2009-03-04 67 views
12

我有以下HTML:引入nokogiri(RubyGem):查找和替換HTML標記

<html> 
<body> 
<h1>Foo</h1> 
<p>The quick brown fox.</p> 
<h1>Bar</h1> 
<p>Jumps over the lazy dog.</p> 
</body> 
</html> 

...並通過RubyGem Nokogiri(一hpricot替代),我想將它改變成以下HTML:

<html> 
<body> 
<p class="title">Foo</p> 
<p>The quick brown fox.</p> 
<p class="title">Bar</p> 
<p>Jumps over the lazy dog.</p> 
</body> 
</html> 

換句話說:如何使用Nokogiri查找和替換某些HTML標記?我知道如何找到它們(使用CSS關鍵字),但我不知道如何在解析文檔時替換它們。

感謝您的幫助!

回答

18

試試這個:

require 'nokogiri' 

html_text = "<html><body><h1>Foo</h1><p>The quick brown fox.</p><h1>Bar</h1><p>Jumps over the lazy dog.</p></body></html>" 

frag = Nokogiri::HTML(html_text) 
frag.xpath("//h1").each { |div| div.name= "p"; div.set_attribute("class" , "title") } 
+0

該解決方案是真正優雅!非常感謝! – Javier 2009-03-04 14:18:04

+0

你知道如何做一個CSS搜索來找到一個ID和一個類的div嗎?例如:

XXX
? – Javier 2009-03-13 16:52:48

+0

frag.xpath(「// div [@ id ='foo'and @ class ='bar']」) – SimonV 2009-03-14 01:34:29

15

好像這個作品的權利:

require 'rubygems' 
require 'nokogiri' 

markup = Nokogiri::HTML.parse(<<-somehtml) 
<html> 
<body> 
<h1>Foo</h1> 
<p>The quick brown fox.</p> 
<h1>Bar</h1> 
<p>Jumps over the lazy dog.</p> 
</body> 
</html> 
somehtml 

markup.css('h1').each do |el| 
    el.name = 'p' 
    el.set_attribute('class','title') 
end 

puts markup.to_html 
# >> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> 
# >> <html><body> 
# >> <p class="title">Foo</p> 
# >> <p>The quick brown fox.</p> 
# >> <p class="title">Bar</p> 
# >> <p>Jumps over the lazy dog.</p> 
# >> </body></html> 
6
#!/usr/bin/env ruby 
require 'rubygems' 
gem 'nokogiri', '~> 1.2.1' 
require 'nokogiri' 

doc = Nokogiri::HTML.parse <<-HERE 
    <html> 
    <body> 
     <h1>Foo</h1> 
     <p>The quick brown fox.</p> 
     <h1>Bar</h1> 
     <p>Jumps over the lazy dog.</p> 
    </body> 
    </html> 
HERE 

doc.search('h1').each do |heading| 
    heading.name = 'p' 
    heading['class'] = 'title' 
end 

puts doc.to_html