javascript 如何从路径而不是类或 ID 中获取元素
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How to Get Element From Path Not Class or Id
提问by Phish
I am struggling to find an answer for this, I want a way to talk about an element, but because of the system I am adding to I do can not reference by its Id as it is dynamic. I can specify the class name of its containing div though... In essence what I am looking for is something along the lines of:
我正在努力为此找到答案，我想要一种谈论元素的方法，但是由于我添加的系统，我无法通过其 Id 进行引用，因为它是动态的。我可以指定其包含的 div 的类名......本质上我正在寻找的是类似的东西：
var disAb=document.getElementBySomething("div.ContainerDiv select")
When I mention the term 'path' I mean how I would reference it in CSS (see code reference).
当我提到术语“路径”时，我的意思是我将如何在 CSS 中引用它（参见代码参考）。
Thank you guys!
感谢你们！
回答by Patrick Evans
You want document.querySelectoror document.querySelectorAll, then just reference it by its hierarchy path:
您想要document.querySelectoror document.querySelectorAll，然后只需通过其层次结构路径引用它：
Sample HTML
示例 HTML
<div class="ContainerDiv">
<table>
<tr>
<td>
<div>
<select>
<option>Some options</option>
</select>
</div>
</td>
</tr>
</table>
</div>
JS
JS
Get single element
获取单个元素
var select=document.querySelector("div.ContainerDiv table tr td div select");
select.id = "someid";
For more than one element
对于多个元素
var selects=document.querySelectorAll("div.ContainerDiv select");
selects[0].id = "someid";
Of course you do not need each part of the hiearchy, for instance you could just use: div.ContainerDiv selector div.ContainerDiv table selectetc.
当然，您不需要层次结构的每个部分，例如您可以只使用：div.ContainerDiv select或div.ContainerDiv table select等。
