Dynamic Creation of Context Nodes

Hi everybody,
I'm struggling with the following code.
public void wdDoInit()
    //@@begin wdDoInit()
          IPrivateTestView.IPersonNode personNode = wdContext.nodePerson();
          IPrivateTestView.IPersonElement personElement = personNode.createPersonElement();
          personElement.setText("John");
          personNode.getNodeInfo().addAttribute("selected_0", "ddic:com.sap.dictionary.boolean");
          personElement.setAttributeValue("selected_0", new Boolean(true));
          personNode.addElement(personElement);
          personNode = wdContext.nodePerson();
          personElement = personNode.createPersonElement();
          personElement.setText("Walter");
          personNode.getNodeInfo().addAttribute("selected_1", "ddic:com.sap.dictionary.boolean");
          personElement.setAttributeValue("selected_1", new Boolean(true));
          personNode.addElement(personElement);
    //@@end
public static void wdDoModifyView(IPrivateTestView wdThis, IPrivateTestView.IContextNode wdContext, com.sap.tc.webdynpro.progmodel.api.IWDView view, boolean firstTime)
    //@@begin wdDoModifyView
          IWDTransparentContainer tc = (IWDTransparentContainer) view.getElement("container");
          IWDCheckBox cb0 = (IWDCheckBox) view.createElement(IWDCheckBox.class, "cb_0");
          IWDCheckBox cb1 = (IWDCheckBox) view.createElement(IWDCheckBox.class, "cb_1");
          IPrivateTestView.IPersonElement personElement = (IPrivateTestView.IPersonElement) wdContext.nodePerson().getElementAt(0);
          cb0.bindChecked(personElement.getAttributePointer("selected_0").getAttributeInfo());
          tc.addChild(cb0);
          personElement = (IPrivateTestView.IPersonElement) wdContext.nodePerson().getElementAt(1);
          cb1.bindChecked(personElement.getAttributePointer("selected_1").getAttributeInfo());
          tc.addChild(cb1);
    //@@end
Context's structure is as follows:
- Person (cardinality: 0..n; selection:0..n)
- Text   (String)
I cannot figure out why, when the program runs, it renders 2 checkboxes but only the first one is checked.
The second checkbox should be checked off as well since its checked property is bound to the attribute selected_1 which is set to true.
Thanks in advance.
Marco

Hi,
As per my understanding you are trying to create group of check boxes dynamaically and all check boxes should work independent of each other. Please try the following code, I have modified your code:
- Change the cardinality of the Peron node to 1..1
public void wdDoInit()
    //@@begin wdDoInit()
     IPrivateTestComponentView.IPersonNode personNode = wdContext.nodePerson();
     IPrivateTestComponentView.IPersonElement personElement = personNode.currentPersonElement();
     //personElement.setText("John");
     personNode.getNodeInfo().addAttribute("selected_0", "ddic:com.sap.dictionary.boolean");
     personElement.setAttributeValue("selected_0", new Boolean(true));
     personNode.getNodeInfo().addAttribute("text_0", "ddic:com.sap.dictionary.string");
     personElement.setAttributeValue("text_0","John");
     //personNode.addElement(personElement);
     //personNode = wdContext.nodePerson();
     //personElement = personNode.createPersonElement();
     //personElement.setText("Walter");
     personNode.getNodeInfo().addAttribute("selected_1", "ddic:com.sap.dictionary.boolean");
     personElement.setAttributeValue("selected_1", new Boolean(true));
     personNode.getNodeInfo().addAttribute("text_1", "ddic:com.sap.dictionary.string");
     personElement.setAttributeValue("text_1","Walter");
     //personNode.addElement(personElement);
    //@@end
public static void wdDoModifyView(IPrivateTestComponentView wdThis, IPrivateTestComponentView.IContextNode wdContext, com.sap.tc.webdynpro.progmodel.api.IWDView view, boolean firstTime)
    //@@begin wdDoModifyView
    if(firstTime)
     IWDTransparentContainer tc = (IWDTransparentContainer) view.getElement("container");
     IWDCheckBox cb0 = (IWDCheckBox) view.createElement(IWDCheckBox.class, "cb_0");
     IWDCheckBox cb1 = (IWDCheckBox) view.createElement(IWDCheckBox.class, "cb_1");
     //IPrivateTestComponentView.IPersonElement personElement = (IPrivateTestComponentView.IPersonElement) wdContext.nodePerson().getElementAt(0);
     cb0.bindChecked(wdContext.nodePerson().getNodeInfo().getAttribute("selected_0"));
     cb0.bindText(wdContext.nodePerson().getNodeInfo().getAttribute("text_0"));
     tc.addChild(cb0);
     //personElement = (IPrivateTestComponentView.IPersonElement) wdContext.nodePerson().getElementAt(1);
     cb1.bindChecked(wdContext.nodePerson().getNodeInfo().getAttribute("selected_1"));
     cb1.bindText(wdContext.nodePerson().getNodeInfo().getAttribute("text_1"));
     tc.addChild(cb1);
    //@@end
Here I have used 1..1 cardinaltiy node and created all attributes dynamically.
Regards
Abhilash

