Youtube comment use selenium - xpath

Question

import subprocess
import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
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.webdriver.chrome.options import Options
subprocess.Popen(r'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe --remote-debugging-port=9222 --user-data-dir="C:\chrometemp"') # 디버거 크롬 구동
option = Options()
option.add_experimental_option("debuggerAddress", "127.0.0.1:9222")
driver = webdriver.Chrome('chromedriver', options = option)
url = 'https://www.youtube.com/watch?v=_XulUbBra5M'
driver.get(url)
driver.maximize_window() # 크롬 창 크기 최대화
driver.implicitly_wait(3) # 페이지 로드까지 3초간 기다림
heihgt = driver.execute_script(
"return document.documentElement.scrollHeight"
)
# 기존 위치
stand_height = 0
while True:
# 현재 높이
current_height = driver.execute_script(
"return document.documentElement.scrollHeight"
)
driver.execute_script(
f"window.scrollTo(0, {stand_height});" #스크롤 내리기
)
time.sleep(1)
# 스크롤 내린 페이지의 높이
new_page_height = driver.execute_script(
"return document.documentElement.scrollHeight"
)
stand_height = heihgt
heihgt = new_page_height
time.sleep(1)
driver.find_element(By.XPATH, "//*[#id='contenteditable-root']")
#driver.close()
I'm making a program that uses crawling to comment comments, but when I find the location of comments with xpath, I get the following error: I don't know why.
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":"//*[#id='contenteditable-root']"}
(Session info: chrome=96.0.4664.110)
Python does not support driver.find_element_by_xpath , it supports driver.find(By.XPATH,) . Does this cause an error? please tell me why

Answer 1

The input element to insert a new comment is not initially loaded on the page.
To make this element loaded you need to scroll the page down.
Also, to make the actual input comment element to be interactable you first need to click another element.
This should work:
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
url = 'https://www.youtube.com/watch?v=_XulUbBra5M'
driver.get(url)
wait = WebDriverWait(driver, 20)
wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, "button.ytp-play-button")))
driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
wait.until(EC.visibility_of_element_located((By.XPATH, "//*[#id='simplebox-placeholder']"))).click()
wait.until(EC.visibility_of_element_located((By.XPATH, "//*[#id='contenteditable-root']"))).send_keys(your_comment_text)