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I'm using Selenium Browser for day to day browsing, and I'd like to fire some code when I press some keys on any page. At first I thought I can just load javascript on every page that registers keys/mouse input, but I'd actually really prefer to have some python list available with past keys/mouse clicks, e.g. my key example in javascript:

var myhistory = []

document.addEventListener("keydown", keyDownTextField, false);

function keyDownTextField(e) {
var keyCode = e.keyCode;
  myhistory.push(keyCode)
}

Is there any way to do this in pure Python/Selenium?

I'm using Selenium Browser for day to day browsing, and I'd like to fire some code when I press some keys on any page. At first I thought I can just load javascript on every page that registers keys/mouse input, but I'd actually really prefer to have some python list available with past keys/mouse clicks, e.g. my key example in javascript:

var myhistory = []

document.addEventListener("keydown", keyDownTextField, false);

function keyDownTextField(e) {
var keyCode = e.keyCode;
  myhistory.push(keyCode)
}

Is there any way to do this in pure Python/Selenium?

  • javascript
  • python
  • selenium
Share Improve this question asked Mar 5, 2015 at 22:53 PascalVKootenPascalVKooten 21.5k18 gold badges113 silver badges167 bronze badges 6
  • Do I understand your question right: You sit in front of your puter and use your keyboard and selenium controls the browser on the screen and you would like to know which keys you pressed in the browser window, only using Python, no javascript code? – User Commented Mar 6, 2015 at 1:14
  • @User Actually, javascript is allowed. The main point is that my python session should be able to receive information. – PascalVKooten Commented Apr 11, 2015 at 19:24
  • Is there any solution for this? – Revaapriyan Commented Feb 21, 2019 at 18:36
  • @PascalVKooten Let me know if this worked for you – AturSams Commented Jan 26, 2021 at 11:00
  • @Revaapriyan I added a new answer – AturSams Commented Jan 26, 2021 at 11:00
 |  Show 1 more ment

3 Answers 3

Reset to default 3

What I would try:

  1. Execute a javascript that registers at the document body 

    <body onkeyup="my_javasctipt_keyup()" and onkeydown="my_javasctipt_keydown()">

    using browser.execute_script. (partially solved, see question)

  2. Save the key up and keydown events in a variable in javascript. (solved, see question)

  3. use browser.execute_script to return the variables.

What I am uncertain about:

  • The return value of browser.execute_script may return json serializable objects or strings only
  • keyup and keydown in body may not work if they are used in child elements that define their own event listeners

Hopefully this is of help. If any code results form this I would be interested in knowing.

This code is what I feel should work:

from selenium import webdriver
browser = webdriver.Firefox()
browser.execute_script("""var myhistory = []

document.addEventListener("keydown", keyDownTextField, false);

function keyDownTextField(e) {
var keyCode = e.keyCode;
  myhistory.push(keyCode)
}""")
def get_history():
    return browser.execute_script("myhistory")

# now wait for a while and type on the browser
import time; time.sleep(5000)

print("keys:", get_history())

The point is that the code of selenium can never run at the same time as the browser handles keyboard input. As such, events need to be handled in javascript, the result saved, e.g. in an array and then, when selenium is asked, the array is returned to Python.

boppreh/keyboard would let you do that.
You install it. pip install keyboard
You import it. import keyboard
You use it. keyboard.add_hotkey('left', print, args=['You pressed the left arrow key'])
Then you disable it. keyboard.remove_all_hotkeys()

Well, in that case you had to choose the right tool for the job, i advice puppeteer a web-automation family instrument a pure-made JS, which can easily interact with the browser ( from js to js ) and catch events directly from the other side without any mediation.

Yet with selenium you can still achieve this transitively without messing too much with the pages's code or overcharging it with unnecessary tasks, also reloading the page content resets all its variables, which means it's lossy approach. The best closest way is to set an eventhandler internally and directly catch it from outside using Runtime.evaluate instead because it doesn't affect the page content and specifically it sticks to the function until it yields something using promise calls, it's better away than probing around some global variable over and over which is seen a bad practise see here.

myhistory = []
evt_handler = """
new Promise((rs,rj) => window.onkeydown= e => rs(e.keyCode) )
"""
def waitforclick():
    try:
        myhistory.append(browser.execute_cdp_cmd('Runtime.evaluate', {'expression': evt_handler, 'awaitPromise': True,'returnByValue': True})['result']['value'])
    except:
        waitforclick()

To avoid locking out the cpu you need to fork a thread in parallel.

from threading import Timer 
t = Timer(0.0, waitforclick)

then t.start() instead of waitforclick().

Also you can use timeout if you want to reject the promise with a zero value after some time.

本文标签： javascriptDetect user keymouse in Python SeleniumStack Overflow

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