Question Re: Context binding error in Dynamic UI element creation in Technology Q&A

Context binding error in Dynamic UI element creation

former_member781079 — Fri, 22 Aug 2014 06:55:14 GMT

Hi,

I am new to Webdynpro. I am trying to build an app for dynamic table data in an ALV,so creating an input field for table name dynamically.

I am facing a issue while binding the dynamic input field to the dynamically created context node attribute. The error description is: ERROR: Error in INPUT_FIELD "IF" of view "ZVK_DYNAMIC1.MAIN": Context binding of property VALUE cannot be resolved: The MAIN.1.INPUT node does not contain any elements (termination: RABAX_STATE).

Following is the code written in wdinit( ) method and wdmodifyview( ) method of the view controller.

METHOD wddoinit .

DATA: lr_root_node_info TYPE REF TO if_wd_context_node_info.

DATA: lr_input_node_info TYPE REF TO if_wd_context_node_info.

DATA: ls_attribute_info TYPE wdr_context_attribute_info.

lr_root_node_info = wd_context->get_node_info( ). " get the root node

CALL METHOD lr_root_node_info->add_new_child_node

EXPORTING

name = 'INPUT'

is_multiple = abap_false

is_multiple_selection = abap_false

* is_initialize_lead_selection = abap_false

RECEIVING

child_node_info = lr_input_node_info.

CLEAR ls_attribute_info.

ls_attribute_info-name = 'TABLE_NAME'.

ls_attribute_info-type_name = 'STRING'.

CALL METHOD lr_input_node_info->add_attribute

EXPORTING

attribute_info = ls_attribute_info.

ENDMETHOD.

METHOD wddomodifyview .

DATA: lr_ui_root TYPE REF TO if_wd_view_element.

DATA: lr_container TYPE REF TO cl_wd_uielement_container.

DATA: lr_input_field TYPE REF TO cl_wd_input_field.

DATA: lr_flow_data TYPE REF TO cl_wd_flow_data.

IF first_time EQ 'X'.

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

CALL METHOD cl_wd_input_field=>new_input_field

EXPORTING

* activate_access_key =

* alignment = E_ALIGNMENT-AUTO

* bind_alignment =

* bind_display_as_text =

* bind_display_only =

* bind_enabled =

* bind_ime_mode =

* bind_input_prompt =

* bind_length =

* bind_password_field =

* bind_read_only =

* bind_state =

* bind_style_class_name =

* bind_suggest_filter_method =

* bind_suggest_values =

* bind_suppress_value_help =

* bind_text_direction =

* bind_tooltip =

bind_value = 'INPUT.TABLE_NAME'

* bind_visible =

* bind_width =

* context_menu_behaviour = E_CONTEXT_MENU_BEHAVIOUR-INHERIT

* context_menu_id =

* date_picker_reference_id =

* display_as_text =

* display_only =

* enabled = 'X'

* explanation =

id = 'IF'

* ime_mode = E_IME_MODE-AUTO

* input_prompt =

* length = '20'

* multi_field_suggest =

* no_history =

* on_enter =

* on_table_paste =

* password_field =

* read_only =

* state = E_STATE-NORMAL

* style_class_name =

* suggest_filter_method =

* suggest_values =

* suppress_value_help =

* text_direction = E_TEXT_DIRECTION-INHERIT

* tooltip =

* view =

* visible = E_VISIBLE-VISIBLE

* width =

RECEIVING

control = lr_input_field.

CALL METHOD cl_wd_flow_data=>new_flow_data

EXPORTING

* cell_design = E_CELL_DESIGN-PADLESS

element = lr_input_field

* id =

* v_gutter = E_V_GUTTER-NONE

RECEIVING

control = lr_flow_data.

CALL METHOD lr_input_field->set_layout_data

EXPORTING

the_layout_data = lr_flow_data.

CALL METHOD lr_container->add_child

EXPORTING

* index =

the_child = lr_input_field.

ENDIF.

ENDMETHOD.

Please help.

Re: Context binding error in Dynamic UI element creation

Kiran_Valluru — Fri, 22 Aug 2014 07:03:27 GMT

Hi,

Check the cardinality of the node INPUT. seems you have given 1..n/1..n . use 0..n cardinality.

Regards,

Kiran

Re: Context binding error in Dynamic UI element creation

former_member781079 — Fri, 22 Aug 2014 07:09:23 GMT

Hi,

i have tried that option too(gave is_multiple = abap_true), it gives the same error while running. I guess the cardinality should be 1..1 because this node INPUT is used for taking the table name through the attribute TABLE_NAME.

Re: Context binding error in Dynamic UI element creation

ramakrishnappa — Fri, 22 Aug 2014 07:19:08 GMT

Hi Vishal,

Actually, for an input field the node should be with cardinality either 1...1 / 1...n. i.e. at least one element should exist. So you need to pass "is_mandatory = abap_true" while creating node.

Please modify your code as below

CALL METHOD lr_root_node_info->add_new_child_node

EXPORTING

name = 'INPUT'

is_mandatory = abap_true

is_multiple = abap_false

is_multiple_selection = abap_false

* is_initialize_lead_selection = abap_false

RECEIVING

child_node_info = lr_input_node_info.

Hope this helps you.

Regards,

Rama

Re: Context binding error in Dynamic UI element creation

former_member781079 — Fri, 22 Aug 2014 07:24:21 GMT

It worked..Thanks a lot. But i have one doubt when we add a context node statically, the UI element is created properly with the dynamic binding.

Re: Context binding error in Dynamic UI element creation

Kiran_Valluru — Fri, 22 Aug 2014 07:26:04 GMT

Hi,

For table you have to use 0..n/1..n cardinality. But here, in your example, you are not using a table, you are just creating one input field and binding it to a context node with 0..n cardinality!!

Create a table and then bind the table to the context node, then create a column with cell editor as input field and then bind it to the respective attribute

You can check this doc as reference:

Regards,

Kiran

Re: Context binding error in Dynamic UI element creation

former_member781079 — Fri, 22 Aug 2014 07:30:16 GMT

I am passing abap_false to parameter is_multiple. I got the problem now, seems like an element is created only when we pass is_mandatory = abap_true which is required for binding.

Re: Context binding error in Dynamic UI element creation

ramakrishnappa — Fri, 22 Aug 2014 07:35:22 GMT

Hi Vishal,

You are welcome

The node can be made as static, where no further changes allowed to the node definition.

Regards,

Rama