ic0n/get_chromedriver_download_progress.md

## get_chromedriver_download_progress.md

      
    Raw
  

              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!