使用 Nokogiri 从雅虎财经中获取价值? [英] Using Nokogiri to scrape a value from Yahoo Finance?

问题描述

我写了一个简单的脚本:

I wrote a simple script:

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

url = "http://au.finance.yahoo.com/q/bs?s=MYGN"
doc = Nokogiri::HTML(open(url))
name = doc.at_css("#yfi_rt_quote_summary h2").text
market_cap = doc.at_css("#yfs_j10_mygn").text
ebit = doc.at("//*[@id='yfncsumtab']/tbody/tr[2]/td/table[2]/tbody/tr/td/table/tbody/tr[11]/td[2]/strong").text


puts "#{name} - #{market_cap} - #{ebit}"

该脚本从雅虎财经中获取三个值.问题是 ebit XPath 返回 nil.我获得 XPath 的方式是使用 Chrome 开发人员工具以及复制和粘贴.

The script grabs three values from Yahoo finance. The problem is that the ebit XPath returns nil. The way I got the XPath was using the Chrome developer tools and copy and pasting.

这是我试图从 http://au.finance.yahoo.com/q/bs?s=MYGN，总流动资产行的实际值为483,992.

This is the page I'm trying to get the value from http://au.finance.yahoo.com/q/bs?s=MYGN and the actual value is 483,992 in the total current assets row.

任何帮助将不胜感激，特别是如果有办法使用 CSS 选择器获取此值.

Any help would be appreciated, especially if there is a way to get this value with CSS selectors.

推荐答案

Nokogiri 支持:

Nokogiri supports:

require 'nokogiri'
require 'open-uri'

doc = Nokogiri::HTML(open("http://au.finance.yahoo.com/q/bs?s=MYGN"))
ebit = doc.at('strong:contains("Total Current Assets")').parent.next_sibling.text.gsub(/[^,\d]+/, '')

puts ebit
# >> 483,992

我使用 <strong> 标记作为带有 :contains 伪类的位置标记，然后备份到包含的 <td>，移动到下一个 并抓取它的文本，然后最后使用 gsub(/[^,\d]+/, '') 删除不是数字或逗号的所有内容.

I'm using the <strong> tag as an place-marker with the :contains pseudo-class, then backing up to the containing <td>, moving to the next <td> and grabbing its text, then finally stripping the white-space using gsub(/[^,\d]+/, '') which removes everything that isn't a number or a comma.

Nokogiri 支持许多 jQuery 的 JavaScript 扩展，这就是 :contains 起作用的原因.

Nokogiri supports a number of jQuery's JavaScript extensions, which is why :contains works.

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