Set focus

[Former Member]

Hallo Everyone,

Which should you use to set the focus on the UI element in a view . What are the advantages and disadvantages of using the below methods?.

REQUEST_FOCUS_ON_VIEW_ELEM of IF_WD_VIEW

or

REQUEST_FOCUS of IF_WD_VIEW_CONTROLLER

[Lukas_Weigelt]

Both methods originate from the same class, they are not entirely identical but bottom line do the same. I'm not experienced enough to judge whether one's better or not, maybe Kris can tell us. Interesting question indeed.

IF_WD_VIEW --> CL_WDR_VIEW

method if_wd_view~request_focus_on_view_elem .

  data: l_view_element type ref to cl_wdr_view_element.

  l_view_element ?= view_element.
  me->view_manager->request_focus( view_element    = l_view_element
                                   context_element = context_element ).

endmethod.

IF_WD_VIEW_CONTROLLER --> CL_WDR_VIEW

method if_wd_view_controller~request_focus.

* Requests to place the UI's keyboard input focus on the UI element whose
* primary use is to edit a property bound to the given attribute. Chooses one
* such UI element in case there are several ones. It is unspecified which
* request wins in case there are several ones.
*
* The given node element is used to decide e.g. which row of a table should
* receive focus. Note that only the combination of node element and attribute
* info allows to uniquely identify an attribute instance at runtime.
*
  data: l_binding         type ref to wdr_property_binding,
        l_context_element type ref to cl_wdr_context_element,
        l_path            type string,
        l_ctrl_prefix     type string,
        l_element         type wdr_element_line.


  translate attribute to upper case.                     "#EC TRANSLANG
* get path
  l_path = cl_wd_context_services=>get_element_path_for_ctrl(
         element    = context_element
         controller = me ).
  concatenate me->name '.1.' into l_ctrl_prefix.
  replace l_ctrl_prefix in l_path with ''.
  concatenate l_path '.' attribute into l_path.
  if attribute is not initial.
    replace all occurrences of regex '\.[0-9]+\.' in l_path with '.'.
  else.
    replace all occurrences of regex '\.[0-9]+\.' in l_path with ''.
  endif.

* get bound view element
  l_context_element ?= context_element.
  loop at me->elements into l_element.
    l_binding = l_element-view_element->get__primary_property_binding( ).
    if l_binding is bound and l_binding->path_name = l_path.
      me->view_manager->request_focus( view_element    = l_element-view_element
                                       context_element = context_element ).
      exit.
    endif.
  endloop.

endmethod.

Cheers, Lukas

[Former Member]

As far as I can see, both are identical and neither works to focus an input box in the UI. The solution is described [here|]:

DATA: lr_elem TYPE REF TO if_wd_view_element.
lr_elem = view->get_element( 'INPUT_TEXT' ).
IF lr_elem IS BOUND.
  view->request_focus_on_view_elem( lr_elem ).
ENDIF.