ABAP_ALTERNATIVES: 1 ... NUMBER OF {LINES|PAGES} n 2 ... LINE linno PAGE page 3 ... PAGE pagno page_properties
ABAP Addition ... • idx
What does it do? This statement assigns the properties of a list stored in a list buffer to the variables n, page, or the variables specified in page_properties .
System Fieldssy-subrcMeaning 0The list property was successfully specified. 4The line specified in linno or page specified in pagno cannot be found. 8The list level specified in idx cannot be found.
Latest notes:The statement DESCRIBE LIST should only be used for completed lists, because not all properties can be read in a list during its creation process. • • DESCRIBE LIST
ABAP Addition
What does it do? The list level can be specified with the addition •, where a data object (which contains the list index) of type i is expected for idx. The value of idx must be greater than or equal to 0. If the addition • is not specified, then the list level 0 (the basic list itself) is selected during the creation of the basic list, and the list level at which the event was triggered (sy-listi) is selected during the processing of a list event. If the list level specified in idx does not exist, the variables are not changed and sy-subrc is set to the value 8. • NUMBER OF LINES DESCRIBE LIST • NUMBER OF PAGES DESCRIBE LIST
ABAP Alternative 1 ... NUMBER OF {LINES|PAGES} n
What does it do? The number of lines is expected when specifying LINES , the number of list pages is stored in n when specifying PAGES. A data object of the type i is expected for n. The number of lines is counted from the first to the last line described by an output statement and contains the page headers and page footers. The spaces automatically inserted between the list pages are not counted. • LINE PAGE DESCRIBE LIST
ABAP Alternative 2 ... LINE linno PAGE page
What does it do? The corresponding page for the line number specified inlinno is determined and stored in page. Data objects of the type i are expected for linno and page. If the line specified in linno does not exist, page is not changed and sy-subrc is set to 4. The page headers and page footers are included in the line count, but not the spaces automatically inserted between the list pages. • PAGE DESCRIBE LIST
ABAP Alternative 3 ... PAGE pagno page_properties
What does it do? Various propertiespage_properties for the page number specified in pagno are determined and passed to the specified variables. At least one addition must be specified after pagno. The data type i is expected for pagno. If the page specified in pagno does not exist, the variables are not changed and sy-subrc is set to the value 4.
Example ABAP Coding Specification of properties of the list's last page that is currently displayed with two DESCRIBE statements during a list event. DATA: last_page TYPE i, lines TYPE i, first_line TYPE i, top_lines TYPE i.
...
AT LINE-SELECTION. DESCRIBE LIST: NUMBER OF PAGES last_page, PAGE last_page LINES lines FIRST-LINE first_line TOP-LINES top_lines.