Similar Messages

Dynamic creation of context nodes and ui elements

Hi,
I have created context nodes dynamically. And i also want to create UI elements dynamically wherein i want to bind the attribute from the context node to it. For example i want to create a drop down by index and bind one of the attributes in the context nodes that i have earlier created dynamically to it. I do not know how to get the path to the attribute as i get IF_WD_CONTEXTNODE_INFO when i say get_child_node(). And the IF_WD_CONTEXTNODE_INFO does not have any method where in i can get IF_WD_CONTEXT_NODE from where i can get the path by get_meta_path( )
Here is the code. The problem is to get the path which is the i/p to cl_wd_dropdown_by_idx=>new_dropdown_by_idx( ) method.
DATA:
 lo_root_ui_elmnt TYPE REF TO cl_wd_uielement_container,
 lo_drpdwn_by_idx TYPE REF TO cl_wd_dropdown_by_idx,
 lo_txt_vw TYPE REF TO cl_wd_text_view,
 lo_qstn_node TYPE REF TO if_wd_context_node,
 lo_optn_node_info TYPE REF TO if_wd_context_node_info,
 lv_optn_data_source_name TYPE string,
 lt_child_nodes TYPE wdr_context_child_map,
 lo_qstn_el TYPE REF TO if_wd_context_element,
 lo_optn_el TYPE REF TO if_wd_context_element,
 lv_text TYPE string,
 lo_qstn_node_info TYPE REF TO if_wd_context_node_info.
FIELD-SYMBOLS:
* <ls_qstn> LIKE LINE OF wd_this->mt_questions.
 <ls_child_node> LIKE LINE OF lt_child_nodes.
lo_root_ui_elmnt ?= io_view->get_root_element( ).
lt_child_nodes = wd_context->get_child_nodes( ).
LOOP AT lt_child_nodes ASSIGNING <ls_child_node>.
 lo_qstn_node = <ls_child_node>-node.
 lo_qstn_el = lo_qstn_node->get_element( index = 1 ).
 lo_qstn_el->get_attribute(
 EXPORTING
 name = 'QUESTION_TEXT'
 IMPORTING
 value = lv_text ).
 lo_txt_vw = cl_wd_text_view=>new_text_view( view = io_view ).
 lo_txt_vw->set_text( value = lv_text ).
 lo_qstn_node_info = lo_qstn_node->get_node_info( ).
 lo_optn_node_info = lo_qstn_node_info->get_child_node( 'OPTIONS' ).
* lv_optn_data_source_name = lo_optn_node_info->get_meta_path( withoutcontroller = abap_true ).
* CONCATENATE lv_optn_data_source_name '.' 'OPTION_TEXT' INTO lv_optn_data_source_name.
 lo_drpdwn_by_idx = cl_wd_dropdown_by_idx=>new_dropdown_by_idx(
 bind_texts = lv_optn_data_source_name
 view = io_view ).
 lo_root_ui_elmnt->add_child( lo_txt_vw ).
 lo_root_ui_elmnt->add_child( lo_drpdwn_by_idx ).
ENDLOOP.
Regards,
Madhura Lobo
Edited by: Suhas Saha on Aug 2, 2011 11:04 AM

Hi Madhura,
Please check this thread and find Baskaran answer...
create new child-node in supply-function
Re: Creating Dynamic Node and Table
Cheers,
Kris.

