如何find_element_by_link_text有：NoSuchElement异常？ [英] How to find_element_by_link_text while having: NoSuchElement Exception?

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本文介绍了如何find_element_by_link_text有：NoSuchElement异常？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

这个问题一再被问过 - 尽管尝试了所有的黑客，我仍然看不出什么问题。



我试图将implicitly_wait增加到30（甚至将其增加到100） - 但它不工作。



case - ：我正在尝试创建一个列表，将填充页面中的所有项目这里，作为一个基础案例 - 我打算绑定到一个小模块，我已经与scrapy有所有（页面具有类似的Web元素）爬网链接 - 因此本质上将

  ###我的源代码 - 通过Selenium IDE生成，导出到一个Python webdriver并操作一点后### 
 
从selenium import webdriver 
从selenium.webdriver.common.by导入由
从selenium.webdriver.support.ui import从selenium.common.exceptions中选择
 import NoSuchElementException 
 from selenium.webdriver.support.wait import WebDriverWait 
 import unittest，time，re 
 
 class Einstein .testCase）：
 def setUp（self）：
 self.driver = webdriver.Firefox（）
 self.driver.implicitly_wait（30）
 self.base_url =http： //shopap.lenovo.com/in/en/laptops/
 self.verificationErrors = [] 
 self.accept_next_alert = True 
 
 def test_einstein（self）：
 driver = self.driver 
 driver.get（self.base_url）
 print driver.title 
 driver.find_element_by_link_text（T430）。click（）
打印驱动程序。 title 
＃driver.find_element_by_xpath（id（'facetedBrowseWrapper'）/ div / div / div [1] / div [2] / ul [1] / li [1] / a）。 b $ b driver.find_element_by_xpath（// div [@ id ='subseries'] / div [2] / div / p [3] / a。）click（）
 print driver.title 
＃driver.find_element_by_xpath（// div [@ id ='subseries'] / div [2] / div / p [3] / a）click（）
 try：self.assertEqual边缘E530（黑色），driver.find_element_by_link_text（Thinkpad Edge E530（黑色）））文本）
除了AssertionError as e：self.verificationErrors.append（str（e））
＃到这里
  





 ＃**这里的代码失败**＃
 laptop1 = driver.find_element_by_link_text（Thinkpad Edge E530（Black））。text 
 print laptop1 
 price1 = driver.find_element_by_css_selector .price）。text 
 print price1 
 detail1 = self.is_element_present（By.CSS_SELECTOR，div.desc.std）
 print detail1 
 
 def is_element_present （self，how，what）：
 try：self.driver.find_element（by = how，value = what）
除了NoSuchElementException，e：return False 
 return True 
 b $ b def is_alert_present（self）：
 try：self.driver.switch_to_alert（）
除了NoAlertPresentException，e：return False 
 return True 
 
 def close_alert_and_get_its_text self）：
 try：
 alert = self.driver.switch_to_alert（）
 alert_text = alert.text 
 if self.accept_next_alert：
 alert.accept（）
 else：
 alert.dismiss（）
 return alert_text 
 finally：self.accept_next_alert = True 
 
 def tearDown（self）：
 self .driver.quit（）
 self.assertEqual（[]，self.verificationErrors）
 
如果__name__ ==__main__：
 unittest.main（）
 
 
错误&输出：
 ekta @ ekta-VirtualBox：〜$ python einstein.py 
笔记本电脑&超极本|联想（IN）
 ThinkPad T430笔记本电脑商业计算|联想（IN）
购买Lenovo ThinkPad笔记本电脑|联想ThinkPad笔记本电脑价格印度
 E 
 ================================== ============================== 
错误：test_einstein（__main __。爱因斯坦）
 -------------------------------------------------- -------------------- 
 Traceback（最近一次调用）：
文件einstein.py，第27行，在test_einstein 
 try：self.assertEqual（Thinkpad Edge E530（Black），driver.find_element_by_link_text（Thinkpad Edge E530（Black））。文本）
文件/usr/local/lib/python2.7/ dist-packages / selenium / webdriver / remote / webdriver.py，行246，在find_element_by_link_text 
中返回self.find_element（by = By.LINK_TEXT，value = link_text）
文件/ usr / local / lib / python2.7 / dist-packages / selenium / webdriver / remote / webdriver.py，行680，在find_element 
 {'using'：by，'value'：value}）['value'] 
文件/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py，第165行，在执行
 self.error_handler.check_response（response）
文件/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py，第158行，在check_response 
中raise exception_class（message，screen，stacktrace）
 NoSuchElementException：Message：u'Unable to locate element：{method：link text，selector：Thinkpad Edge E530（Black）} Stacktrace：
在FirefoxDriver.prototype.findElementInternal_（file：///tmp/tmphli5Jg/extensions/fxdriver@googlecode.com/components/driver_component.js：8444）
 at fxdriver.Timer.prototype.setTimeout /<.notify（file：///tmp/tmphli5Jg/extensions/fxdriver@googlecode.com/components/driver_component.js：386）
 
