Using Nokogiri to select a block of HTML based on text? - ruby-on-rails

Question

I have the following block of HTML:
<tr>
<th>Consignment Service Code</th>
<td>ND16</td>
</tr>
What I'm ultimately trying to pull is that ND16 string, but to do that, I need to select the <tr> based on the text Consignment Service Code.
I'm using Nokogiri already to parse the HTML, so it'd be great to just keep using that.
So, how can I select that block of HTML based on the text "Consignment Service Code"?

Answer 1

You can do this:
require 'nokogiri'
doc=Nokogiri::HTML::parse <<-eot
<tr>
<th>Consignment Service Code</th>
<td>ND16</td>
</tr>
eot
node = doc.at_xpath("//*[text()='Consignment Service Code']/following-sibling::*[1]")
puts node.text
# >> ND16
Here's an additional try, which might help you to get going:
## parent node
parent_node = doc.at_xpath("//*[text()='Consignment Service Code']/..")
puts parent_node.name # => tr
## to get the child td
puts parent_node.at_xpath("//td").text # => ND16
puts parent_node.to_html
#<tr>
#<th>Consignment Service Code</th>
# <td>ND16</td>
#</tr>

Answer 2

Yet another way.
Use Nokogiri's css method to find the appropriate tr nodes and then select the ones that have the desired text in the th tag. Finally, work with the selected nodes and extract the td values:
require 'nokogiri'
str = '<tr>
<th>Consignment</th>
<td>ND15</td>
</tr>
<tr>
<th>Consignment Service Code</th>
<td>ND16</td>
</tr>
<tr>
<th>Consignment Service Code</th>
<td>ND17</td>
</tr>'
doc = Nokogiri::HTML.parse(str)
nodes = doc.css('tr')
.select{|el|
el.css('th').text =~ /^Consignment Service Code$/
}
nodes.each do |el|
p el.css('td').text
end
Output is:
"ND16"
"ND17"