Reg: Dynamic creation of context

Hi,
I have a value node Vn_node and one value attribute Va_att and i have binded it a table.
I have another node Vn_node1 and attribute for this is Va_att1,
based on the size of Vn_node1, i need to create value attributes in Vn_node of type checkbox and bind it to the table and the header text should be corresponding Va_att1.
Kindly suggest.
Regards,
Prasanthi.

For Dynammically creating Context use the following code:
Ctx_bool1 is a context whose property is checked and it is set true and Context added to the node of type string.( you can change its type).
Added code in OnActionget:
if(!wdContext.currentContextElement().getCtx_bool1())
wdContext.currentContextElement().setCtx_bool1(true);
wdContext.getNodeInfo().addAttribute("nameValue","ddic:com.sap.dictionary.string");
In wddomodifyView:
You can bind the context attribute to a field or so shown and add it to RootContainer.
Field is created.
IWDInputField input = (IWDInputField)view.createElement(IWDInputField.class,"nameField");
Binding of field to the context.
input.bindValue("nameValue");
Adding it to RootContainer.
IWDTransparentContainer c = (IWDTransparentContainer)view.getElement("RootUIElementContainer");
c.addchild(input).
I hope this wud help you as you would be able to create a context dynammically and bind it with field.
Thanx.

Dynamic creation of xml node

Hi there
I can't quite figure out how to add a node based on a passed
variable value
If I hard code it as can be seen in the line of code
commented out - it works.
But if I try to pass a string, it doesn't work
public function addNodeToXML(passedNodeName:String):void {
//_qualificationSummaryScreenXML.appendChild(<pupil
/>);
_qualificationSummaryScreenXML.appendChild(passedNodeName);
This is the call to the function
addNodeToXML("<pupil />");
Would be very grateful if someone can help me fix this
Thanks
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Hi Suman,
I would suggest that you ask questions about ABAP WD in the forum for ABAP WD.
Kind regards,
Ulrich

Dynamic Context Node Copying question

I am trying to dynamically copy some context nodes from my component controller to the view controller. In the source context, I have a node whose "Multiple" property is set to true.
I use the function addMappedChild to copy the attribute info, but the copied node always has "Multiple" set to false!! In the definition of addMappedChild there is no paramter for "Multiple". How do I do this?
Thanks
Walter
public IWDNodeInfo addMappedChild(java.lang.String name,
                                  java.lang.Class elementClass,
                                  boolean singleton,
                                  boolean mandatorySelection,
                                  boolean multipleSelection,
                                  java.lang.String mappedPath,
                                  boolean selectionMapped,
                                  boolean initializeLeadSelection)

Are you making like dscribed here
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/webdynpro/dynamically creating, building, and mapping a context in web dynpro.pdf
page 14?
Best Regards, Maxim r.

Using Search Help with ALV and Dynamic context node

The topic subject already describes my situation.
I have to create, populate and remove context nodes at runtime, and bind them to an ALV, to let user display the data or modify the data. The nodes I create are always typed with a table name, but the table name is of course, dynamic.
This is all working: what's not working is help for entries inside the ALV; since the table has foreign keys and domains with check tables or fixed values, I expected that search helps were detected and managed by the framework.
Instead, no help search is displayed except the input help based on data-type of the one "Date" input fields.
I think I have to work on the dynamic node creation, and not on the ALV itself, since the latter only takes the node/attributes information, but i could be wrong. I tried with both the two following codings:
CALL METHOD lo_nd_info_root->add_new_child_node
    EXPORTING
      static_element_type          = vs_tabname
      name                         = 'SAMPLE_NODE_NAME'
*    is_mandatory                 = abap_false
*    is_mandatory_selection       = abap_false
     is_multiple                  = abap_true
     is_multiple_selection        = abap_false
*    is_singleton                 = abap_false
      is_initialize_lead_selection = abap_false
      is_static                    = abap_false
    RECEIVING
      child_node_info              = lo_nd_info_data .
cl_wd_dynamic_tool=>create_nodeinfo_from_struct(
      parent_info = lo_nd_info_root
      node_name = 'SAMPLE_NODE_NAME'
      structure_name = vs_tabname
      is_multiple = abap_true ).
The result is the same...is there any way to let the ALV know what search helps it has to use, and doesn't force me to manually build a VALUE_SET to be bound on the single attributes? There are many tables, with many fields, and maintaining this solution would be very costly.

