访问shadow DOM中的元素 [英] Accessing elements in the shadow DOM

问题描述

是否可以使用python-selenium 在Shadow DOM 中查找元素？

Is it possible to find elements inside the Shadow DOM with python-selenium?

示例用例：

我有输入， type =date：

<input type="date">

我想点击日期选择按钮在右侧并从日历中选择日期。

And I'd like to click the date picker button on the right and choose a date from the calendar.

如果您要检查Chrome开发者工具中的元素并展开日期输入的影子根节点，你会看到按钮显示为：

If you would inspect the element in Chrome Developer Tools and expand the shadow-root node of the date input, you would see the button is appearing as:

<div pseudo="-webkit-calendar-picker-indicator" id="picker"></div>

屏幕截图演示它在Chrome中的外观：

Screenshot demonstrating how it looks in Chrome:

查找选择器按ID按钮结果 NoSuchElementException ：

Finding the "picker" button by id results into NoSuchElementException:

>>> date_input = driver.find_element_by_name('bday')
>>> date_input.find_element_by_id('picker')
...
selenium.common.exceptions.NoSuchElementException: Message: no such element

我还尝试使用 :: shadow 和 / deep / 此处建议的定位器：

I've also tried to use ::shadow and /deep/ locators as suggested here:

>>> driver.find_element_by_css_selector('input[name=bday]::shadow #picker')
...
selenium.common.exceptions.NoSuchElementException: Message: no such element
>>>
>>> driver.find_element_by_css_selector('input[name=bday] /deep/ #picker')
...
selenium.common.exceptions.NoSuchElementException: Message: no such element

---

请注意，我可以通过向其发送密钥来更改输入中的日期：

---

Note that I can change the date in the input by sending keys to it:

driver.find_element_by_name('bday').send_keys('01/11/2014')

但是，我想通过从日历中选择日期来具体设置日期。

But, I want to set the date specifically by choosing it from a calendar.

推荐答案

无法访问本机HTML 5元素的影子根。

There's no way to access the shadow root of native HTML 5 elements.

在这种情况下没用，但使用Chrome可以访问自定义创建的影子根：

Not useful in this case, but with Chrome it's possible to access a custom created shadow root:

var root = document.querySelector("#test_button").createShadowRoot();
root.innerHTML = "<button id='inner_button'>Button in button</button"

<button id="test_button"></button>

然后可以通过以下方式访问root：

The root can then be accessed this way:

 var element = document.querySelector("#test_button").shadowRoot;

如果你想用selenium python（chromedriver版本2.14+）自动点击内部按钮：

If you want to automate a click on the inner button with selenium python (chromedriver version 2.14+):

 >>> outer = driver.execute_script('return document.querySelector("#test_button").shadowRoot')
 >>> inner = outer.find_element_by_id("inner_button")
 >>> inner.click()

2015年6月9日更新

这是github上当前Shadow DOM W3C编辑器草案的链接：

This is the link to the current Shadow DOM W3C Editor's draft on github:

http://w3c.github.io/webcomponents/spec/shadow/

如果您有兴趣浏览闪烁源代码，这是一个很好的起点。

If you're interested in browsing the blink source code, this is a good starting point.

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