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Tried to execute this script in selenium Python 4.7.2 with this line of code:

driver.execute_script('document.querySelector(".ck-placeholder").innerHTML = "TEST";')

I have checked DevTools, and the element does exist.

When running the code over this error appears:

selenium.common.exceptions.JavascriptException: Message: javascript error: Cannot set properties of null (setting 'innerHTML')

I am trying to make a automatic messager bot that sends messages in Microsoft Teams via Selenium Python. I do know that there are other ways to send messages via apis, eg. but I want to learn Seleneium via this project.

The element: .ck-placeholder is the input field of Microsoft Teams (Messaging).

Here is the GitHub: https://github.com/LucasoDevDotTk/automatic_login_microsoft, send_msg.py is the file I'm working on

Expected results: innerHTML of .ck-placeholder to be replaced with "TEST"

Possible Causes: I havent checked if this is correct but .ck-placeholder is placed in an iframe, may this be the issue?

Picture of the iframe in devtools

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Lucas Nguyen
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  • Even though the element exists, often in integration testing using frameworks like Selenium, you have to wait until the test has loaded the component prior to accesing it's properties. So although the page has it, the test at that point of execution may not have it loaded. Can you paste the entire script? – Drew Gallagher Jan 14 '23 at 17:05
  • I have just added a link to the GitHub repository :) – Lucas Nguyen Jan 14 '23 at 17:10
  • If you are looking how to improve a Stack Overflow question, [this](https://stackoverflow.com/help/how-to-ask) might be helpful. – Pawel Kam Jan 14 '23 at 22:47

1 Answers1

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The desired element is within an iframe so first you have to induce WebDriverWait for the frameToBeAvailableAndSwitchToIt as follows:

WebDriverWait(driver, 20).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe.embedded-electron-webview.embedded-page-content")))
driver.execute_script('document.querySelector(".ck-placeholder").innerHTML = "TEST";')

Note : You have to add the following imports :

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
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