I want to Extract the Members Home sites links from a site.
Looks like this
<a href="http://www.ptop.se" target="_blank">
i tested with it this site
http://www.rubular.com/
<a href="(.*?)" target="_blank">
Shall output http://www.ptop.se,
Here comes the code
require 'open-uri'
url = "http://itproffs.se/forumv2/showprofile.aspx?memid=2683"
open(url) { |page| content = page.read()
links = content.scan(/<a href="(.*?)" target="_blank">/)
links.each {|link| puts #{link}
}
}
if you run this, it dont works. why not?
I would suggest that you use one of the good ruby HTML/XML parsing libraries e.g. Hpricot or Nokogiri.
If you need to log in on the site you might be interested in a library like WWW::Mechanize.
Code example:
require "open-uri"
require "hpricot"
require "nokogiri"
url = "http://itproffs.se/forumv2"
# Using Hpricot
doc = Hpricot(open(url))
doc.search("//a[#target='_blank']").each { |user| puts "found #{user.inner_html}" }
# Using Nokogiri
doc = Nokogiri::HTML(open(url))
doc.xpath("//a[#target='_blank']").each { |user| puts "found #{user.text}" }
Several issues with your code
I don't know what you mean by using
{link}. But if you want to append a '#' character to the link make sure
you wrap that with quotes. ie
"#{link}"
String.scan accepts a block. Use it
to loop through the matches.
The page you are trying to access
does not return any links that the
regex would match anyway.
Here's something that would work:
require 'open-uri'
url = "http://itproffs.se/forumv2/"
open(url) do |page|
content = page.read()
content.scan(/<a href="(.*?)" target="_blank">/) do |match|
match.each { |link| puts link}
end
end
There're better ways to do it, I am sure. But this should work.
Hope it helps
Related
I want to get taobao's list of URL of products on search result page without taobao API.
I tried following Ruby script.
require "open-uri"
require "rubygems"
require "nokogiri"
url='https://world.taobao.com/search/search.htm?_ksTS=1517338530524_300&spm=a21bp.7806943.20151106.1&search_type=0&_input_charset=utf-8&navigator=all&json=on&q=%E6%99%BA%E8%83%BD%E6%89%8B%E8%A1%A8&cna=htqfEgp0pnwCATyQWEDB%2FRCE&callback=__jsonp_cb&abtest=_AB-LR517-LR854-LR895-PR517-PR854-PR895'
charset = nil
html = open(url) do |f|
charset = f.charset
f.read
end
doc = Nokogiri::HTML.parse(html, nil, charset)
p doc.xpath('//*[#id="list-itemList"]/div/div/ul/li[1]/div/div[1]/div/a/#href').each{|i| puts i.text}
# => 0
I want to get list of URL like https://click.simba.taobao.com/cc_im?p=%D6%C7%C4%DC%CA%D6%B1%ED&s=328917633&k=525&e=lDs3%2BStGrhmNjUyxd8vQgTvfT37ERKUkJtUYVk0Fu%2FVZc0vyfhbmm9J7EYm6FR5sh%2BLS%2FyzVVWDh7%2FfsE6tfNMMXhI%2B0UDC%2FWUl0TVvvELm1aVClOoSyIIt8ABsLj0Cfp5je%2FwbwaEz8tmCoZFXvwyPz%2F%2ByQnqo1aHsxssXTFVCsSHkx4WMF4kAJ56h9nOp2im5c3WXYS4sLWfJKNVUNrw%2BpEPOoEyjgc%2Fum8LOuDJdaryOqOtghPVQXDFcIJ70E1c5A%2F3bFCO7mlhhsIlyS%2F6JgcI%2BCdFFR%2BwwAwPq4J5149i5fG90xFC36H%2B6u9EBPvn2ws%2F3%2BHHXRqztKxB9a0FyA0nyd%2BlQX%2FeDu0eNS7syyliXsttpfoRv3qrkLwaIIuERgjVDODL9nFyPftrSrn0UKrE5HoJxUtEjsZNeQxqovgnMsw6Jeaosp7zbesM2QBfpp6NMvKM5e5s1buUV%2F1AkICwRxH7wrUN4%2BFn%2FJ0%2FIDJa4fQd4KNO7J5gQRFseQ9Z1SEPDHzgw%3D however I am getting 0
What should I do?
