How can I use ruby expression interpolation "#{var}" inside nokogiri css selector?

Question

I have been using nokogiri css for a while and i would like to be able to use ruby expression interpolation inside css selectors but it doesn't work. This is the code i would like to use:

doc = Nokogiri::HTML(open('http://www.somepage.com'))
keys=["BHiuG", "hUYtb4F", "jefHUY78i"]
keys.each do |k|
    keyvalue = doc.css('span[class="#{k}"]').children
    puts keyvalue
end

Is there any way to get a similar syntax working?

You need double quotes to make them work. `"span[class=\"#{k}\"]"` — LeBen, Aug 20 '12 at 14:52

score 8 · Accepted Answer · edited May 23 '17 at 12:14

8

It has nothing to do with Nokogiri: the problem is that you are using single quotes but string interpolation in Ruby requires double quotes. Since single quotes are also allowed on CSS selectors, I'd write:

doc.css("span[class='#{k}']").children

edited May 23 '17 at 12:14

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answered Aug 20 '12 at 14:52

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How can I use ruby expression interpolation "#{var}" inside nokogiri css selector?

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