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我必须在我的项目中使用硒。当我在使用硒时。我在每一步都像这样

   time.sleep(6)

我为加载特定页面提供了足够的时间间隔，但在某些时候我仍然面临以下错误。大多数情况下，我得到了这样的例外

常规例外：

   Exception: Message: u'Unable to locate element:   {"method":"xpath","selector":"//textarea[@style=\\"overflow-y: hidden; height: 50px; width:  300px;\\"]"}' ; Stacktrace: Method WebDriverError threw an error in    file:///tmp/tmpBxGp2P/extensions/fxdriver@googlecode.com/resource/modules/atoms.js 
   Traceback (most recent call last):
    File "crawl_optimize.py", line 206, in main
     word_query = browser.find_element_by_xpath('//textarea[@style="overflow-y: hidden; height: 50px; width: 300px;"]')
    File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 210, in find_element_by_xpath
     return self.find_element(by=By.XPATH, value=xpath)
    File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 643, in find_element
    {'using': by, 'value': value})['value']
   File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 153, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/errorhandler.py", l     ine 147, in check_response
     raise exception_class(message, screen, stacktrace)

由于 WebDriverWait().Until()，我也没有收到这样的实现错误：

    NoSuchElementException: Message: u'Unable to locate element: {  "method":"xpath","selector":"//textarea[@style=\\"overflow-y: hidden; height: 50px; width: 300px;\\"]"}' ; Stacktrace: Method WebDriverError threw an error in   file:///tmp/tmpBxGp2P/extensions/fxdriver@googlecode.com/resource/modules/atoms.js 
  keyword : balance transfer ad pos : 2
  Exception: Message: None 
  Traceback (most recent call last):
    File "crawl_optimize.py", line 228, in main
     start_cpc,end_cpc = set_initial_cpc(initial_max_cpc,ad_position)
    File "crawl_optimize.py", line 95, in set_initial_cpc
    ep = crawl_position(cost)
   File "crawl_optimize.py", line 82, in crawl_position
    WebDriverWait(browser, 10).until(lambda driver :   driver.find_element_by_link_text(word.lower()))
   File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/support/wait.py", line 55, in until
    raise TimeoutException()
    TimeoutException: Message: None

摆脱这种异常的方法是什么？

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1 回答 1

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可能是2件事。

  1. 您的元素尚未在分配的 6 秒内完成加载

  2. 您的定位器格式不正确。这看起来很可疑...

    { "method":"xpath","selector":"//textarea[@style=\"overflow-y: hidden; 高度：50px；宽度：300px;\"]"}'

您能否使用 FireFinder 或类似工具检查定位器是否返回您期望的结果？

如果定位器没问题，您可以尝试使用 WebDriverWait & ExpectedCondition 来确认页面已完成加载，而不是赌您的页面将始终在 6 秒内加载

于 2012-02-03T06:36:12.050 回答