I have checked with method GET_ATTRIBUTE_VALUEHELP_TYPE of interface IF_WD_CONTEXT_NODE_INFO, on an attribute which i know to have a search help (Foreign key of a check table).
The method returns 'N', that is the constant IF_WD_VALUE_HELP_HANDLER~CO_VH_TYPE_NO_HELP. So, the framework was not able to find a suitable search help.
Using method GET_ATTRIBUTE_VALUE_HELP of the same interface, on the same attribute, returns me '111', which is constant C_VALUE_HELP_MODE-AUTOMATIC.
Therefore, the WD framework knows it has to automatically detect a value help, but fails to find one.
Also, this means in my opinion that the ALV and the dynamic external mapping are not the culprits: since node creation, no help is detected for any attribute but the date. Honestly, I don't have a clue on what's happening.

Error creating dynamic context node in Webdynpro for ABAP. Plesae help!

Hi
   I am getting the following error while creating a dynamic context node with 2 attributes. Please help me resolve this problem.
Note
The following error text was processed in the system PET : Line types of an internal table and a work area not compatible.
The error occurred on the application server FMSAP995_PET_02 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: IF_WD_CONTEXT_NODE~GET_STATIC_ATTRIBUTES_TABLE of program CL_WDR_CONTEXT_NODE_VAL=======CP
Method: GET_REF_TO_TABLE of program CL_SALV_WD_DATA_TABLE=========CP
Method: EXECUTE of program CL_SALV_WD_SERVICE_MANAGER====CP
Method: APPLY_SERVICES of program CL_SALV_BS_RESULT_DATA_TABLE==CP
Method: REFRESH of program CL_SALV_BS_RESULT_DATA_TABLE==CP
Method: IF_SALV_WD_COMP_TABLE_DATA~MAP_FROM_SOURCE_DATA of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMP_TABLE_DATA~MAP_FROM_SOURCE of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMP_TABLE_DATA~UPDATE of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_VIEW~MODIFY of program CL_SALV_WD_C_TABLE_V_TABLE====CP
Method: IF_SALV_WD_COMPONENT~VIEW_MODIFY of program CL_SALV_WD_A_COMPONENT========CP
My code is like the following:
TYPES: BEGIN OF t_type,
            CARRID TYPE sflight-carrid,
            CONNID TYPE sflight-connid,
         END OF t_type.
Data: i_struc type table of t_type,
dyn_node   type ref to if_wd_context_node,
rootnode_info   type ref to if_wd_context_node_info,
i_node_att type wdr_context_attr_info_map,
wa_node_att type line of wdr_context_attr_info_map.
      wa_node_att-name = 'CARRID'.
      wa_node_att-TYPE_NAME = 'SFLIGHT-CARRID'.
      insert wa_node_att into table i_node_att.
      wa_node_att-name = 'CONNID'.
      wa_node_att-TYPE_NAME = 'SFLIGHT-CONNID'.
      insert wa_node_att into table i_node_att.
clear i_struc. refresh i_struc.
select carrid connid into corresponding fields of table i_struc from sflight where carrid = 'AA'.
rootnode_info = wd_context->get_node_info( ).
rootnode_info->add_new_child_node( name = 'DYNFLIGHT'
                                   attributes = i_node_att
                                   is_multiple = abap_true ).
dyn_node = wd_context->get_child_node( 'DYNFLIGHT' ).
dyn_node->bind_table( i_struc ).
l_ref_interfacecontroller->set_data( dyn_node ).
I am trying to create a new node. That is
CONTEXT
- DYNFLIGHT
CARRID
CONNID
As you see above I am trying to create 'DYNFLIGHT' along with the 2 attributes which are inside this node. The structure of the node that is, no.of attributes may vary based on some condition. Thats why I am trying to create a node dynamically.
Also I cannot define the structure in the ABAP dictionary because it changes based on condition

Ok, I think I found a bug... It seems for adobe forms in WD4A, the root context node must be 1-1 and you must nest the 1-n node within that... Not sure why, but it worked. So in my case my context would look like this:
FOO_NODE (1-1)
     Widget (1-N)
          -Widget_info (1-1)
               *Name
               *Sku
               *Description
          -Widget_plant (1-M)
               *Plant_Code
               *Plant_State
               *Plant_City
          -Widget_pic (1-1)
               *Picture

