Lists in ABAP Screen Programming Lesson Forty Four

A list is generally used to output mass data. It can be output on either the screen or a printer.List may contain colors, symbols and icons as well as text.There is a standard GUI status for lists. Lists may also have a header and up to four lines of column headers. These are independent program objects, and are translatable.

You can also program interactive lists, which allow users to select lines or particular values. A selection triggers further processing. This might, for example, generate a further list containing a detail list.You fill the corresponding basic list buffer with WRITE statements at PBO or PAI. You can create your own list and column headers by programming a TOP-OF-PAGE event. This event will be triggered whenever a new page is created in the list buffer (NEW-PAGE).You can direct the output directly to the spool with the NEW-PAGE PRINT ON statement.

To create interactive lists on screens, you can use the list events AT LINE-SELECTION, AT USER-COMMAND, TOP-OF-PAGE, END-OF-PAGE and TOP_OF_PAGE DURING LINESELECTION.

There is no common list buffer outside of a CALL level.The list display is processed at the end of the screen in which LEAVE TO LIST-PROCESSING was programmed at PBO or PAI.To direct the output to the spool, use the NEW-PAGE PRINT ON statement, but not LEAVE TO LIST-PROCESSING.To create a list that is displayed on a screen, use the ABAP statement LEAVE TO LISTPROCESSING.

This sets a switch that ensures that the contents of the list buffer are output once the current screen has been processed. The SET PF-STATUS SPACE statement ensures that the list is displayed with the standard GUI status for lists.Once the screen has been fully processed and LEAVE TO LIST- PROCESSING was executed, the list is displayed on list screen 120 (screen for a basis program).

You can also use the following form: LEAVE TO LIST-PROCESSING AND RETURN TO SCREEN 0. SET PF-STATUS SPACE. WRITE ... LEAVE SCREEN.

When the system exits list processing (user presses F3, or ABAP statement LEAVE LISTPROCESSING), the system carries on processing the program with the screen following the one from which the list processing was started. You can override this by using the AND RETURN TO SCREEN addition in the LEAVE TO LIST-PROCESSING statement.

If you include the ABAP statement SUPPRESS DIALOG in a PBO module, the current screen is not displayed.If you want to display a list in a dialog box within a transaction, you must call a screen, but include the SUPPRESS DIALOG statement in its PBO processing block.

To return to the calling screen after leaving the list, declare: LEAVE TO LIST-PROCESSING AND RETURN TO SCREEN 0.

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LESSON 45 OVER VIEW OF DATA BASE UPDATES


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