issue in ------- dynamic ui element creation

[Former Member]

i am trying to learn dynamic programming , in due course i tried creatiing a button button and my code is like this (in modifyview method )please , tell me how to resolve the following error.........

DATA container TYPE REF TO cl_wd_uielement_container.

DATA button TYPE REF TO cl_wd_button .

IF first_time = abap_true .

container ?= view->get_element('ROOTELEMENTCONTAINER').

cl_wd_button=>new_button(

EXPORTING

• id = 'first'

text = 'First Dynamic Button'

RECEIVING

control = button ).

DATA grid_data TYPE REF TO cl_wd_grid_data.

cl_wd_grid_data=>new_grid_data(

EXPORTING

ELEMENT = button

col_span = '2'

RECEIVING

control = grid_data

).

button->set_layout_data( lr_grid_data ).

container->add_child(

EXPORTING

the_child = button

index = 1 ).

ENDIF.

this gives me following runtime error : access via null object reference is not possible .

One more thing i would like to ask , hoe to add more than one ui element as cl_wd_grid_data=>new_grid_data(

EXPORTING

ELEMENT = button

col_span = '2'

RECEIVING

control = grid_data

).

this method takes only one object.

thank you..

[arjun_thakur]

Hi Vishavdeep,

Are you using the default UI container?? If yes, then you have written the wrong spelling. It is ROOTUIELEMENTCONTAINER .

container ?= view->get_element('ROOTUIELEMENTCONTAINER').

Regards

Arjun

[Former Member]

DATA grid_data TYPE REF TO cl_wd_grid_data.

cl_wd_grid_data=>new_grid_data(
EXPORTING
ELEMENT = button
col_span = '2'
RECEIVING
control = grid_data
).

button->set_layout_data( lr_grid_data ).
container->add_child(
EXPORTING
the_child = button
index = 1 ).

lr_grid_data is not declared anywhere ?

change

DATA grid_data TYPE REF TO cl_wd_grid_data.

to

DATA lr_grid_data TYPE REF TO cl_wd_grid_data.

Greetings

Prashant