Adding dynamic attributes to static context node

Hi All,
I have defined a context node LINES with several attributes. This is done staticly during developmenttime.
During run-time node LINES is extended with several attributes dynamicly. See below:
10 HEADER_GUID ->
11 DETAIL_GUID ->
12 EXTERNAL_ID ->
13 OBJECT_TYPE ->
14 IN_OUT_PLAN ->
15 TRAFFIC_LIGHT_1 ->
16 TRAFFIC_LIGHT_2 ->
17 TRAFFIC_LIGHT_3 ->
18 TRAFFIC_LIGHT_4 ->
19 _LOCATION \TYPE=STRING ->
20 _ZZTOPGROUPING \TYPE=STRING ->
21 _STATUS \TYPE=STRING ->
22 _100000200 \TYPE=STRING ->
19..22 are added dynamicly.
I have an internal table that matches de new context. This <fs_tb_tree_new> I want to bind like:
*&- bind table
lr_node->bind_table( new_items = <fs_tb_tree_new>
 set_initial_elements = abap_true ).
In <fs_tb_tree_new> the dynamicly added attrbutes contains values e.g. (the static attributes also have values via <fs_tb_tree_new>):
 _LOCATION _ZZTOPGROUPING _STATUS _100000200
5 Africa 0002 Reporting Entity 0.000
6 Russia, CIS 0003 Identify 0.000
An ALV presents the values of the attribute. But.... only the values of the static part are presented, not the dynamic attributes added during runtime.
Please advise what I forget or do wrong .
Thanks in advance.
John

I solved the issue:
If you use a combination of static attributes added with dynanic attributes (during runtime) for dynamic ALV, I advise to create a new node and bind the values to this new created node:
Cheers, John
wd_this->extend_context( EXPORTING im_struc_descr = lr_cl_abap_structdescr
 IMPORTING ex_node = lr_node_alv ).
Method:
*&- Create new dynamic context LINES_DYN
Node for alv-table
lr_node_info = wd_context->get_node_info( ).
CALL METHOD lr_node_info->add_new_child_node
 EXPORTING
 name = 'LINES_NEW'
 static_element_rtti = im_struc_descr
 is_static = abap_true
 is_multiple = abap_true
 is_multiple_selection = abap_false
 RECEIVING
 child_node_info = lr_subnode_info.
lr_node = lr_subnode_info->get_parent( ).
lr_node = wd_context->get_child_node( 'LINES_NEW' ).
ex_node = lr_node.
*&- bind table for alv
lr_node_alv->bind_table( new_items = <fs_tb_tree_new>
 set_initial_elements = abap_true ).

ABAP: dynamic context node + attribute for DROP_DOWN_BY_KEY

Hello,
I need to create a Node with attributes dynamically and than assign it to a DROP_DOW_BY_KEY element in ABAP.
I create drop down this way:
drop_down_figure = cl_wd_dropdown_by_key=>new_dropdown_by_key( bind_selected_key = 'REPOSITORY.FIGURES' on_select = 'GET_OPERATOR' ).
cl_wd_grid_data=>new_grid_data( element = drop_down_figure ).
ui_container->add_child( drop_down_figure ).
However, here I bind to REPOSITORY.FIGURES. Instead of doing this I need to bind it to an attribute that I create.
I can access wd_context but I am not sure how to create a node in wd_context, then attribute for that node that will contain items for drop down.
bind_selected_key is type of String. If I create a node with attribute how do I cast it to a String so I can pass it to a constructor of a drop down?
Thank you.

