How to get data from a dynamic node in Webdynpro ABAP ?

Hi,

I have come across many scn threads which refer to “How to read / get data from a dynamic node” .

Here I would like to demonstrate, the steps to read the data from a node ( either static / dynamic node ) in Webdynpro ABAP.

I have divided the task into 3 methods

GET_NODE_INFO( ) – Get node information from node name
GET_NODE_DATA_TYPE( ) – Get node data type & attribute list by using node reference ( if_wd_context_node )
GET_DATA( ) – Get data of any given node reference

All you need to do is … just create these 3 methods as is and start using for reading data from a given node ( either static node / dynamic node )

Now, let us look into the code of each method as below

GET_NODE_INFO( )

Parameters:

Parameter	Type	Ref To	Optional	Associated Type	Description
ID_NODE_NAME	Importing			STRING	Node Name
IO_PARENT_NODE	Importing	Checked	Yes	IF_WD_CONTEXT_NODE	Parent Node Reference
EO_NODE_INFO	Exporting	Checked		IF_WD_CONTEXT_NODE_INFO	Node info reference
ED_ERROR_MESSAGE	Exporting			STRING	error message
EO_NODE	Exporting	Checked		IF_WD_CONTEXT_NODE	Node reference

Logic:

GET_NODE_INFO
METHOD get_node_info . DATA: lo_node_info TYPE REF TO if_wd_context_node_info, lo_parent_node TYPE REF TO if_wd_context_node, lv_node_name TYPE string, lx_root TYPE REF TO cx_root. TRY. “============================================= ” check if node name is supplied, ” if so nothing do , return the control “============================================= IF id_node_name IS INITIAL. RETURN. ELSE. lv_node_name = id_node_name. TRANSLATE lv_node_name TO UPPER CASE. ENDIF. “============================================= ” Check if io_parent_node is not bound, if so ” Assume parent node is WD_CONTEXT “============================================= IF io_parent_node IS NOT BOUND. lo_parent_node = wd_context. ELSE. lo_parent_node = io_parent_node. ENDIF. “============================================= “get node info “============================================= eo_node = lo_parent_node->get_child_node( name = lv_node_name ). eo_node_info = eo_node->get_node_info( ). CATCH cx_root INTO lx_root. ed_error_message = lx_root->get_text( ). ENDTRY. ENDMETHOD.

GET_NODE_INFO

METHOD get_node_info .

DATA:    lo_node_info    TYPE REF TO if_wd_context_node_info,
           lo_parent_node TYPE REF TO if_wd_context_node,
           lv_node_name    TYPE string,
           lx_root         TYPE REF TO cx_root.

TRY.
      “=============================================
      ” check if node name is supplied,
      ” if so nothing do , return the control
      “=============================================
      IF id_node_name IS INITIAL.
        RETURN.
      ELSE.
        lv_node_name = id_node_name.
        TRANSLATE lv_node_name TO UPPER CASE.
      ENDIF.

      “=============================================
      ” Check if io_parent_node is not bound, if so
      ” Assume parent node is WD_CONTEXT
      “=============================================
      IF io_parent_node IS NOT BOUND.
        lo_parent_node = wd_context.
      ELSE.
        lo_parent_node = io_parent_node.
      ENDIF.

      “=============================================
      “get node info
      “=============================================
      eo_node = lo_parent_node->get_child_node( name = lv_node_name ).

eo_node_info = eo_node->get_node_info( ).

CATCH cx_root INTO lx_root.
ed_error_message = lx_root->get_text( ).
ENDTRY.

ENDMETHOD.

