问题
I'm trying to use the nokogiri gem to extract all the urls on the page as well their link text and store the link text and url in a hash.
<html>
<body>
<a href=#foo>Foo</a>
<a href=#bar>Bar </a>
</body>
</html>
I would like to return
{"Foo" => "#foo", "Bar" => "#bar"}
回答1:
Here's a one-liner:
Hash[doc.xpath('//a[@href]').map {|link| [link.text.strip, link["href"]]}]
#=> {"Foo"=>"#foo", "Bar"=>"#bar"}
Split up a bit to be arguably more readable:
h = {}
doc.xpath('//a[@href]').each do |link|
h[link.text.strip] = link['href']
end
puts h
#=> {"Foo"=>"#foo", "Bar"=>"#bar"}
回答2:
Another way:
h = doc.css('a[href]').each_with_object({}) { |n, h| h[n.text.strip] = n['href'] }
# yields {"Foo"=>"#foo", "Bar"=>"#bar"}
And if you're worried that you might have the same text linking to different things then you collect the hrefs in arrays:
h = doc.css('a[href]').each_with_object(Hash.new { |h,k| h[k] = [ ]}) { |n, h| h[n.text.strip] << n['href'] }
# yields {"Foo"=>["#foo"], "Bar"=>["#bar"]}
来源：https://stackoverflow.com/questions/9336039/get-link-and-href-text-from-html-doc-with-nokogiri-ruby