如何找到硒中动态元素的起始值?

Question

我试图在以下网站获得定时器的值:https://userinyerface.com/game.html计时器从零开始，但问题是，当我使用以下python代码检索带有selenium的计时器:

def setUp(self):
self.driver = webdriver.Chrome()
def test_path(self):
driver = self.driver
driver.get("https://userinyerface.com/game.html")
try:
timer_is_displayed = WebDriverWait(driver,
10).until(EC.visibility_of_element_located((By.XPATH, '//div//div[1]//div[2]//div[2]                                 //div')))
timer = driver.find_element(By.XPATH, '//div//div[1]//div[2]//div[2]//div')
print(timer.text)
finally:
driver.quit()

将计时器打印为00:00:02，如果add time.sleep(1)，则返回一个错误，因为页面在查找元素之前没有时间加载。如果我执行time.sleep(2)，它返回00:00:02，我如何检查计时器是从00:00:00开始的?有没有办法找到那个特定元素的初始值?

我已经尝试使用显式等待，但无济于事。

Answer 1

您不需要也不应该硬编码暂停。
应选用WebDriverWaitexpected_conditions。
你需要等待的时刻，当页面加载和计时器元素是可见.
这时需要从那里取值。
下面的代码可以工作:

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
options = Options()
options.add_argument("start-maximized")
webdriver_service = Service('C:webdriverschromedriver.exe')
driver = webdriver.Chrome(options=options, service=webdriver_service)
wait = WebDriverWait(driver, 30)
url = "https://userinyerface.com/game.html"
driver.get(url)
initial_value = wait.until(EC.visibility_of_element_located((By.CLASS_NAME, "timer"))).text
print(initial_value)

输出为:

00:00:00

乌利希期刊指南您也可以使用XPath或CSS选择器定位计时器元素。如何定位元素不是问题，关键是使用WebDriverWaitexpected_conditions。
例如，您可以使用这一行:

initial_value = wait.until(EC.visibility_of_element_located((By.XPATH, "//div[@class='timer timer--white timer--center']"))).text

的Insteaqd

initial_value = wait.until(EC.visibility_of_element_located((By.CLASS_NAME, "timer"))).text

给出完全相同的结果。

Answer 2

获取定时器的初始值，即00:00:00从网站你需要诱导WebDriverWait为presence_of_element_located()，你可以使用以下任何一个定位策略:

• 使用CSS_SELECTOR和timerclass:

  driver.get("https://userinyerface.com/game.html")
  print(WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.CSS_SELECTOR, "div.timer"))).text) #00:00:00
  

• 使用CSS_SELECTOR和timer--whiteclass:

  driver.get("https://userinyerface.com/game.html")
  print(WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.CSS_SELECTOR, "div.timer--white"))).text) #00:00:00
  

• 使用CSS_SELECTOR和timer--centerclass:

  driver.get("https://userinyerface.com/game.html")
  print(WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.CSS_SELECTOR, "div.timer--center"))).text) #00:00:00
  

• 使用CSS_SELECTOR和所有类:

  driver.get("https://userinyerface.com/game.html")
  print(WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.CSS_SELECTOR, "div.timer.timer--white.timer--center"))).text) #00:00:00
  

• 使用visbility_of_element_located ()和CSS_SELECTOR:

  driver.get("https://userinyerface.com/game.html")
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "div.timer.timer--white.timer--center"))).text) #00:00:00
  

• 注意:您必须添加以下导入:

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