通过Python3使用Selenium和WebDriver切换选项卡时，“NoSuchWindowException:没有这样的窗口：窗口已经关闭”

Question

我有一个表单，当我单击它时，它会在一个新选项卡中打开。当我尝试导航到那个新选项卡时，我总是得到一个NoSuchWindowException。代码非常简单“myframe”是新选项卡中的框架，信息最终将插入其中。我应该等点别的吗

from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait, Select
from selenium.webdriver.common.by import By
from selenium.common.exceptions import TimeoutException, NoSuchElementException
import time
import pandas as pd

url = *****
driver = webdriver.Chrome(executable_path = r'S:\Engineering\Jake\MasterControl Completing Pipette CalPM Forms\chromedriver')
driver.get(url)

wait = WebDriverWait(driver, 5)    

window_before = driver.window_handles[0]
driver.find_element_by_id('portal.scheduling.prepopulate').click()
window_after = driver.window_handles[1]
driver.switch_to_window(window_after)
driver.switch_to_default_content()
wait.until(EC.frame_to_be_available_and_switch_to_it('myframe'))

---

Traceback (most recent call last):

  File "<ipython-input-308-2aa72eeedd51>", line 1, in <module>
    runfile('S:/Engineering/Jake/MasterControl Completing Pipette CalPM Forms/Pipette Completing CalPM Tasks.py', wdir='S:/Engineering/Jake/MasterControl Completing Pipette CalPM Forms')

  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 678, in runfile
    execfile(filename, namespace)

  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 106, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "S:/Engineering/Jake/MasterControl Completing Pipette CalPM Forms/Pipette Completing CalPM Tasks.py", line 150, in <module>
    create_new_cal_task(asset_number)

  File "S:/Engineering/Jake/MasterControl Completing Pipette CalPM Forms/Pipette Completing CalPM Tasks.py", line 130, in create_new_cal_task
    driver.switch_to_default_content()

  File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 783, in switch_to_default_content
    self._switch_to.default_content()

  File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\switch_to.py", line 65, in default_content
    self._driver.execute(Command.SWITCH_TO_FRAME, {'id': None})

  File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute
    self.error_handler.check_response(response)

  File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)

NoSuchWindowException: no such window: window was already closed
  (Session info: chrome=68.0.3440.106)
  (Driver info: chromedriver=2.40.565498 (ea082db3280dd6843ebfb08a625e3eb905c4f5ab),platform=Windows NT 6.1.7601 SP1 x86_64)

Answer 1

根据您的问题和代码试用，当您打算导航到新选项卡时，您需要：

• 诱导WebDriverWait，同时切换到新选项卡
• 同样，当您打算switch()到所需的<iframe>时，您需要再次诱导WebDriverWait
• 当您switch()指向所需的<iframe>时，尝试使用所需^{的ID、NAME、XPATH或CSS-SELECTOR

• 经过这些简单修改后，您自己的代码如下所示：

  from selenium import webdriver
  from selenium.webdriver.support import expected_conditions as EC
  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  
  url = "your_url"
  driver = webdriver.Chrome(executable_path = r'S:\Engineering\Jake\MasterControl Completing Pipette CalPM Forms\chromedriver')
  driver.get(url)
  windows_before  = driver.current_window_handle
  driver.find_element_by_id('portal.scheduling.prepopulate').click()
  WebDriverWait(driver, 5).until(EC.number_of_windows_to_be(2))
  windows_after = driver.window_handles
  new_window = [x for x in windows_after if x != windows_before][0]
  # driver.switch_to_window(new_window) <! -deprecated>
  driver.switch_to.window(new_window)
  WebDriverWait(driver, 5).until(EC.frame_to_be_available_and_switch_to_it((By.ID,"myframe"))) # or By.NAME, By.XPATH, By.CSS_SELECTOR
  

Answer 2

请尝试更新您的chrome版本。同样的错误也发生在我身上，发生在Chrome70上，更新到91后，一切正常

Answer 3

感谢德班詹（并对迟来的回复表示歉意——刚刚回到办公室）。我可以通过使用

While True:
    try:
        [navigate to the new frame, wait for a specific element to show up]
        break
    except (NoSuchWindowException, NoSuchElementException):
        pass

我没有意识到，当我点击打开表单时，另一个窗口在后台短暂打开，然后关闭。这将窗口句柄增加到2，因此任何与等待2个窗口句柄相关的操作都会抛出错误