为什么在python中尝试使用Selenium访问元素的文本时会出现过时的元素异常？[重复]

Question

我试图使用Selenium在下拉菜单中读取元素的文本，但是当我使用“element.text”时，我得到了一个陈旧的元素异常。这是我的代码：

    list_options = driver.find_elements_by_class_name("select2 results__option")
    for l in list_options:
        if l.text == "DOI":
            l.click()

这是我一直收到的错误消息：

if l.text == "DOI":
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-    packages/selenium/webdriver/remote/webelement.py", line 76, in text
return self._execute(Command.GET_ELEMENT_TEXT)['value']
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/selenium/webdriver/remote/webelement.py", line 633, in _execute
return self._parent.execute(command, params)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
self.error_handler.check_response(response)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document
(Session info: chrome=75.0.3770.80)
(Driver info: chromedriver=74.0.3729.6 
(255758eccf3d244491b8a1317aa76e1ce10d57e9-refs/branch-heads/3729@{#29}),platform=Mac OS X 10.14.1 x86_64)

任何帮助都将不胜感激，因为我是硒的新手。谢谢！

Answer 1

当您单击该项时，页面将被刷新，并且您引用的元素（存储在变量中）已过时。页面刷新以这样一种方式更改内容，即您存储的确切元素不再在页面上。为了克服这个问题，需要在for循环中重新分配下拉列表。

试试下面的代码。

list_options = driver.find_elements_by_css_selector('.select2.results__option')
for l in range(len(list_options)):
  new_list_options = driver.find_elements_by_css_selector('.select2.results__option')
  if new_list_options[l].text == "DOI":
      new_list_options[l].click()