消息：没有这样的元素：无法找到元素：{“方法”：“ css选择器”，“选择器”：“ [id =“ loginUsername”]“}

Question

我正在尝试使用Selenium学习使用Python进行Web爬网。我正在测试Reddit.com。我被困在这里。当我运行脚本时，它会在登录页面上停止，并显示以下错误： （selenium.common.exceptions.NoSuchElementException：消息：没有这样的元素：无法找到元素：{“ method”：“ css选择器”，“ selector”：“ [id =” loginUsername“]”}） 请注意，相同的代码在登录页面上可以正常工作，但在弹出的登录页面上则无法工作。它也在iframe中。

代码如下：

from selenium import webdriver
from selenium.webdriver.chrome.options import Options

option = Options()

option.add_argument("--disable-infobars")
option.add_argument("start-maximized")
option.add_argument("--disable-extensions")
option.add_experimental_option("excludeSwitches", ['enable-automation'])

# Pass the argument 1 to allow and 2 to block
option.add_experimental_option("prefs", { 
    "profile.default_content_setting_values.notifications": 1 
})
driver = webdriver.Chrome(chrome_options=option, executable_path='C:\\Users\\Sheik\\Desktop\\web crawling\\chromedriver.exe')

driver.get('https://www.reddit.com')

# clicking on the login button
login_btn = driver.find_element_by_xpath('//*[@id="SHORTCUT_FOCUSABLE_DIV"]/div[1]/header/div/div[2]/div[2]/div[1]/a[1]')
login_btn.click()

# calling the iFrame page
frame = driver.find_element_by_class_name('_25r3t_lrPF3M6zD2YkWvZU')
driver.switch_to.frame(frame)

# sending the username 
username_field = driver.find_element_by_id('loginUsername')
username_field.click()
username_field.send_keys('test_username')

# sending the password
password_field = driver.find_element_by_id('loginPassword')
password_field.click()
password_field.send_keys('test_pass')

# clicking the login submit button
submit_btn = driver.find_element_by_class_name('AnimatedForm__submitButton')
submit_btn.click()

Answer 1

在处理iframe上的元素时，您需要处理字段集。请找到以下工作解决方案：

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


driver = webdriver.Chrome(executable_path=r"C:\New folder\chromedriver.exe")
driver.maximize_window()
driver.get('https://www.reddit.com')

# clicking on the login button
login_btn = driver.find_element_by_xpath('//*[@id="SHORTCUT_FOCUSABLE_DIV"]/div[1]/header/div/div[2]/div[2]/div[1]/a[1]')
login_btn.click()



driver.implicitly_wait(10)
page_title = driver.title


frame = driver.find_element_by_xpath("//iframe[@class='_25r3t_lrPF3M6zD2YkWvZU']")
driver.switch_to.frame(0)


print("alert accepted")
driver.implicitly_wait(10)

username = WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.XPATH, "//fieldset//input[@id='loginUsername']")))
username.send_keys('test_username')

pwd = WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.XPATH, "//fieldset//input[@id='loginPassword']")))
pwd.send_keys('password')

login_btn = WebDriverWait(driver, 15).until(EC.element_to_be_clickable((By.XPATH, "//fieldset//button[@class='AnimatedForm__submitButton']")))
login_btn.click()

输出：

Answer 2

尝试一下：

wait = WebDriverWait(driver, 10)
wait.until(EC.visibility_of((By.ID, 'loginUsername')))
username_field = driver.find_element_by_id('loginUsername')
username_field.send_keys('test_username')