how to retrieve what's in a data_value ? With selenium in python?

Question

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import time
path = "c:/users/admin/appdata/local/programs/python/python38-32/chromedriver.exe"
driver = webdriver.Chrome(path)


driver.get("https://donboscosdw.smartschool.be/login")

# Input fields
username = driver.find_element_by_name("login_form[_username]")
password = driver.find_element_by_name("login_form[_password]")
time.sleep(2)

username.clear()
password.clear()

# Login to website 
username.send_keys("...")
password.send_keys("...")
username.send_keys(Keys.RETURN)


class Notifications:
    ls = []

    # check for new messages 

    messages=driver.find_element_by_xpath('//*[@id="smscTopContainer"]/nav/div[4]/button/span').get_property('data_value')
    print(type(messages))

i want selenium to open my messages if i get a new one. But when i try to get the data_value . It returns None. But i want to retrieve whatever is in the data_value .

you're sure the value is in the data_value attribute. You can see it in the HTML — masonCherry
– masonCherry, Commented Jun 26, 2020 at 23:22
@MrBrN197 yes : whenever i receive a new message the value in data_value increase. ps. the value in data_value that i'm trying to get is a integer . — bliboy
– bliboy, Commented Jun 26, 2020 at 23:53
When you say It returns NoValue. I've never seen that in python... Can you tell me the exact Result. is It None — masonCherry
– masonCherry, Commented Jun 27, 2020 at 0:05
@MrBrN197 I am terrible sorry. I wrote the wrong thing , yes i meant to say None. Once again i am sorry . — bliboy
– bliboy, Commented Jun 27, 2020 at 0:22

E.Wiest · Accepted Answer · 2020-06-27 02:48:22Z

1

You probably need to activate WebDriverWait and expected_conditions before getting the data.

With the following imports :

from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

You can write :

email = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.xpath, "//*[@id='smscTopContainer']/nav/div[4]/button/span"))).get_attribute("value")
print (email)

answered Jun 27, 2020 at 2:48

E.Wiest

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1 Comment

undetected Selenium Over a year ago

@bliboy While using Selenium, this approach within this answer should be the ideal way.

Nimantha · Accepted Answer · 2021-10-28 17:04:41Z

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import time
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
path = "c:/users/admin/appdata/local/programs/python/python38-32/chromedriver.exe"
driver = webdriver.Chrome(path)


driver.get("https://donboscosdw.smartschool.be/login")

# Input fields
username = driver.find_element_by_name("login_form[_username]")
password = driver.find_element_by_name("login_form[_password]")
time.sleep(2)

username.clear()
password.clear()

# Login to website
username.send_keys("...")
password.send_keys("...")
username.send_keys(Keys.RETURN)

# check for a new message 

class Notifications:
    email = WebDriverWait(driver, 20).until(EC.visibility_of_element_located(
        (By.XPATH, "//*[@id='smscTopContainer']/nav/div[4]/button/span"))).get_attribute('innerHTML')
    email = str(email)

    # if i have received new message open mail ,else print no message

    if email > str("0"):
        open_email = driver.find_element_by_xpath('//*[@id="smscTopContainer"]/nav/div[4]/button')
        open_email.send_keys(Keys.RETURN)
    else : 
        print("No New Messages")

I found a solution to the problem . You need to use .get_attribute('innerHTML'). which will return the value in the data_value and not a NoneType.

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