Get chromedriver current downloads progress(es) with python using selenium

get_chromedriver_download_progress.md

Notice:

* This method is tested on Chrome Version 61.0.3163.100, chromedriver Version 2.33.506106

Getting the progress of the first downloads-item

So for some reason, chrome keeps download items in the shadow-root of tag .

This makes me so confused when I am trying to automate chrome to download files.

After some research, i find out that you can access the elements inside shadow-root in javascript with property .shadowRoot of the DOM element which the ShadowRoot is attached.

And this is the code:

from selenium import webdriver

def get_download_progress():
    progress = driver.execute_script('''
    
    var tag = document.querySelector('downloads-manager').shadowRoot;
    var intag = tag.querySelector('downloads-item').shadowRoot;
    var progress_tag = intag.getElementById('progress');
    var progress = null;
    if(progress_tag) {
        progress = progress_tag.value;
    }
    return progress;
    
    ''')
    return progress

driver = webdriver.Chrome()

# do some staff

driver.get('chrome://downloads/')

progress = get_download_progress()

print("Progress: ", progress)

Getting progresses of all downloads-items

Using method querySelector() you get the first element that matches, that is, you get the first download-item in the downloads list.

To get all download-items, you can use method querySelectorAll():

def get_download_progress_all():
    progress = driver.execute_script('''
    
    var tag = document.querySelector('downloads-manager').shadowRoot;
    var item_tags = tag.querySelectorAll('downloads-item');
    var item_tags_length = item_tags.length;
    var progress_lst = [];
    for(var i=0; i<item_tags_length; i++) {
        var intag = item_tags[i].shadowRoot;
        var progress_tag = intag.getElementById('progress');
        var progress = null;
        if(progress_tag) {
            var progress = progress_tag.value;
        }
        progress_lst.push(progress);
    }
    return progress_lst
    
    ''')
    return progress

progress = get_download_progress_all()

print("Progress: ", progress)

There you have it!

shanodRoot is null, why?

shanodRoot is null, why?

No one replied to you yet?!

Works for me. Are you running the whole thing or just the function?

shanodRoot is null, why?

No one replied to you yet?!

Ah! The shadowRoot shouldn't be null.

But if the download item thingy isn't from the current session, and it won't have a progress bar, then my method will fail. I think I should add a checking to fix that.

But if the download item thingy isn't from the current session, and it won't have a progress bar, then my method will fail. I think I should add a checking to fix that.

Did you find a fix? Also, what are the values that get returned? Booleans or ints/strings between 0 and 100?

Edit: I just used a try/except block. Turn out I got this error because the download finished too fast.

not working :( in chrome 80 :(