StaleelementReference teception in Selenium的迭代中

Question

您好，我试图从以下页面中删除一些信息：http://verify.sos.ga.gov/verification/

我的代码如下：

import sys
reload(sys)
sys.setdefaultencoding('utf8')
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.ui import Select  
import time
import csv
url = 'http://verify.sos.ga.gov/verification/'
def init_Selenium():
    global driver
    driver = webdriver.Chrome("/Users/rodrigopeniche/Downloads/chromedriver")
    driver.get(url)
def select_profession():
    select = Select(driver.find_element_by_name('t_web_lookup__profession_name'))
    options = select.options
    for index in range(1, len(options) - 1):
        select = Select(driver.find_element_by_name('t_web_lookup__profession_name'))
        select.select_by_index(index)
        select_license_type()
def select_license_type():
    select = Select(driver.find_element_by_name('t_web_lookup__license_type_name'))
    options = select.options
    for index in range(1, len(options) - 1):
        select = Select(driver.find_element_by_name('t_web_lookup__license_type_name'))
        select.select_by_index(index)
        search_button = driver.find_element_by_id('sch_button')
        driver.execute_script('arguments[0].click();', search_button)
        scrap_licenses_results()
def scrap_licenses_results():
    table_rows = driver.find_elements_by_tag_name('tr')
    for index, row in enumerate(table_rows):
        if index < 9:
            continue
        else:
            attributes = row.find_elements_by_xpath('td')
            try:
                name = attributes[0].text
                license_number = attributes[1].text
                profession = attributes[2].text
                license_type = attributes[3].text
                status = attributes[4].text
                address = attributes[5].text
                license_details_page_link = attributes[0].find_element_by_id('datagrid_results__ctl3_name').get_attribute('href')
                driver.get(license_details_page_link)
                data_rows = driver.find_elements_by_class_name('rdata')
                issued_date = data_rows[len(data_rows) - 3].text
                expiration_date = data_rows[len(data_rows) - 2].text
                last_renewal_day = data_rows[len(data_rows) - 1].text
                print name, license_number, profession, license_type, status, address, issued_date, expiration_date, last_renewal_day
                driver.back()
            except:
                pass
init_Selenium()
select_profession()

当我执行脚本时，它适用于第一次迭代，但在第二个迭代中失败。 attributes = row.find_elements_by_xpath('td')行中的scrap_licenss_results((函数中引起错误的确切位置。

任何帮助将不胜感激

Answer 1

StaleElementReferenceException归因于循环迭代之前收集的行列表。最初，您创建了所有行的列表，名为table_rows。

 table_rows = driver.find_elements_by_tag_name('tr')

现在，在第一次迭代期间，您的第一行元素是新鲜的，可以由驾驶员找到。在第一次迭代结束时，您正在执行driver.back()，页面更改/刷新HTML DOM。现在所有先前收集的参考文献现在都丢失了。现在，您的table_rows列表中的所有行都是陈旧的。因此，在第二次迭代中，您正面临这样的例外。

您必须在循环中移动查找行操作，以便每次在目标应用程序上找到新的参考。psuedocode应执行这样的操作。

total_rows = driver.find_elements_by_tag_name('tr').length()
for i in total_rows
    driver.find_element_by_xpath('//tr[i]')
    .. further code..