Unable to find element by id on chrome

Question

I am using python and selenium automation to toggle a switch on chrome://extensions/ . On the top of the website, there is an toggle for developer mode, and I am trying to use

driver.find_element_by_id("knob").click()

however, this doesnt find the element named ID. Does anyone know how I might select the element to toggle Developer mode?

@JohnGordon What do you mean By plain? It uses tags Ive never seen before, But I dont know any HTML. Could I use find by XPath? — Luke Vanzweden, Feb 04 '20 at 17:15
Are you sure the button's id is named knob? I am seeing the id as `devMode` on my end. — snnguyen, Feb 04 '20 at 17:18
@snnguyen I tried devMode, bar, and Knob, It cant find any Ids on that page — Luke Vanzweden, Feb 04 '20 at 17:19
hmm I am unable to query any element on `chrome://extensions/`. If you're trying to test an extension, it's easier to enable it via ChromeOptions — snnguyen, Feb 04 '20 at 17:51
@snnguyen I would, But I am trying to attach 100s of extensions, but chrome options only can add 20 at a time, a limit you cant get past. I have to add them 1 by 1, so i am trying to do it this way — Luke Vanzweden, Feb 05 '20 at 02:29

score 2 · Accepted Answer · answered Feb 05 '20 at 04:27

That element is inside ShadowDOM so you need to explicitly access it,
see Accessing Shadow DOM tree with Selenium.

A simpler solution seems to be to call the internal API directly:

driver.execute_script('''
  document.querySelector("extensions-manager")
    .delegate.setProfileInDevMode(true)
''')

Unable to find element by id on chrome

1 Answers1