Rails spinoffs - May 2007 - does $$() or Element.getElementBySelector() support something like: $$('a:contains("next >")');

Hi guys,

I am new to this whole css3/ xpath thing and I am diggin it 8).

I am trying to do something like $$(''a:contains("next
>")'');
but I get a js error when executing that.

Is this even supported or am I doing it wrong.

Thanks.


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Hey there!

jdalton a écrit :
> I am trying to do something like $$(''a:contains("next
>")'');
> but I get a js error when executing that.
I''d really like you to tell me what exactly you think this selector
should fetch...  It''s not a CSS3 selector at all (:contains does not
seem to be part of the CSS 3 Selectors spec).

At "worst," and assuming I guess your intent correctly, you can
emulate
it like so (untested, but should do well enough):

$$(''a'').select(function(link) {
  return link.innerHTML.stripTags().include(''next >'');
})

''HTH

-- 
Christophe Porteneuve a.k.a. TDD
"[They] did not know it was impossible, so they did it." --Mark Twain
Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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> It''s not a CSS3 selector at all (:contains does not
> seem to be part of the CSS 3 Selectors spec).
Hi Christophe,

Sorry to contradict you, but it is:
http://www.w3.org/TR/2001/CR-css3-selectors-20011113/#content-selectors

- Tobie


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Hey Tobie!

tobie a écrit :
> Sorry to contradict you, but it is:
> http://www.w3.org/TR/2001/CR-css3-selectors-20011113/#content-selectors
Except it''s not in the latest version:

	http://www.w3.org/TR/css3-selectors/

The version you''re alluding to is almost 6 years old.  The :contains
pseudo-class was dropped somewhere along the way I guess.

-- 
Christophe Porteneuve a.k.a. TDD
"[They] did not know it was impossible, so they did it." --Mark Twain
Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Haha, you''re right... sorry about that!

On May 5, 7:00 am, Christophe Porteneuve
<t...-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org>
wrote:
> Hey Tobie!
>
> tobie a écrit :
>
> > Sorry to contradict you, but it is:
> >http://www.w3.org/TR/2001/CR-css3-selectors-20011113/#content-selectors
>
> Except it''s not in the latest version:
>
>        http://www.w3.org/TR/css3-selectors/
>
> The version you''re alluding to is almost 6 years old.  The
:contains
> pseudo-class was dropped somewhere along the way I guess.
>
> --
> Christophe Porteneuve a.k.a. TDD
> "[They] did not know it was impossible, so they did it." --Mark
Twain
> Email: t...-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Christophe Porteneuve wrote:
> jdalton a écrit :
>> I am trying to do something like $$(''a:contains("next
>")''); but I get
>> a js error when executing that.
> I''d really like you to tell me what exactly you think this
selector
> should fetch...  It''s not a CSS3 selector at all (:contains does
not seem
> to be part of the CSS 3 Selectors spec).
> 
> At "worst," and assuming I guess your intent correctly, you can
emulate
> it like so (untested, but should do well enough):
> 
> $$(''a'').select(function(link) { return
> link.innerHTML.stripTags().include(''next >''); })
AFAICT, this shouldn''t really work because innerHTML doesn''t
decode HTML
entities (">" in this example), but anyway, the approach sounds
OK.

OTOH, XPath should do it with: $x(''.//a[contains(.,"next
>")]'')

In Prototype terms, this would become:
 document._getElementsByXPath(''.//a[contains(.,"next
>")]'')

But anyway this was just for the sake of example, as, AFAIK, currently
Prototype doesn''t have XPath support for "some" browsers
(e.g. MSIE).
> ''HTH
+1 ;-)

- --
Marius Feraru
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Hey guys,

Thanks for clearing that up.
Like I said I am rather new to the xpath (mainly because its not cross
browser at the moment) and css3 syntax.
I recognize the power it holds and it has peeked my curiosity.

Do you know of any resources for finding good usage examples?

