消息:没有这样的元素:无法定位元素 Selenium Python

Message: no such element: Unable to locate element Selenium Python

我试图点击一个按钮,但收到此错误消息: 我试图点击的元素在页面上确实存在,但我不确定为什么它说该元素不存在:

Message: no such element: Unable to locate element: {"method":"xpath","selector":"//button[@class="vote_button mfp-voteText"]"}

下面是我的代码:

driver.get('https://trupanion.com/canada/members/contest?pixlee_album_photo_id=427049511')

time.sleep(10)

try:
    vote = driver.find_element_by_xpath('//button[@class="vote_button mfp-voteText"]')
    vote.click()
except Exception as e:
    print(e)

下面是 chrome 开发工具中的 XPath,显示它是正确的:

它在<frame>标签内,先切换它:

driver.get('https://trupanion.com/canada/members/contest?pixlee_album_photo_id=427049511')

time.sleep(10)

try:
    #switch it first
    driver.switch_to.frame(driver.find_element_by_id('pixlee_lightbox_iframe'))
    vote = driver.find_element_by_xpath('//button[@class="vote_button mfp-voteText"]')
    vote.click()
except Exception as e:
    print(e)

但注意 time.sleep(..) 是个坏主意。

你可以在这里学习selenium等待:

selenium-python.readthedocs.io/waits.html

然后切换帧:

.frame_to_be_available_and_switch_to_it

虽然您的 xpath 可以工作,但 css 选择器看起来更好:

vote = driver.find_element_by_css_selector('button.vote_button.mfp-voteText')

尝试在 WebdriverWait() 函数中使用 css selector 而不是 XPATH。它将等待 X 秒让元素可点击,并在元素出现后立即点击它。但是,您需要切换到必须通过 frame 选择器找到的框架。

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

self.webdriver.switch_to_frame(self.webdriver.find_element_by_css_selector('frame'))
try:
    WebDriverWait(webdriver,time).until(EC.element_to_be_clickable((By.CSS_SELECTOR,path)))
except Exception as e:
   print(e)

所需元素在 <iframe> 中,因此您必须:

  • 诱导 WebDriverWait 所需的 帧可用并切换到它.

  • 诱导 所需的 元素可点击

  • 您可以使用以下任一项:

  • 使用CSS_SELECTOR:

    driver.get('https://trupanion.com/members/contest?pixlee_album_photo_id=427049511')
    WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe#pixlee_lightbox_iframe")))
    WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "button.vote_button.mfp-voteText"))).send_keys("test")
    
  • 使用XPATH:

    driver.get("https://trupanion.com/members/contest?pixlee_album_photo_id=427049511")
    WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH,"//iframe[@id='pixlee_lightbox_iframe']")))
    WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//button[@class='vote_button mfp-voteText']"))).click()
    
  • 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
    
  • 浏览器快照:


参考

您可以在以下位置找到一些相关讨论:

  • Switch to an iframe through Selenium and python