How do I omit script elements from HTML using XPath in Nokogiri in Ruby on Rails?
Say I start with everything inside the body element:
Nokogiri::HTML( doc ).xpath( "/html/body/node()" ).to_html
which contains some <script> and开发者_运维技巧 <noscript>. How do I get rid of these?
You might want to change your XPath expression to:
Nokogiri::HTML( doc ).xpath( "/html/body/node()[not(self::script or self::noscript)]" ).to_html
#!/usr/bin/env ruby
require 'nokogiri'
html = <<EOT
<html>
<head>
<script>
<!-- dummy script !>
</script>
</head>
<body>
<script><!-- dummy script !></script>
<noscript>dummy script</noscript>
</body>
</head>
EOT
doc = Nokogiri::HTML(html)
Here's the gist of it:
doc.at('body').search('script,noscript').remove
puts doc.to_xml
>> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
>> <html>
>> <head>
>> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
>> <script>
>> <!-- dummy script !>
>> </script>
>> </head>
>> <body>
>>
>> </body>
>> </html>
For simplicity, I'm using Nokogiri's ability to use CSS accessors, rather than XPath.
doc.at('body').search('script,noscript').remove
looks for the first occurrence of the <body> tag, then looks inside for all <script> and <noscript> tags, removing them.
The gap between the resulting <body> tags are the result of the carriage returns in text nodes that trailed the actual target tags.
加载中,请稍侯......
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