Hi Georgy,
There is a 3 - series weblog for this.
The first one is:
/people/thomas.szcs/blog/2005/12/28/dynamic-programming-in-web-dynpro-abap--introduction-and-part-i-understanding-ui-elements
The following are the the general steps for creating a node and table where table name is input by the user:
DATA:
UI Elements
 group_1 TYPE REF TO cl_wd_uielement_container,
 new_tab TYPE REF TO cl_wd_table,
Context Nodes
 dyn_node TYPE REF TO if_wd_context_node,
 tabname_node TYPE REF TO if_wd_context_node,
Node Info
 rootnode_info TYPE REF TO if_wd_context_node_info,
Data Reference (for internal table)
 stru_tab TYPE REF TO data,
String (for table name)
 tablename TYPE string.
FIELD-SYMBOLS:
 <tab> TYPE table.
1) * get node info of context root node
rootnode_info = wd_context->get_node_info( ).
2) * create sub node named TEST1 of structure (tablename)
cl_wd_dynamic_tool=>create_nodeinfo_from_struct(
 parent_info = rootnode_info
 node_name = tablename
 structure_name = tablename
 is_multiple = abap_true ).
3) * get instance of new node
dyn_node = wd_context->get_child_node( name = tablename ).
4) ***** create new UI element table *******************************************************
new_tab = cl_wd_dynamic_tool=>create_table_from_node(
ui_parent = group_1
table_id = 'TESTTAB'
node = dyn_node ).
5) ***** fill context node with data *******************************************************
create internal table of (tabletype)
CREATE DATA stru_tab TYPE TABLE OF (tablename).
ASSIGN stru_tab->* TO <tab>.
Get table content
SELECT * FROM (tablename) INTO CORRESPONDING FIELDS OF TABLE <tab>.
Bind internal table to context node.
dyn_node->bind_table( <tab> ).
Regards,
Srini.

How to delete a dynamically created context node ?

Hi
I have created a context node dynamically and have added the check boxes to the node.
But when i am refreshing the page it is giving me the following excepiton:
com.sap.tc.webdynpro.progmodel.context.ContextException: DataNodeInfo(DwdReportView.Person): duplicate name for attribute attr1
I am writing the following code in wdDoExit() method so that the node is invalidated and all dynamically added nodes and attributes are destroyed from the metadata.
The code is :
     wdContext.getContext().reset(false);
or
     wdContext.getContext().reset();
or
                     wdContext.nodeName().invalidate();
I have tried all the above mentioned code snippets but it is still giving me the same exception.
Please help me resolve this issue.
Thanks in advance.
Regards
Shaily

Shally,
A better forum to place your question is the forum.
To your question: the wdDoExit() method is only called once i.e. when the view is destroyed from memory. Just like the wdDoInit() mehtod is called only once at initialisation of the view.
Try refactoring your code, so that upon initialising of your context, the old version of it is removed.
Hope this helps.
Regards,
Alain

Dynamic reverse context node mapping at runtime

Hi!
I have an application which uses another embedded component containing a ALV table which shows the data of a transparent table.
Everything works fine if i'm working with a static table with static attributes and map the context node of the application to the node in the embedded component. The context node in the embedded component is reversed mapped and gets its data from the application's context node.
Now i want to do it dynamically. Inside the application the user should choose the name of a table and I'm using RTTI functions to get it's technical informations. At runtime i'm adding dynamically attributes (i.e. fieldname, type, length) to a static context node called 'DATA'.
The ALV component of the embedded component is mapped to an interface context node named 'DATA' which uses reverse mapping to receive data from the applications context node 'DATA'.
What I need to know is how to create the mapping between application context node and interface context node of the embedded component at runtime after i have created the attributes of the node dynamically. Is that basically possible?
I've already tried to map the both nodes statically to see if the dynamically created attributes are mapped automatically then. The mapping seems to be fine at node level, but doesn't work for the later dynamically added attributes.
Could someone point me to informations if dynamic mapping context nodes is basically possible and how to do it?
Regards
Ralf-J.

Hi Lars!
Thanks for the link! The problem isn't to fill the context node dynamically. That's already working using RTTI etc.
It seems to me that the interface context node of the ALV in the embedded component doesn't recognize the dynamically added attributes. As i wrote the binding on node level (DATA->DATA), which i'm doing at design time, is working as expected, but the added attributes are only shown in the context node of the using component but not in the embedded.
I'm still thinking there must be a way to do a binding at runtime. On the other hand the comment of Glenn in the thread you've pointed me to, seems to suggest that the ALV itself might have problems with dynamically appended attributes.
Regards
Ralf-J.

