Link to action doesn't work in a POWL application

[Former Member]

Hi,

I have developed a web dynpro ABAP application and it is called by portal,

This WD calls standard POWL, in a POWL there is a LinkToAction field.

When I click on field the system should open a new window (shopping cart detail),

but it doesn't happen anything.

which could the problem be?

Thank you.

Best regards.

Al

[vineetrrakesh]

Hi Alberto,

You need to do the following:

1. Define an Action (corresponding to your Link to action which is typically the FIELD Name of the column in POWL Table) in your POWL feeder Implementation "IF_POWL_FEEDER~GET_ACTION" .

2. Handle the defined action in another feeder implementation "IF_POWL_FEEDER~HANDLE_ACTION".

3. Now you need to raise an portal event from the method "IF_POWL_FEEDER~HANDLE_ACTION".

4. This Portal event will be again captured in the event "POWL_FOLLOW_UP" from POWL WD component "POWL_UI_COMP"

5. You can handle this event "POWL_FOLLOW_UP" in your WD which uses "POWL_UI_COMP" and throw a pop-up from your WD component.

For more reference see thread

Hope you get your solution.

Regards

Vineet

[Former Member]

Hi Vineet,

1. Define an Action (corresponding to your Link to action which is typically the FIELD Name of the column in POWL Table) in your POWL feeder Implementation "IF_POWL_FEEDER~GET_ACTION" .

IF_POWL_FEEDER~GET_ACTION is a standard object of custom feeder class, how can I define a new Action?

2. Handle the defined action in another feeder implementation "IF_POWL_FEEDER~HANDLE_ACTION".

this code could be rigth?

METHOD if_powl_feeder~handle_action.

*

*

*

FIELD-SYMBOLS: <shopping_cart> TYPE STANDARD TABLE.

IF i_actionid = 'SELECTION'.

• triggers the event

e_portal_actions-fire_wdevent = abap_true.

• Pass parameters to event

ASSIGN c_result_tab TO <shopping_cart>.

i_shopping_cart = <shopping_cart>.

• selected row

READ TABLE c_selected INTO ls_selected INDEX y_index.

• Read selected POWL data

READ TABLE i_shopping_cart INDEX ls_selected-TABIX INTO s_shopping_cart.

CHECK sy-subrc = 0.

• Pass parameters

ls_parameter-key = 'OBJECT_ID'.

ls_parameter-value = 'I_'.

APPEND ls_parameter TO e_portal_actions-parameters.

ENDIF.

ENDMETHOD.

3. Now you need to raise an portal event from the method "IF_POWL_FEEDER~HANDLE_ACTION".

where a portal event has to be raised?

4. This Portal event will be again captured in the event "POWL_FOLLOW_UP" from POWL WD component "POWL_UI_COMP"

5. You can handle this event "POWL_FOLLOW_UP" in your WD which uses "POWL_UI_COMP" and throw a pop-up from your WD component.

it is not clear point 5.

thanks.

Best regards.

Al

[vineetrrakesh]

Hi Alberto,

1. Define an Action (corresponding to your Link to action which is typically the FIELD Name of the column in POWL Table) in your POWL feeder Implementation "IF_POWL_FEEDER~GET_ACTION" .

IF_POWL_FEEDER~GET_ACTION is a standard object of custom feeder class, how can I define a new Action?

<Vineet> See the Wiki Link http://wiki.sdn.sap.com/wiki/display/WDABAP/DocumentationInformationabout+POWL

This has a document (POWL.doc) for POWL, refer page number 20. You can use parameter C_ACTION_DEFS for explicitly defining Actions.

2. Handle the defined action in another feeder implementation "IF_POWL_FEEDER~HANDLE_ACTION".

this code could be rigth?

METHOD if_powl_feeder~handle_action.

*

*

*

FIELD-SYMBOLS: <shopping_cart> TYPE STANDARD TABLE.

IF i_actionid = 'SELECTION'.

• triggers the event

e_portal_actions-fire_wdevent = abap_true.

• Pass parameters to event

ASSIGN c_result_tab TO <shopping_cart>.

i_shopping_cart = <shopping_cart>.

• selected row

READ TABLE c_selected INTO ls_selected INDEX y_index.

