如何在无头浏览器中关闭模态对话框？

Question

我正在用selenium2、python和亚马逊的ec2（Ubuntu 11.04）来做我的项目。

因为在亚马逊的ec2上没有显示器，所以我使用了PyVirtualDisplay，这样可以在没有显示器的情况下运行程序。

当我运行我的项目时，出现了一个异常

Traceback (most recent call last):
   File "spyfu_ad_crawler_server.py", line 68, in <module>
     main(i[0])
   File "spyfu_ad_crawler_server.py", line 34, in main
     WebDriverWait(browser, 10).until(lambda driver :    driver.find_element_by_xpath("/html/body/form/div[3]/div[3]/div/div/table/tbody/tr[3]/td/tab le/tbody/tr[2]/td/table/tbody"))
   File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/support/wait.py", line 49, in until
      value = method(self._driver)
    File "spyfu_ad_crawler_server.py", line 34, in <lambda>
      WebDriverWait(browser, 10).until(lambda driver : driver.find_element_by_xpath("/html/body/form/div[3]/div[3]/div/div/table/tbody/tr[3]/td/table/tbody/tr[2]/td/table/tbody"))
    File "/usr/local/lib/python2.7/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/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 645, in find_element
       {'using': by, 'value': value})['value']
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 153, in execute
      self.error_handler.check_response(response)
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 147, in check_response
      raise exception_class(message, screen, stacktrace)
        WebDriverException: Message: u'Modal dialog present' 


Traceback (most recent call last):
     File "spyfu_ad_crawler_server.py", line 75, in <module>
       browser.get(base_url)
     File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 165, in get
        self.execute(Command.GET, {'url': url})
     File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 153, in execute
         self.error_handler.check_response(response)
     File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 147, in check_response
         raise exception_class(message, screen, stacktrace)
    selenium.common.exceptions.WebDriverException: Message: u'Modal dialog present' 

这个问题应该怎么解决呢？

在selenium中，如何用python处理这样的对话框呢？

Answer 1

请在执行 driver.get() 之前和之后运行以下代码：

 driver.execute_script('window.onbeforeunload = function() {}')

这样应该就能正常工作。我没有确认过，但Firefox的网站上应该有关于这个事件的更多信息。

简单来说，你是在重置网页中的处理程序，这个处理程序负责显示那个弹出对话框。所以你就看不到它了。这种方法基本上解决了我的问题。