P.S. Here is a regexp I use for extracting html elements from text in
php.
The regexp can be used in js too. Its very thorough and allows for
tags like <div title=''next >''
id="nav">test</div>

$selfClosing =
preg_match(''/(br|hr|img|input|link|meta|param)/i'',
$tagName);

if($selfClosing){
  //very thorough regular expression
  $pattern =
''%<''.$tagName.''(?:(?:(?:\s|\n)+\w+(?:(?:\s|\n)*=(?:\s|
\n)*(?:".*?"|\''.*?\''|[^\''">\s]+))?)+(?:\s|\n)*|(?:\s|\n)*)/>%i'';
}
else{
  $pattern =
''%<''.$tagName.''(?:(?:(?:\s|\n)+\w+(?:(?:\s|\n)*=(?:\s|
\n)*(?:".*?"|\''.*?\''|[^\''">\s]+))?)+(?:\s|\n)*|(?:\s|\n)*)>(?:(?:.|
\n)*?)</''.$tagName.''>%'';
}

- Thanx


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jdalton wrote:
> Like I said I am rather new to the xpath (mainly because its not cross
> browser at the moment) and css3 syntax.
CSS3 fails under the same "not cross browser" umbrella given its
current
status (both as standardization and implementation).
> I recognize the power it holds and it has peeked my curiosity.
> Do you know of any resources for finding good usage examples?
Whatever links we may give, they will all fail as "advertising", so
let''s
stick to the Wikipedia article [1], as it provides lotta good pointers.
Besides, it looks like Google still works OK for this query [2] ;-)

[1] http://en.wikipedia.org/wiki/Xpath
[2] http://www.google.com/search?q=xpath%20tutorial
> P.S. Here is a regexp I use for extracting html elements from text in 
> php. The regexp can be used in js too. Its very thorough and allows for 
> tags like <div title=''next >''
id="nav">test</div>
That ">" char inside @title should have been encoded, but you
already knew
that; same goes for things like <foo onclick="x = y > 2 ? a :
b"> or <a
href="...?foo=a&bar=b">, etc.
> $selfClosing =
preg_match(''/(br|hr|img|input|link|meta|param)/i'',
> $tagName);
You missed ''base'', ''area'',
''col'' (maybe more, depending what standard you
are referring to - like ''frame''?) ;-)
> if($selfClosing){
>   //very thorough regular expression
>   $pattern =
''%<''.$tagName.''(?:(?:(?:\s|\n)+\w+(?:(?:\s|\n)*=(?:\s|
>
\n)*(?:".*?"|\''.*?\''|[^\''">\s]+))?)+(?:\s|\n)*|(?:\s|\n)*)/>%i'';
I wouldn''t name this really "thorough", but OK, if it serves
your purposes,
then use it. If you allow me some comments (OK, ignoring the ugly "new
lines" workaround), I''d say:

- - the approach you chose for determining the attributes list results in
a too high level of alternation: TAG ( ATTRIBUTE+ BLANK* | BLANK* )
you could minimize it to: TAG ATTRIBUTE* BLANKS*

- - attribute names may be more than "\w+" (eg.:
''http-equiv''). If you want to
play friendly with at least HTML4, allow at least ''-'', but
extending it to
XML name/nmtoken rules should be even better ;-)

- - be more economic when getting the attributes values by using negative
lists, e.g. ".*?" -> "[^"]*"

- - note that browsers can handle even aberrations like "<foo bar=
>", making
attribute value optional (even when "=" is in place) would do it
> }
> else{
>   $pattern =
''%<''.$tagName.''(?:(?:(?:\s|\n)+\w+(?:(?:\s|\n)*=(?:\s|
>
\n)*(?:".*?"|\''.*?\''|[^\''">\s]+))?)+(?:\s|\n)*|(?:\s|\n)*)>(?:(?:.|
> \n)*?)</''.$tagName.''>%'';
OK, I''m sure you know this one may fail badly, but anyway, at least
allow
whitespace in the "end-tag", after the tagName. ;-)
> }
cheers

and my apologies for this off-topic message
(is "Saturday night" a good excuse?) ;-)
- --
Marius Feraru
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@Marius Feraru - Thanx for the tips.
I will fix the effected php code 8), so it won''t "fail
badly".
;-P


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