I'm stuck not being able to parse irregularly embedded html tags. Is there a way to remove all html tags from a node and retain all text?
I'm using the code:
rows = doc.search('//table[#id="table_1"]/tbody/tr')
details = rows.collect do |row|
detail = {}
[
[:word, 'td[1]/text()'],
[:meaning, 'td[6]/font'],
].collect do |name, xpath|
detail[name] = row.at_xpath(xpath).to_s.strip
end
detail
end
Using Xpath:
[:meaning, 'td[6]/font']
generates
:meaning: ! '<font size="3">asking for information specifying <font
color="#CC0000" size="3">what is your name?</font> /what/ as in, <font color="#CC0000" size="3">I'm not sure what you mean</font>
/what/ as in <a style="text-decoration: none;" href="http://somesecretlink.com">what</a></font>
On the other hand, using Xpath:
'td/font/text()'
generates
:meaning: asking for information specifying
thus ignoring all children of the node. What I want to achieve is this
:meaning: asking for information specifying what is your name? /what/ as in, I'm not sure what you mean /what/ as in what? I can't hear you
This depends on what you need to extract. If you want all text in font elements, you can do it with the following xpath:
'td/font//text()'
It extracts all text nodes in font tags. If you want all text nodes in the cell, then:
'td//text()'
You can also call the text method on a Nokogiri node:
row.at_xpath(xpath).text
I added an answer for this same sort of question the other day. It's a very easy process.
Take a look at: Convert HTML to plain text and maintain structure/formatting, with ruby
Related
Watir
mytext =browser.element(:xpath => '//*[#id="gold"]/div[1]/h1').text
Html
<h1>
This is the text I want
<span> I do not want this text </span>
</h1>
When I run my Watir code, it selects all the text, including what is in the spans. How do I just get the text "This is the text I want", and no span text?
If you have a more complicated HTML, I find it can be easier to deal with this using Nokogiri as it provides more methods for parsing the HTML:
require 'nokogiri'
h1 = browser.element(:xpath => '//*[#id="gold"]/div[1]/h1')
doc = Nokogiri::HTML.fragment(h1.html)
mytext = doc.at('h1').children.select(&:text?).map(&:text).join.strip
Ideally start by trying to avoid using XPath. One of the most powerful features of Watir is the ability to create complicated locators without XPath syntax.
The issue is that calling text on a node gets all content within that node. You'd need to do something like:
top_level = browser.element(id: 'gold')
h1_text = top_level.h1.text
span_text = top_level.h1.span.text
desired_text = h1_text.chomp(span_text)
This is useful for top level text.
If there is only one h1, you can ommit id
#b.h1.text.remove(#b.h1.children.collect(&:text).join(' '))
Or specify it if there are more
#b.h1(id: 'gold').text.remove(#b.h1.children.collect(&:text).join(' '))
Make it a method and call it from your script with get_top_text(#b.h1) to get it
def get_top_text(el)
el.text.chomp(#b.h1.children.collect(&:text).join(' '))
end
I have HTML coming from an API that I want to clean up and format it.
I'm trying to get any <strong> tags that are the first element inside a <p> tag, and change it to be the parent of the <p> tag, and convert the <p> tag to <h4>.
For example:
<p><strong>This is what I want to pull out to an h4 tag.</strong>Here's the rest of the paragraph.</p>
becomes:
<h4>This is what I want to pull out to an h4 tag.</h4><p>Here's the rest of the paragraph.</p>
EDIT: Apologies for the nature of the question being too 'please write this for me'. I posted the solution I came up with below. I just had to take the time to really learn how Nokogiri works, but it is quite powerful and it seems like you can do almost anything with it.
doc = Nokogiri::HTML::DocumentFragment.parse(html)
doc.css("p").map do |paragraph|
first = paragraph.children.first
if first.element? and first.name == "strong"
first.name = 'h4'
paragraph.add_previous_sibling(first)
end
end
I want to scrape data using Nokogiri from some HTML:
<td data-bar="hoge" data-date="2000-01-01" class="modals"></td>
<td data-bar="fuga" data-date="2000-01-02" class="modals"></td>
I wrote:
element = page.css("td[data-bar='hoge'][data-date='2000-01-01']")
but element.length returns 0.
