Python Selenium StaleElementReferenceException

Question

我已经在其他帖子上看到了解决这个问题的方法(主要是建议更长的等待时间)，但我尝试过，但没有成功。

下面是我得到的错误：

Traceback (most recent call last):
  File "LobbyistsPrep.py", line 126, in <module>
    the_download = get_file(year, report, download_dir)
  File "LobbyistsPrep.py", line 28, in get_file
    Year.select_by_visible_text(year_text)
  File "C:\Python27\lib\site-packages\selenium\webdriver\support\select.py", lin
e 120, in select_by_visible_text
    self._setSelected(opt)
  File "C:\Python27\lib\site-packages\selenium\webdriver\support\select.py", lin
e 212, in _setSelected
    option.click()
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webelement.py",
line 80, in click
    self._execute(Command.CLICK_ELEMENT)
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webelement.py",
line 501, in _execute
    return self._parent.execute(command, params)
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", l
ine 308, in execute
    self.error_handler.check_response(response)
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py"
, line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: stale elemen
t reference: element is not attached to the page document
  (Session info: chrome=65.0.3325.181)
  (Driver info: chromedriver=2.33.506120 (e3e53437346286c0bc2d2dc9aa4915ba81d902
3f),platform=Windows NT 6.1.7601 SP1 x86_64)

相关代码如下：

def get_file(year_text, category, download_dir):
    # Store a list of files in the Downloads directory.
    # We will use this later to determine the filename of the the CSV we downloaded.
    downloads_before = os.listdir( download_dir )

    # Change the Year dropdown
    Year = Select(driver.find_element_by_name('ctl00$ctl00$ContentPlaceHolder$ContentPlaceHolder1$ddYear'))
    Year.select_by_visible_text(year_text)
    time.sleep(30)

    # Change the Expenditure Type dropdown
    Type = Select(driver.find_element_by_name('ctl00$ctl00$ContentPlaceHolder$ContentPlaceHolder1$ddExpType'))
    Type.select_by_visible_text(category)
    time.sleep(30)

    # Change the Report Month dropdown
    Month = Select(driver.find_element_by_name('ctl00$ctl00$ContentPlaceHolder$ContentPlaceHolder1$ddMonth'))
    Month.select_by_visible_text('-- All Available --')
    time.sleep(30)

    # Click the Export to CSV button (downloads the CSV file)
    driver.find_element_by_name('ctl00$ctl00$ContentPlaceHolder$ContentPlaceHolder1$btnExport').click()
    time.sleep(30)

    # Now that we have downloaded the file, lets check the Downloads directory again and compare.
    downloads_after = os.listdir( download_dir )
    downloads_change = set(downloads_after) - set(downloads_before)
    # If there is only one difference, then that file is the one we downloaded.
    if len(downloads_change) == 1:
        file_name = downloads_change.pop()
        file_path = download_dir + file_name
        return file_path
    # Otherwise, something went wrong: Either the number of files changed by MORE than one, or NOTHING was downloaded.
    else:
        return False

driver.get('http://mec.mo.gov/mec/Lobbying/Lob_ExpCSV.aspx')
time.sleep(30)

for report in reports_wanted:
    for year in years_wanted:
        the_download = get_file(year, report, download_dir)
        if the_download:
            if report == 'Group':
                print 'Downloaded ' + the_download + '. Adding to GROUP.  Report:\t' + year + '\t' + report
                group_files.append(the_download)
            else:
                print 'Downloaded ' + the_download + '. Adding to INDIV.  Report:\t' + year + '\t' + report
                files.append(the_download)
        else:
            print 'PROBLEM DOWNLOADING: \t' + year + '\t' + report

我们的time.sleep曾经是time.sleep(2) --我试着把它改成30，但也没有用。

我还是个清除窃听器的新手，而且这个不是我造的，所以请温柔点。提前谢谢。

Answer 1

将已修复问题的评论转化为对他人的回答。

最终解决了上述问题的是，将Chromedriver至少更新为2.36，因为它们运行在Chrome build 65上，而当前版本的Chromedriver 2.33：https://sites.google.com/a/chromium.org/chromedriver/downloads不支持该版本

通过保持这些更新，或者在推荐的pair上，您将遇到更少的问题，如chromedriver下载登录页面中所述。

如果您正在寻求有关StaleElementReferenceException的帮助

这是来自wiki的定义

当对元素的引用现在是“陈旧的”时抛出

。

陈旧表示元素不再出现在页面的DOM上。

StaleElementReferenceException的可能原因包括但不限于：

您不再处于同一页上，或者该页可能在定位该元素后已刷新。

该元素可能已被删除并重新添加到屏幕，因为它已被定位。例如被重新定位的元素。当更新值并重建节点时，这通常会发生在javascript框架中。

元素可能位于已刷新的iframe或另一个上下文中。

请参考以下内容：

在那个问题上

• Selenium HQ page
• Wiki
• Some真的很好

Answer 2

我只有一个java的解决方案，但它是有效的。

如果抛出异常，我会捕获它并重试：

boolean isElementFound = false;

while(!isElementFound){

  try{

     WebElement myElement = Driver.findElement(By.id("elementID"));
     isElementFound = true;   

  }catch(StaleElementReferenceException e){
    //nothing!
  } 
}