python selenium selenium.common.exceptions.StaleElementReferenceException 错误答案

【问题标题】：python selenium selenium.common.exceptions.StaleElementReferenceException errorpython selenium selenium.common.exceptions.StaleElementReferenceException 错误
【发布时间】：2016-03-21 08:47:31
【问题描述】：

我有下面的代码

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait

driver = webdriver.Firefox()

driver.get("https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa")
username = WebDriverWait(driver, 20).until(lambda driver : driver.find_element_by_id('appleId'))
password = WebDriverWait(driver, 20).until(lambda driver : driver.find_element_by_id('pwd'))

username.send_keys("xxxxxxxxxx.com")
password.send_keys("xxxxxxxx")

password.submit()

但我得到了以下错误

password.submit()
File "/Users/.virtualenvs/itunes/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py", line 84, in submit
    self._execute(Command.SUBMIT_ELEMENT)
  File "/Users/.virtualenvs/itunes/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py", line 457, in _execute
    return self._parent.execute(command, params)
  File "/Users/.virtualenvs/itunes/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 233, in execute
    self.error_handler.check_response(response)
  File "/Users/.virtualenvs/itunes/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: Element not found in the cache - perhaps the page has changed since it was looked up
Stacktrace:
    at fxdriver.cache.getElementAt (resource://fxdriver/modules/web-element-cache.js:9454)
    at Utils.getElementAt (file:///var/folders/x1/1bwt313j0qvgdh5pfzpbpvcw0000gn/T/tmpR5A61x/extensions/fxdriver@googlecode.com/components/command-processor.js:9039)
    at WebElement.submitElement (file:///var/folders/x1/1bwt313j0qvgdh5pfzpbpvcw0000gn/T/tmpR5A61x/extensions/fxdriver@googlecode.com/components/command-processor.js:12156)
    at DelayedCommand.prototype.executeInternal_/h (file:///var/folders/x1/1bwt313j0qvgdh5pfzpbpvcw0000gn/T/tmpR5A61x/extensions/fxdriver@googlecode.com/components/command-processor.js:12661)
    at fxdriver.Timer.prototype.setTimeout/<.notify (file:///var/folders/x1/1bwt313j0qvgdh5pfzpbpvcw0000gn/T/tmpR5A61x/extensions/fxdriver@googlecode.com/components/command-processor.js:625)

有什么想法吗？

【问题讨论】：

标签： python selenium selenium-firefoxdriver

【解决方案1】：

当您在密码字段中输入内容时，DOM 会被渲染。你需要重新定位它

password = WebDriverWait(driver, 20).until(lambda driver : driver.find_element_by_class_name('dots')) # class dots is added in the rendering
password.submit()

【讨论】：

【解决方案2】：

有时，当您对元素执行任何操作时，它的某些属性（例如类、值等）会发生变化，您无法进一步访问它。

解决这个问题的最简单方法是再次识别该元素并使用它，例如：

pass = WebDriverWait(driver, 20).until(lambda driver : driver.find_element_by_id('pwd'))
pass.submit();

示例：检查密码字段时，转到 apple.com 登录页面。当您单击该字段时，您会发现它的类从 password 更改为 password focused，当您在其上键入时，它的类更改为 password focused edited。

【讨论】：