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社区首页 >问答首页 >如何处理StaleElementReferenceException (Selenium )？

问如何处理StaleElementReferenceException (Selenium )？
EN

Stack Overflow用户
提问于 2022-04-10 06:58:30
回答 2查看 87关注 0票数 0

我正在使用python中的selenium为https://etherscan.io/编写一个刮板。在我的代码中，当StaleElementReferenceException单击一个按钮而没有找到任何解决此错误的好源时，它就会在代码中得到它。

这是密码

代码语言：javascript
复制
url = "https://etherscan.io/login?"
driver.implicitly_wait(30)
driver.get(url)
username = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_txtUserName"]')
username.send_keys('user')
password = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_txtPassword"]')
password.send_keys('pass')
login = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_btnLogin"]')
login.click()
more = driver.find_element_by_xpath('//*[@id="moreMegaMenu"]')
more.click()
word_cloud = driver.find_element_by_xpath('//*[@id="LI41"]/a').click()
soup = BeautifulSoup(driver.page_source, 'html.parser')
wait = WebDriverWait(driver, 10)
dropdown = driver.find_elements_by_css_selector('.dropdown-toggle')
for ele in dropdown:
    ele.click()
    time.sleep(1)
    account = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,'.d-block')))
    driver.execute_script("arguments[0].click();", account)
    time.sleep(1)
    driver.execute_script("window.history.go(-1)")

错误信息：

代码语言：javascript
复制
StaleElementReferenceException: Message: stale element reference: element is not attached to the page document
  (Session info: chrome=100.0.4896.75)
代码语言：javascript
复制
StaleElementReferenceException            Traceback (most recent call last)
<ipython-input-108-2804d338c51f> in <module>
      1 dropdown = driver.find_elements_by_css_selector('.dropdown-toggle')
      2 for ele in dropdown:
----> 3     ele.click() # this is the line where it is showing error
      4     time.sleep(1)
      5     account = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,'.d-block')))
screen-scraping
staleelementreferenceexception
python
selenium
EN

回答 2

Stack Overflow用户

发布于 2022-04-10 07:49:19

问题解释：

当您单击帐户时，如下所示：

代码语言：javascript
复制
driver.execute_script("arguments[0].click();", account)

这是将您重定向到same tab and windows中的一个same tab and windows。

但是，当返回到主页时，可以使用：

代码语言：javascript
复制
driver.execute_script("window.history.go(-1)")

现在，这些元素在自然界中已经变得陈旧了。

另外，您不应该真正地单击more按钮，而应该使用ActionChain在其上悬停。

而这条线

代码语言：javascript
复制
account = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR,'.d-block')))

对于第二个元素和后续元素不起作用，因为.d-block不是所有其他下拉列表的正确定位器。相反，使用相对xpath

代码语言：javascript
复制
.//following-sibling::div/a

解决方案：

继续在循环中定义web元素。

代码：

代码语言：javascript
复制
wait = WebDriverWait(driver, 20)

url = "https://etherscan.io/login?"
driver.maximize_window()
#driver.implicitly_wait(30)
driver.get(url)
username = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_txtUserName"]')
username.send_keys('user')
password = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_txtPassword"]')
password.send_keys('pass')
login = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_btnLogin"]')
login.click()

try:
    wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, "button#btnCookie"))).click()
    print('clicked on cookies button successfully.')
except:
    print('could not clicked on cookies button.')
    pass

more = wait.until(EC.element_to_be_clickable((By.XPATH, "//*[@id='moreMegaMenu']")))
ActionChains(driver).move_to_element(more).pause(2).perform()

word_cloud = wait.until(EC.element_to_be_clickable((By.XPATH, "//*[@id='LI41']/a")))
word_cloud.click()

soup = BeautifulSoup(driver.page_source, 'html.parser')

dropdown = driver.find_elements_by_css_selector('.dropdown-toggle')
i = 1
for ele in dropdown:
    ele = wait.until(EC.presence_of_element_located((By.XPATH, f"(//button[contains(@class,'dropdown-toggle')])[{i}]")))
    driver.execute_script("arguments[0].scrollIntoView(true);", ele)
    ele.click()
    time.sleep(1)
    account = wait.until(EC.element_to_be_clickable((By.XPATH, ".//following-sibling::div/a")))
    driver.execute_script("arguments[0].click();", account)
    time.sleep(1)
    driver.execute_script("window.history.go(-1)")
    i = i + 1

输出：

代码语言：javascript
复制
clicked on cookies button successfully.
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.85 @ 0.07608 BTC (+1.09%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.71 @ 0.07609 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.53 @ 0.07608 BTC (+1.08%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,244.39 @ 0.07608 BTC (+1.07%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,243.26 @ 0.07607 BTC (+1.06%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.79 @ 0.07606 BTC (+1.04%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.50 @ 0.07606 BTC (+1.03%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,242.14 @ 0.07607 BTC (+1.02%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)
ETHER PRICE $3,241.93 @ 0.07607 BTC (+1.01%)

以此类推。

票数 0
EN

Stack Overflow用户

发布于 2022-04-10 08:05:25

@cruisepandey解决方案是可以的，但我认为我的解决方案更简单一些。而且，在我的例子中，他的解决方案重定向到错误的页面(到主页)。

代码语言：javascript
复制
url = "https://etherscan.io/login?"
driver.implicitly_wait(30)
driver.get(url)
username = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_txtUserName"]')
username.send_keys('user')
password = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_txtPassword"]')
password.send_keys('pass')
login = driver.find_element_by_xpath('//*[@id="ContentPlaceHolder1_btnLogin"]')
login.click()
more = driver.find_element_by_xpath('//*[@id="moreMegaMenu"]')
more.click()
word_cloud = driver.find_element_by_xpath('//*[@id="LI41"]/a').click()
soup = BeautifulSoup(driver.page_source, 'html.parser')
wait = WebDriverWait(driver, 10)

num_elements = len(driver.find_elements_by_css_selector('.dropdown-toggle'))

for i in range(num_elements):
    ele = driver.find_elements_by_css_selector('.dropdown-toggle')[i]
    ele.click()
    time.sleep(1)
    account = wait.until(EC.element_to_be_clickable((By.XPATH, f'//*[@id="content"]/div[3]/div/div/div[3]/div[{i+1}]/div/div/a[1]')))
    driver.execute_script("arguments[0].click();", account)
    time.sleep(1)
    driver.execute_script("window.history.go(-1)")
    time.sleep(1)
票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/71814421

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