Dynamic creation of ItemListBox and binding a child node

Hello @all,
I have the following context structure
root
--category
-- --report
-- -- --id
-- -- --name
-- --id
-- --name
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Now I want on an onAction-Event of a Button, that for every category an itemListBox will be created with the according report names. the creation of the itemList is not the problem, but the binding of the datasource and/or the descriptivetext.
my code:
public void initItemListBox( )
 //@@begin initItemListBox()
 IWDView view = wdContext.currentContextElement().getSelectView();
 IWDGroup group = (IWDGroup) view.getElement("ItemListGroup");
 if (group.hasChildren())
 group.removeAllChildren();
 for (int i = 0; i < wdContext.nodeCategory().size(); i++)
 ICategoryElement catEl = wdContext.nodeCategory().getCategoryElementAt(i);
 wdContext.nodeCategory().setLeadSelection(i);
 generateItemLists(wdContext.currentContextElement().getSelectView(), wdContext, catEl);
 //@@end
public void generateItemLists( com.sap.tc.webdynpro.progmodel.api.IWDView view, de.mgi.portaldev.bc.mdw.msi.wdp.IPrivateCRSReportView.IContextNode wdContext, de.mgi.portaldev.bc.mdw.msi.wdp.IPrivateCRSReportView.ICategoryElement category )
 //@@begin generateItemLists()
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 IWDGroup group;
 IWDGroup catGroup;
 IWDLabel label;
 String groupId = "group_" + category.getName();
 catGroup = (IWDGroup) view.createElement(IWDGroup.class, groupId);
 IWDMatrixLayout matrLayout = (IWDMatrixLayout) catGroup.createLayout(IWDMatrixLayout.class);
 String labelId = "label_" + category.getName();
 label = (IWDLabel) view.createElement(IWDLabel.class, labelId);
 label.setText(category.getName());
 IWDMatrixData layout = (IWDMatrixData) label.createLayoutData(IWDMatrixData.class);
 layout.setVAlign(WDCellVAlign.TOP);
 String itemListId = "itemList_" + category.getName();
 IWDItemListBox itemListBox = (IWDItemListBox) view.createElement(IWDItemListBox.class, itemListId);
 label.setLabelFor(itemListId);
 IWDMatrixData itemlayout = (IWDMatrixData) itemListBox.createLayoutData(IWDMatrixData.class);
 itemListBox.bindDescriptiveText("crsReporting.category.report.name");
 IWDNodeInfo reportNodeInfo = category.nodeReport().getNodeInfo();
// itemListBox.bindText(reportNodeInfo.getAttribute("name"));
 itemListBox.setVisibleItems(5);
 IWDMatrixHeadData matrixHead = (IWDMatrixHeadData) itemListBox.createLayoutData(IWDMatrixHeadData.class);
 IWDAction itemListAct = (IWDAction) wdThis.wdGetItemSelectAction();
 itemListBox.setOnLeadSelect(itemListAct);
// itemListBox.bindDataSource(reportNodeInfo);
 itemListBox.bindDataSource("crsReporting.category.report");
 catGroup.addChild(label);
 catGroup.addChild(itemListBox);
 group = (IWDGroup) view.getElement("ItemListGroup");
 group.addChild(catGroup);
 // END ITEMLIST
 //@@end
What am I doing wrong? in every ItemListbox there are only the report names of the last category.
thanks.

