硒与pyvirtualdisplay无法找到元素

Question

我有一个工作脚本使用硒这样登录到一个网站：

script.py

from pyvirtualdisplay import Display 
from selenium import webdriver 

display = Display(visible=0, size=(1024, 768)) 
display.start() 

browser = webdriver.Firefox() 
actions = webdriver.ActionChains(browser) 
browser.get('some_url_I_need') 
content = browser.find_element_by_id('content') # Error on this line 

运行该脚本上亚马逊Ubuntu的盒子到ssh我在那里安装firefox的方式如下： sudo apt-get install firefox

我得到的错误是：

selenium.common.exceptions.NoSuchElementException：消息：u'Unable定位元件：{ “方法”： “ID”， “选择器”： “内容”}”

如果我运行通过ssh也在另一个Ubuntu的盒子上的脚本，它运行良好，没有错误，但我不知道如何在该框上安装Firefox，可能是该错误的原因。是相关的Firefox安装和如何正确安装它与pyvirtualdisplay和硒一起使用？

Answer 1

如果网站上有一些动态内容，您需要等待一段时间 ，直到您可以检索到希望的元素。尝试下面的代码示例：

检查配置

• 是否安装了pyvirtualdisplay像xvfb和xephyr后端？ 如果没有，

  尝试：sudo apt-get install xvfb xserver-xephyr

首先尝试：添加一个简单的time.sleep()

import time 
from pyvirtualdisplay import Display 
from selenium import webdriver 

display = Display(visible=0, size=(1024, 768)) 
display.start() 

browser = webdriver.Firefox() 
actions = webdriver.ActionChains(browser) 
browser.get('some_url_I_need') 
time.sleep(5) # sleep for 5 seconds 
content = browser.find_element_by_id('content') # Error on this line 

第二个尝试：添加browser.implicitly_wait(30)您硒的webdriver。

from pyvirtualdisplay import Display 
from selenium import webdriver 

display = Display(visible=0, size=(1024, 768)) 
display.start() 

browser = webdriver.Firefox() 
browser.implicitly_wait(30) # seconds 
actions = webdriver.ActionChains(browser) 
browser.get('some_url_I_need') 
content = browser.find_element_by_id('content') # Error on this line 

Answer 2

from pyvirtualdisplay import Display 

from selenium import webdriver 

from selenium.webdriver.common.by import By 

from selenium.webdriver.support.ui import Select 

from selenium.webdriver.common.desired_capabilities import DesiredCapabilities 

from selenium.common.exceptions import NoSuchElementException 

from selenium.common.exceptions import NoAlertPresentException 

from selenium.webdriver.common.keys import Keys 

import unittest, time, re, random 

capabilities = DesiredCapabilities.FIREFOX.copy() 

capabilities['marionette'] = False 

#display = Display(visible=0, size=(1024, 768)) 
#display.start() 

driver = webdriver.Firefox(capabilities=capabilities) 

driver.implicitly_wait(20) 

base_url = "http://xxx.yyy.zzz.aaa/sss/sss-Login/login/main_login.php" 

RANDINT = random.random()*10000 

verificationErrors = [] 

driver.get(base_url + "") 

username = driver.find_element_by_id("myusername") 

username.send_keys("xxxxxxxx") 

driver.implicitly_wait(20) 

password = driver.find_element_by_id("mypassword") 

#password.send_keys("xxxxzz" + Keys.ENTER) 

password.send_keys("xxxxzzc") 

driver.implicitly_wait(20) 

driver.find_element_by_xpath("//*[@id='submit']").click() 


# Click on category link 


driver.find_element_by_xpath("//*[@id='stylefour']/ul/li[3]/a").click() 

driver.find_element_by_xpath("//*[@id='stylefour']/ul/li[1]/a").click() 

driver.find_element_by_xpath("//*[@id='stylefour']/ul[2]/li[4]/a").click 

# Click on sub-category link 

driver.find_element_by_xpath("//*[@id='top']/body/div/div[2]/div[2]/div/div[2]/ul/li[4]/a/span").click() 

# Click on product image 

driver.find_element_by_xpath("//*[@id='product-collection-image-374']").click() 

# Click Checkout button 

driver.find_element_by_xpath("//*[@id='checkout-button']/span/span").click() 

driver.find_element_by_id("billing:firstname").clear() 

driver.find_element_by_id("billing:firstname").send_keys("selenium", RANDINT, "_fname") 

driver.find_element_by_id("billing:lastname").clear() 

driver.find_element_by_id("billing:lastname").send_keys("selenium", RANDINT, "_lname") 

# Click Place Order 

driver.find_element_by_xpath("//*[@id='order_submit_button']").click() 



driver.quit() 

display.stop()