蟒蛇。硒。 drag_and_drop错误'AttributeError：move_to需要WebElement'

Question

请告诉我，我做错了什么？ 我尝试在Selenium中拖放，但是每次遇到错误“ AttributeError：move_to需要WebElement”

这是我的代码：

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

chromedriver = '/usr/local/bin/chromedriver'

driver = webdriver.Chrome(chromedriver)
driver.get('http://www.dhtmlgoodies.com/scripts/drag-drop-custom/demo-drag-drop-3.html')

source = driver.find_elements_by_xpath('//*[@id="box3"]')
target = driver.find_elements_by_xpath('//*[@id="box103"]')

action = ActionChains(driver)
action.drag_and_drop(source, target).perform()

我也这样尝试过：

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

chromedriver = '/usr/local/bin/chromedriver'

driver = webdriver.Chrome(chromedriver)
driver.get('http://www.dhtmlgoodies.com/scripts/drag-drop-custom/demo-drag-drop-3.html')

source = driver.find_elements_by_xpath('//*[@id="box3"]')
target = driver.find_elements_by_xpath('//*[@id="box103"]')
ActionChains(driver).click_and_hold(source).move_to_element(target).release(target).perform()

总是出现“ AttributeError：move_to需要WebElement”

Traceback (most recent call last):
  File "drag_and_drop_test.py", line 13, in <module>
    ActionChains(driver).click_and_hold(source).move_to_element(target).release(target).perform()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/selenium/webdriver/common/action_chains.py", line 121, in click_and_hold
    self.move_to_element(on_element)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/selenium/webdriver/common/action_chains.py", line 273, in move_to_element
    self.w3c_actions.pointer_action.move_to(to_element)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/selenium/webdriver/common/actions/pointer_actions.py", line 42, in move_to
    raise AttributeError("move_to requires a WebElement")
AttributeError: move_to requires a WebElement

Answer 1

find_elements_by_xpath返回一个WebElement的列表，drag_and_drop（和其他方法）接受单个WebElement。使用find_element_by_xpath

source = driver.find_element_by_xpath('//*[@id="box3"]')
target = driver.find_element_by_xpath('//*[@id="box103"]')

Answer 2

@guy所说：

find_elements_by_xpath

返回WebElements的列表。您可以使用find_element_by_xpath方法来获取单个Web元素。或从WebElements返回的find_elements_by_xpath中选择特定元素。例如，如果您知道，则想从返回列表中为目标选择第二个元素。然后您可以尝试这样：

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

chromedriver = '/usr/local/bin/chromedriver'

driver = webdriver.Chrome(chromedriver)
driver.get('http://www.dhtmlgoodies.com/scripts/drag-drop-custom/demo-drag-drop-3.html')

source = driver.find_elements_by_xpath('//*[@id="box3"]')[0]
target = driver.find_elements_by_xpath('//*[@id="box103"]')[1]

action = ActionChains(driver)
action.drag_and_drop(source, target).perform()

我可以看到我们正在选择具有id的元素，但是id是唯一的，因此只能有一个id。因此，您也可以这样：

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

chromedriver = '/usr/local/bin/chromedriver'

driver = webdriver.Chrome(chromedriver)
driver.get('http://www.dhtmlgoodies.com/scripts/drag-drop-custom/demo-drag-drop-3.html')

source = driver.find_element_by_id('box3')
target = driver.find_element_by_id('box103')

action = ActionChains(driver)
action.drag_and_drop(source, target).perform()

我喜欢使用find_element_by_id，因为它对我来说比xpath干净。

Answer 3

使用 find_elements_by_xpath 代替 find_element_by_xpath

Answer 4

此错误消息...

AttributeError: move_to requires a WebElement

...表示move_to_element()需要一个 WebElement 作为参数。

您似乎很近。您已使用find_elements_by_xpath()返回了 List ，并根据需要在move_to_element()中传递了 WebElement 。

解决方案

在文本为美国的元素内拖动文本为华盛顿的元素，并 drop Selenium您必须为element_to_be_clickable()引入 WebDriverWait ，并且可以使用以下Locator Strategies：

• 代码块：

  driver.get('http://www.dhtmlgoodies.com/scripts/drag-drop-custom/demo-drag-drop-3.html')
  source = WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//div[@class='dragableBox' and @id='box3']")))
  target = WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//div[@class='dragableBoxRight' and @id='box103']")))
  ActionChains(driver).click_and_hold(source).move_to_element(target).release(target).perform()
  

• 注意：您必须添加以下导入：

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

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