我正在嘗試使用CSS 選擇器使用 python for selenium登錄到Investors Business Daily服務。我在 chrome 瀏覽器控制臺中成功運行的 input 標簽下找到了一個獨特的屬性：
$$("[data-gigya-placeholder='Email']")
但是，相應的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']")
完整的錯誤日志：
NoSuchElementException Traceback（最近一次呼叫最后一次）~\AppData\Local\Temp/ipykernel_26004/2365346870.py in 1 # 找到輸入用戶名的元素 2 #login = driver.find_element_by_css_selector("input[data-gigya-placeholder='Email ']") ----> 3 login = 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回傳 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 如果回應： - -> 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: Message: no such element: Unable to locate element: {"method":"css selector","selector":"[data-gigya-placeholder='Email']"}
I've tried an alternative python syntax which results in a similar error message:
login = driver.find_element(By.CSS_SELECTOR, "[data-gigya-placeholder='Email']")
Full Error Log:
NoSuchElementException Traceback (most recent call last) ~\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：訊息：沒有這樣的元素：無法定位元素：{"method":"css selector","selector":"[data-gigya-placeholder='Email']"}
uj5u.com熱心網友回復：
首先，此元素位于 iframe 內，因此您必須切換到該 iframe 才能訪問該元素。
你也錯過了等待/延遲。
在訪問元素之前，您應該等待該元素準備就緒。
最好的方法是使用預期條件的顯式等待。
請嘗試以下操作：
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']")))
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