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I'm using Python2.7 and Selenium and am trying to use a select box's option list for the basis of my site spider functionality, lets get right to the code:

 select = self.br.find_element_by_name( field )  #get the select element            
 options = select.find_elements_by_tag_name("option") #get all the options into a list

 for option in options: #iterate over the options
     print "starting loop on option %s" % option.text

     #now get the option with the value that is currently being iterated over and select it from the original select box source
     self.br.find_element_by_xpath("//select[@name='%s']/option[@value='%s']" % ( field, option.get_attribute("value") ) ).click() #the click takes you to a new page

     source = self.br.page_source #get the new page source

     #now check to see if some required data is on the navigated page, and print some stuff if so
     if "There is no summary data available." not in source:
          print "the new page is good! Here are the original args: ", option.text, option.get_attribute("value") 
     #time to go back to the main page and click the next option element
     self.br.back()
     print "went backwards" #for debugging

So, everything works until the second iteration after the self.br.back() and the loop starts again. I get an extremely long Selenium error stating:

 selenium.common.exceptions.StaleElementReferenceException: Message: u'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:7643)
at Utils.getElementAt (file:///tmp/tmpm_ciQJ/extensions/fxdriver@googlecode.com/components/command_processor.js:7232)
at WebElement.getElementAttribute (file:///tmp/tmpm_ciQJ/extensions/fxdriver@googlecode.com/components/command_processor.js:10335)
at DelayedCommand.prototype.executeInternal_/h (file:///tmp/tmpm_ciQJ/extensions/fxdriver@googlecode.com/components/command_processor.js:10840)
at DelayedCommand.prototype.executeInternal_ (file:///tmp/tmpm_ciQJ/extensions/fxdriver@googlecode.com/components/command_processor.js:10845)
at DelayedCommand.prototype.execute/< (file:///tmp/tmpm_ciQJ/extensions/fxdriver@googlecode.com/components/command_processor.js:10787)

Clearly the error says the element may no longer exist, but how would that be possible since I'm just iterating over a list of objects that was retrieved during a previous page session...

In any case, how should I go about doing this? Maybe the way I'm trying isn't the best way...

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1 回答 1

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我对python并不完全熟悉，所以你可能需要稍微修改一下。我认为这至少会让你开始。

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

select = self.br.find_element_by_name( field )  #get the select element            
options = select.find_elements_by_tag_name("option") #get all the options into a list

optionsList = []

for option in options: #iterate over the options, place attribute value in list
    optionsList.append(option.get_attribute("value"))

for optionValue in optionsList:
    print "starting loop on option %s" % optionValue

    select = Select(self.br.find_element_by_name( field ))
    select.select_by_value(optionValue)

    source = self.br.page_source #get the new page source

    #now check to see if some required data is on the navigated page, and print some stuff if so
    if "There is no summary data available." not in source:
         print "the new page is good! Here are the original args: ", optionValue
    #time to go back to the main page and click the next option element
    self.br.back()
    print "went backwards" #for debugging

这里的想法是在第一个 for 循环中构建选项值列表，然后遍历这些选项值以导航到第二个 for 循环中的第二页。使用 python Select 库来选择这些选项值。每次通过第二个 for 循环时，我都会输入一行以获取对下拉列表的新引用。

我希望这可以帮到你

于 2013-09-18T15:12:31.173 回答