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Re: Future standard GUI library

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From "Frank Millman" <frank@chagford.com>
Subject Re: Future standard GUI library
Date Fri, 14 Jun 2013 07:39:08 +0200
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"Chris Angelico" <rosuav@gmail.com> wrote in message 
news:CAPTjJmo+fWsCD3Lb6s+zmWspKzzk_JB=pbcvfLBZjGCFxvM9HA@mail.gmail.com...
> 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 my case, it is either-or. I do not just do field-by-field validation, I 
do field-by-field submission. The server builds up a record of the data 
entered while it is being entered. When the user selects 'Save', it does not 
resend the entire form, it simply sends a message to the server telling it 
to process the data it has already stored.

> 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...
>

I plead guilty to this, but I am not happy about it, hence my original post. 
I will take on board your comments, and see if I can figure out a way to 
have the best of both worlds.

Frank

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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

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