python-3.x - Python Selenium在网站上找不到href时

Question

我在此特定网站上找不到社交媒体链接:
https://www.digitalrealty.com/

我使用的代码:

url = 'https://www.digitalrealty.com/'
driver.get('https://www.digitalrealty.com/')
fb_link = driver.find_element_by_css_selector("a[href*='facebook.com']").get_attribute("href")

但是，在我运行代码后，python返回“NoSuchElementException”。实际上，当我浏览网站并向下滚动时，社交媒体帐户仅位于底部。我不确定是否是因为页面未完全加载？但是.get()默认不是在等待页面加载吗？

我仍然是处理这些错误的新手。任何帮助，将不胜感激。提前致谢!

Answer 1

该网站以滚动方式加载内容，这就是为什么要进入需要滚动到页面底部的社交媒体帐户的原因。
要等待某些条件，您必须使用WebDriverWait和expected_conditions，有关等待的更多详细信息，您可以找到here。

这是您的代码:

from selenium import webdriver
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()
wait = WebDriverWait(driver, 5)

url = "https://www.digitalrealty.com/"

driver.get(url)

#Scroll to the bottom
driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")

#Wait until presence of the facebook element. Presence of element=exist in the DOM, but can be not visible like here.
facebook = wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, "a[href*=facebook]")))

#Scroll to element will make element visible and we'll able to click or get text, attribute from it
driver.execute_script("arguments[0].scrollIntoView(true);", facebook)

#Wait for facebook element to be visible and click on it.
fb = wait.until(EC.visibility_of(facebook)).get_attribute("href")
print(fb)