如何把一组< p>在< div>内 [英] How to put a group of <p> inside a <div>
本文介绍了如何把一组< p>在< div>内的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想通过使用以下Ruby代码和 Nokogiri ：
I'd like to figure out a way to get to the HTML result (mentioned further below) by using the following Ruby code and Nokogiri:
require 'rubygems'
require 'nokogiri'
value = Nokogiri::HTML.parse(<<-HTML_END)
"<html>
<body>
<p id='1'>A</p>
<p id='2'>B</p>
<h1>Bla</h1>
<p id='3'>C</p>
<p id='4'>D</p>
<p id='5'>E</p>
</body>
</html>"
HTML_END
# The selected-array is given by the application.
# It consists of a sorted array with all ids of
# <p> that need to be enclosed by the <div>
selected = ["2","3","4"]
first_p = selected.first
last_p = selected.last
#
# WHAT RUBY CODE DO I NEED TO INSERT HERE TO GET
# THE RESULTING HTML AS SEEN BELOW?
#
生成的HTML应如下所示（请注意插入的< div id ='XYZ'> ）：
The resulting HTML should look like this (please note the inserted <div id='XYZ'>):
<html>
<body>
<p id='1'>A</p>
<div id='XYZ'>
<p id='2'>B</p>
<h1>Bla</h1>
<p id='3'>C</p>
<p id='4'>D</p>
</div>
<p id='5'>E</p>
</body>
</html>
推荐答案
这是我在我的项目（Vlad @ SO& Whitelist @ irc＃rubyonrails：感谢您的帮助和灵感）：
This is the working solution I've implemented into my project (Vlad@SO & Whitelist@irc#rubyonrails: Thanks for your help and inspiration.):
require 'rubygems'
require 'nokogiri'
value = Nokogiri::HTML.parse(<<-HTML_END)
"<html>
<body>
<p id='1'>A</p>
<p id='2'>B</p>
<h1>Bla</h1>
<p id='3'>C</p>
<p id='4'>D</p>
<p id='5'>E</p>
</body>
</html>"
HTML_END
# The selected-array is given by the application.
# It consists of a sorted array with all ids of
# <p> that need to be enclosed by the <div>
selected = ["2","3","4"]
# We want an elements, not nodesets!
# .first returns Nokogiri::XML::Element instead of Nokogiri::XML::nodeset
first_p = value.css("p##{selected.first}").first
last_p = value.css("p##{selected.last}").first
parent = value.css('body').first
# build and set new div_node
div_node = Nokogiri::XML::Node.new('div', value)
div_node['class'] = 'XYZ'
# add div_node before first_p
first_p.add_previous_sibling(div_node)
selected_node = false
parent.children.each do |tag|
# if it's the first_p
selected_node = true if selected.include? tag['id']
# if it's anything between the first_p and the last_p
div_node.add_child(tag) if selected_node
# if it's the last_p
selected_node = false if selected.last == tag['id']
end
puts value.to_html
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