检查元素是否存在 python selenium
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Check if element exists python selenium
提问by Nelly Kong
I'm trying to locate element by
我正在尝试通过以下方式定位元素
element=driver.find_element_by_partial_link_text("text")
in Python selenium and the element does not always exist. Is there a quick line to check if it exists and get NULL or FALSE in place of the error message when it doesn't exist?
在 Python selenium 中，元素并不总是存在。是否有快速行来检查它是否存在并在它不存在时获取 NULL 或 FALSE 来代替错误消息？
回答by Andersson
You can implement try/exceptblock as below to check whether element present or not:
您可以按如下方式实现try/except块来检查元素是否存在：
from selenium.common.exceptions import NoSuchElementException
try:
element=driver.find_element_by_partial_link_text("text")
except NoSuchElementException:
print("No element found")
or check the same with one of find_elements_...()methods. It should return you empty list or list of elements matched by passed selector, but no exception in case no elements found:
或使用其中一种find_elements_...()方法进行检查。它应该返回空列表或由传递的选择器匹配的元素列表，但在没有找到元素的情况下也不例外：
elements=driver.find_elements_by_partial_link_text("text")
if not elements:
print("No element found")
else:
element = elements[0]
回答by Alex Makarenko
Sometimes the element does not appear at once, for this case we need to use explicit wait:
有时元素不会立即出现，对于这种情况我们需要使用显式等待：
browser = webdriver.Chrome()
wait = WebDriverWait(browser, 5)
def is_element_exist(text):
try:
wait.until(EC.presence_of_element_located((By.PARTIAL_LINK_TEXT, text)))
except TimeoutException:
return False
Solution without try/ except:
没有的解决方案try/ except：
def is_element_exist(text):
elements = wait.until(EC.presence_of_all_elements_located((By.PARTIAL_LINK_TEXT, text)))
return None if elements else False
How explicit wait works you can read here.
您可以在此处阅读显式等待的工作原理。
Imports:
进口：
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
