python - CSS 选择器在浏览器控制台中有效，但在 Python 中无效

Question

我正在尝试使用CSS 选择器使用 python登录到Investors Business Daily服务。我在 chrome 浏览器控制台中成功运行的输入标记下发现了一个唯一属性：

$$("[data-gigya-placeholder='Email']")

但是，对应的 python 不起作用：

from selenium import webdriver
driver = webdriver.Chrome()
driver.get("https://myibd.investors.com/secure/signin.aspx?eurl=https://marketsmith.investors.com/")

login = driver.find_element_by_css_selector("[data-gigya-placeholder='Email']")

完整的错误日志：

NoSuchElementException Traceback (最近一次调用最后一次) ~\AppData\Local\Temp/ipykernel_26004/2365346870.py in 1 # 找到输入用户名的元素 2 #login = driver.find_element_by_css_selector("input[data-gigya-placeholder='Email ']") ----> 3 登录 = driver.find_element_by_css_selector("[data-gigya-placeholder='Email']") 4 5

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\webdriver.py in find_element_by_css_selector(self, css_selector) 596 element = driver.find_element_by_css_selector('#foo') 597 """ --> 598返回 self.find_element(by=By.CSS_SELECTOR, value=css_selector) 599 600 def find_elements_by_css_selector(self, css_selector):

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\webdriver.py in find_element(self, by, value) 974 by = By.CSS_SELECTOR 975 value = '[name="%s"] ' % value --> 976 return self.execute(Command.FIND_ELEMENT, { 977 'using': by, 978 'value': value})['value']

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\webdriver.py in execute(self, driver_command, params) 319 response = self.command_executor.execute(driver_command, params) 320 if response: - -> 321 self.error_handler.check_response(response) 322 response['value'] = self._unwrap_value(323 response.get('value', None))

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\errorhandler.py in check_response(self, response) 240 alert_text = value['alert'].get('text') 241 raise exception_class( message, screen, stacktrace, alert_text) --> 242 raise exception_class(message, screen, stacktrace) 243 244 def _value_or_default(self, obj, key, default):

NoSuchElementException：消息：没有这样的元素：无法找到元素：{“method”：“css selector”，“selector”：“[data-gigya-placeholder='Email']”}

我尝试了另一种 python 语法，它会导致类似的错误消息：

login = driver.find_element(By.CSS_SELECTOR, "[data-gigya-placeholder='Email']")

完整错误日志：

NoSuchElementException Traceback（最近一次通话最后）~\AppData\Local\Temp/ipykernel_23192/47655697.py in ----> 1 login = driver.find_element(By.CSS_SELECTOR, "[data-gigya-placeholder='Email'] ")

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\webdriver.py in find_element(self, by, value) 974 by = By.CSS_SELECTOR 975 value = '[name="%s"] ' % value --> 976 return self.execute(Command.FIND_ELEMENT, { 977 'using': by, 978 'value': value})['value']

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\webdriver.py in execute(self, driver_command, params) 319 response = self.command_executor.execute(driver_command, params) 320 if response: - -> 321 self.error_handler.check_response(response) 322 response['value'] = self._unwrap_value(323 response.get('value', None))

~\miniconda3\envs\selenium_env\lib\site-packages\selenium\webdriver\remote\errorhandler.py in check_response(self, response) 240 alert_text = value['alert'].get('text') 241 raise exception_class( message, screen, stacktrace, alert_text) --> 242 raise exception_class(message, screen, stacktrace) 243 244 def _value_or_default(self, obj, key, default):

NoSuchElementException：消息：没有这样的元素：无法找到元素：{“method”：“css selector”，“selector”：“[data-gigya-placeholder='Email']”}

标签： pythonseleniumcss-selectorsselenium-chromedriver

Answer 1

首先这个元素在 iframe 里面，所以你必须切换到那个 iframe 才能访问那个元素。
你也错过了等待/延迟。
在访问它之前，您应该等待元素准备好。
最好的方法是使用预期条件的显式等待。
尝试以下操作：

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
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, 20)

driver.get("https://myibd.investors.com/secure/signin.aspx?eurl=https://marketsmith.investors.com/")

WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"#signin-iframe")))

login = wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, "[data-gigya-placeholder='Email']")))