Why Does Selenium Throw a 'NoSuchElementException' When Controlling the QWOP Game in Chrome, and How Can It Be Fixed?

Selenium "NoSuchElementException" When Using Chrome

When using Selenium on Chrome to play the QWOP game, you may encounter the "selenium.common.exceptions.NoSuchElementException" error. This generally occurs when Selenium cannot find the specified element using the given locator.

Reasons for NoSuchElementException

• Invalid or incorrect locator strategy
• Element is not within the browser's viewport
• Element is hidden or has the display attribute set to "none"
• Non-unique locator strategy results in locating a hidden or invisible element
• Element is placed within an iframe
• WebDriver is attempting to locate the element before it's present/visible

Solution

• Use a valid and unique locator strategy. Inspect the element using the browser's Developer Tools.
• Scroll the element into view using the execute_script() method.
• If the element is hidden, remove the display attribute using execute_script().
• Switch to the appropriate iframe if the element is nested within one.
• Use WebDriverWait to wait for the element to be present, visible, or clickable before interacting.

This Usecase

In the provided code, the "selenium.common.exceptions.NoSuchElementException" occurs because the id locator ("window1") does not uniquely identify the canvas element. To resolve this, use the following modified code:

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

browser = webdriver.Chrome()
browser.set_window_size(640, 480)
browser.get('http://www.foddy.net/Athletics.html?webgl=true')
browser.implicitly_wait(10)

canvas = WebDriverWait(browser, 20).until(EC.element_to_be_clickable((By.XPATH, "//canvas[@id='window1']")))
canvas.click()

while (True):
    action = ActionChains(browser)
    action.move_to_element(canvas).perform()
    canvas.click()
    canvas.send_keys("q")

This modification ensures that Selenium waits until the canvas is clickable before attempting to interact with it.

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