ruby - How to get the index of 'th' element using Nokogiri -


i have following html code , need determine index of "number of strings" using <span> id. i'm using nokogiri parse html , row. 

doc = nokogiri::parse(myfile.html) table = doc.xpath("//span[@id='numstrs']/../../..") row = table.xpath["tr[1]"]

here html:

<tr> <th id ="langframe"> <span id="cabinet"> cabinet</span> </th> <th id ="langbb1"> <span id="bb1"> bb1</span> </th> <th id ="langbb2"> <span id="bb2"> bb2</span> </th> <th id ="langtemp"> <span id="temp"> temperature</span> </th> <th id="langstrs"> <span id="stringspresent"> strings present</span> </th> <th id="langmstrqty"> <span id="numstrs"> number of strings</span> </th> </tr>

got working, not sure if efficient way it.. works

header = table.xpath("tr[1]") value = header.xpath("//span[@id='#{id}']").text index = header.search('th//text()').collect {|text| text.to_s.strip}.reject(&:empty?).index(value)+1

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