 ----------- -------------------------------------------------- --------- 
在79.348s中执行1个测试
 
 FAILED（errors = 1）

问题&

如果您回答这个问题，请说明为什么这个特定的find_element_by_link_text无法使用。


  • （非常基本）在我的selenium IDE的GUI - >显示所有可用的命令 - 为什么我看不到css（find_element_by_css_selector） - 是否有一种方法可强制将元素读取为CSS选择器？


  • 请提供是否会以一致的方式抓取元素（1）


  • 请确认工作以捕获异常并移动即使在尝试验证，断言循环后，我仍然无法获取这个find_element_by_link_text


  • 我尝试使用Xpath构建这个元素在视图中的Xpath（在firefox中） - 我什么也看不到，为什么会发生这样的事情（当然我删除了命名空间：x）


    • 其他我尝试除了 implicity_wait（30）：

      find_element_by_partial_link（Thinkpad）并附加Unicode到这里（不确定是否正在阅读括号（，driver.find_element_by_link_text（uThinkpad Edge E530（黑色） 。





    相关问题：




    解决方案

    在我之前， find_element_by_link_text 方法有时工作，有时不工作;即使在单个案例中。我认为这不是一个可靠的方式来访问元素;最好的方法是使用 find_element_by_id 。



    但是在你的情况下，当我访问该页面时，没有id可以帮助你。仍然可以通过三种方式尝试 find_elements_by_xpath ：



    1-访问标题： find_element_by_xpath [ // a [contains（@title ='T430'）]]



    2-访问文本： find_element_by_xpath [// a [contains（text（），'T430'）]]



    3-访问href： find_element_by_xpath [// a [contains（@href ='http://www.thedostore.com/laptops/thinkpad-laptops/thinkpad-t430-u-black-627326q.html')]\"]。



    希望它有帮助。


    This question has been asked over and over again - and in-spite of trying all the hacks I still can't seem to figure out what's wrong.

    I tried increasing the implicitly_wait to 30 (and even increased it upto 100) - yet it did not work.

    Use case -: I am trying to create a list that wil populate all the items in the page here, as a base case - and I intend to bind this to a mini-module that I already have with scrapy which has all (pages with similar web elements) crawled links - so essentially will be building the whole pipeline, post I am done with this.

    ###My source code - generated via Selenium IDE, exported to a Python webdriver and manipulated a little later ###

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.support.wait import WebDriverWait
import unittest, time, re

class Einstein(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Firefox()
        self.driver.implicitly_wait(30)
        self.base_url = "http://shopap.lenovo.com/in/en/laptops/"
        self.verificationErrors = []
        self.accept_next_alert = True

    def test_einstein(self):
        driver = self.driver
        driver.get(self.base_url)
        print driver.title
        driver.find_element_by_link_text("T430").click()
        print driver.title
#       driver.find_element_by_xpath("id('facetedBrowseWrapper')/div/div/div[1]/div[2]/ul[1]/li[1]/a").click()
        driver.find_element_by_xpath("//div[@id='subseries']/div[2]/div/p[3]/a").click()
        print driver.title
       # driver.find_element_by_xpath("//div[@id='subseries']/div[2]/div/p[3]/a").click()
        try: self.assertEqual("Thinkpad Edge E530 (Black)", driver.find_element_by_link_text("Thinkpad Edge E530 (Black)").text)
        except AssertionError as e: self.verificationErrors.append(str(e))
       # Everything ok till here


