Question

在我的Ubuntu机器上使用PhantomJS和Selenium的所有安装先决条件，我在代码片段下面运行：

from selenium import webdriver

driver = webdriver.PhantomJS()
driver.set_window_size(1120, 550)
driver.get("https://duckduckgo.com/")
driver.find_element_by_id('search_form_input_homepage').send_keys("realpython")
driver.find_element_by_id("search_button_homepage").click()
print driver.current_url
driver.quit()

执行时我得到以下错误：

$ python duck.py 
Traceback (most recent call last):
  File "duck.py", line 5, in <module>
    driver.find_element_by_id('search_form_input_homepage').send_keys("realpython")
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 208, in find_element_by_id
    return self.find_element(by=By.ID, value=id_)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 664, in find_element
    {'using': by, 'value': value})['value']
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 175, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 166, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: Error Message => 'Unable to find element with id 'search_form_input_homepage''
 caused by Request => {"headers":{"Accept":"application/json","Accept-Encoding":"identity","Connection":"close","Content-Length":"107","Content-Type":"application/json;charset=UTF-8","Host":"127.0.0.1:50789","User-Agent":"Python-urllib/2.7"},"httpVersion":"1.1","method":"POST","post":"{\"using\": \"id\", \"sessionId\": \"26560250-fec9-11e4-b2ee-2dada5838664\", \"value\": \"search_form_input_homepage\"}","url":"/element","urlParsed":{"anchor":"","query":"","file":"element","directory":"/","path":"/element","relative":"/element","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/element","queryKey":{},"chunks":["element"]},"urlOriginal":"/session/26560250-fec9-11e4-b2ee-2dada5838664/element"}
Screenshot: available via screen

Answer 1

设置--ssl-protocol=any service argument并使用Explicit Waits使其对我有用：

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


driver = webdriver.PhantomJS(service_args=['--ssl-protocol=any'])

driver.maximize_window()
driver.get("https://duckduckgo.com/")

wait = WebDriverWait(driver, 10)
search = wait.until(EC.presence_of_element_located((By.ID, "search_form_input_homepage")))
search.send_keys("realpython")
driver.find_element_by_id("search_button_homepage").click()

print driver.current_url
driver.quit()

打印https://duckduckgo.com/?q=realpython。

请注意，没有--ssl-protocol=any PhantomJS甚至没有加载页面，当前网址仍为about:blank。

Answer 2

我认为发生在你身上的是你试图找到一个尚未在页面上加载的元素。因此，我建议您在尝试输入搜索字段之前插入WaitForElementDisplayed(by.ID("search_form_input_homepage"));。因此，在尝试与之交互之前，您将确保该元素存在。

我无法给你一个代码示例，因为我并不熟悉Python绑定。

执行PhantomJS + Selenium Webdriver + Python程序时出现异常

2 个答案: