Re: self-extending subfile and multiple selection?

[Booth Martin <booth@xxxxxxxxxxxx>]

Subfiles over some number, about 2500 in my experience, become 
unmanageable to navigate.   Record number 9,900 is more than 450 page 
downs.  Few users will have the patience for that.

Consider using for/endfor loops instead of READC.  Much easier to 
implement and performance is a non-issue.



Charles St-Laurent wrote:
> Hi!
>
> I read an article about self-extending subfile to navigate through data. The
> technique looks quite simple. Each time the user press the PageDown key, or
> the alternate key associated to the PageDown action, the program takes the
> control and fills the next subfile page. But if the user press the PageUp
> key, the system handles it.
>
> There is limitations about this technique. The number of records the subfile
> can contain is still limited to 9999. What if my file contains about 300 000
> entries and a maniac user tries to scroll down to the end of the file?
>
> In the other hand, if I use a subfile with SFLSIZ = SFLPAG, how can I trap
> multiple selection in the subfile. I mean, what if the user selects a record
> in one page, press the PageDown key, and selects another record in that
> page? If I clear the subfile each time the user press the PageUp or PageDown
> key, the READC won't see the selected records from the previous pages, only
> the ones in the current page, isn't it?
>
> What's bugging me is the limited size of a self-extending subfile and the
> case of a multiple selection between pages. Is there a way to have a
> self-extending subfile that can be greater than 9999 records and handles the
> selection of multiple records through different pages?
>
> Charles St-Laurent