• Read selected POWL data

READ TABLE i_shopping_cart INDEX ls_selected-TABIX INTO s_shopping_cart.

CHECK sy-subrc = 0.

• Pass parameters

ls_parameter-key = 'OBJECT_ID'.

ls_parameter-value = 'I_'.

APPEND ls_parameter TO e_portal_actions-parameters.

ENDIF.

ENDMETHOD.

<Vineet> Seems good provided you have defined the action name in "your class->IF_POWL_FEEDER~GET_ACTION" as 'SELECTION'.

3. Now you need to raise an portal event from the method "IF_POWL_FEEDER~HANDLE_ACTION".

where a portal event has to be raised?

<Vineet> You have alrday raised it when you used "e_portal_actions-fire_wdevent = abap_true", as above you can additionally pass parameters as you have done in pushing some data in "e_portal_actions-parameters".

4. This Portal event will be again captured in the event "POWL_FOLLOW_UP" from POWL WD component "POWL_UI_COMP"

<Vineet>Let's assume your WD component is "MY_COMP" which uses "POWL_UI_COMP". then in the component controller or View you can handle an event "POWL_FOLLOW_UP" which is a POWL Interface event. This vene has the same action "SELECTION"a nd the parameters which you have raised from "your class->IF_POWL_FEEDER~HANDLE_ACTION".

5. You can handle this event "POWL_FOLLOW_UP" in your WD which uses "POWL_UI_COMP" and throw a pop-up from your WD component.

it is not clear point 5.

<Vineet> From the event handler of "POWL_FOLLOW_UP" you can launch another webdynpro in a po-up or a new winmdow.

Please let me knwo in case you face issue.

Regards

Vineet

thanks.

Best regards.

[vineetrrakesh]

Hi Alberto,

As you need to handle through a link to action, you can ignore the GET_ACTION changes and directly start from HANDLE_ACTION but you need to check the action as below in HANDLE_ACTION.

i_action_id = 'FIELD_NAME" "Field_name is the coulmn name on whivh the Link to action elemnt is bound.

Sorry for confusion.

Regards

Vineet

[Former Member]

Hi Vineet,

very good solution, but now system gives this message

Error application is coming up.

20110127

151127

sap

http://sapportal.company.it:8888/sap/bc/webdynpro/sapsrm/wda_l_fpm_oif

OBJECTS_OBJREF_NOT_ASSIGNED_NO

Access via 'NULL' object reference not possible.

Method: PREPARE_NAVIGATION of program /1BCWDY/E68GWXQOY9IQO69T8ULI==CP

Method: MODIFY_VIEW_ASSEMBLY of program /1BCWDY/E68GWXQOY9IQO69T8ULI==CP

Method: IF_WDR_VIEW_DELEGATE~WD_INVOKE_EVENT_HANDLER of program /1BCWDY/E68GWXQOY9IQO69T8ULI==CP

Method: INVOKE_EVENTHANDLER of program CL_WDR_DELEGATING_VIEW========CP

Method: FIRE_EVENT of program CL_WDR_COMPONENT==============CP

Method: IFWDR_INTERNAL_API~RAISE_EVENT of program SAPLWDR_RG_PROXY_FACTORY

Method: IF_COMPONENTCONTROLLER~FIRE_PREPARE_NAVIGATION_EVT of program /1BCWDY/E68GWXQOY9IQO69T8ULI==CP

Method: WDDOBEFORENAVIGATION of program /1BCWDY/E68GWXQOY9IQO69T8ULI==CP

Method: IF_WDR_COMPONENT_DELEGATE~WD_DO_BEFORE_NAVIGATION of program /1BCWDY/E68GWXQOY9IQO69T8ULI==CP

Method: DO_BEFORE_NAVIGATION of program CL_WDR_DELEGATING_COMPONENT===CP

thank you.

Best regards.

Al

[vineetrrakesh]

Hi Alberto,

This Error Message is strange, I can suggest you to run program POWL_D01 to clear your POWL Cache and re-run your application. Sometimes the changes in POWL becomes incomatible with the data stored in cache.

You might need to provide your POWL Query ID as input to the report.

I am not sure but it might fix your problem. Please let me know if it doesn't fix your problem.

Regards

Vineet