Tree View:1. Create table view.2. For the context node in the
view change the super class of the context node class to
CL_BSP_WD_CONTEXT_NODE_TREE.3. Now, context node has become a tree
node, we will get a tree structure symbol at context node, if not
then log off and login to SAP again.4. Make a class with
CL_BSP_WD_TREE_NODE_PROXY as super class in se24 Tcode .5. Just
redefine get_children method of that class as it is an abstract
method, now activate the class.6. Now in view there are two methods
which come from super class of context node class, as shown in
figure below.
7. GET_TABLE_LINE_SAMPLE: this method is used to define fields
in tree structure, by default code is generated but we can redefine
it as per our need, below is the default code which forms the
structure for tree as to which fields will be there in tree
configuration.
In above case ZCUST_HIER_HIST is the attribute structure for the
bol entity attached to context node.8. REFRESH: this method
initializes the tree, we assign the class which was created in step
4.
In above code we iterate through the entities in collection
wrapper and then for those entities who do not have a parent I make
them a root node by assigning the class created in step 4 in
get_proxy method. This was my requirement, one can choose the
particular entities which they want and then make them root
.Lv_root->expand_node( ): Call to expand( ) flags the node to be
expanded which during tree formation leads to call to get_children
method which we will define later.9. This refresh method attaches
the class we created in step 4 with our tree context node, you will
see the class under tree context node after activating refresh
method, if not then log off and log in to SAP.10. Now we have two
options for children to the root node, it depends on requirement,
if we need same structure for the child, then we redefine the
get_children method of the class created in step 4
as:DATA:lv_value_nodeTYPEREFTOcl_bsp_wd_value_node,lv_childTYPEREFTOif_bsp_wd_tree_node.
lv_child=me->node_factory->get_proxy(iv_bo=lv_value_nodeiv_parent_proxy=meiv_proxy_type='ZCL_EBH_ERH_HIST_TREE_PROXY').lv_child->expand_node().APPENDlv_childTOrt_children.
By passing the same class name in get_proxy method we make
recursive child of the same type.We can add as many children as we
want at a level by calling the same method again and appending the
children to rt_children parameter of get_children method.
11. Replace the .htm with code below.
nodeTextColumn: it defines the first node of tree on which you
want expandd and collapse to happen.
12. Add below shown attribute to context node class:
13. Make event handler collapse and expand and add code
below:EH_ONEXPAND:DATA:lv_tree_eventTYPEREFTOcl_thtmlb_tree.
lv_tree_event?=htmlb_event_ex.typed_context->EBHRESULT->expand_node(lv_tree_event->row_key).
EH_ONCOLLAPSE:DATA:lv_tree_eventTYPEREFTOcl_thtmlb_tree.
lv_tree_event?=htmlb_event_ex.typed_context->EBHRESULT->collapse_node(lv_tree_event->row_key).
14. Redefine
do_prepare_outputDATA:lv_indexTYPEsy-tabix.DATA:lv_tree_nodeTYPEREFTOif_bsp_wd_tree_node.DATA:lv_proxy_nodeTYPEREFTOcl_bsp_wd_tree_node_proxy.DATA:lv_nTYPEi.DATA:lv_rTYPEi,lt_ebh_histTYPETABLEOFzcust_hier_hist,ls_ebh_histTYPEzcust_hier_hist,lv_iteratorTYPEREFTOif_bol_bo_col_iterator,lv_entityTYPEREFTOcl_crm_bol_entity.
super->do_prepare_output(iv_first_time=iv_first_time).
*ifnothingselected->selectalwaysthefirstnodelv_index=typed_context->EBHRESULT->selected_index.IFlv_indexEBHRESULT->get_node_by_index(1).IFlv_proxy_nodeISBOUND.typed_context->EBHRESULT->deselect_all().lv_proxy_node->if_bsp_wd_tree_node~selected=abap_true.
ENDIF.ENDIF.IFtyped_context->EBHRESULT->node_tabISINITIAL.typed_context->EBHRESULT->refresh().ENDIF.
typed_context->EBHRESULT->build_table().
lv_index=typed_context->EBHRESULT->selected_index.*ifcomingfromtheanotherpage,e.g.editmodeIFtyped_context->EBHRESULT->visible_first_row_indexISINITIAL.typed_context->EBHRESULT->visible_first_row_index=1.ELSE.*ifstayingonthesameview,e.g.positiontyped_context->EBHRESULT->visible_first_row_index=lv_index.ENDIF.
IFlv_index>typed_context->EBHRESULT->maxrowsnumber.lv_n=lv_indexDIVtyped_context->EBHRESULT->maxrowsnumber.lv_r=lv_indexMODtyped_context->EBHRESULT->maxrowsnumber.IFlv_r=0.lv_n=lv_n-1.ENDIF.lv_n=1+(lv_n*typed_context->EBHRESULT->maxrowsnumber).typed_context->EBHRESULT->visible_first_row_index=lv_n.ENDIF.15.
Now redefine IF_BSP_WD_TREE_NODE~GET_ICON and do not add any code
and activate.16. Tree
