[REBOL] Re: Input validation routines
From: robert:muench:robertmuench at: 27-Aug-2003 14:18
> -----Original Message-----
> From: [rebol-bounce--rebol--com] [mailto:[rebol-bounce--rebol--com]]
> On Behalf Of Petr Krenzelok
> Sent: Wednesday, August 27, 2003 9:15 AM
> To: [rebol-list--rebol--com]
> Subject: [REBOL] Re: Input validation routines
> ha, Robert progressing in db area, right? :-)
Petr, you see I don't forget your input, it just sometimes takes some
time :-)) Yes, you are right. I'm progrssing into DB and data-form area.
> My idea was to be able to e.g. have fields like:
>
> (99) - (999 999)
>
> where "9" means 'number from 0 - 9, whereas e.g. "x" means
> char. Cursor should move so that you would be able to type only
numbers,
> chars "() -" (those would be skipped, you would not be able to delete
them, etc.
Yes, something like this. My idea it to have VID styles that have a
field 'validation where you attach such a format string too and that
will either be valiated while typing or when leaving the field. Further
an error-handler exists, which can pop-up a help string.
layout [
...
field validate [(99) - (999 999)] validate-error [alter "Plase
only enter numbers"]
> "99.99.999" - date format - I saw various implementations :-)
BTW: Do you have a reference how those format strings are expressed? I
mean we have dialects and I'm sure we can clone this common way. I would
follow the common way, as a lot of people know it.
> Well, in DOS, all letters were of the same width, but in GUI
> environments, it is not the same, so " . ." move as you type, it is
a question
> how to do properly hilighting (some implementations failed, as you was
able to
> delete those date-format dots, etc.)
IMO in this case a check-as-you-type handler is needed. This handler
will analyze the string (on a positional base) and insert the dots at
the right place ;-)) and update the GUI. Robert
