Re: Help needed with displaying arrays in 4gl

David Robertson wrote: > > This query concerns the use of the DISPLAY ARRAY statement to display a > program array containing more rows than can be displayed onto the screen > array. Is there a simple, elegant, way of forcing the DISPLAY ARRAY > statement to initially display a specific section of a program array, > rather than the first screenful of rows ? > For example, displaying a program array containing 100 rows into a screen > array with 10 rows will always initially display rows 1-10. Can it be > made to display rows 51 to 60, and still allow subsequent scrolling up and > down the array ? > I could do this using scroll cursors, but wonder if there is an easier, > simpler way. > > Thanking you in advance for any help. > The short answer is no. A slightly longer answer is that with connvoluted use of INPUT ARRAY you could do it but slowly, so still really no. You could write your own code using plain DISPLAY. This is not simple. So no again. You could use Dynamic 4GL, which I believe does this: one of the holy grails (can there be more than one?) of 4GL programmers. Scroll cursors have the advantage that they can have as many rows as will fit on your disk. DISPLAY ARRAY requires a fixed array in memory. In VM systems you can make this very big without incurring that much penalty but it is still a limit. Mind you, there is a psychological limit on the number of rows a user will be willing to scroll through which is probably lower than a tolerably large array size. -- Peter Lancashire Information Systems Specialist, Bayer plc Eastern Way, Bury St Edmunds, Suffolk, IP32 7AH, UK Tel: +44-1635-562258, Fax: +44-1635-562281 --- If all else fails, read the instructions AND the release notes. All opinions are my own and not those of Bayer plc. My Internet plumbing does not allow me to mail and post news together. Sorry. --- Join Infuse, the UK Informix User Group at http://www.infuse.org.uk/