———————————————————-

GET_NODE_DATA_TYPE( )

Parameters:

Parameter	Type	Ref To	Associated Type	Description
IO_NODE_INFO	Importing	Checked	IF_WD_CONTEXT_NODE_INFO	Node info Reference
ED_ERROR_MESSAGE	Exporting		STRING	Error message
EO_DATA	Exporting	Checked	DATA	Node data type ref
ET_FCAT	Exporting		LVC_T_FCAT	Attributes/fields list

Logic:

GET_NODE_DATA_TYPE
METHOD GET_NODE_DATA_TYPE . CLEAR: eo_data, et_fcat, ed_error_message. TRY . DATA: lo_table TYPE REF TO data, ls_fcat TYPE lvc_s_fcat, lt_attr TYPE wdr_context_attr_info_map, ls_attr LIKE LINE OF lt_attr, lx_root TYPE REF TO cx_root. IF io_node_info IS NOT BOUND. ed_error_message = ‘Node info is invalid’. RETURN. ENDIF. “============================================= ” get attributes “============================================= lt_attr = io_node_info->get_attributes( ). LOOP AT lt_attr INTO ls_attr. CLEAR ls_fcat. ls_fcat-fieldname = ls_attr-name. ls_fcat-datatype = ls_attr-type_name. APPEND ls_fcat TO Et_fcat. ENDLOOP. cl_alv_table_create=>create_dynamic_table( EXPORTING it_fieldcatalog = Et_fcat i_length_in_byte = abap_true IMPORTING ep_table = lo_table EXCEPTIONS generate_subpool_dir_full = 1 OTHERS = 2 ). IF sy-subrc <> 0. * MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno * WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4. ENDIF. ” if node is multiple ( 0..n / 1..n ) return table type IF io_node_info->is_multiple( ) EQ abap_true. eo_data = lo_table. ELSE. FIELD-SYMBOLS: <lt_table> TYPE STANDARD TABLE. ASSIGN lo_table->* TO <lt_table>. IF <lt_table> IS ASSIGNED. CREATE DATA eo_data LIKE LINE OF <lt_table>. ENDIF. ” else, return the ENDIF. CATCH cx_root INTO lx_root. ed_error_message = lx_root->get_text( ). ENDTRY. ENDMETHOD.

GET_NODE_DATA_TYPE

METHOD GET_NODE_DATA_TYPE .
CLEAR:
      eo_data,
      et_fcat,
      ed_error_message.
TRY .

      DATA:
            lo_table        TYPE REF TO data,
            ls_fcat         TYPE lvc_s_fcat,
            lt_attr         TYPE wdr_context_attr_info_map,
            ls_attr         LIKE LINE OF lt_attr,
            lx_root         TYPE REF TO cx_root.

      IF io_node_info IS NOT BOUND.
        ed_error_message = ‘Node info is invalid’.
        RETURN.

ENDIF.

      “=============================================
      ” get attributes
      “=============================================
      lt_attr = io_node_info->get_attributes( ).

      LOOP AT lt_attr INTO ls_attr.
        CLEAR ls_fcat.
        ls_fcat-fieldname = ls_attr-name.
        ls_fcat-datatype = ls_attr-type_name.
        APPEND ls_fcat TO Et_fcat.

ENDLOOP.

      cl_alv_table_create=>create_dynamic_table(
        EXPORTING
          it_fieldcatalog           = Et_fcat
          i_length_in_byte          = abap_true
        IMPORTING
          ep_table                  = lo_table
        EXCEPTIONS
          generate_subpool_dir_full = 1
          OTHERS                    = 2
      ).

      IF sy-subrc <> 0.
*       MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
*                  WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
      ENDIF.

      ” if node is multiple ( 0..n / 1..n ) return table type
      IF io_node_info->is_multiple( ) EQ abap_true.
        eo_data = lo_table.
      ELSE.
        FIELD-SYMBOLS: <lt_table> TYPE STANDARD TABLE.
        ASSIGN lo_table->* TO <lt_table>.
        IF <lt_table> IS ASSIGNED.

CREATE DATA eo_data LIKE LINE OF <lt_table>.

