RE: Single Page Subfile Example

[Martin Rowe <martin@xxxxxxxxxx>]

On Tue, 2003-07-15 at 10:22, Chandra Sekhar Rath wrote:
>      Hi Booth,
>      
>      The existing one indeed is an expanding subfile which i wanted to
> convert to a Single Page One.

Hi Chandra

One option for processing subfile requests for a page no longer shown is
to store them in a keyed data queue. Put the relative record number of
the record (database file RRN, not the SFLRRN) in a hidden field on the
subfile. When you process the screen (page up/down F-key, Enter etc),
read the subfile first and add a data queue entry with the record RRN as
key and the subfile option as data value. When you build the subfile for
a page up/down, check if there are any matching entries in the data
queue, and pre-load the subfile option field with the value from the
data queue. When the time comes to process subfile options (eg. Enter
pressed), then you process entries in the data queue instead (as it
holds all selected subfile record options) and retrieve the identified
record for processing. 

Kevin Vandever wrote a good article on this technique over at
MidrangeServer -
http://www.midrangeserver.com/mpo/mpo052302-story05.html which includes
example code. I modified one of my utilities, WRKUSROUTQ,
http://www.dbg400.net/usroutq.html - to use the technique on a single
page/page by page subfile and it made a big difference to the usability
of the program. You can find my take on the code required in the search
add-on zip file - 
http://www.dbg400.net/download/extras/wrkusroutq/wuo_search.zip - look
at the DBG186R4 RPGLE member.

Regards, Martin
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