为什么Selenium不会切换到给定的框架？

Question

我有以下硒的Python脚本（python3全工作示例）：

# -*- coding: utf-8 -*- 
from selenium import webdriver 
from selenium.webdriver.common.by import By 
from selenium.webdriver.common.keys import Keys 
from selenium.webdriver.support.ui import Select 
from selenium.common.exceptions import NoSuchElementException 
from selenium.common.exceptions import NoAlertPresentException 
import unittest, time, re 

class Test1(unittest.TestCase): 
    def setUp(self): 
     self.driver = webdriver.Firefox() 
     self.driver.implicitly_wait(30) 
     self.base_url = "http://ironspider.ca/" 
     self.verificationErrors = [] 
     self.accept_next_alert = True 

    def test_1(self): 
     driver = self.driver 
     driver.get(self.base_url + "/frames/frames_example1/advanced.htm") 
     driver.switch_to.frame("content") 
     self.assertEqual("The Eve of the War", driver.find_element_by_css_selector("h2").text) 
     driver.switch_to.frame("menu") 
     driver.find_element_by_link_text("Chapter 2").click() 
     driver.switch_to.frame("content") 
     self.assertEqual("The Falling Star", driver.find_element_by_css_selector("h2").text) 

    def is_element_present(self, how, what): 
     try: self.driver.find_element(by=how, value=what) 
     except NoSuchElementException: return False 
     return True 

    def is_alert_present(self): 
     try: self.driver.switch_to_alert() 
     except NoAlertPresentException: return False 
     return True 

    def close_alert_and_get_its_text(self): 
     try: 
      alert = self.driver.switch_to_alert() 
      alert_text = alert.text 
      if self.accept_next_alert: 
       alert.accept() 
      else: 
       alert.dismiss() 
      return alert_text 
     finally: self.accept_next_alert = True 

    def tearDown(self): 
     self.driver.quit() 
     self.assertEqual([], self.verificationErrors) 

if __name__ == "__main__": 
    unittest.main() 

一旦运行该脚本，我收到以下错误：

====================================================================== 
ERROR: test_1 (__main__.Test1) 
---------------------------------------------------------------------- 
Traceback (most recent call last): 
    File "E:/Privat/Learn/Selenium/test2.py", line 23, in test_1 
    driver.switch_to.frame("menu") 
    File "C:\Program Files (x86)\Python 3.5\lib\site-packages\selenium\webdriver\remote\switch_to.py", line 67, in frame 
    self._driver.execute(Command.SWITCH_TO_FRAME, {'id': frame_reference}) 
    File "C:\Program Files (x86)\Python 3.5\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 201, in execute 
    self.error_handler.check_response(response) 
    File "C:\Program Files (x86)\Python 3.5\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 181, in check_response 
    raise exception_class(message, screen, stacktrace) 
selenium.common.exceptions.NoSuchFrameException: Message: Unable to locate frame: menu 
Stacktrace: 
    at FirefoxDriver.prototype.switchToFrame (file:///C:/Users/dial1/AppData/Local/Temp/tmpyz7v7fdj/extensions/fxdriver@googlecode.com/components/driver-component.js:10729) 
    at DelayedCommand.prototype.executeInternal_/h (file:///C:/Users/dial1/AppData/Local/Temp/tmpyz7v7fdj/extensions/fxdriver@googlecode.com/components/command-processor.js:12534) 
    at fxdriver.Timer.prototype.setTimeout/<.notify (file:///C:/Users/dial1/AppData/Local/Temp/tmpyz7v7fdj/extensions/fxdriver@googlecode.com/components/command-processor.js:621) 

---------------------------------------------------------------------- 
Ran 1 test in 34.349s 

FAILED (errors=1) 

然而，问题网页是否包含一个名为'menu'的框架，那为什么Selenium失败呢？我怎样才能解决这个问题？

Answer 1

必须切换回“默认”窗口，请参阅固定代码。但是，这似乎没有记录...

# -*- coding: utf-8 -*- 
from selenium import webdriver 
from selenium.webdriver.common.by import By 
from selenium.webdriver.common.keys import Keys 
from selenium.webdriver.support.ui import Select 
from selenium.common.exceptions import NoSuchElementException 
from selenium.common.exceptions import NoAlertPresentException 
import unittest, time, re 

class Test1(unittest.TestCase): 
    def setUp(self): 
     self.driver = webdriver.Firefox() 
     self.driver.implicitly_wait(30) 
     self.base_url = "http://ironspider.ca/" 
     self.verificationErrors = [] 
     self.accept_next_alert = True 

    def test_1(self): 
     driver = self.driver 
     driver.get(self.base_url + "/frames/frames_example1/advanced.htm") 
     driver.switch_to.frame("content") 
     self.assertEqual("The Eve of the War", driver.find_element_by_css_selector("h2").text) 
     driver.switch_to.default_content() 
     driver.switch_to.frame("menu") 
     driver.find_element_by_link_text("Chapter 2").click() 
     driver.switch_to.default_content() 
     driver.switch_to.frame("content") 
     self.assertEqual("The Falling Star", driver.find_element_by_css_selector("h2").text) 

    def is_element_present(self, how, what): 
     try: self.driver.find_element(by=how, value=what) 
     except NoSuchElementException: return False 
     return True 

    def is_alert_present(self): 
     try: self.driver.switch_to_alert() 
     except NoAlertPresentException: return False 
     return True 

    def close_alert_and_get_its_text(self): 
     try: 
      alert = self.driver.switch_to_alert() 
      alert_text = alert.text 
      if self.accept_next_alert: 
       alert.accept() 
      else: 
       alert.dismiss() 
      return alert_text 
     finally: self.accept_next_alert = True 

    def tearDown(self): 
     self.driver.quit() 
     self.assertEqual([], self.verificationErrors) 

if __name__ == "__main__": 
    unittest.main()