Code Snippet Series: Pass Parameters to Web Dynpro from SAPgui

[amy_king]

This post is part of a series on code snippets. The complete list of posts in the series is available in the document Code Snippets: A Blog Series.

Two steps are needed to pass parameters into a Web Dynpro ABAP application from the SAPgui. First, the SAPgui must construct the URL of the Web Dynpro application and open the URL in a web browser. This step may be done in any ABAP routine.

   DATA lv_absolute_url TYPE string.

   DATA lv_url                TYPE char255.

   DATA ls_parameter    TYPE ihttpnvp.

   DATA lt_parameters   TYPE tihttpnvp.



 * Assemble the parameter name/value pairs as needed

   ls_parameter-name  = 'param1_name'.

   ls_parameter-value  = 'param1_value'.

   APPEND ls_parameter TO lt_parameters.



   ls_parameter-name  = 'param2_name'.

   ls_parameter-value  = 'param2_value'.

   APPEND ls_parameter TO lt_parameters.



 * Construct the URL with parameters

   cl_wd_utilities=>construct_wd_url(

       EXPORTING

           application_name = 'WEB_DYNPRO_APPLICATION_NAME'

           in_parameters      = lt_parameters

       IMPORTING

           out_absolute_ur l = lv_absolute_url

   ).



   lv_url = lv_absolute_url. " cast data type



   CALL FUNCTION 'CALL_BROWSER'

       EXPORTING

           url                    = lv_url

           window_name = 'Example: Passing Parameters'

           new_window   = abap_true

       EXCEPTIONS

           OTHERS        = 0.

 

Second, the Web Dynpro application must read the parameters from its URL query string. This is accomplished in one of two ways. Dynamic parameters must be handled by programmatically reading the parameter name/value pairs from the URL query string in the HANDLEDEFAULT event handler method of the Web Dynpro application's interface view, i.e., its window.

   DATA lt_parameters TYPE tihttpnvp.



* Read URL parameters from the query string

   wdevent->get_data(

       EXPORTING

           name =  if_wd_application=>all_url_parameters

       IMPORTING

           value = lt_parameters

   ).

Internal table LT_PARAMETERS may now be read and the parameter name/value pairs processed as needed by the application. Static parameters may also be handled in this way or may be defined at design time as importing parameters in the HANDLEDEFAULT method signature.