如何使用Nokogiri解析HTML表格？ [英] How do I parse an HTML table with Nokogiri?

问题描述

我安装了Ruby和Mechanize。在我看来，Nokogiri可以做我想做的事，但我不知道该怎么做。

I installed Ruby and Mechanize. It seems to me that it is posible in Nokogiri to do what I want to do but I do not know how to do it.

这个表？它只是vBulletin论坛网站的HTML的一部分。我试图保留HTML结构，但删除了一些文本和标签属性。我想要得到一些细节，例如：标题，作者，日期，时间，回复和视图。

What about this table? It is just part of the HTML of a vBulletin forum site. I tried to keep the HTML structure but delete some text and tag attributes. I want to get some details per thread like: Title, Author, Date, Time, Replies, and Views.

请注意，HTML文档中的表格很少？我在一个具有 tbody ，< tbody id =threadbits_forum_251> 的特定表格之后。名字将永远是相同的（我希望）。我可以在代码中使用 tbody 和名称吗？

Please note that there are few tables in the HTML document? I am after one particular table with its tbody, <tbody id="threadbits_forum_251">. The name will be always the same (I hope). Can I use the tbody and the name in the code?

<table >
  <tbody>
    <tr>  <!-- table header --> </tr>
  </tbody>
  <!-- show threads -->
  <tbody id="threadbits_forum_251">
    <tr>
      <td></td>
      <td></td>
      <td>
        <div>
          <a href="showthread.php?t=230708" >Vb4 Gold Released</a>
        </div>
        <div>
          <span><a>Paul M</a></span>
        </div>
      </td>
      <td>
          06 Jan 2010 <span class="time">23:35</span><br />
          by <a href="member.php?find=lastposter&amp;t=230708">shane943</a> 
        </div>
      </td>
      <td><a href="#">24</a></td>
      <td>1,320</td>
    </tr>

  </tbody>
</table>

推荐答案

#!/usr/bin/ruby1.8

require 'nokogiri'
require 'pp'

html = <<-EOS
  (The HTML from the question goes here)
EOS

doc = Nokogiri::HTML(html)
rows = doc.xpath('//table/tbody[@id="threadbits_forum_251"]/tr')
details = rows.collect do |row|
  detail = {}
  [
    [:title, 'td[3]/div[1]/a/text()'],
    [:name, 'td[3]/div[2]/span/a/text()'],
    [:date, 'td[4]/text()'],
    [:time, 'td[4]/span/text()'],
    [:number, 'td[5]/a/text()'],
    [:views, 'td[6]/text()'],
  ].each do |name, xpath|
    detail[name] = row.at_xpath(xpath).to_s.strip
  end
  detail
end
pp details

# => [{:time=>"23:35",
# =>   :title=>"Vb4 Gold Released",
# =>   :number=>"24",
# =>   :date=>"06 Jan 2010",
# =>   :views=>"1,320",
# =>   :name=>"Paul M"}]

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