预期的硒条件 [英] Expected conditions with selenium

问题描述

如何使用预期条件检查HTML中是否存在 br 标记。这是HTML代码：

 < br> 
< a href =member.php？u = 12455 =nofollow> Smatta< / a> 
< a>，< / a> 
< a href =member.php？u = 14305 =nofollow> Nyunyu< / a> 
< a>，< / a> 
< a href =member.php？u = 20892 =nofollow> moyo< / a> 
< a>，< / a> 
< a href =member.php？u = 21040 =nofollow> Masikini_Jeuri< / a> 
< a>，< / a> 
< a href =member.php？u = 27429 =nofollow>作业K< / a> 
< a>，< / a> 
< a href =member.php？u = 38124 =nofollow> Adoe< / a> 
< a>，< / a> 
< a href =member.php？u = 39196 =nofollow> enhe< / a> 
< a>< / a> 
  

这是我的代码。

<$ p $ （$ .C $ c $> wait = WebDriverWait（browser，10）
wait.until（EC.visibility_of_element_located（（By.XPATH，'//< br>）））

完整的代码。

 从selenium导入webdriver 
来自selenium.webdriver.common.by导入通过selenium.webdriver.support.ui获取
从selenium.webdriver.support导入WebDriverWait 
导入expected_conditions作为EC 
 
 browser = webdriver.PhantomJS（）
 browser.maximize_window（）
 browser.get（http://www.jamiiforums.com/kenyan-news/225589-kenyan-and-tanzanian ）
 
 username = browser.find_element_by_id（navbar_username）
 password = browser.find_element_by_name（vb_login_password_hint）
 
 username.send_keys（ （button）。
 password.send_keys（ 20）
 wait.unti （EC.visibility_of_element_located（（By.XPATH，'// h2 [contains（。，Redirecting）]'）））
 wait.until（EC.title_contains（'Kenyan&坦桑尼亚'））
 wait.until（EC.visibility_of_element_located（（By.ID，'postlist'）））
 
 browser.find_element_by_xpath（'// div [@ class =vbseo_liked ] / a [contains（@onclick，return vbseoui.others_click（this））]'）
 browser.find_element_by_class_name（vbseo_liked）。click（）
 
 wait.until EC.visibility_of_element_located（（By.TAG_NAME，'br'）））
 print（browser.page_source）
 
 print'success !!'
 browser.close（）
  

我这样做的原因是因为br标签只在链接被点击后出现。我试图在点击操作后获取页面源代码，但它在点击操作之前给了我页面源代码。我想在获取页面源代码之前检查br标签的存在。

这是打印出的错误。

在
wait.until（EC.visibility_of_element_located（（By.TAG_NAME，'br'）））

解决方案

这只是说您的XPath表达式不正确，应该是：

  // br 
  

或者，您可以使用标记名称定位器：

  wait.until（EC.visibility_of_element_located（（By.TAG_NAME，'br'）） ））
  

---

请注意，我是不确定你的意图是什么，但是我从来没有看到过有人会在测试自动化或网页抓取中依赖 br 标签。这并不意味着你做错了什么，但要确保有一个坚实的理由。

How do i check if a br tag is present in HTML using expected conditions. This is the HTML code:

<br>
<a href="member.php?u=12455" rel="nofollow">Smatta</a>
<a>, </a>
<a href="member.php?u=14305" rel="nofollow">Nyunyu</a>
<a>, </a>
<a href="member.php?u=20892" rel="nofollow">moyo</a>
<a>, </a>
<a href="member.php?u=21040" rel="nofollow">Masikini_Jeuri</a>
<a>, </a>
<a href="member.php?u=27429" rel="nofollow">Job K</a>
<a>, </a>
<a href="member.php?u=38124" rel="nofollow">Adoe</a>
<a>, </a>
<a href="member.php?u=39196" rel="nofollow">enhe</a>
<a></a>

This is my code.

wait = WebDriverWait(browser, 10)
wait.until(EC.visibility_of_element_located((By.XPATH, '//<br>')))

Full code.

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

browser = webdriver.PhantomJS()
browser.maximize_window()
browser.get("http://www.jamiiforums.com/kenyan-news/225589-kenyan-and-tanzanian-surburbs.html")

username = browser.find_element_by_id("navbar_username")
password = browser.find_element_by_name("vb_login_password_hint")

username.send_keys("MarioP")
password.send_keys("codeswitching")

browser.find_element_by_class_name("loginbutton").click()

wait = WebDriverWait(browser, 20)
wait.until(EC.visibility_of_element_located((By.XPATH, '//h2[contains(., "Redirecting")]')))
wait.until(EC.title_contains('Kenyan & Tanzanian'))
wait.until(EC.visibility_of_element_located((By.ID, 'postlist')))

browser.find_element_by_xpath('//div[@class="vbseo_liked"]/a[contains(@onclick, "return vbseoui.others_click(this)")]')
browser.find_element_by_class_name("vbseo_liked").click()

wait.until(EC.visibility_of_element_located((By.TAG_NAME, 'br')))
print (browser.page_source)

print 'success!!'
browser.close()

The reason I am doing that is because the br tag only appears after a link has been clicked. I am trying to get the page source after the click action, but it gives me the page source before the click action. I wanted to check the presence of the br tag before i get the page source.

This is the error it prints out.

File "sele.py", line 29, in wait.until(EC.visibility_of_element_located((By.TAG_NAME, 'br')))

解决方案

It's just that your XPath expression is incorrect, should be:

//br

Or, you can use the "tag name" locator:

wait.until(EC.visibility_of_element_located((By.TAG_NAME, 'br')))

---

As a side note, I'm not sure what your intentions are, but I've never seen a case where someone would rely on a presence of a br tag in test automation or web-scraping. It doesn't necessarily mean you are doing something wrong, but make sure there is a solid reason for that.

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