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Nokogiri: Select content between element A and B (3 answers)

Closed 3 years ago.

I m grabbing a div of text from a url and 我想去掉一个有backtotop的段落下的一切。班级。我在这里看到了一部关于 st流的反射法,它充满希望,但我可以指出,如何将它纳入到这样一页的@el中,只包含在四版的第一份<代码>p.backtotop之前的所有东西。

我的法典:

@doc = Nokogiri::HTML(open(url))
@el = @doc.css("div")[0]
end

背信弃义:

doc = Nokogiri::HTML(code)
stop_node = doc.css("p.backtotop")
doc.traverse do |node|
break if node == stop_node
# else, do whatever, e.g. `puts node.name`
end

Answer 1

Find the div you want.
Find the stop item you want, and then find all the following siblings.
Remove them.

例如:

<body>
  <div id="a">
    <h2>My Section</h2>
    <p class="backtotop">Back to Top</p>
    <p>More Content</p>
    <p>Even More Content</p>
  </div>
</body>

require  nokogiri 
doc = Nokogiri::HTML(my_html)
div = doc.at( #a )
div.at( .backtotop ).xpath( following-sibling::* ).remove
puts div
#=> <div id="a">
#=>     <h2>My Section</h2>
#=>     <p class="backtotop">Back to Top</p>
#=>     
#=>     
#=>   </div>

更复杂的例子是<代码>后至 2. 本项不得成为四分五裂的根源:

<body>
  <div id="b">
    <h2>Another Section</h2>
    <section>
      <p class="backtotop">Back to Top</p>
      <p>More Content</p>
     </section>
    <p>Even More Content</p>
  </div>
</body>

require  nokogiri 
doc = Nokogiri::HTML(my_html)
div = doc.at( #b )
n   = div.at( .backtotop )
until n==div
  n.xpath( following-sibling::* ).remove
  n = n.parent
end

puts div
#=> <div id="b">
#=>     <h2>Another Section</h2>
#=>     <section><p class="backtotop">Back to Top</p>
#=>       
#=>      </section>
#=>   </div>

如果您的超文本比上述内容更加复杂,请提供您希望得到的实际样本。 这是你今后提出的任何问题的良好建议。

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