Scrape Dynamic contents created by Javascript using Python

The initial HTML does not contain the data you want to scrape, that’s why using only BeautifulSoup is not enough. You can load the page with Selenium and then scrape the content.

Code:

import json

from bs4 import BeautifulSoup
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.common.exceptions import TimeoutException

html = None
url="http://demo-tableau.bitballoon.com/"
selector="#dataTarget > div"
delay = 10  # seconds

browser = webdriver.Chrome()
browser.get(url)

try:
    # wait for button to be enabled
    WebDriverWait(browser, delay).until(
        EC.element_to_be_clickable((By.ID, 'getData'))
    )
    button = browser.find_element_by_id('getData')
    button.click()

    # wait for data to be loaded
    WebDriverWait(browser, delay).until(
        EC.presence_of_element_located((By.CSS_SELECTOR, selector))
    )
except TimeoutException:
    print('Loading took too much time!')
else:
    html = browser.page_source
finally:
    browser.quit()

if html:
    soup = BeautifulSoup(html, 'lxml')
    raw_data = soup.select_one(selector).text
    data = json.loads(raw_data)

    import pprint
    pprint.pprint(data)

Output:

[[{'formattedValue': 'Atlantic', 'value': 'Atlantic'},
  {'formattedValue': '6/26/2010 3:00:00 AM', 'value': '2010-06-26 03:00:00'},
  {'formattedValue': 'ALEX', 'value': 'ALEX'},
  {'formattedValue': '16.70000', 'value': '16.7'},
  {'formattedValue': '-84.40000', 'value': '-84.4'},
  {'formattedValue': '30', 'value': '30'}],
  ...
]

The code assumes that the button is initially disabled: <button id="getData" onclick="getUnderlyingData()" disabled>Get Data</button> and data is not loaded automatically, but due to the button being clicked. Therefore you need to delete this line: setTimeout(function(){ getUnderlyingData(); }, 3000);.

You can find a working demo of your example here: http://demo-tableau.bitballoon.com/.