How Can I Use Selenium To Record Mathjax Loading Time

I am trying to use selenium get asynchronous elements(MathJax equation) loading time. I try to write a python-selenium script to record the loading time of my website, but my webs

Solution 1:

Try using datetime.utcnow() with timedelta that is:

A duration expressing the difference between two datetime instances to microsecond resolution.

from datetime import datetime, timedelta
from selenium import webdriver
import time
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
source = "url"
driver = webdriver.Chrome()
begin = datetime.utcnow() + timedelta(1)
driver.get(source)
locator = (By.ID, 'MathJax-Element-1-Frame')
WebDriverWait(driver, 20, 0.5).until(EC.presence_of_element_located(locator))
end = datetime.utcnow() + timedelta(1)
finish_time = end - begin

---

Update

This is a function that waits for all pendingRequests to load. It might help in your case too.

def wait_until_loaded(driver, seconds: int = 30) -> None:
    java_script_to_load = "var injector = window.angular.element('body').injector();"\
                                  " var $http = injector.get('$http');" \
                                  "return ($http.pendingRequests.length === 0);"
    end_time = datetime.utcnow() + timedelta(seconds=seconds)
    print("wait for All Elements....")
    while datetime.utcnow() <= end_time:
        try:
            if driver.execute_script(java_script_to_load):
                print(f"loaded in"
                      f" {datetime.utcnow() + timedelta(seconds=seconds) - end_time}seconds")
                sleep(1)
                return
        except WebDriverException:
            continuesleep(0.1)
    raise TimeoutError("waiting for elements for too long")

Hope this helps you!