX_SY_REF_IS_INITIAL - Dereferencing of the NULL reference 
ZDND_REPORT_002 
viewTest.htm 
CL_O2DAFSXOJ11GTUP2CSVJ482B88Y=>_ONLAYOUT 
<thtmlb:advancedSearch id                = "advs0"
                       fieldMetadata     = "<%= controller->GET_DQUERY_DEFINITIONS( ) %>"
                       header            = "ZSEARCH_STRC"
                       fieldNames        = "<%= controller->GET_POSSIBLE_FIELDS( ) %>"
                       values            = "//search/PARAMETERS"
                       maxHits           = "//search/MAX_HITS"
                       onEnter           = "SEARCH"
                       ajaxDeltaHandling = "false" />
When I tested my page I didn't get any errors but I couldn't see my parameters on screen.
Thank you for your helps...

Answer 1

Hi,
I realized that the difference of BT120S_CPL/AdvSearchCampaignEF component from mine is  ,the SET_MODELS method was redefine with adding "SEARCH" context
as an attribute.  The problem has been solved by redefining CL_BSP_WD_ADVSEARCH_CONTROLLER class SET_MODELS method and adding the code below.
method SET_MODELS.
*CALL METHOD SUPER->SET_MODELS
EXPORTING
   VIEW   =
    view->set_attribute(
      name   = 'Search'
      value  = typed_context->Search ).
endmethod.
Thank you.