expose_function function

[3mora2]

Hello, there is way to add function like expose_function, it in playwright ?

The method adds a function called name on the window object of every frame in the page. When called, the
function executes callback and returns a [Promise] which resolves to the return value of callback.

[mdmintz]

You can achieve the same effect by using self.execute_script() in seleniumbase:

import hashlib
from seleniumbase import BaseCase
BaseCase.main(__name__, __file__)

class MyTest(BaseCase):
    def sha256(self, text):
        m = hashlib.sha256()
        m.update(bytes(text, "utf8"))
        return m.hexdigest()

    def test_expose(self):
        code = self.sha256("hello")
        self.execute_script("window.code='%s';" % code)
        print(self.execute_script("return window.code;"))

If you just need to pass variables around, you can use standard Python for that. You can also save variables to self.

[3mora2]

Thanks for the response, expose_function used for callback, i mean set js callback for event like receive new message then call callback function to do things.
Scenario like:

set callback python function receive_message into js
when new message receive in js

js return call python function receive_message
print new message in python

[mdmintz]

It can all be done via self.execute_script(). I would need to see a very specific example to show you a SeleniumBase equivalent.

[3mora2]

from playwright.sync_api import sync_playwright


def receive_message(*args, **kwargs):
    """callback function"""
    print(args, kwargs)


# Open page
playwright = sync_playwright().start()
browser = playwright.chromium.launch(channel="chrome", headless=False)
context = browser.new_context(no_viewport=True)
page = context.new_page()

page.goto("https://www.google.com/")
# set callback function
page.expose_function("receive_message", receive_message)
# add for listen for events
page.wait_for_timeout(1000000)

[mdmintz]

The alternative: https://github.com/seleniumbase/SeleniumBase/blob/master/examples/test_console_logging.py

Related methods:

self.start_recording_console_logs()
self.console_log_string(string)
self.console_log_script(script)
self.get_recorded_console_logs()

Create a loop, read console logs, and perform an action in Python if a string is found.

[3mora2]

calling function from console,it is as example,
I try convert wppconnect to python WPP_Whatsapp, by using playwright, but it is not thread safe, so I am try SeleniumBase and need:

• listen for driver reload page to inject js to whatsapp here
• listen for event like (new mesage, status,....) receive from js code
  • create handel_func in python for listen js event and handel receive data
  • expose python function handel_func to js window as window['onMessage'] for example here
  • then add js listen for new message, if receive message call window['onMessage'](object) refere to handel_func here