使用SeleniumWebDriver、python检索动态值

Question

我知道已经有类似的线索。然而，当尝试以前建议的方法来检索特定的动态表值时，我得到的要么是nbsp值，要么是像"1a207feb-8080-4ff0-..."这样的神秘值

我想做什么：

从here获取黄金的欧元/盎司价值的当前表值。我“检查”了页面，得到了xpath (//*[@id="bullionPriceTable"]/div/table/tbody/tr[3]/td[3]/span)

我的代码：

driver = webdriver.Chrome("path/to/chromedriver")
driver.get("https://www.bullionvault.com/gold-price-chart.do")

xpath = '//*[@id="bullionPriceTable"]/div/table/tbody/tr[3]/td[3]/span'

select=driver.find_element_by_xpath(xpath)
print(select)

这张照片是：

<selenium.webdriver.remote.webelement.WebElement (session="3ade114e9f0907e4eb13deac6a264fc8", element="3a670af5-8594-4504-908a-a9bfcbac7342")>

这显然不是我要找的号码

我还尝试在webElement上使用get_属性（'innerHtml'）和.text，但没有效果。我错过了什么？我只是没有正确地编码这个值，还是从错误的源中提取

Answer 1

等待页面加载，然后尝试获取innerHTML，如下面的示例

import time

from selenium import webdriver

chrome_browser = webdriver.Chrome(
    executable_path=r"chromedriver.exe")

chrome_browser.get("https://www.bullionvault.com/gold-price-chart.do")

time.sleep(2)

select = chrome_browser.find_element_by_xpath(
    "//*[@id='bullionPriceTable']/div/table/tbody/tr[3]/td[3]/span"
).get_attribute("innerHTML")

print(select)

€1,450.98

Answer 2

要提取黄金欧元/盎司价值的表值，即文本€1452.47，您必须为visibility_of_element_located()引入WebDriverWait，并且您可以使用以下任一Locator Strategies：

• 使用XPATH和get_attribute()：

  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions as EC    
  
  driver.get('https://www.bullionvault.com/gold-price-chart.do#')
  WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//div[@class='cookies-warning-buttons']//a[text()='Accept']"))).click()
  driver.execute_script("return arguments[0].scrollIntoView(true);", WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//strong[text()='Live Gold Price']"))))
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//th[text()='Gold Price per Ounce']//following-sibling::td[3]/span[@data-currency='EUR']"))).get_attribute("innerHTML"))
  

• 控制台输出：

  €1,456.30
  

• 使用XPATH和文本属性：

  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions as EC
  
  driver.get('https://www.bullionvault.com/gold-price-chart.do#')
  WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//div[@class='cookies-warning-buttons']//a[text()='Accept']"))).click()
  driver.execute_script("return arguments[0].scrollIntoView(true);", WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//strong[text()='Live Gold Price']"))))
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//th[text()='Gold Price per Ounce']//following-sibling::td[3]/span[@data-currency='EUR']"))).text)
  

• 控制台输出：

  €1,456.30