Selenium 找不到链接元素

Question

我正在尝试使用 Selenium 单击此网站上的“登录”按钮：https://results.decisiondeskhq.com/2020/primary/colorado/president。我右击inspect element中的元素，复制xpath，放入find_element_by_xpath函数中。

这是我的代码：

from selenium import webdriver

driver = webdriver.Chrome(executable_path="/users/aliallam/Desktop/scraper test/chromedriver")
url = 'https://results.decisiondeskhq.com/2020/primary/colorado/president'
driver.get(url)

driver.find_element_by_xpath('//*[@id="content"]/div/div/div/div/button').click()

这是我收到的错误消息：

Traceback (most recent call last):
  File "/Users/aliallam/Desktop/scraper test/sandbox2.py", line 7, in <module>
    driver.find_element_by_xpath('//*[@id="content"]/div/div/div/div/button').click()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 394, in find_element_by_xpath
    return self.find_element(by=By.XPATH, value=xpath)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 976, in find_element
    return self.execute(Command.FIND_ELEMENT, {
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id="content"]/div/div/div/div/button"}
  (Session info: chrome=80.0.3987.149)

提前谢谢你！

Answer 1

您需要等到网页加载后才能选择按钮。你需要导入

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

在选择元素之前添加延迟和等待，如下所示：

delay = 10  # seconds
WebDriverWait(driver, delay).until(
    EC.presence_of_element_located((By.CLASS_NAME, 'signup-boxes')))
# you can select element that you want ini here

更多资源请访问here

Answer 2

元素有一个唯一的 id，所以你应该使用 id 而不是使用 xpath，你应该在元素上应用显式等待，以便脚本等待直到元素存在并且上面存在元素的 div您尝试单击的元素，在这种情况下您需要使用 java 脚本单击。
你的代码应该是这样的：

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

driver = webdriver.Chrome(executable_path="/users/aliallam/Desktop/scraper test/chromedriver")
url = 'https://results.decisiondeskhq.com/2020/primary/colorado/president'
driver.get(url)

element = WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.ID, "login-text-btn")))
driver.execute_script("arguments[0].click();", element)