RowRepeater is available in WD Java since NW CE (7.1). With RowRepeater, the solution is trivial and can be done completely by declaration in view designer.
In earlier releases, you can solve it as follows (non-trivial)
- For each category, create a separate context node "Category_i" with an attribute "name"
- Inside each category node, create a non-singleton node "Reports" with an attribute "name"
- Foreach report, add a node element to the reports subnode of its category node element
All this has to be done using the generic context API.
On each change of the data, reset the context and re-create these nodes.
In wdDoModifyView(), check if data have changes and create UI elements programmatically.
- For each category, create a group, bind header text to category name.
- Inside each group, create a ItemListBox, bind "dataSource" to reports sub-node of category (non-singleton!) and bind "text" to text attribute of report node.
Sample code:
To build context structure:
private void createCategories()
 for (int i = 0; i < 3; ++i)
 IWDNodeInfo categoryNodeInfo = wdContext.getNodeInfo().addChild("Category" + i, null, true, CMICardinality.ONE, CMICardinality.ONE, true, null);
 IWDAttributeInfo att = categoryNodeInfo.addAttribute("name", "ddic:com.sap.dictionary.string");
 IWDNode categoryNode = wdContext.getChildNode(categoryNodeInfo.getName(), 0);
 categoryNode.getElementAt(0).setAttributeValue(att.getName(), "Category #" + i);
 IWDNodeInfo reportNodeInfo = categoryNodeInfo.addChild("Reports", null, false, CMICardinality.MANY, CMICardinality.ZERO_TO_ONE, true, null);
 IWDAttributeInfo attReportName = reportNodeInfo.addAttribute("name", "ddic:com.sap.dictionary.string");
 IWDNode reportNode = categoryNode.getChildNode("Reports", 0);
 for (int j = 0; j < 5; ++j)
 IWDNodeElement report = reportNode.createAndAddElement();
 report.setAttributeValue("name", "Report #" + j);
To recreate UI:
if (<data_have_changed>)
 IWDTransparentContainer root = (IWDTransparentContainer) view.getRootElement();
 for (int i = 0; i < 3; ++i)
 IWDNode categoryNode = wdContext.getChildNode("Category" + i, 0);
 IWDAttributeInfo attName = categoryNode.getNodeInfo().getAttribute("name");
 IWDGroup group = view.createElement(IWDGroup.class);
 root.addChild(group);
 IWDCaption header = view.createElement(IWDCaption.class);
 group.setHeader(header);
 header.bindText(attName);
 IWDNode reportsNode = categoryNode.getChildNode("Reports", 0);
 IWDAttributeInfo attReportName = reportsNode.getNodeInfo().getAttribute("name");
 IWDItemListBox list = view.createElement(IWDItemListBox.class);
 group.addChild(list);
 list.bindDataSource(reportsNode.getNodeInfo());
 list.bindText(attReportName);
Armin
Fixed code tags

Creating context node dynamically in web dynpro for java

Hi
I am having requirement where user can ask for 3 tables . I have created tables dynamically. But now i want that context node should also be created dynamically.
Thanks and Regards,
Saurabh

Hello Saurabh,
Refer the below link:
http://wiki.sdn.sap.com/wiki/display/WDJava/DynamicUIGeneration.
There is a section Dynamically Building the Context. Please refer to that.
There are lots of things available in SDN for the same.
Regards
Nizamudeen SM

To access a dynamic context node defined in a Used Component

Hi Gurus,
I need your help with something.
I have a dynamic context node in ComponentA. I want it in Component B too.
Component B uses Component A, but I am not able to get access to the context node.
Is it possible to do this? Any suggestions how to proceed.
PS: I am trying to do a dynamic mapping. The initial scenario was here, Set data into Model Node on Navigating from a View
Thanks in advance,
Anjana R.
Message was edited by:
Anjana Raghav

Hi Gurus,
Its working now. Earlier, the code was something like this....
IWDNodeInfo compNode = wdThis.wdGetCompInterface().wdGetAPI().getContext().getRootNodeInfo().getChild(nodeNm);
viewNodeInfo.setMapping(compNode,true);
and was trying to map it using
iewNodeInfo.addMappedAttribute("order",".Comp."+ nodeNm + ".order");
Now, I am mapping like this.
viewNodeInfo.addMappedAttribute("order","order");
Thanks,
Anjana R.

How to access the structure of a dynamically created context node/element

Hi All,
in method wddoinit I have added a context node and some attributes
lo_node = wd_context->get_child_node( name = wd_this->wdctx_instructors ).
lo_node_info = lo_node->get_node_info( ).
lo_node_info = lo_node_info->add_new_child_node( name                  = 'OCCUPANCY'
                                                   is_mandatory          = abap_true
                                                   is_multiple           = abap_false
                                                   is_multiple_selection = abap_false ).
      lo_node_info->add_attribute( ls_attr ).
So far, I have node INSTRUCTORS (0...n) with a subnode OCCUPANCY (1...1)
In the supply_method of INSTRUCTORS I would like to fill the instructors node and the OCCUPANCY subnode.
The thing is I do not know the structure of the dynamicaly created subnode OCCUPANCY there. How can I get a description of this node (that, what in non-dynamic programming would be wd_this->element_occupancy...)??
THANKS,
Johannes

...I got this one solved by myself...
I simply added this coding:
lo_node_info = lo_node->get_node_info( ).
lt_attributes = lo_node_info->get_attribute_names( ).
This appers to be enough information to be good to gogo
Thanks anyway.

Dynamic Creation of Context Nodes

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