× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  1.  Home
  2. RPG400-L
  3. November 2019

Re: 5250 Catch the delete key

On Sun, 24 Nov 2019 at 00:44, Booth Martin <booth@xxxxxxxxxxxx> wrote:

5250 tells me when a user presses an F-key, Enter, page-up, or page-down
key. What about the Delete key? Is that available too?

Short answer: No.

Long answer:
5250 is a block mode protocol, designed back in the days when
communication was slow and expensive.
The device can perform local operations like typing characters,
Insert, Delete without sending anything down the wire to the host.

When the user presses one of the AID keys (Field exit, Enter, etc) the
device sends the entire contents of the display buffer to the host,
along with some status bytes that tell the host /what/ AID key was
pressed.

This block mode behaviour is very different to typical (simple) ASCII
terminals of the same era; those protocols send each and every
keystroke to the host.

The modern web interface can use AJAX to capture some local
keystrokes. I'm not certain how meta keys like Delete are handled in
Ajax.

--buck

As an Amazon Associate we earn from qualifying purchases.

This thread ...
Follow-Ups:
Replies:
Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.