在Selenium/PhantomJS上执行Javascript [英] Executing Javascript on Selenium/PhantomJS

问题描述

我正在通过Python中的Selenium Webdriver使用PhantomJS，并且我试图在页面上执行一段JavaScript，希望返回一段数据:

I'm using PhantomJS via Selenium Webdriver in Python and I'm trying to execute a piece of JavaScript on the page in hopes of returning a piece of data:

from selenium import webdriver

driver = webdriver.PhantomJS("phantomjs.cmd") # or add to your PATH
driver.set_window_size(1024, 768) # optional
driver.get('http://google.com') # EXAMPLE, not actual URL

driver.save_screenshot('screen.png') # save a screenshot to disk
jsres = driver.execute('$("#list").DataTable().data()')
print(jsres)

但是，在运行时，它会报告KeyError.我找不到有关可用命令的大量文档，所以这里有些卡住了.

However when run, it reports KeyError. I was unable to find much documentation on the commands available, so I'm a bit stuck here.

推荐答案

为执行JavaScript而创建的方法称为

The method created for executing javascript is called execute_script(), not execute():

driver.execute_script('return $("#list").DataTable().data();')

仅供参考，execute()在内部用于发送Webdriver命令.

FYI, execute() is used internally for sending webdriver commands.

请注意，如果您希望JavaScript代码返回某些内容，则需要使用return.

Note that if you want something returned by javascript code, you need to use return.

还请注意，这可能会引发Can't find variable: $错误消息.在这种情况下，用selenium找到元素并将其传递到脚本中:

Also note that this can throw Can't find variable: $ error message. In this case, locate the element with selenium and pass it into the script:

# explicitly wait for the element to become present
wait = WebDriverWait(driver, 10)
element = wait.until(EC.presence_of_element_located((By.ID, "list")))

# pass the found element into the script
jsres = driver.execute_script('return arguments[0].DataTable().data();', element)
print(jsres)

这篇关于在Selenium/PhantomJS上执行Javascript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！