即使 x 路径正确，Selenium Python 脚本也不会引发元素错误异常？

Question

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
from selenium.webdriver.common.keys import Keys
driver=webdriver.Chrome()
driver.get("https://paytm.com/")
driver.maximize_window()
driver.find_element_by_class_name("login").click()
driver.implicitly_wait(10)
driver.find_element_by_xpath("//md-input-container[@class='md-default-theme md-input-invalid']/input[@id='input_0']").send_keys("99991221212")

在上面的代码中，我使用 fire bug 验证了 xpath，它突出显示了正确的元素。但是当脚本运行失败时？大家能帮帮我吗？

Answer 1

在 selenium 中，每一帧都是单独处理的。由于登录位于单独的iframe 元素中，因此您需要先使用以下命令切换到它：

iframe = driver.find_elements_by_tag_name('iframe')[0]
driver.switch_to_frame(iframe) 

在尝试与其元素交互之前。

或者在这种情况下，你会等待框架存在，它会是：

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()
driver.get("https://paytm.com/")
driver.maximize_window()

wait = WebDriverWait(driver, 10)

wait.until(EC.visibility_of_element_located((By.CLASS_NAME, "login"))).click()
wait.until(EC.frame_to_be_available_and_switch_to_it((By.TAG_NAME, "iframe")))

_input = wait.until(EC.visibility_of_element_located((By.ID,"input_0")))
_input.send_keys("99991221212")

Answer 2

您应该尝试使用WebDriverWait 等到页面上显示input 元素，如下所示：-

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()
driver.get("https://paytm.com/")
driver.maximize_window()

wait = WebDriverWait(driver, 10)

wait.until(EC.visibility_of_element_located((By.CLASS_NAME, "login"))).click()

#now switch to iframe first      
wait.until(EC.frame_to_be_available_and_switch_to_it((By.TAG_NAME, "iframe")))

input = wait.until(EC.visibility_of_element_located((By.ID, "input_0")))
input.send_keys("99991221212")

希望对您有所帮助...:)