Scraping data out of facebook using scrapy - facebook

Question

The new graph search on facebook lets you search for current employees of a company using query token - Current Google employees (for example).
I want to scrape the results page (http://www.facebook.com/search/104958162837/employees/present) via scrapy.
Initial problem was facebook allows only a facebook user to access the information, so directing me to login.php. So, before scraping this url, I logged in via scrapy and then this result page. But even though the http response is 200 for this page, it does not scraps any data. The code is as follows:
import sys
from scrapy.spider import BaseSpider
from scrapy.http import FormRequest
from scrapy.selector import HtmlXPathSelector
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.selector import HtmlXPathSelector
from scrapy.item import Item
from scrapy.http import Request
class DmozSpider(BaseSpider):
name = "test"
start_urls = ['https://www.facebook.com/login.php'];
task_urls = [query]
def parse(self, response):
return [FormRequest.from_response(response, formname='login_form',formdata={'email':'myemailid','pass':'myfbpassword'}, callback=self.after_login)]
def after_login(self,response):
if "authentication failed" in response.body:
self.log("Login failed",level=log.ERROR)
return
return Request(query, callback=self.page_parse)
def page_parse(self,response):
hxs = HtmlXPathSelector(response)
print hxs
items = hxs.select('//div[#class="_4_yl"]')
count = 0
print items
What could I have missed or done incorrectly?

Answer 1

The problem is that search results (specifically div initial_browse_result) are loaded dynamically via javascript. Scrapy receives the page before those actions, so there is no results yet there.
Basically, you have two options here:
try to simulate these js (XHR) requests in scrapy, see:
Scraping ajax pages using python
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
use the combination of scrapy and selenium, or scrapy and mechanize to load the whole page with the content, see:
Executing Javascript Submit form functions using scrapy in python
this answer
If you go with first option, you should analyze all requests going during the page load and figure out which one is responsible for getting the data you want to scrape.
The second is pretty straightforward, but will definitely work - you just use other tool to get the page with loaded via js data, then parse it to scrapy items.
Hope that helps.