等待网页中无头Chrome中的元素时发生超时异常 [英] Timeout exception while waiting for webpage with element in headless chrome

问题描述

以下代码使用无头镀铬，并且可以正常工作:

Following code uses non-headless chrome and it works:

import os
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait


chrome_options = Options()
chrome_options.add_argument("--headless")
chrome_options.add_argument('--start-maximized')
chrome_options.binary_location = 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'

driver = webdriver.Chrome(executable_path=os.path.abspath("C:\User\Program Files\chrome-driver\chromedriver.exe"))

driver.set_window_size(1200, 600) 

driver.get("login-url")
driver.find_element_by_id("loginId").send_keys("uname")
driver.find_element_by_id("newPassword").send_keys("pwd")
driver.find_element_by_name("submit-button").click()
driver.set_window_size(1200, 800)
WebDriverWait(driver, 10).until(EC.visibility_of_element_located((By.ID,"user-info")))

v = driver.find_element_by_xpath("//tr[4]/td[5]/span").text

print(v)

当我选择使用无头镀铬时:

When I choose to use headless chrome:

driver = webdriver.Chrome(executable_path=os.path.abspath("C:\User\Program Files\chrome-driver\chromedriver.exe"), chrome_options=chrome_options)

它引发以下异常:

Traceback (most recent call last):
  File "C:/User/workspaces/pyworkspaces/fin2/venv/process.py", line 28, in <module>
    WebDriverWait(driver, 10).until(EC.visibility_of_element_located((By.ID,"user-info")))
  File "C:\User\workspaces\pyworkspaces\fin2\venv\lib\site-packages\selenium\webdriver\support\wait.py", line 80, in until
    raise TimeoutException(message, screen, stacktrace)
selenium.common.exceptions.TimeoutException: Message: 

因此，它似乎在以下行中使用了无头的chrome失败了:

So it seems to fail on following line, in headless chrome:

WebDriverWait(driver, 10).until(EC.visibility_of_element_located((By.ID,"user-info")))

我也尝试过presence_of_element_located:

WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID,"user-info")))

但是它仍然给出TimeOutException.为什么会这样?

But it still gives TimeOutException. Why is it so?

推荐答案

代替使用presence_of_element_located()，您需要等待 visibility_of_element_located() ，并且可以使用以下

Instead of using presence_of_element_located() you need to wait for visibility_of_element_located() and you can use the following Locator Strategy:

• 使用ID:

element = WebDriverWait(driver, 10).until(EC.visibility_of_element_located((By.ID,"user-info")))

使用CSS_SELECTOR:

element = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "#user-info")))

使用XPATH:

element = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//*[@id='user-info']")))

注意:您必须添加以下导入:

Note : You have to add the following imports :

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

这篇关于等待网页中无头Chrome中的元素时发生超时异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！