At new and At last Concept

Question

Hi All,
Is their any Possibilities to use AT LAST and AT NEW Concepts in WebDynpro ABAP.
Plz Give me the solution with an Example
Regards,
Vimalraj

Answer 1

Hi  Vimalraj,
yes you can use at new and at last as you would use in normal abap....
lets say i have a context node called: TABLE_NODE
and this node has two attributes, name: field1 and field2.... field1 is of type char and field2 is of type p.
table_node
>field1
>field2
and a context node called : TOTAL with an attribute "VALUE".  value is of type p.
total
>value
now i am interested in doing the sum for field2 and display that sum on my view....the ui element which is bound to my node "total"  attribute "value".  And also i am only interested in the sum of field value "A"...pls see code below.
so here is the code:
DATA lo_nd_table_node TYPE REF TO if_wd_context_node.
  DATA lo_el_table_node TYPE REF TO if_wd_context_element.
  DATA ls_table_node TYPE wd_this->element_table_node.
  DATA lt_table_node TYPE wd_this->elements_table_node.
navigate from <CONTEXT> to <TABLE_NODE> via lead selection
  lo_nd_table_node = wd_context->get_child_node( name = wd_this->wdctx_table_node ).
  lo_nd_table_node->get_static_attributes_table(
  IMPORTING
  table = lt_table_node ).
  ls_table_node-field1 = 'A'.
  ls_table_node-field2 = '1.0'.
  APPEND ls_table_node TO lt_table_node.
  ls_table_node-field1 = 'A'.
  ls_table_node-field2 = '2.0'.
  APPEND ls_table_node TO lt_table_node.
  ls_table_node-field1 = 'B'.
  ls_table_node-field2 = '5.0'.
  APPEND ls_table_node TO lt_table_node.
  ls_table_node-field1 = 'B'.
  ls_table_node-field2 = '2.0'.
  APPEND ls_table_node TO lt_table_node.
  DATA lo_nd_total TYPE REF TO if_wd_context_node.
  DATA lo_el_total TYPE REF TO if_wd_context_element.
  DATA ls_total TYPE wd_this->element_total.
  DATA lv_value LIKE ls_total-value.
navigate from <CONTEXT> to <TOTAL> via lead selection
  lo_nd_total = wd_context->get_child_node( name = wd_this->wdctx_total ).
get element via lead selection
  lo_el_total = lo_nd_total->get_element(  ).
get single attribute
  lo_el_total->get_attribute(
    EXPORTING
      name =  `VALUE`
    IMPORTING
      value = lv_value ).
  LOOP AT lt_table_node INTO ls_table_node.
    AT NEW field1.
      SUM.
      IF ls_table_node-field1 = 'A'.
        lv_value = ls_table_node-field2.   "at this point lv_value will be 3...
      ENDIF.
    ENDAT.
    lo_nd_table_node->bind_table( lt_table_node ).
  ENDLOOP.
get single attribute
  lo_el_total->set_attribute(
    EXPORTING
      name =  `VALUE`
      value = lv_value ).
that is all....similarly we can use at last.....
hope this helps...
J.
Edited by: J Are on Feb 22, 2009 6:49 PM