Re: Future standard GUI library

References	(10 earlier) <mailman.2430.1369932803.3114.python-list@python.org> <20130601201817.55d3361dda93dac387a9eab6@gmx.net> <mailman.2529.1370119566.3114.python-list@python.org> <20130612222819.2a044e86ab4b6defe1939a04@gmx.net> <kpc3jv$438$1@ger.gmane.org>
Date	2013-06-14 00:04 +1000
Subject	Re: Future standard GUI library
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.3197.1371132261.3114.python-list@python.org> (permalink)

Show all headers | View raw

On Thu, Jun 13, 2013 at 7:32 PM, Frank Millman <frank@chagford.com> wrote:
> I am talking about what I call 'field-by-field validation'. Each field could
> have one or more checks to ensure that the input is valid. Some can be done
> on the client (e.g. value must be numeric), others require a round-trip to
> the server (e.g. account number must exist on file). Some applications defer
> the server-side checks until the entire form is submitted, others perform
> the checks in-line. My preference is for the latter.

It's not either-or. The server *MUST* perform the checks at the time
of form submission; the question is whether or not to perform
duplicate checks earlier. This is an absolute rule of anything where
the client is capable of being tampered with, and technically, you
could violate it on a closed system; but it's so easy to migrate from
closed system to diverse system without adding all the appropriate
checks, so just have the checks from the beginning.

In terms of software usability, either is acceptable, but do make sure
the user can continue working with the form even if there's latency
talking to the server - don't force him/her to wait while you check if
the previous field was valid. I know that seems obvious, but
apparently not to everyone, as there are forms out there that violate
this...

ChrisA

Thread

Future standard GUI library Beinan Li <li.beinan@gmail.com> - 2013-05-18 10:03 -0400
  Re: Future standard GUI library Kevin Walzer <kw@codebykevin.com> - 2013-05-18 11:32 -0400
  Re: Future standard GUI library Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-05-18 21:25 +0000
  Re: Future standard GUI library llanitedave <llanitedave@veawb.coop> - 2013-05-18 20:01 -0700
    Re: Future standard GUI library Kevin Walzer <kw@codebykevin.com> - 2013-05-19 08:57 -0400
  Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-22 15:42 +0200
    Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-23 00:24 +1000
      Re: Future standard GUI library llanitedave <llanitedave@veawb.coop> - 2013-05-22 19:31 -0700
        Re: Future standard GUI library Fábio Santos <fabiosantosart@gmail.com> - 2013-05-23 07:43 +0100
        Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-23 16:48 +1000
        RE: Future standard GUI library Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-23 09:58 +0300
        Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-23 17:03 +1000
        RE: Future standard GUI library Fábio Santos <fabiosantosart@gmail.com> - 2013-05-23 08:08 +0100
      Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-23 17:41 +0200
        Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-24 01:51 +1000
          Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-26 19:43 +0200
            Re: Future standard GUI library Roy Smith <roy@panix.com> - 2013-05-26 14:16 -0400
              Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-27 17:31 +0200
                Re: Future standard GUI library Michael Torrie <torriem@gmail.com> - 2013-05-27 11:13 -0600
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-28 08:21 +1000
                Re: Future standard GUI library Roy Smith <roy@panix.com> - 2013-05-27 19:10 -0400
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-28 17:11 +1000
                Re: Future standard GUI library 88888 Dihedral <dihedral88888@gmail.com> - 2013-05-28 02:40 -0700
                Re: Future standard GUI library Denis McMahon <denismfmcmahon@gmail.com> - 2013-05-28 01:01 +0000
            RE: Future standard GUI library Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-26 21:32 +0300
              Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-28 19:26 +0200
                Re: Future standard GUI library Michael Torrie <torriem@gmail.com> - 2013-05-28 12:16 -0600
                RE: Future standard GUI library Carlos Nepomuceno <carlosnepomuceno@outlook.com> - 2013-05-29 00:17 +0300
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-29 17:20 +1000
            Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-27 04:56 +1000
            Re: Future standard GUI library Michael Torrie <torriem@gmail.com> - 2013-05-26 13:41 -0600
              Re: Future standard GUI library Roy Smith <roy@panix.com> - 2013-05-26 15:45 -0400
                Re: Future standard GUI library Michael Torrie <torriem@gmail.com> - 2013-05-26 15:13 -0600
                Re: Future standard GUI library Grant Edwards <invalid@invalid.invalid> - 2013-05-28 15:40 +0000
              Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-27 17:22 +0200
                Re: Future standard GUI library Michael Torrie <torriem@gmail.com> - 2013-05-27 11:16 -0600
                Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-30 18:40 +0200
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-31 02:53 +1000
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-06-02 06:46 +1000
                Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-06-12 22:28 +0200
                Re: Future standard GUI library "Frank Millman" <frank@chagford.com> - 2013-06-13 11:32 +0200
                Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-06-14 17:18 +0200
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-06-15 03:00 +1000
                Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-06-15 14:25 +0200
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-06-15 23:26 +1000
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-06-14 00:04 +1000
                Re: Future standard GUI library "Frank Millman" <frank@chagford.com> - 2013-06-14 07:39 +0200
                Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-06-14 19:10 +1000
                Re: Future standard GUI library "Frank Millman" <frank@chagford.com> - 2013-06-14 11:36 +0200
                Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-06-01 20:18 +0200
                Re: Future standard GUI library Terry Jan Reedy <tjreedy@udel.edu> - 2013-06-01 17:52 -0400
            Re: Future standard GUI library Ian Foote <ian@feete.org> - 2013-05-26 22:02 +0100
            Re: Future standard GUI library Chris Angelico <rosuav@gmail.com> - 2013-05-27 08:09 +1000
        Re: Future standard GUI library Grant Edwards <invalid@invalid.invalid> - 2013-05-23 20:37 +0000
          Re: Future standard GUI library Wolfgang Keller <feliphil@gmx.net> - 2013-05-28 19:28 +0200
            Re: Future standard GUI library Grant Edwards <invalid@invalid.invalid> - 2013-05-28 18:25 +0000
              Re: Future standard GUI library 88888 Dihedral <dihedral88888@gmail.com> - 2013-05-28 16:19 -0700

csiph-web