个人收藏 Programming dynamic ALV in WebDynpro for ABAP

Programming dynamic ALV in WebDynpro for ABAP

Scenario:


To create a dynamic ALV based on a dynamic context node in Web Dynpro for ABAP.
As a Case study, we’ll use the SFLIGHT flight data to select which data fields
we want to show in an ALV.

Procedure

:



1.

First, we’ll create the ZWD_SFLIGHT Web Dynpro component.



2.

Next, we create a view



So, we have a WD component and a view. Now, we can insert a
ViewContainerUIElement element in the view to show the ALV. The component’s
name must be VCU_ALV.





We can activate in this moment.
3.

In the Used Components tab of the Web Dynpro Component, we have to define
the SALV_WD_TABLE component in order to use the ALV component model within the
view.



4.

Next, we must define a Controller Usage in the COMPONENTCONTROLLER and in
the View Properties tab. To do that, press the button



.



Then, we have an ALV component as well as its controller.



5.

To show the ALV inside the View, we must embed the TABLE View of the
SALV_WD_TABLE component. Go to the Window and select the ViewContainerUIElement
(VCU_ALV) that we have created before.



6.

Then, select the next option.



7.

Now, we are ready to build the dynamic context node to give ALV its
structure.
For example purposes, we’ll
create 5 checkboxes which means the columns that can be showed (not necessary
all of them) in the ALV. In this case, we’ll use CARRID, CONNID, FLDATE, PRICE
and CURRENCY of SFLIGHT transparent table.



NOTE:
You
also have to create

a button and an event handler method where you will validate which
checkboxes are marked in order to know which fields you will show in the ALV.

8.

We have to validate checkboxes entries to know which fields we must
include in the ALV. Next code reads the context node and validates each checkbox
in order to build the structure.

******* First, read the context node: *******

DATA:

node_param                          TYPE REF TO if_wd_context_node,

elem_param                          TYPE REF TO if_wd_context_element,

stru_param                          TYPE if_v_main=>element_param .

* navigate from <CONTEXT> to <PARAM> via lead selection

node_param = wd_context->get_child_node( name = if_v_main=>wdctx_param ).

* get element via lead selection

elem_param = node_param->get_element(  ).

* get all declared attributes

elem_param->get_static_attributes(

IMPORTING

static_attributes = stru_param ).

******* Next, validate which fields you will use as ALV columns *******

DATA: ls_component TYPE cl_abap_structdescr=>component,

lr_type TYPE REF TO cl_abap_datadescr,

lt_components TYPE cl_abap_structdescr=>component_table.

IF stru_param-carrid = 'X'.

lr_type ?= cl_abap_typedescr=>describe_by_name( p_name = 'S_CARR_ID' ).

ls_component-name = 'CARRID'.

ls_component-type = lr_type .

APPEND ls_component TO lt_components.

ENDIF.

IF stru_param-connid = 'X'.

lr_type ?= cl_abap_typedescr=>describe_by_name( p_name = 'S_CONN_ID' ).

ls_component-name = 'CONNID'.

ls_component-type = lr_type .

APPEND ls_component TO lt_components.

ENDIF.

IF stru_param-fldate = 'X'.

lr_type ?= cl_abap_typedescr=>describe_by_name( p_name = 'S_DATE' ).

ls_component-name = 'FLDATE'.

ls_component-type = lr_type .

APPEND ls_component TO lt_components.

ENDIF.

IF stru_param-price = 'X'.

lr_type ?= cl_abap_typedescr=>describe_by_name( p_name = 'S_PRICE' ).

ls_component-name = 'PRICE'.

ls_component-type = lr_type .

APPEND ls_component TO lt_components.

ENDIF.

IF stru_param-currency = 'X'.

lr_type ?= cl_abap_typedescr=>describe_by_name( p_name = 'S_CURRCODE' ).

ls_component-name = 'CURRENCY'.

ls_component-type = lr_type .

APPEND ls_component TO lt_components.

ENDIF.

******* Next, create a new structure and assign it to a new dynamic context node *******

DATA:   lr_root_info TYPE REF TO if_wd_context_node_info ,

lr_node_info TYPE REF TO if_wd_context_node_info,

lr_structdescr TYPE REF TO cl_abap_structdescr.

call method cl_abap_structdescr=>create

exporting

p_components = lt_components

receiving

p_result     = lr_structdescr.

* Get context node info

lr_root_info = wd_context->get_node_info( ).

* Generate new node with the dynamic structure

CALL METHOD lr_root_info->add_new_child_node

EXPORTING

name                         = 'DATA'

is_initialize_lead_selection = abap_false

static_element_rtti          = lr_structdescr

is_static                    = abap_false

RECEIVING

child_node_info              = lr_node_info.

* get instance of new node

DATA: dyn_node TYPE REF TO if_wd_context_node.

dyn_node = wd_context->get_child_node( name = 'DATA' ).

******* Last, Get reference to model *******

DATA: lo_interfacecontroller type ref to iwci_salv_wd_table.

lo_interfacecontroller =   wd_this->wd_cpifc_alv( ).

lo_interfacecontroller->set_data( dyn_node ).

9.

Now, you need to create a Web Dynpro Application.

10.

After that, let’s run our program. We can show an ALV table with a
dynamic structure based on the checked fields.