            #**THE CODE FAILS HERE**#
        laptop1 = driver.find_element_by_link_text("Thinkpad Edge E530 (Black)").text
        print laptop1
        price1 = driver.find_element_by_css_selector("span.price").text
        print price1
        detail1 = self.is_element_present(By.CSS_SELECTOR, "div.desc.std")
        print detail1

            def is_element_present(self, how, what):
        try: self.driver.find_element(by=how, value=what)
        except NoSuchElementException, e: return False
        return True

    def is_alert_present(self):
        try: self.driver.switch_to_alert()
        except NoAlertPresentException, e: return False
        return True

    def close_alert_and_get_its_text(self):
        try:
            alert = self.driver.switch_to_alert()
            alert_text = alert.text
            if self.accept_next_alert:
                alert.accept()
            else:
                alert.dismiss()
            return alert_text
        finally: self.accept_next_alert = True

    def tearDown(self):
        self.driver.quit()
        self.assertEqual([], self.verificationErrors)

if __name__ == "__main__":
    unittest.main()


Errors & output :
ekta@ekta-VirtualBox:~$ python einstein.py
Laptops & Ultrabooks | Lenovo (IN)
ThinkPad T430 Laptop PC for Business Computing | Lenovo (IN)
Buy Lenovo Thinkpad Laptops | Lenovo Thinkpad Laptops Price India
E
======================================================================
ERROR: test_einstein (__main__.Einstein)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "einstein.py", line 27, in test_einstein
    try: self.assertEqual("Thinkpad Edge E530 (Black)", driver.find_element_by_link_text("Thinkpad Edge E530 (Black)").text)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 246, in find_element_by_link_text
    return self.find_element(by=By.LINK_TEXT, value=link_text)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 680, in find_element
    {'using': by, 'value': value})['value']
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 165, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 158, in check_response
    raise exception_class(message, screen, stacktrace)
NoSuchElementException: Message: u'Unable to locate element: {"method":"link text","selector":"Thinkpad Edge E530 (Black)"}' ; Stacktrace: 
    at FirefoxDriver.prototype.findElementInternal_ (file:///tmp/tmphli5Jg/extensions/fxdriver@googlecode.com/components/driver_component.js:8444)
    at fxdriver.Timer.prototype.setTimeout/<.notify (file:///tmp/tmphli5Jg/extensions/fxdriver@googlecode.com/components/driver_component.js:386) 

----------------------------------------------------------------------
Ran 1 test in 79.348s

FAILED (errors=1)

    Questions & comments:

    1. If you are answering this question - please mention why this specific "find_element_by_link_text" does not work.

    2. (Very Basic) In the GUI of my selenium IDE -> Show all available commands - why dont I see the css (find_element_by_css_selector) for all the web elements - is there a way to force feed an element to be read as a CSS selector ?

    3. In case you suggest using some other locator - please mention if that will be consistent way to fetch elements, given (1)

    4. Does assert work to capture the exceptions and "move on" - since even after trying "verify" , "assert" loops, I still cant fetch this "find_element_by_link_text"

    5. I tried using Xpath to build this "element" , but in the view Xpath (in firefox) - I see nothing, to clue why that happens (Of course I removed the namespace ":x" )

    Other things I tried apart from implicity_wait(30):

    find_element_by_partial_link("Thinkpad") and appending Unicode to this (wasn’t sure if it was reading the brackets ( , driver.find_element_by_link_text(u"Thinkpad Edge E530 (Black)").text, still did not work.

    Related questions:

    解决方案

    It happened to me before that the find_element_by_link_text method sometimes works and sometimes doesn't work; even in a single case. I think it's not a reliable way to access elements; the best way is to use find_element_by_id.

    But in your case, as I visit the page, there is no id to help you. Still you can try find_elements_by_xpath in 3 ways:

    1- Accessing title: find_element_by_xpath["//a[contains(@title = 'T430')]"]

    2- Accessing text: find_element_by_xpath["//a[contains(text(), 'T430')]"]

    3- Accessing href: find_element_by_xpath["//a[contains(@href = 'http://www.thedostore.com/laptops/thinkpad-laptops/thinkpad-t430-u-black-627326q.html')]"].

    Hope it helps.

    这篇关于如何find_element_by_link_text有：NoSuchElement异常？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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