Selenium No Element Found Exception 即使在从源代码复制元素后

Question

我正在尝试简单地登录到此页面以访问 LexisNexis。这是我的代码：

from selenium import webdriver
browser = webdriver.Firefox(executable_path='/usr/local/bin/geckodriver')
type(browser)

browser.get('https://sfx.carli.illinois.edu/sfxuiu?url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&ctx_enc=info:ofi/enc:UTF-8&ctx_ver=Z39.88-2004&rfr_id=info:sid/sfxit.com:azlist&sfx.ignore_date_threshold=1&rft.object_id=63750000000001351&svc.fulltext=yes')
linkElem2 = browser.find_element_by_link_text('LEXIS NEXIS DATABASES') 
type(linkElem2)
linkElem2.click()
alert = browser.switch_to.alert
alert.accept()

loginElem = browser.find_element_by_id('j_username')
loginElem.send_keys('username')
passElem = browser.find_element_by_id('j_password')
passElem.send_keys('password')
passElem.submit()

这里是html源代码：

div class="form_row" 标签为 =“j_username” 输入你的 strongNetID:/strong/label 输入 id="j_username" name="j_username" autocomplete="OFF" autocapitalize="off" autocorrect="off" value="" type="text" /div

我不确定我做错了什么：/

Answer 1

1.问题 “LEXIS NEXIS DATABASES”链接打开新窗口，您必须切换到它才能登录，Handle multiple windows in Python：

from selenium import webdriver

browser = webdriver.Firefox(executable_path='/usr/local/bin/geckodriver')
browser.implicitly_wait(5)

browser.get('https://sfx.carli.illinois.edu/sfxuiu?url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&ctx_enc=info:ofi/enc:UTF-8&ctx_ver=Z39.88-2004&rfr_id=info:sid/sfxit.com:azlist&sfx.ignore_date_threshold=1&rft.object_id=63750000000001351&svc.fulltext=yes')
browser.find_element_by_link_text('LEXIS NEXIS DATABASES').click()

browser.close()
browser.switch_to.window(browser.window_handles[0])

browser.find_element_by_id('j_username').send_keys('username')
passElem = browser.find_element_by_id('j_password')
passElem.send_keys('password')
passElem.submit()

2。问题 Link您在cmets 中分享的第一次打开时出现错误（新的浏览器配置文件）。 您只需打开page 并单击“使用您的伊利诺伊州网络ID 登录”即可成功打开登录页面。这种方式好多了，因为你不需要处理windows，检查下面的代码：

from selenium import webdriver

browser = webdriver.Firefox(executable_path='/usr/local/bin/geckodriver')
browser.implicitly_wait(5)

browser.get('https://compass2g.illinois.edu/webapps/login/')
browser.find_element_by_link_text('Login with your Illinois NetID').click()

browser.implicitly_wait(5)

browser.find_element_by_id('j_username').send_keys('username')
passElem = browser.find_element_by_id('j_password')
passElem.send_keys('password')
passElem.submit()

Answer 2

单击该链接会打开一个新选项卡，因此您需要先切换到新选项卡，然后才能找到用户名和密码字段。试试这个（缩进可能被破坏）：

from selenium import webdriver
import time
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
browser = webdriver.Firefox(executable_path='/usr/local/bin/geckodriver')
browser.get('https://sfx.carli.illinois.edu/sfxuiu?url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&ctx_enc=info:ofi/enc:UTF-8&ctx_ver=Z39.88-2004&rfr_id=info:sid/sfxit.com:azlist&sfx.ignore_date_threshold=1&rft.object_id=63750000000001351&svc.fulltext=yes')
linkElem2 = browser.find_element_by_link_text('LEXIS NEXIS DATABASES') 
linkElem2.click()
alert = browser.switch_to.alert  
alert.accept()
time.sleep(5) #to add 5 sec wait, you can use other wait methods for window handle. e.g. https://stackoverflow.com/questions/26641779/python-selenium-how-to-wait-for-new-window-opens
browser.switch_to.window(browser.window_handles[1])
WebDriverWait(browser, 10).until(EC.presence_of_element_located((By.ID, 'j_username')))
loginElem = browser.find_element_by_id('j_username')
loginElem.send_keys('username')
passElem = browser.find_element_by_id('j_password')
passElem.send_keys('password')
passElem.submit()

您将需要以下导入

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