Python Forum

I want my script repeatedly to check for the existence of some element on a fully loaded page and
return only when that element exists.

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC  
import time
options = Options()
options.add_argument("--headless")
caps = webdriver.DesiredCapabilities().FIREFOX
caps["marionette"] = True
browser = webdriver.Firefox(firefox_options=options, capabilities=caps, executable_path=r"geckodriver.exe")
browser.get("http://pythonscraping.com/pages/javascript/ajaxDemo.html")
try:
	element = WebDriverWait(browser, 10).until(EC.presence_of_element_located(By.ID, "loadedButton"))
finally:
	print(browser.find_element_by_id("content").text)
	browser.close()

Error:
Traceback (most recent call last):
  File "C:\Python36\kodovi\wbp.py", line 184, in <module>
    element = WebDriverWait(browser, 10).until(EC.presence_of_element_located(By
.ID, "loadedButton"))
TypeError: __init__() takes 2 positional arguments but 3 were given

What am I doing wrong?

you have 'By .ID...'
isn't it BY ID? (no dot)

Missing a couple of ().

element = WebDriverWait(browser, 10).until(EC.presence_of_element_located((By.ID, "loadedButton")))

snippsat, correct. Thank you, although I don't understand why do we need double brackets.

Larz, By.ID is correct. it's called Locator.

I use it, senior moment.