Selenium webdriver 在 chrome://downloads 找不到元素

Selenium webdriver can#39;t find elements at chrome://downloads(Selenium webdriver 在 chrome://downloads 找不到元素)

问题描述

我在 python 中使用 selenium 和 chromedriver.

I use selenium with the chromedriver in python.

我的问题是当我尝试访问 chrome 下载页面 (chrome://downloads) 上的元素时，selenium 给了我一个错误.例如，我尝试获取文件 url "http://file.jpg".

My problem is that selenium gives me an error as i try to access elements on the chrome download page (chrome://downloads). For example i try to get the file url "http://file.jpg".

<a id="url" target="_blank" href="http://file.jpg">http://file.jpg</a>

但是当我尝试通过它的 id 获取元素时，我得到了一个异常.

But as i try to get the element by its id I get an exception.

代码:

driver = webdriver.Chrome("chromedriver.exe")
driver.get("chrome://downloads/")
file_url = driver.find_element_by_id("url").get_attribute("href")

例外:

Traceback (most recent call last):
  File "<pyshell#34>", line 3, in <module>
    driver.find_element_by_id("url")
  File "D:Pythonlibsite-packagesseleniumwebdriver
emotewebdriver.py", line 269, in find_element_by_id
    return self.find_element(by=By.ID, value=id_)
  File "D:Pythonlibsite-packagesseleniumwebdriver
emotewebdriver.py", line 752, in find_element
    'value': value})['value']
  File "D:Pythonlibsite-packagesseleniumwebdriver
emotewebdriver.py", line 236, in execute
    self.error_handler.check_response(response)
  File "D:Pythonlibsite-packagesseleniumwebdriver
emoteerrorhandler.py", line 192, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"id","selector":"url"}
  (Session info: chrome=56.0.2924.87)
  (Driver info: chromedriver=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9),platform=Windows NT 10.0.10586 x86_64)

通过 driver.execute_script() 使用 javascript 对我也不起作用.当我在浏览器中看到元素时，为什么会收到 NoSuchElementException?

Using javascript via driver.execute_script() didn't work for me either. Why am i getting a NoSuchElementException when i can see the element in the browser?

推荐答案

位于多个 shadow-root 块内的目标链接.试试这个:

Target link located inside several shadow-root blocks. Try this:

driver = webdriver.Chrome("chromedriver.exe")
driver.get("chrome://downloads/")

manager = driver.find_element_by_css_selector('body/deep/downloads-manager')
item = manager.find_element_by_css_selector('body/deep/downloads-item')
shadow = driver.execute_script('return arguments[0].shadowRoot;', item)
link = shadow.find_element_by_css_selector('div#title-area>a')

file_url = link.get_attribute("href")

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