How to read AVL layout dynamicaly

[Former Member]

Hi All there,

I have a requirement that I have to change the ALV layout at runtime by providing some push button.once the push button pressed I have to refresh the layout.

I got the methods get_frontend_fieldcatlog by which I can read the layout and set_frontend_fieldcatlog bothe belongs to class cl_gui_alv_grid.

Can anybody provide me sample code or anyother option to do this.

Regards

Sagar

[MarcinPciak]

I think you already have all the logic you need. Where is the problem then?

If this is just a matter of "where to place the code" please just pick any document regarding ALV ( i.e [this|http://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/e8a1d690-0201-0010-b7ad-d9719a415907] ) and read how to handle event user_command and in the handling method simply use mentioned methods to change the ALV, then refresh it.

Regards

Marcin

[Former Member]

Hi Mercin,

Thanks for your reply, If I skip the part user-commnad for time being I should be able to read the layout with the method get_frontend_fieldcatalog

but I am getting dump at this method saying.

An exception occurred that is explained in detail below.

The exception, which is assigned to class 'CX_SY_REF_IS_INITIAL', was not

caught and

therefore caused a runtime error.

The reason for the exception is:

You attempted to use a 'NULL' object reference (points to 'nothing')

access a component (variable: "R_GRID").

An object reference must point to an object (an instance of a class)

before it can be used to access components.

Either the reference was never set or it was set to 'NULL' using the

CLEAR statement.

I am not able to understand this.

[Former Member]

Hi Mercin

just addition to this to my above reply see my sample code.

Data : r_container TYPE REF TO cl_gui_custom_container,

r_grid TYPE REF TO cl_gui_alv_grid.

DATA: t_fcat TYPE lvc_t_fcat,

fs_fcat TYPE lvc_s_fcat.

CALL METHOD r_grid->get_frontend_fieldcatalog

IMPORTING

et_fieldcatalog = t_fcat.

I think with this I should able to read the the layout but its giving the above dump

Regards

Sagar.

[MarcinPciak]

Obviously you are trying to change the fieldcatalog for the grid object which was not never instantiated.

You need to:

- create the object itself

create object r_grid
      importing parent = ....

- then display it with method set_table_for_first_display passing original fieldcatalog to it

- then you are able to change the fieldcalog with the method you use in some event handling method

I think you are new to ALV grid, ain't you? Please therefore refer some standard programs as you miss basic understanding of the ALV itself. Just go through the document I gave you or have a look at BCALV_GRID_* programs.

Regards

Marcin

[Clemenss]

Hi Sagar,

the sequence should be:

- create grid object

- assign table to be displayed first to field-symbol

- set table for first display (with structure and field-symbol as table

- get frontend field catalog and modify it for new structure

- set frontend field catalog

- assign other table to field-symbol

- call grid refresh method.

Sorry, the coding is not for free

Regards,

Clemens

[MarcinPciak]

Sorry, the coding is not for free 

Clemens, you should suggest the lowest bid

[Former Member]

Resolved.