如何使用Nokogiri添加没有值的属性

Question

我想要给一个iframe添加autoplay属性，但这个属性只是一个标记，没有具体的值：

<iframe src="..." autoplay></iframe>

在Nokogiri中添加属性的方法如下：

iframe = Nokogiri::HTML(iframe).at_xpath('//iframe')
iframe["autoplay"] = ""
puts iframe.to_s

---------- output ----------

"<iframe src="..." autoplay=""></iframe>"

Nokogiri是否有这样的方法来实现这个，还是我应该在结尾处用正则表达式删除“/ =“” /”？谢谢。

- Luccas

Answer 1

"Nokogiri不能直接实现您想要的功能，需要进一步处理。"

• Option 1: use your regex solution.

• Option 2: HTML syntax says that a boolean attribute can be set to its own value, thus this is legal and fine to do in your code:

  iframe["autoplay"] = "autoplay"
  

  Output:

  <iframe src="..." autoplay="autoplay"></iframe>
  

• Option 3: alter the Nokogiri gem code.

  $ edit nokogiri-1.6.6.2/lib/nokogiri/html/element_description_defaults.rb
  

  Find this line:

  IFRAME_ATTRS = [COREATTRS, 'longdesc', 'name', ...
  

  And insert autoplay:

  IFRAME_ATTRS = [COREATTRS, 'autoplay', 'longdesc', 'name', ...
  

  Now Nokogiri will treat autoplay as a binary attribute, as you want.

  I'm creating a pull request for your idea, to add this feature to Nokogiri for everyone:

  https://github.com/sparklemotion/nokogiri/pull/1291

- joelparkerhenderson