How do I distinguish elements having two data- attributes?
Try using XPath selectors instead. This worked for me:
element = page.xpath "//td[#data-bar='hoge'][#data-date='2000-01-01']"
In this example, the // portion will match any td element (with those attributes) in the document, which may not be desirable. In that case, you would need to write a more explicit XPath to the node.
Here's the documentation for XPath: https://www.w3.org/TR/xpath/
In the HTML example below I am trying to grab the $16.95 text in the outer span.price element and exclude the text from the inner span.sale one.
<div class="price">
<span class="sale">
<span class="sale-text">"Low price!"</span>
"$16.95"
</span>
</div>
If I was using Nokogiri this wouldn't be too difficult.
price = doc.css('sale')
price.search('.sale-text').remove
price.text
However Capybara navigates rather than removes nodes. I knew something like price.text would grab text from all sub elements, so I tried to use xpath to be more specific. p.find(:xpath, "//span[#class='sale']", :match => :first).text. However this grabs text from the inner element as well.
Finally, I tried looping through all spans to see if I could separate the results but I get an Ambiguous error.
p.find(:css, 'span').each { |result| puts result.text }
Capybara::Ambiguous: Ambiguous match, found 2 elements matching css "span"
I am using Capybara/Selenium as this is for a web scraping project with authentication complications.
There is no single statement way to do this with Capybara since the DOMs concept of innerText doesn't really support what you want to do. Assuming p is the '.price' element, two ways you could get what you want are as follows:
Since you know the node you want to ignore just subtract that text from the whole text
p.find('span.sale').text.sub(p.find('span.sale-text').text, '')
Grab the innerHTML string and parse that with Nokogiri or Capybara.string (which just wraps Nokogiri elements in the Capybara DSL)
doc = Capybara.string(p['innerHTML'])
nokogiri_fragment = doc.native
#do whatever you want with the nokogiri fragment
Hello I want to ask a question
I scrape a website with xpath ,and the result is like this:
[u'<tr>\r\n
<td>address1</td>\r\n
<td>phone1</td>\r\n
<td>map1</td>\r\n
</tr>',
u'<tr>\r\n
<td>address1</td>\r\n
<td>telephone1</td>\r\n
<td>map1</td>\r\n
</tr>'...
u'<tr>\r\n
<td>address100</td>\r\n
<td>telephone100</td>\r\n
<td>map100</td>\r\n
</tr>']
now I need to use xpath to analyze this results again.
I want to save the first to address,the second to telephone,and the last one to map
But I can't get it.
Please guide me.Thank you!
Here is code,it's wrong. it will catch another thing.
store = sel.xpath("")
for s in store:
address = s.xpath("//tr/td[1]/text()").extract()
tel = s.xpath("//tr/td[2]/text()").extract()
map = s.xpath("//tr/td[3]/text()").extract()
As you can see in scrappy documentation to work with relative XPaths you have to use .// notation to extract the elements relative to the previous XPath, if not you're getting again all elements from the whole document. You can see this sample in the scrappy documentation that I referenced above:
For example, suppose you want to extract all <p> elements inside <div> elements. First, you would get all <div> elements:
divs = response.xpath('//div')
At first, you may be tempted to use the following approach, which is wrong, as it actually extracts all <p> elements from the document, not only those inside <div> elements:
for p in divs.xpath('//p'): # this is wrong - gets all <p> from the whole document
This is the proper way to do it (note the dot prefixing the .//p XPath):
for p in divs.xpath('.//p'): # extracts all <p> inside
So I think in your case you code must be something like:
for s in store:
address = s.xpath(".//tr/td[1]/text()").extract()
tel = s.xpath(".//tr/td[2]/text()").extract()
map = s.xpath(".//tr/td[3]/text()").extract()
Hope this helps,