/home/pt/jiexi content is:
require ‘rubygems’
require ‘nokogiri’
doc = Nokogiri::HTML.parse(open(’/home/pt/jiexi’))
table=doc.xpath(’//ul[@id=“ul_list”]/li/a’)
puts table
output
irb(main):005:0> puts table
=> nil
puts table.xpath(’//ul’)
irb(main):006:0> puts table.xpath(’//ul’)
what i think is the script “puts table.xpath(’//ul’)” will not create
any output.
how strange it is to get the result,would you mind to tell me why?
On Mon, Jul 05, 2010 at 11:00:38AM +0900, Pen T. wrote:
title="ok3">
what i think is the script “puts table.xpath(’//ul’)” will not create
any output.
how strange it is to get the result,would you mind to tell me why?
“//ul” says “find all ul tags anywhere in the document”. It looks like
you have a ul tag in your document, and the XPath is doing what it is
supposed to do.
Why would you expect “//ul” to have no results?
On 05.07.2010 04:00, Pen T. wrote:
title="ok3">
what i think is the script “puts table.xpath(‘//ul’)” will not create
any output.
how strange it is to get the result,would you mind to tell me why?
That’s perfectly expected. If you look closely at the eplanation,
you’ll find out:
http://www.w3schools.com/Xpath/xpath_syntax.asp
You probably wanted
puts table.xpath(‘ul’)
Kind regards
robert