使用Chrome时的Selenium“Selenium.common.exceptions.NoSuChelementException”

Question

selenium.common.exceptions.NoSuchElementException: 
Message: no such element: Unable to locate element
{"method":"id","selector":"window1"
(Session info: chrome=63.0.3239.108
(Driver info: chromedriver=2.34.522913
(36222509aa6e819815938cbf2709b4849735537c), platform=Linux 4.10.0-42-generic x86_64)

from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
import time

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

canvas = browser.find_element_by_id("window1")

canvas.click()

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

Answer 1

Selenium.common.exceptions.NoSuChelementException通常称为NoSuChelementException定义为：

exception selenium.common.exceptions.NoSuchElementException(msg=None, screen=None, stacktrace=None)

NoSuchelementException基本上在以下两种情况下引发：

>

使用时：

webdriver.find_element_by_*("expression")
//example : my_element = driver.find_element_by_xpath("xpath_expression")

element.find_element_by_*("expression")
//example : my_element = element.find_element_by_*("expression")

    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":".//*[@id='create-portal-popup']/div[4]/div[1]/button[3]"}
  (Session info: chrome=61.0.3163.100)
  (Driver info: chromedriver=2.32.498550 (9dec58e66c31bcc53a9ce3c7226f0c1c5810906a),platform=Windows NT 10.0.10240 x86_64)

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在这里，您将找到关于如何检查Selenium3.6中的元素的详细讨论，因为firebug不再是FF56的选项了？

使用execute_script()方法滚动元素以查看如下：

elem = driver.find_element_by_xpath("element_xpath")
driver.execute_script("arguments[0].scrollIntoView();", elem)

在这里，您将找到关于使用Selenium在Python中滚动到页面顶部的详细讨论

elem = driver.find_element_by_xpath("element_xpath")
driver.execute_script("arguments[0].removeAttribute('style')", elem)
elem.send_keys("text_to_send")

driver.switch_to.frame("iframe_name")
driver.switch_to.frame("iframe_id")
driver.switch_to.frame(1) // 1 represents frame index

element = WebDriverWait(driver, 20).until(expected_conditions.presence_of_element_located((By.XPATH, "element_xpath']")))

要等待visibility_of_element_locited:

element = WebDriverWait(driver, 20).until(expected_conditions.visibility_of_element_located((By.CSS_SELECTOR, "element_css")

等待element_to_be_clickable:

element = WebDriverWait(driver, 20).until(expected_conditions.element_to_be_clickable((By.LINK_TEXT, "element_link_text")))

您会看到NoSuchelementException，因为id定位器没有唯一地标识画布。要标识画布和click()，必须等待画布click，并使用以下代码块：

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

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