Field symbol to dynamic variable field naming

[deiamolina]

Hello all,

I am not used to field-symbols and I don't know if it's possible to do.

I need to create a node for a ALV Tree and the hierarchy changes 9 times. So, instead of create 9 loops I want to create a Perform and use the field as parameter.

case 'X'.

     when s1.

       perform tree_nodes_s1 using 'BEZEI' 'NAME1' 'VTEXT'.

     when s2.

       perform tree_nodes_s2 using 'BEZEI' 'VTEXT' ''.

.....

In the Form

loop at it_data into wa_data.

     if l_field1 is not initial.

       on change of field.

         perform add_carrid_line using wa_data   ''

                                 changing l_carrid_key.

       endon.

     endif.

So, the field need to be wa_data-bezei or wa_data-name1 or wa_data-vtext etc.

I guess that I saw it on SAP code but I really don't know how to reproduce it.

Thanks,

Andréa

[roland_spindler]

Hello Andréa,

FIELD-SYMBOLS: <l_field> TYPE ANY.

ASSIGN COMPONENT i_fieldname OF STRUCTURE wa_data TO <l_field>.

CHECK sy-subrc = 0.

Where i_fieldname is an importing parameter containing the field name. After that you can work with <l_field> like it was that field of structure wa_data.

kind regards

Roland

[deiamolina]

Hi Roland Spindler

I did that before and I thought that it was wrong because I got this same error message:

The field "<L_FIELD1>" specified under LIKE either has no type or a  generic type. type.

Code

   field-symbols: <l_field1> type any.

   assign component param1 of structure wa_data to <l_field1>.

   check sy-subrc = 0.

     loop at it_data into wa_data.

     if <l_field1> is not initial.

       on change of <l_field1>.

         perform add_carrid_line using wa_data   ''

                                 changing l_carrid_key.

       endon.

     endif.

Not sure if I can use it on 'on change of'.

do you know the right type to declare?

Thanks,

Andrea

[roland_spindler]

No, you cannot use a typeless field symbol like this, since it refers to a single variable, not to a column as in "on change of".

Try something like this:

if <l_field1> is not initial.

  if l_string <> <l_field1>.

         perform add_carrid_line using wa_data   ''

                                 changing l_carrid_key

  endif.

l_string = <l_field1>.

endif.

Roland

[deiamolina]

Hi

Thanks for all your help.

It's now ativate but the field-symbol is not being filled.

Any idea what is wrong?

Sorry for all those question but I am really lost here. Not used at all with field-symbol.

Hopefully it will be the last question

Thanks,

Andréa

[roland_spindler]

Before the loop the fields are empty of course, you just created a reference. They should be filled within the loop though. (Provided there are values in the first place.)

[deiamolina]

Ok.. I thought that it will be like wa_data-bezei and not the value.

Make sense!

Thanks