Get all elements by partial match of class attribute
I'm trying to use Nokogiri to display results from a URL. (essentially scraping a URL).
I have some HTML which is similar to:
<p class="mattFacer">Matty</p>
<p class="mattSmith">Matthew</p>
<p class="suzieSmith">Suzie</p>
So I need to then find all the elements which begin with the word "matt". What I need to do is save the value of the element and the element name so I can reference it next time.. so I need to capture
"Matty" and "<p class='mattFacer'>"
"Matthew" and "<p class='mattSmith'>"
I haven't worked out how to capture the element HTML, but here's what I have so far for the element (It doesnt work!)
doc = Nokogiri::HTML(open(url))
tmp = ""
doc.xpath("[class*=matt").each do |it开发者_运维知识库em|
tmp += item.text
end
@testy2 = tmp
This should get you started:
doc.xpath('//p[starts-with(@class, "matt")]').each do |el|
p [el.attributes['class'].value, el.children[0].text]
end
["mattFacer", "Matty"]
["mattSmith", "Matthew"]
Use:
/*/p[starts-with(@class, 'matt')] | /*/p[starts-with(@class, 'matt')]/text()
This selects any p elements that is a child of the top element of the XML document and the value of whose class attribute starts with "matt" and any text-node child of any such p element.
When evaluated against this XML document (none was provided!):
<html>
<p class="mattFacer">Matty</p>
<p class="mattSmith">Matthew</p>
<p class="suzieSmith">Suzie</p>
</html>
the following nodes are selected (each on a separate line) and can be accessed by position:
<p class="mattFacer">Matty</p>
Matty
<p class="mattSmith">Matthew</p>
Matthew
Here is a quick XSLT verification:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/">
<xsl:for-each select=
"/*/p[starts-with(@class, 'matt')]
|
/*/p[starts-with(@class, 'matt')]/text()
">
<xsl:copy-of select="."/>
<xsl:text>
</xsl:text>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
The result of this transformation, when applied on the same XML document (above) is the expected, correct sequence of selected nodes:
<p class="mattFacer">Matty</p>
Matty
<p class="mattSmith">Matthew</p>
Matthew
doc = Nokogiri::HTML(open(url))
tmp = ""
items = doc.css("p[class*=matt]").map(&:text).join
The accepted answer is great, but another approach would be to use Nikkou, which lets you match via regular expressions (without needing to be familiar with XPATH functions):
doc.attr_matches('class', /^matt/).collect do |item|
[item.attributes['class'].value, item.text]
end
加载中,请稍侯......
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