Rails - May 2013 - Need a help to get a good start with Nokogiri #css syntax.

Hi,

I am learning "Nokogiri". But I am quite good Nokogiri''s
#xpath
technique.But wanted to learn also #css. So started to search online
materials to see how other writes a code using CSS techniques. Doing so
I got one interesting code as below:

=======================================================#Google laptop search

require "nokogiri"
require "open-uri"
result = open("http://www.google.co.in/search?q=laptop",
"User-Agent" =>
"HTTP_USER_AGENT:Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US)
AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.47
Safari/534.13").read()

#puts result.inspect
doc = Nokogiri::HTML(result)

puts "result list"
#puts doc
puts doc.css("#resultStats").text

puts "related searches"
doc.css("#trev a").each do |x|
  puts "#{x.text} => #{x[:href]}"
end

puts "results"

doc.css("#ires ol li").each do |x|
  node = x.at_css("div a")
  puts node[:href]
  puts node.text
  desc_node = x.at_css("div div.s")
  puts node.text
end
=======================================================
But I am not comfortable with some notation used here,so thought if
anyone out there help me to redirect to a resource where I can learn
such techniques.

My hard confusion is with the below lines:

***** "#ires ol li" *****

- when to write this way?
- what `#` stands for? Looking at the source page I saw `ires` is one
id. -- when I need to use such `#` and when `.`?
- Is there any other operators like `#` and `.` when using css?

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On Wednesday, May 1, 2013 1:43:06 PM UTC+1, Ruby-Forum.com User
wrote:
>
>
> But I am not comfortable with some notation used here,so thought if 
> anyone out there help me to redirect to a resource where I can learn 
> such techniques. 
>
>
You need to read up on css selectors
 
> My hard confusion is with the below lines: 
>
> ***** "#ires ol li" ***** 
>
> - when to write this way? 
> - what `#` stands for? Looking at the source page I saw `ires` is one 
> id. -- when I need to use such `#` and when `.`? 
>
#foo finds an element with id foo whereas .foo finds an element with class 
foo. Which one to use depends on the markup.
 
> - Is there any other operators like `#` and `.` when using css? 
>
>
Yes, there are a whole bunch, such as the pseudo selectors (:not, 
:nth-child), attribute selectors etc.

https://developer.mozilla.org/en-US/docs/CSS/Getting_Started/Selectors

has fairly exhaustive info


Fred 

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Frederick Cheung wrote in post #1107477:
> On Wednesday, May 1, 2013 1:43:06 PM UTC+1, Ruby-Forum.com User wrote:
> Yes, there are a whole bunch, such as the pseudo selectors (:not,
> :nth-child), attribute selectors etc.
>
> https://developer.mozilla.org/en-US/docs/CSS/Getting_Started/Selectors
>
> has fairly exhaustive info
@Fred Thank you very much! The source link you shared is exactly what I 
was looking for. For Nokogiri - I think only the selectors part would be 
great to read to get start Nokogiri right?

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I am searching for a good example for the below method:

Nokogiri::XML::Node#matches? 
(http://www.rubydoc.info/gems/nokogiri/frames)
Nokogiri::XML::Node#fragment 
(http://www.rubydoc.info/gems/nokogiri/frames)


Any one out there,ever used these 2 methods. I need an example against 
each,so your help will be much appreciated.


Thanks

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check out this reference:

http://www.w3schools.com/cssref/css_selectors.asp

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gerry.jenkins-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote in post
#1110301:
> check out this reference:
>
> http://www.w3schools.com/cssref/css_selectors.asp

No Sir! I asked for the examples of the 2 methods,if any one ever used:

Nokogiri::XML::Node#matches?
Nokogiri::XML::Node#fragment

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gerry.jenkins-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote in post
#1110301:
> check out this reference:
>
> http://www.w3schools.com/cssref/css_selectors.asp

here is another link: 
http://reference.sitepoint.com/css/pseudoclass-firstoftype

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