硒页面源缺少元素 [英] Selenium Page Source is Missing Elements

问题描述

我有一个基本的Selenium脚本，它使用了chromedriver二进制文件。我正在尝试显示一个上面带有Recaptcha的页面，然后挂起，直到答案完成，然后将其存储在变量中以备将来使用。

I have a basic Selenium script that makes use of the chromedriver binary. I'm trying to display a page with recaptcha on it and then hang until the answer has been completed and then store that in a variable for future use.

我遇到的障碍是我找不到Recaptcha元素。

The roadblock I'm hitting is that I am unable to find the recaptcha element.

#!/bin/env python2.7
import os
from selenium import webdriver

driverBin=os.path.expanduser("~/Desktop/chromedriver")
driver=webdriver.Chrome(driverBin)
driver.implicitly_wait(5)
driver.get('http://patrickhlauke.github.io/recaptcha/')

可以看到此元素吗？

还有没有办法在用户解决后获取令牌而不刷新页面？

Also is there a way to grab the token after user solve without refreshing the page?

现在，隐藏密码令牌ID的输入类型被隐藏了。解决后，将创建第二个Recaptcha令牌ID。这是我希望存储在变量中的值。我当时正在考虑使用该ID循环检查找到的元素的长度。如果大于1，则解析。但我不确定来源本身是否会更新。

As it is now the input type of the recaptcha-token id is hidden. After solve a second recaptcha-token id is created. This is the value I wish to store in a variable. I was thinking of having a loop of checking length of found elements with that id. If greater than 1 parse. But I'm unsure whether the source updates per se.

更新：

随着更多的研究，它与元素的性质有关，尤其是：与标记：<输入类型= hidden 。因此，我想改写我的问题，一个人如何提取隐藏元素的值。

With more research it has to do with the nature of the element, particularly: with the tag: <input type="hidden". So I guess to rephrase my question, how does one extract the value of a hidden element.

推荐答案

您正在寻找的元素（输入）在iframe中。在定位元素并与之交互之前，您需要切换到iframe。

The element you are looking for (the input) is in an iframe. You'll need switch to the iframe before you can locate the element and interact with it.

import os
from selenium import webdriver

driver=webdriver.Chrome()
try:
    driver.implicitly_wait(5)
    driver.get('http://patrickhlauke.github.io/recaptcha/')

    # Find the iframe and switch to it
    iframe_path = '//iframe[@title="recaptcha widget"]'
    iframe = driver.find_element_by_xpath(iframe_path)
    driver.switch_to.frame(iframe)

    # Find the input element
    input_elem = driver.find_element_by_id("recaptcha-token")

    print("Found the input element: ", input_elem)

finally:
    driver.quit()

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