Data extraction using Scrubyt


#1

Hi All,

I need to fetch some information from http://www.ebay.in.
My required fields are : Name of the product, Image, Price and the link
to that product.

am able to get the data using this method.
require ‘rubygems’
require ‘scrubyt’

google_data = Scrubyt::Extractor.define do
fetch ‘http://www.ebay.in
fill_textfield ‘satitle’, ‘ipod shuffle’
submit
record
“/html/body/div[2]/div[4]/div[2]/div/div/div[2]/div[2]/div/div/div[3]/div/div/table/tr”
do
name “/td[2]/div/a”
price “/td[5]”
image “/td/a/img” do
url “src”, :type => :attribute
end
link “/td[2]/div/a” do
url “href”, :type => :attribute
end
end
end

google_data.to_xml.write($stdout, 1)

but my problem is for some products its not working properly. (div may
be changed). is there any better solution for this?

Thanks in advance,
Vipin


#2

You need to create smarter XPaths, relying on CSS id/class attributes
or other properties rather than a full XPath from the root - for
example:

require ‘rubygems’
require ‘scrubyt’

ebay_data = Scrubyt::Extractor.define do

  fetch 'http://www.ebay.in/'
  fill_textfield 'satitle', 'ipod'
  submit

  record "//table[@class='nol']" do
    name "//td[@class='details']/div/a"
  end

end

puts ebay_data.to_xml

etc.

This way your scraper will be more robust and prone to page changes.

HTH,
Peter


http://www.rubyrailways.com
http://scrubyt.org


#3

On 2008.12.06., at 4:46, Vipin Vm wrote:

Hi Peter,

Thanks for the Help… its working fine :slight_smile:

Glad that I could help. I am just working on a new release btw, so
stay tuned!

Cheers,
Peter


http://www.rubyrailways.com
http://scrubyt.org


#4

Hi Peter,

Thanks for the Help… its working fine :slight_smile:

Vipin

Peter S. wrote:

You need to create smarter XPaths, relying on CSS id/class attributes
or other properties rather than a full XPath from the root - for
example:

require ‘rubygems’
require ‘scrubyt’

ebay_data = Scrubyt::Extractor.define do

  fetch 'http://www.ebay.in/'
  fill_textfield 'satitle', 'ipod'
  submit

  record "//table[@class='nol']" do
    name "//td[@class='details']/div/a"
  end

end

puts ebay_data.to_xml

etc.

This way your scraper will be more robust and prone to page changes.

HTH,
Peter


http://www.rubyrailways.com
http://scrubyt.org