如何在 Selenium 的下拉列表中选择项目

Question

首先，我一直在尝试从这个网页获取下拉列表：http : //solutions.3m.com/wps/portal/3M/en_US/Interconnect/Home/Products/ProductCatalog/Catalog/?PC_Z7_RJH9U5230O73D0ISNF9B3C3SI1000000_nid7WiJFRF7FPCX8F9100000000

这是我的代码：

    import urllib2
    from bs4 import BeautifulSoup
    import re
    from pprint import pprint

    from selenium import webdriver

    url = 'http://solutions.3m.com/wps/portal/3M/en_US/Interconnect/Home/Products/ProductCatalog/Catalog/?PC_Z7_RJH9U5230O73D0ISNF9B3C3SI1000000_nid=RFCNF5FK7WitWK7G49LP38glNZJXPCDXLDbl'

    element_xpath = '//*[@id="Component1"]'
    driver = webdriver.PhantomJS()
    driver.get(url)
    element = driver.find_element_by_xpath(element_xpath)
    element_xpath = '/option[@value="02"]'
    all_options = element.find_elements_by_tag_name("option")
    for option in all_options:
        print("Value is: %s" % option.get_attribute("value"))
        option.click()
    source = driver.page_source.encode('utf-8', 'ignore')
    driver.quit()

    source = str(source)

    soup = BeautifulSoup(source, 'html.parser')

    print soup

打印出来的是这样的：

Traceback (most recent call last):
  File "../../../../test.py", line 58, in <module>
Value is: XX
    main()
  File "../../../../test.py", line 46, in main
    option.click()
  File "/home/eric/dev/octocrawler-env/local/lib/python2.7/site-packages/selenium-2.33.0-py2.7.egg/selenium/webdriver/remote/webelement.py", line 54, in click
    self._execute(Command.CLICK_ELEMENT)
  File "/home/eric/dev/octocrawler-env/local/lib/python2.7/site-packages/selenium-2.33.0-py2.7.egg/selenium/webdriver/remote/webelement.py", line 228, in _execute
    return self._parent.execute(command, params)
  File "/home/eric/dev/octocrawler-env/local/lib/python2.7/site-packages/selenium-2.33.0-py2.7.egg/selenium/webdriver/remote/webdriver.py", line 165, in execute
    self.error_handler.check_response(response)
  File "/home/eric/dev/octocrawler-env/local/lib/python2.7/site-packages/selenium-2.33.0-py2.7.egg/selenium/webdriver/remote/errorhandler.py", line 158, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.ElementNotVisibleException: Message: u'{"errorMessage":"Element is not currently visible and may not be manipulated","request":{"headers":{"Accept":"application/json","Accept-Encoding":"identity","Connection":"close","Content-Length":"81","Content-Type":"application/json;charset=UTF-8","Host":"127.0.0.1:51413","User-Agent":"Python-urllib/2.7"},"httpVersion":"1.1","method":"POST","post":"{\\"sessionId\\": \\"30e4fd50-f0e4-11e3-8685-6983e831d856\\", \\"id\\": \\":wdc:1402434863875\\"}","url":"/click","urlParsed":{"anchor":"","query":"","file":"click","directory":"/","path":"/click","relative":"/click","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/click","queryKey":{},"chunks":["click"]},"urlOriginal":"/session/30e4fd50-f0e4-11e3-8685-6983e831d856/element/%3Awdc%3A1402434863875/click"}}' ; Screenshot: available via screen

最奇怪最令人气愤的是，有时它实际上一切正常。我不知道这里发生了什么。

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更新

似乎我对其他网站上的下拉表单的可见性没有问题，只有这个。有什么东西可能会使表单不可见（如果是，为什么只有 95% 的时间）？加载页面可能会导致内容不可见的问题吗？

Answer 1

下面是在 Python3 中使用 Selenium Webdriver 的方法：

    all_options = self.driver.find_element_by_id("Component1")
    options = all_options.find_elements_by_tag_name("option")
    for each_option in all_options:
        print(each_option.get_attribute("value"))

如果您尝试从文本框中选择某些内容，请执行以下操作：

    select = Select(self.driver.find_element_by_id("Component1"))
    select.select_by_visible_text("02")

参考资料：http : //selenium-python.readthedocs.org/api.html