What is the correct syntax checking the .readyState of a website in Selenium Python?

问题

I'm trying to check the .readyState of a website using .execute_script but I keep getting an error.

I'm using a pageLoadStrategy of "none" in chromedriver so I'm trying to test that the websites readystate is no longer "loading".

Note: this question is Python-specific.

WebDriverWait(driver, timeout=20).until(
    driver.execute_script('return document.readyState') == 'interactive'
)

value = method(self._driver) TypeError: 'str' object is not callable

I've also tried using lambda which doesn't throw an error, however printing the readystate will return conflicting results.

WebDriverWait(driver, timeout=20).until(
    lambda driver: driver.execute_script('return document.readyState') == 'interactive'
)
print(driver.execute_script('return document.readyState'))

loading

回答1:

Using pageLoadStrategy as none and then using WebDriverWait for document.readyState as interactive won't be a good approach. You can use either pageLoadStrategy or WebDriverWait for document.readyState as follows:

To configure pageLoadStrategy as None you can use either of the following solutions:

• Firefox :

  from selenium import webdriver
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  
  caps = DesiredCapabilities().FIREFOX
  caps["pageLoadStrategy"] = "none"
  #caps["pageLoadStrategy"] = "eager"  #  interactive
  #caps["pageLoadStrategy"] = "normal"  #  complete
  driver = webdriver.Firefox(desired_capabilities=caps, executable_path=r'C:\Utility\BrowserDrivers\geckodriver.exe')
  driver.get("http://google.com")
  

• Chrome :

  from selenium import webdriver
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  
  caps = DesiredCapabilities().CHROME
  caps["pageLoadStrategy"] = "none"
  #caps["pageLoadStrategy"] = "eager"  #  interactive
  #caps["pageLoadStrategy"] = "normal"  #  complete
  driver = webdriver.Chrome(desired_capabilities=caps, executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe')
  driver.get("http://google.com")
  

Using WebDriverWait to wait for document.readyState as eager:

WebDriverWait(driver, 20).until(lambda driver: driver.execute_script("return document.readyState").equals("interactive"))

Using WebDriverWait to wait for document.readyState as normal:

WebDriverWait(driver, 20).until(lambda driver: driver.execute_script("return document.readyState").equals("complete"))

You can find a detailed discussion in How to make Selenium not wait till full page load, which has a slow script?

---

Outro

Do we have any generic function to check if page has completely loaded in Selenium

回答2:

You can move the condition into the JS:

WebDriverWait(driver, timeout=20).until(
    lambda driver: driver.execute_script('return document.readyState === "interactive"')
)
print(driver.execute_script('return document.readyState'))

If the website is in angular you can use pendingRequests.length === 0 see this answer.

Hope this helps!

来源：https://stackoverflow.com/questions/56728656/what-is-the-correct-syntax-checking-the-readystate-of-a-website-in-selenium-pyt