Cannot locate element by Xpath for chrome download page - selenium

Question

I am trying to write code to check download is completed by selenium and chrome driver. My idea is
1.Go to download page("chrome://downloads/")
2.Check the url to ensure we have downloaded file from that site (locate http://xxxxxxxx)
3.Check download status( If I found "show in folder", it implies download success. if not, download failed)
I am stucking in step2, when I try to locate the url. I used developer tools, move cursor to the url to locate the element,and then I right click and copy the xpath. The xpath is like this
//*[#id="file-link"]
And then I try to click ctrl+F in developer tool and paste the xpath again. I cannot locate the element. Why? Checked there is no frame.

Answer 1

It shadow DOM and need to select /deep/ using CSS selector
downloads-manager/deep/downloads-item/deep/a[id="file-link"]

Answer 2

Another way of doing this could be writing a small Java utility for the same using File Class.
Something like this:
File f = new File("C:\\Users\\username\\Downloads\\Users_" + fielName+ ".xls");
Assert.assertTrue(f.exists());

Answer 3

This work for me on python:
from selenium import webdriver
from selenium.webdriver.support.wait import WebDriverWait
# disable file preview
options = webdriver.ChromeOptions()
options.add_experimental_option(
'prefs', {
'profile.default_content_settings.popups': 0,
'download.default_directory': '/some/download/dir',
'download.prompt_for_download': False,
'download.directory_upgrade': True,
'plugins.always_open_pdf_externally': True,
'plugins.plugins_disabled': 'Chrome PDF Viewer',
'disable-popup-blocking': True
}
)
driver = webdriver.Chrome(options=options)
# start load file
driver.get('url-to-file')
def condition_load_file(dr: webdriver.Chrome):
return dr.execute_script("""
try {
var el = document.querySelector("body > downloads-manager").shadowRoot.querySelector("#frb0").shadowRoot.querySelector("#show");
return el !== null;
} catch(exc) {
return false;
}
""")
# open new window and go to chrome://downloads/
driver.execute_script("window.open('');")
driver.switch_to.window(driver.window_handles[1])
driver.get('chrome://downloads/')
# waiting for download to finish
WebDriverWait(driver, 120).until(condition_load_file)