- From: Ian Hickson <ian@hixie.ch>
- Date: Thu, 26 Aug 2004 00:30:10 +0000 (UTC)
On Fri, 13 Aug 2004, Brian Wilson wrote:
>
> When playing around with the .validation constants, I was having a hard
> time understanding how it worked. Yes, I read it a few times, and then
> had to have Ian spell it out yet again for me. I'm not sure if there is
> already DOM precedent for the binary value additive method of
> determining which validation errors have occurred, but for most this
> will need more explanation.
NodeFilter.whatToShow is a bit field:
http://www.w3.org/TR/DOM-Level-2-Traversal-Range/traversal.html#Traversal-NodeIterator
> I'd like to see at least one example of how this works (especially for
> combination validity errors), such as:
>
> <input type="text" pattern="[0-9]{10}" name="inputype" value="93284"
> maxlength="4">
>
> would trigger ERROR_TOO_LONG (16) and ERROR_PATTERN_MISMATCH (32), which would
> yield, when querying the .validity property for that form field a value of 48
Added.
> When reading through the section on the new INPUT types, and trying to
> follow the prose descriptions of what characters are allowed/not
> allowed, I found myself wishing for a terse BNF string to reference.
> Perhaps prose-alone was chosen for a reason, but implementers - as well
> as some of us spec monkeys - have gotten used to BNF notation for a
> no-nonsense way of making sense of validity domains. Perhaps this can be
> added to the prose descriptions?
I've added this to the wishlist. I'm reluctant to do it right now since it
would be quite a lot of work and might introduce contradictions.
In general the allowed values are pretty obvious when you think about it.
Would BNF-like syntax realy be that much better?
<number> ::= '-'? <integer> [ '.' <integer> ]? [ 'e' '-'? <integer> ]?
<integer> ::= [ '0' .. '9']+
<time> ::= <digit> <digit> ':' <digit> <digit>
[ ':' <digit> <digit> [ '.' <digit>+ ]? ]?
etc.
For the big ones (datetime, e.g.), it gets kinda confusing.
--
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
Received on Wednesday, 25 August 2004 17:30:10 UTC