问题
I have an html element like:
<div id="spam[500]">
I want to search for this element by id, but it seems that nokogiri is getting confused by the []. I'm trying:
doc.css("#spam[#{eggs.id}]")
but to no avail.
回答1:
Chris, try this and let me know if it works:
doc = Nokogiri::HTML(page)
el = doc.xpath("//div[@id='spam[500]']").first
The problem is that you can't access it via CSS (even in the browser). Try setting some CSS attributes for "spam[500]" and they won't be applied. You can access via xpath however, as shown above.
回答2:
The real problem here is that the characters [ and ] are illegal in an HTML4 (or XML) id attribute - look at the following:
http://www.w3.org/TR/html401/types.html#type-name
(for the normative definition of the id attribute look at www.w3.org//TR/html401/struct/global.html#adef-id)
回答3:
you can also do it this way
el = doc.xpath("id(spam[500])").first
for elements having id's you can call them directly through id because its always unique.
for finding out xpaths, please add a 'xpath checker' plugin to firefox. It helps a lot and very easy
来源：https://stackoverflow.com/questions/1235774/find-tag-with-id-including-with-nokogiri