        ENDIF.
        ” else, return the
      ENDIF.
    CATCH cx_root INTO lx_root.
      ed_error_message = lx_root->get_text( ).
ENDTRY.
ENDMETHOD.

———————————————————-

GET_DATA( )

Parameters:

Parameter	Type	Ref To	Associated Type	Description
IO_NODE	Importing	Checked	IF_WD_CONTEXT_NODE	Node reference
ED_ERROR_MESSAGE	Exporting		STRING	Error message
EO_DATA	Exporting	Checked	DATA	Data
ET_FCAT	Exporting		LVC_T_FCAT	Fields

Logic:

GET_DATA
METHOD GET_DATA . DATA lv_count TYPE i. DATA ls_fcat TYPE lvc_s_fcat. DATA lv_index TYPE i. DATA lv_attr_name TYPE string. DATA lx_root TYPE REF TO cx_root. FIELD-SYMBOLS: <lt_data> TYPE STANDARD TABLE, <ls_data> TYPE any, <lv_value> TYPE any. TRY. IF io_node IS NOT BOUND. ed_error_message = ‘Node reference cannot be empty’. RETURN. ENDIF. ” Get node data type and attribute list wd_this->get_node_data_type( EXPORTING io_node_info = io_node->get_node_info( ) IMPORTING eo_data = eo_data et_fcat = et_fcat ed_error_message = ed_error_message ). ” Return if any error or data type is not bound IF ed_error_message IS NOT INITIAL OR eo_data IS NOT BOUND. RETURN. ENDIF. ASSIGN eo_data->* TO <lt_data>. ” get the no. of elements available in context node lv_count = io_node->get_element_count( ). ” do for each element DO lv_count TIMES. ” collect index value lv_index = sy-index. ” Create a blank line and get the ref into <ls_dat> APPEND INITIAL LINE TO <lt_data> ASSIGNING <ls_data>. ” return if line type is not assigned IF <ls_data> IS NOT ASSIGNED. RETURN. ENDIF. ” Loop over each field/attribute and get the data LOOP AT et_fcat INTO ls_fcat. ASSIGN COMPONENT ls_fcat-fieldname OF STRUCTURE <ls_data> TO <lv_value>. IF <lv_value> IS ASSIGNED. lv_attr_name = ls_fcat-fieldname. io_node->get_attribute( EXPORTING index = lv_index name = lv_attr_name IMPORTING value = <lv_value> ). ENDIF. ENDLOOP. ENDDO. CATCH cx_root INTO lx_root. ed_error_message = lx_root->get_text( ). ENDTRY. ENDMETHOD.

GET_DATA

METHOD GET_DATA .

DATA lv_count         TYPE i.
DATA ls_fcat          TYPE lvc_s_fcat.
DATA lv_index         TYPE i.
DATA lv_attr_name     TYPE string.
DATA lx_root          TYPE REF TO cx_root.

FIELD-SYMBOLS: <lt_data> TYPE STANDARD TABLE,
<ls_data> TYPE any,
<lv_value> TYPE any.

TRY.

      IF io_node IS NOT BOUND.
        ed_error_message = ‘Node reference cannot be empty’.
        RETURN.
      ENDIF.

” Get node data type and attribute list

     wd_this->get_node_data_type(
        EXPORTING
          io_node_info = io_node->get_node_info( )
        IMPORTING
          eo_data = eo_data
          et_fcat = et_fcat
          ed_error_message = ed_error_message
      ).

      ” Return if any error or data type is not bound
      IF ed_error_message IS NOT INITIAL OR
         eo_data IS NOT BOUND.

RETURN.
ENDIF.

ASSIGN eo_data->* TO <lt_data>.

” get the no. of elements available in context node
lv_count = io_node->get_element_count( ).

” do for each element
DO lv_count TIMES.

” collect index value
lv_index = sy-index.

