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Asked: 2026-05-11T09:18:56+00:00

I’d like to figure out a way to get to the HTML result (mentioned

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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? #

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>
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1 Answer

  1. 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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