等待在Selenium中使用Python（iframe）单击

Question

我尝试使用Selenium访问以下页面 https://view.officeapps.live.com/op/view.aspx?src=https%3A//scholar.harvard.edu/files/torman_personal/files/samplepptx.pptx

虽然页面在Firefox/Chrome中正确显示，但Selenium找不到加载页面的元素。由于未找到元素PptUpperToolbar.LeftButtonDock.PrintToPdf-Medium20，下面的代码导致“TimeoutException”消息

我错过了什么

# Load ppackages
import urllib.parse
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

# Define page
file = urllib.parse.quote("https://scholar.harvard.edu/files/torman_personal/files/samplepptx.pptx")
link = "http://view.officeapps.live.com/op/view.aspx?src=" + file

# Setup Webdriver 
driver = webdriver.Firefox()
driver.get(link)

# Define wait for "Print to PDF" button to show up
wait = WebDriverWait(driver, 20)
element = wait.until(EC.element_to_be_clickable((By.ID, "PptUpperToolbar.LeftButtonDock.PrintToPdf-Medium20")))

# Check page
# element.get_attribute('outerHTML')
# element.get_attribute('innerHTML')

# Click element
element.click()

Answer 1

按钮在iframe中。你需要切换到iframe

wait.until(EC.frame_to_be_available_and_switch_to_it((By.ID, "wacframe")))
wait.until(EC.element_to_be_clickable((By.ID, "PptUpperToolbar.LeftButtonDock.PrintToPdf-Medium20"))).click()