I don't know taobao.com but the page seems like its running lots of javascript. So perhaps the content can actually not be retrieved with a client without javascript capabilities. So instead of open-uri, you could try the gem selenium-webdriver:
https://rubygems.org/gems/selenium-webdriver/versions/2.53.4
I am parsing prada.com and would like to scrape data in the div class "nextItem" and get its name and price. Here is my code:
require 'rubygems'
require 'mechanize'
require 'nokogiri'
require 'open-uri'
agent = Mechanize.new
page = agent.get('http://www.prada.com/en/US/e-store/department/woman/handbags.html?cmp=from_home')
fp = File.new('prada_prices','w')
html_doc = Nokogiri::HTML(page)
page = html_doc.xpath("//ol[#class='nextItem']")
page.each do {|i| fp.write(i.text + "\n")}
end
I get an error and no output. What I think I am doing is instantiating a mechanize object and calling it agent.
Then creating a page variable and assigning it the url provided.
Then creating a variable that is a nokogiri object with the mechanize url passed in
Then searching the url for all class references that are titled nextItem
Then printing all the data contained there
Can someone show me where I might have went wrong?
Since Prada's website dynamically loads its content via JavaScript, it will be hard to scrape its content. See "Scraping dynamic content in a website" for more information.
Generally speaking, with Mechanize, after you get a page:
page = agent.get(page_url)
you can easily search items with CSS selectors and scrape for data:
next_items = page.search(".fooClass")
next_items.each do |item|
price = item.search(".fooPrice").text
end
Then simply handle the strings or generate hashes as you desire.
Here are the wrong parts:
Check again the block syntax - use {} or do/end but not both in the same time.
Mechanize#get returns a Mechanize::Page which act as a Nokogiri document, at least it has search, xpath, css. Use them instead of trying to coerce the document to a Nokogiri::HTML object.
There is no need to require 'open-uri', and require 'nokogiri' when you are not using them directly.
Finally check maybe more about Ruby's basics before continuing with web scraping.
Here is the code with fixes:
require 'rubygems'
require 'mechanize'
agent = Mechanize.new
page = agent.get('http://www.prada.com/en/US/e-store/department/woman/handbags.html?cmp=from_home')
fp = File.new('prada_prices','w')
page = page.search("//ol[#class='nextItem']").each do |i|
fp.write(i.text + "\n")
end
fp.close
What I am trying to do: Parse links from website (http://nytm.org/made-in-nyc) that all have the exact same content. "(hiring)" Then I will write to a file 'jobs.html' a list of links. (If it is a violation to publish these websites I will quickly take down the direct URL. I thought it might be useful as a reference to what I am trying to do. First time posting on stack)
DOM Structure:
<article>
<ol>
<li>#waywire</li>
<li><a href="http://1800Postcards.com" target="_self" class="vt-p">1800Postcards.com</a</li>
<li>Adafruit Industries</li>
<li><a href="http://www.adafruit.com/jobs/" target="_self" class="vt-p">(hiring)</a</li>
etc...
What I have tried:
require 'nokogiri'
require 'open-uri'
def find_jobs
doc = Nokogiri::HTML(open('http://nytm.org/made-in-nyc'))
hire_links = doc.css("a").select{|link| link.text == "(hiring)"}
results = hire_links.each{|link| puts link['href']}
begin
file = File.open("./jobs.html", "w")
file.write("#{results}")
rescue IOError => e
ensure
file.close unless file == nil
end
puts hire_links
end
find_jobs
Here is a Gist
Example Result:
[344] #<Nokogiri::XML::Element:0x3fcfa2e2276c name="a" attributes=[#<Nokogiri::XML::Attr:0x3fcfa2e226e0 name="href" value="http://www.zocdoc.com/careers">, #<Nokogiri::XML::Attr:0x3fcfa2e2267c name="target" value="_blank">] children=[#<Nokogiri::XML::Text:0x3fcfa2e1ff1c "(hiring)">]>
So it successfully writes these entries into the jobs.html file but it is in XML format? Not sure how to target just the value and create a link from that. Not sure where to go from here. Thanks!
