Python 的 StaleElementException

Question

我正在尝试从下拉菜单中提取表格，但我不断收到异常错误，即元素未在最后一个循环中附加到文档。我认为这与点击提交时页面刷新有关。

我的代码：

###Purpose: To retrieve gp election data 

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

## wesbsite details
driver = webdriver.Chrome(executable_path = '/usr/local/bin/chromedriver')
driver.get('http://wbsec.gov.in/results/panchayat_election_detailed_result?election_year=2013')
driver.maximize_window()

## dropdown menu 
elements=driver.find_elements_by_tag_name("input")
for element in elements:
    if element.get_attribute("value")=="PANCHAYAT SAMITY":
        element.click()
        districts = Select(driver.find_element_by_id('zilla_parishad'))
        for district in districts.options:
            district.click()
            time.sleep(1)
            blocks=Select(driver.find_element_by_id('panchayat_samity'))
            for block in blocks.options:
                 block.click()
                 time.sleep(1)
                 poles=Select(driver.find_element_by_id('election_date'))
                 for pole in poles.options:
                     pole.click()
                     time.sleep(1)
                     test = driver.find_element_by_xpath("//input[@type='submit']").click()
                     time.sleep(5)

错误出现在这一行：

driver.find_element_by_xpath("//input[@type='submit']").click()

我认为问题在于页面没有足够的时间来加载。我尝试增加睡眠时间以及使用WebDriverWait，但每次都会遇到相同的错误。

Answer 1

问题不是没有时间加载而是元素是no longer fresh and accessible

您可能想尝试在收到此错误时合并一种刷新页面的方法，以便再次拥有此元素。

另一种方法是保存每次搜索时用来查找元素的文本，而不是保存物理元素来搜索每个循环。

即：

for i in range(len(driver.find_elements_by_tag_name("input"))):
    if driver.find_elements_by_tag_name("input")[i].get_attribute("value")=="PANCHAYAT SAMITY":
        driver.find_elements_by_tag_name("input")[i].click()

Answer 2

发生的情况是您正尝试使用此for district in districts.options 从下拉列表中选择选项，其中--Select-- 也作为选项。当您点击Get Results 时，该页面会将我们带到其他地方。我们需要忽略--Select-- 选项，所以for loop 应该是这样的for i in range(1,len(districts)):

并且点击Get Results后Selenium将无法识别之前的选项，所以我们需要再次在for loop里面找到那些选项。否则会抛出 Element not attached to the page 异常。

最后，对于某些选项，Polling Date 可能什么都没有，所以抛出 List of index out of range。所以把它放在 try 块中。

import time
from selenium import webdriver
from selenium.webdriver.support.ui import Select

driver = webdriver.Chrome(executable_path = 'path to chromedriver.exe')
driver.get('http://wbsec.gov.in/results/panchayat_election_detailed_result?election_year=2013')
driver.maximize_window()
driver.implicitly_wait(30)

driver.find_element_by_id("search_type_ps").click()
option1 = Select(driver.find_element_by_id("zilla_parishad")).options
for i in range(1,len(option1)):
    try:
        option1 = Select(driver.find_element_by_id("zilla_parishad")).options
        print("Options 1 :{}".format(option1[i].text))
        option1[i].click()
        time.sleep(2)
        options2 = Select(driver.find_element_by_id("panchayat_samity")).options
        opt2list = []
        for j in range(1,len(options2)):
            options2 = Select(driver.find_element_by_id("panchayat_samity")).options
            print("Options 2 : {}".format(options2[j].text))
            # opt2list.append(opt2.text)
            options2[j].click()
            time.sleep(2)
            options3 = Select(driver.find_element_by_id("election_date")).options
            try:
                for k in range(1,len(options3)):
                    options3 = Select(driver.find_element_by_id("election_date")).options
                    print("Options 3 : {}".format(options3[k].text))
                    ele_dates=options3[k].text
                    options3[k].click()
                    driver.find_element_by_xpath("//input[@name='submit']").click()
                    time.sleep(1)
            except:
                pass
    except:
        driver.get('http://wbsec.gov.in/results/panchayat_election_detailed_result?election_year=2013')
        driver.find_element_by_id("search_type_ps").click()

driver.quit()