title: Slow scrolling down the page using Selenium
body: <p>I'm trying to scrape some data from flight search page. </p>
  
  <p>This page works this way: </p>
  
  <p>You fill in a form and then you click on the button search - this is ok. When you click the button you are redirected to the page with results and here is the problem. This page is adding continuously results for example for one minute which is not a big deal - problem is to get all of these results. When you are in real browser, you have to scroll down the page and these results are appearing. So I've tried to scroll down using Selenium. It scrolls down at the bottom of the page probably so fast or it is a jump instead of scrolling that the page doesn't load any new results. </p>
  
  <p>When you are scrolling down slowly, it reloads results but if you do it very quickly it stops loading.</p>
  
  <p>I'm not sure if my code helps to understand that so I'm attaching it.</p>
  
  <pre><code>SEARCH_STRING = """URL"""
  
  class spider():
  
      def __init__(self):
          self.driver = webdriver.Firefox()
  
      @staticmethod
      def prepare_get(dep_airport,arr_airport,dep_date,arr_date):
          string = SEARCH_STRING%(dep_airport,arr_airport,arr_airport,dep_airport,dep_date,arr_date)
          return string
  
  
      def find_flights_html(self,dep_airport, arr_airport, dep_date, arr_date):
          if isinstance(dep_airport, list):
              airports_string = str(r'%20').join(dep_airport)
              dep_airport = airports_string
  
          wait = WebDriverWait(self.driver, 60) # wait for results
          self.driver.get(spider.prepare_get(dep_airport, arr_airport, dep_date, arr_date))
          wait.until(EC.invisibility_of_element_located((By.XPATH, '//img[contains(@src, "loading")]')))
          wait.until(EC.invisibility_of_element_located((By.XPATH, u'//div[. = "Poprosíme o trpezlivosť, hľadáme pre Vás ešte viac letov"]/preceding-sibling::img')))
          self.driver.execute_script("window.scrollTo(0,document.body.scrollHeight);")
  
          self.driver.find_element_by_xpath('//body').send_keys(Keys.CONTROL+Keys.END)
          return self.driver.page_source
  
      @staticmethod 
      def get_info_from_borderbox(div):
          arrival = div.find('div',class_='departure').text
          price = div.find('div',class_='pricebox').find('div',class_=re.compile('price'))
          departure = div.find_all('div',class_='departure')[1].contents
          date_departure = departure[1].text 
          airport_departure = departure[5].text
          arrival = div.find_all('div', class_= 'arrival')[0].contents
          date_arrival = arrival[1].text
          airport_arrival = arrival[3].text[1:]
          print 'DEPARTURE: ' 
          print date_departure,airport_departure
          print 'ARRIVAL: '
          print date_arrival,airport_arrival
  
      @staticmethod
      def get_flights_from_result_page(html):
  
          def match_tag(tag, classes):
              return (tag.name == 'div'
                      and 'class' in tag.attrs
                      and all([c in tag['class'] for c in classes]))
  
          soup = mLib.getSoup_html(html)
          divs = soup.find_all(lambda t: match_tag(t, ['borderbox', 'flightbox', 'p2']))
  
          for div in divs:
              spider.get_info_from_borderbox(div)
  
          print len(divs)
  
  
  spider_inst = spider() 
  
  print spider.get_flights_from_result_page(spider_inst.find_flights_html(['BTS','BRU','PAR'], 'MAD', '2015-07-15', '2015-08-15'))
  </code></pre>
  
  <p>So the main problem is in my opinion that it scrolls too fast to trigger new loading of the results. </p>
  
  <p>Have you any idea how to make it work?</p>