Wait until loader disappears python selenium

Answer 1

The following code creates an infinite loop until the element disappears:

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

while True:
        try:
            WebDriverWait(driver, 1).until(EC.presence_of_element_located((By.XPATH, 'your_xpath')))
        except TimeoutException:
            break

Answer 2

Use expected condition : invisibility_of_element_located

This works fine for me.

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


WebDriverWait(driver, timeout).until(EC.invisibility_of_element_located((By.ID, "loader-mid")))

Answer 3

Reiterated your answer (with some error handling) to make it easier for people to find the solution :)

Importing required classes:

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

Configuration variables:

SHORT_TIMEOUT  = 5   # give enough time for the loading element to appear
LONG_TIMEOUT = 30  # give enough time for loading to finish
LOADING_ELEMENT_XPATH = '//*[@id="xPath"]/xPath/To/The/Loading/Element'

Code solution:

try:
    # wait for loading element to appear
    # - required to prevent prematurely checking if element
    #   has disappeared, before it has had a chance to appear
    WebDriverWait(driver, SHORT_TIMEOUT
        ).until(EC.presence_of_element_located((By.XPATH, LOADING_ELEMENT_XPATH)))

    # then wait for the element to disappear
    WebDriverWait(driver, LONG_TIMEOUT
        ).until_not(EC.presence_of_element_located((By.XPATH, LOADING_ELEMENT_XPATH)))

except TimeoutException:
    # if timeout exception was raised - it may be safe to 
    # assume loading has finished, however this may not 
    # always be the case, use with caution, otherwise handle
    # appropriately.
    pass