Nokogiri刮脸问题

Question

我想写一个简单的脚本，告诉我什么时候x节目的下一集将被释放。

这里是我到目前为止有：

require 'rubygems' 
require 'nokogiri' 
require 'open-uri' 

url = "http://www.tv.com/shows/game-of-thrones/episodes/" 
doc = Nokogiri::HTML(open(url)) 

puts doc.at_css('h1').text 
airdate = doc.at_css('.highlight_date span , h1').text 
date = /\W/.match(airdate) 
puts date 

当我运行这一切，它返回是： 游戏宝座

CSS选择我用的还有给人行的airdate是/ XX/xx/xx，但是我只想要日期，所以为什么我使用了/ \ W /虽然我在这里可能完全错误。

所以基本上我只想打印节目标题和下一集的日期。

Answer 1

您可以如下操作： -

require 'nokogiri' 
require 'open-uri' 

url = "http://www.tv.com/shows/game-of-thrones/episodes/" 
doc = Nokogiri::HTML(open(url)) 

# under season4 currently 7 episodes present, which may change later. 
doc.css('#season-4-eps > li').size # => 7 

# collect season4 episodes and then their dates and titles 
doc.css('#season-4-eps > li').collect { |node| [node.css('.title').text,node.css('.date').text] } 
# => [["Mockingbird", "5/18/14"], 
#  ["The Laws of God and Men", "5/11/14"], 
#  ["First of His Name", "5/4/14"], 
#  ["Oathkeeper", "4/27/14"], 
#  ["Breaker of Chains", "4/20/14"], 
#  ["The Lion and the Rose", "4/13/14"], 
#  ["Two Swords", "4/6/14"]] 

再次在网页看，我可以看到，它始终与最新一季的数据开放。因此，上面的代码可以作如下修改： -

# how many sessions are present 
latest_session = doc.css(".filters > li[data-season]").size # => 4 

# collect season4 episodes and then their dates and titles 
doc.css("#season-#{latest_session}-eps > li").collect do |node| 
    p [node.css('.title').text,node.css('.date').text] 
end 
# >> ["The Mountain and the Viper", "6/1/14"] 
# >> ["Mockingbird", "5/18/14"] 
# >> ["The Laws of God and Men", "5/11/14"] 
# >> ["First of His Name", "5/4/14"] 
# >> ["Oathkeeper", "4/27/14"] 
# >> ["Breaker of Chains", "4/20/14"] 
# >> ["The Lion and the Rose", "4/13/14"] 
# >> ["Two Swords", "4/6/14"] 

---

按的评论，似乎OP可以有意从下一集的网页箱送出来的数据。这里是一个方式做同样的：

require 'nokogiri' 
require 'open-uri' 

url = "http://www.tv.com/shows/game-of-thrones/episodes/" 
doc = Nokogiri::HTML(open(url)) 

hash = {} 
doc.css('div[class ~= next_episode] div.highlight_info').tap do |node| 
    hash['date'] = node.css('p.highlight_date > span').text[/\d{1,2}\/\d{1,2}\/\d{4}/] 
    hash['title'] = node.css('div.highlight_name > a').text 
end 

hash # => {"date"=>"5/18/2014", "title"=>"Mockingbird"} 

值得一读tap{|x|...} → obj

息率x来将挡，然后返回x。该方法的主要目的是“挖掘”方法链，以便对链中的中间结果执行操作。

和str[regexp] → new_str or nil。

也读CSS selectors了解选择器是如何与方法#css。