selenium move_to_element并不总是鼠标悬停

Question

我使用的是Python2.7。当试图将鼠标悬停在菜单项上时，selenium不会在Chrome中一贯地将鼠标移动到该项上。因此，当点击子菜单时，它最终会点击其他的东西。然而，相同的代码在Firefox驱动程序中引发异常。

我在SO上读到的帖子很少，这表明硒有时是奇怪的。但我搞不清自己是不是做错了什么。

代码如下：

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

driver = webdriver.Chrome()
#driver = webdriver.Firefox()
driver.get("http://www.flipkart.com/watches/pr?p%5B%5D=facets.ideal_for%255B%255D%3DMen&p%5B%5D=sort%3Dpopularity&sid=r18&facetOrder%5B%5D=ideal_for&otracker=ch_vn_watches_men_nav_catergorylinks_0_AllBrands")
driver.maximize_window()
sleep(10)

elm_Men_Menu = driver.find_element_by_xpath("//li[@class='menu-l0 ']/a[@data-tracking-id='men']")
elm_FastTrack_Menu = driver.find_element_by_xpath("//li[@class='menu-item']/a[@data-tracking- id='0_Fastrack']")

builder = ActionChains(driver)
builder.move_to_element(elm_Men_Menu).click(elm_FastTrack_Menu).perform()

Answer 1

您需要一步一步地执行这一操作，使用显式等待检查要与之交互的元素的可见性，不要使用time.sleep()-它不可靠且容易出错：

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

driver = webdriver.Chrome()

driver.get("http://www.flipkart.com/watches/pr?p%5B%5D=facets.ideal_for%255B%255D%3DMen&p%5B%5D=sort%3Dpopularity&sid=r18&facetOrder%5B%5D=ideal_for&otracker=ch_vn_watches_men_nav_catergorylinks_0_AllBrands")
driver.maximize_window()

# wait for Men menu to appear, then hover it
men_menu = WebDriverWait(driver, 10).until(EC.visibility_of_element_located((By.XPATH, "//a[@data-tracking-id='men']")))
ActionChains(driver).move_to_element(men_menu).perform()

# wait for Fastrack menu item to appear, then click it
fastrack = WebDriverWait(driver, 10).until(EC.visibility_of_element_located((By.XPATH, "//a[@data-tracking-id='0_Fastrack']")))
fastrack.click()