The problem is with how results is defined. results is an array of Nokogiri::XML::Element:
results = hire_links.each{|link| puts link['href']}
p results.class
#=> Array
p results.first.class
#=> Nokogiri::XML::Element
When you go to write the Nokogiri::XML::Element to the file, you get the results of inspecting it:
puts results.first.inspect
#=> "#<Nokogiri::XML::Element:0x15b9694 name="a" attributes=...."
Given that you want the href attribute of each link, you should collect that in the results instead:
results = hire_links.map{ |link| link['href'] }
Assuming you want each href/link displayed as a line in the file, you can join the array:
File.write('./jobs.html', results.join("\n"))
The modified script:
require 'nokogiri'
require 'open-uri'
def find_jobs
doc = Nokogiri::HTML(open('http://nytm.org/made-in-nyc'))
hire_links = doc.css("a").select { |link| link.text == "(hiring)"}
results = hire_links.map { |link| link['href'] }
File.write('./jobs.html', results.join("\n"))
end
find_jobs
#=> produces a jobs.html with:
#=> http://www.20x200.com/jobs/
#=> http://www.8coupons.com/home/jobs
#=> http://jobs.about.com/index.html
#=> ...
Try using Mechanize. It leverages Nokogiri, and you can do something like
require 'mechanize'
browser = Mechanize.new
page = browser.get('http://nytm.org/made-in-nyc')
links = page.links_with(text: /(hiring)/)
Then you will have an array of link objects that you can get whatever info you want. You can also use the link.click method that Mechanize provides.
I want to print the contents of an XPath node. Here is what I have:
require "mechanize"
agent = Mechanize.new
agent.get("http://store.steampowered.com/promotion/snowglobefaq")
puts agent.xpath("//*[#id='item_52b3985a70d58']/div[4]")
This returns: <main>: undefined method xpath for #<Mechanize:0x2fa18c0> (NoMethodError).
I just started using Mechanize and have no idea what I'm doing, however, I've used Watir and thought this would work but it didn't.
You an use Nokogiri to parse the page after retrieving it. Here is the example code:
m = Mechanize.new
result = m.get("http://google.com")
html = Nokogiri::HTML(result.body)
divs = html.xpath('//div').map { |div| div.content } # here you can do whatever is needed with the divs
# I've mapped their content into an array
There are two things wrong:
The ID doesn't exist on that page. Try this to see the list of tag IDs available:
require "open-uri"
require 'nokogiri'
doc = Nokogiri::HTML(open("http://store.steampowered.com/promotion/snowglobefaq"))
puts doc.search('[id*="item"]').map{ |n| n['id'] }.sort
The correct chain of methods is agent.page.xpath.
Because there is no sample HTML showing exactly which tag you want, we can't help you much.
How do you search a Websites source code with ruby, hard to explain but heres the code for doing it in python
import urllib2, re
word = "How to ask"
source = urllib2.urlopen("http://stackoverflow.com").read()
if re.search(word,source):
print "Found it "+word
Here's one way:
require 'open-uri'
word = "How to ask"
open('http://stackoverflow.com') do |f|
puts "Found it #{word}" if f.read =~ /#{word}/
end
If all you want to do is search jcrossley3 gave you your answere. If you want to do something more complicated you should look at an HTML parser that can let you treat the website like a DOM Tree. Have a look at why´s great hpricot gem to do just that.
require 'hpricot'
require 'open-uri'
doc = open("http://qwantz.com/") { |f| Hpricot(f) }
doc.search("//p[#class='posted']")
(doc/"p/a/img").each do |img|
puts img.attributes['class']
end