Bind a static UI element with a dynamic context attribute.

[sasikiran_upadrasta]

How do I bind a static UI element (in my case, its a text view) to a context attribute that has been created dynamically ?

There will be only one instance of the node that contains this attribute !

[Former Member]

Hi,

you can bind it on creation to a dummy attribute

and when you are generating your ctx,

do on the wddomodifyview:

lo_textview = view->get_element( ).

lo_textview->bind_text( path = 'new path').

grtz,

Koen

[sasikiran_upadrasta]

I did that but I am getting the following error : Access via 'NULL' object reference not possible.

[Former Member]

Hi,

check that you gave the correct id in the get_element function,

it should be the same as you give in your layout properties

grtz,

Koen

[sasikiran_upadrasta]

yes. its the same.

[Former Member]

Hi,

what coding do you exactly put in which method?

grtz,

Koen

[sasikiran_upadrasta]

Hi, I have created a textview for CARRID and CONNID fields on the view.

In the WDDOMODIFY method, I have dynamically created the FLIGHT node. Then i have created the attributes for CARRID and CONNID for the flight node.

The coding is as follows:

METHOD wddomodifyview .

IF first_time EQ abap_true.

DATA: lr_context_node_info TYPE REF TO if_wd_context_node_info,

lr_flight_node_info TYPE REF TO if_wd_context_node_info,

lr_carrid_attr_info TYPE wdr_context_attribute_info,

lr_connid_attr_info TYPE wdr_context_attribute_info.

****************************************************************************

• Add attributes to the node of the context, dynamically

****************************************************************************

• Get reference to the context node metadata

lr_context_node_info = wd_context->get_node_info( ).

• Create a new node FLIGHT under the context node

CALL METHOD lr_context_node_info->add_new_child_node

EXPORTING

name = 'FLIGHT'

is_mandatory = abap_false

is_multiple = abap_true

is_mandatory_selection = abap_false

is_multiple_selection = abap_false

is_singleton = abap_true

is_static = abap_false

RECEIVING

child_node_info = lr_flight_node_info.

• Build attribute CARRID and add the attribute under the node FLIGHT

lr_carrid_attr_info-name = 'CARRID'.

lr_carrid_attr_info-type_name = 'S_CARR_ID'.

CALL METHOD lr_flight_node_info->add_attribute

EXPORTING

attribute_info = lr_carrid_attr_info.

• Build attribute CONNID and add the attribute under the node FLIGHT

lr_connid_attr_info-name = 'CONNID'.

lr_connid_attr_info-type_name = 'S_CONN_ID'.

CALL METHOD lr_flight_node_info->add_attribute

EXPORTING

attribute_info = lr_connid_attr_info.

****************************************************************************

• Bind the attributes to the TextView fields on the view.

****************************************************************************

*

DATA: lr_txtvw_carrid TYPE REF TO cl_wd_text_view,

lr_txtvw_connid TYPE REF TO cl_wd_text_view.

lr_txtvw_carrid ?= view->get_element( 'TXT_CARRID' ).

• lr_txtvw_carrid->bind_enabled( 'FLIGHT.CARRID' ).

lr_txtvw_carrid->set_text( value = 'AA' ).

lr_txtvw_carrid->bind_text( path = 'FLIGHT.CARRID').

lr_txtvw_connid ?= view->get_element( 'TXT_CONNID' ).

• lr_txtvw_connid->bind_enabled( 'FLIGHT.CONNID' ).

lr_txtvw_connid->set_text( value = '0107' ).

ENDIF.

ENDMETHOD.

[Former Member]

Hi,

first of all, you shouldn't change the context in wddomodify view,

do this in wddoinit or wddohandledefault.

if you want to display in textview, also set is_miltiple on the node creation on abap_false

(now you create a 0..N cardinality node)

The rest seems ok,

where exactly do you receive the null reference?

can you check st22 for that?

grtz,

Koen

[sasikiran_upadrasta]

i have changed the code that modifies the context to the wddoinit method.

again i am facing the same problem.

when i use the method bind_enabled or bind_text. i get the same error message.

on inspection of the problem in st22, i get the analysis as follows:

-

---

The exception, which is assigned to class 'CX_SY_REF_IS_INITIAL', was not caught in procedure "GET_ATTRIBUTE_INTERNAL" "(METHOD)", nor was it propagated by a RAISING clause.

The reason for the exception is:

You attempted to use a 'NULL' object reference (points to 'nothing') access a component.

An object reference must point to an object (an instance of a class) before it can be used to access components.

Either the reference was never set or it was set to 'NULL' using the CLEAR statement.

I am not understanding what exactly is the problem !!

[Former Member]

Hi,

if you debug, and it dumps on the set_text and the bind statement,

you should really check the id's

if it's only on the bind, try to use the get_path method from the attribute info

grtz,

Koen