ruby on rails - How to prevent Nokogiri from adding <DOCTYPE> tags?

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ruby on rails - How to prevent Nokogiri from adding <DOCTYPE> tags?

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

ruby on rails - How to prevent Nokogiri from adding <DOCTYPE> tags?

I noticed something strange using Nokogiri recently. All of the HTML I had been parsing had been given start and end <html> and <body> tags.

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body>

How can I prevent Nokogiri from doing this?

I.E., when I do:

doc = Nokogiri::HTML("<div>some content</div>")
doc.to_s

or:

doc.to_html

I get the original:

<html blah><body>div>some content</div></body></html>

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1 Reply

深蓝 · Answer 1 · 2021-10-17T02:57:56+0000

The problem occurs because you're using the wrong method in Nokogiri to parse your content.

require 'nokogiri'

doc = Nokogiri::HTML('<p>foobar</p>')
puts doc.to_html
# >> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# >> <html><body><p>foobar</p></body></html>

Rather than using HTML which results in a complete document, use HTML.fragment, which tells Nokogiri you only want the fragment parsed:

doc = Nokogiri::HTML.fragment('<p>foobar</p>')
puts doc.to_html
# >> <p>foobar</p>

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ruby on rails - How to prevent Nokogiri from adding <DOCTYPE> tags?

ruby on rails - How to prevent Nokogiri from adding <DOCTYPE> tags?

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