        ” Create a blank line and get the ref into <ls_dat>
        APPEND INITIAL LINE TO <lt_data> ASSIGNING <ls_data>.
        ” return if line type is not assigned
        IF <ls_data> IS NOT ASSIGNED.
          RETURN.
        ENDIF.

” Loop over each field/attribute and get the data
LOOP AT et_fcat INTO ls_fcat.

ASSIGN COMPONENT ls_fcat-fieldname
OF STRUCTURE <ls_data> TO <lv_value>.

IF <lv_value> IS ASSIGNED.
lv_attr_name = ls_fcat-fieldname.

            io_node->get_attribute(
              EXPORTING
                index = lv_index
                name = lv_attr_name
              IMPORTING
                value = <lv_value>
            ).
          ENDIF.

ENDLOOP.

ENDDO.

CATCH cx_root INTO lx_root.
ed_error_message = lx_root->get_text( ).
ENDTRY.
ENDMETHOD.

—————————————————-

Example:

Scenario: Let us say we need to read data from a node “NODE_DYN”.

Example
————————– ” Data declarations DATA: lo_data TYPE REF TO data. DATA lo_node TYPE REF TO if_wd_context_node. FIELD-SYMBOLS: <lt_data> TYPE STANDARD TABLE. ” Get node information wd_this->get_node_info( EXPORTING id_node_name = ‘NODE_DYN’ * io_parent_node = IMPORTING * eo_node_info = LO_NODE_INFO eo_node = lo_node * ed_error_message = ). ” Get the data from context node wd_this->get_data( EXPORTING io_node = lo_node IMPORTING eo_data = lo_data * et_fcat = * ed_error_message = ). ” assign data into dynamic table *ASSIGN lo_data-> to <lt_data>**. ————————–

Example

————————–

” Data declarations

DATA: lo_data TYPE REF TO data.
DATA lo_node TYPE REF TO if_wd_context_node.

FIELD-SYMBOLS: <lt_data> TYPE STANDARD TABLE.

” Get node information

      wd_this->get_node_info(
        EXPORTING
          id_node_name     = ‘NODE_DYN’
*      io_parent_node   =
        IMPORTING
*      eo_node_info     = LO_NODE_INFO
          eo_node          = lo_node
*      ed_error_message =
      ).

” Get the data from context node

     wd_this->get_data(
        EXPORTING
          io_node          = lo_node
        IMPORTING
          eo_data          = lo_data
*     et_fcat          =
*     ed_error_message =
      ).

” assign data into dynamic table

ASSIGN lo_data->* to <lt_data>.

————————–

The internal table <lt_data> contains the data of our node “NODE_DYN”

Hope this helps for those looking for reading the data of any given node ( dynamicnode / static node )

I appreciate if any comments/suggestions from you 🙂

5 Comments

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Dharmkrit Bhagat June 5, 2014 at 10:00 am

Hi Rama,

Nice document .

like (0)
Kirubakar Ezhilmani May 21, 2015 at 8:10 am

Hello Ram,

We were developing a highly dynamic WebDynpro application with dynamic tabstrips and Dynaminc table with columns in each tabstrip. Your document really helped me to solve a major problem with which I was stuck for quite a while.

I just wanted to thank you.

Kirubakar Ezhilmani

like (0)
1. Ramakrishnappa Gangappa Post authorMay 28, 2015 at 2:38 am
  
  Hi Kirubakar,
  
  I am glad that it was helpful to you 🙂 and I appreciate your gesture on feedback.
  
  Thanks and all the very best.
  
  Regards,
  
  Rama
  
  like (0)
Puneet Arora July 23, 2015 at 7:35 am

Hi Rama,

While creating the method get_node_info, it is throwing an error in the logic that

the field eo_node cant be change.

eo_node = lo_parent_node->get_child_node( name = lv_node_name ).

Please correct me if I am doing anything wrong here.

Thanks,

Puneet

like (0)
Jwala ESS MSS September 23, 2015 at 6:11 am

i will try this …nice doc u created

like (0)