CSS伪选择器以选择querySelector中的当前元素? [英] CSS pseudo-selector to select the current element within querySelector?

问题描述

选择元素自身的CSS伪选择器是什么?

What's the CSS pseudo-selector to select an element's self?

例如，这不起作用:

Array.prototype.map.call(document.querySelectorAll('.program_record_outer'), programBox => {
    return programBox.querySelector('> div')
});

DOMException:无法在'Element'上执行'querySelector':'> div'不是有效的选择器.

DOMException: Failed to execute 'querySelector' on 'Element': '> div' is not a valid selector.

但是我相信这样会:

Array.prototype.map.call(document.querySelectorAll('.program_record_outer'), programBox => {
    return programBox.querySelector(':self > div')
});

但是，:self不是东西，:root是指文档根目录，那么如何指代当前上下文?

However, :self isn't a thing, and :root refers to the document root, so how do I refer to the current context?

推荐答案

在某些最新的浏览器中(

In some of the latest browsers (Chrome, Firefox 32+, Opera 15+, and Safari 7.0+) you can use the :scope selector in calls to querySelector and querySelectorAll:

let result = [...document.querySelectorAll('.program_record_outer')].map(
  programBox => programBox.querySelector(':scope > div')
)

console.log(result)

<div class="program_record_outer">
  <div>1</div>
</div>
<div class="program_record_outer">
  <div>2</div>
</div>
<div class="program_record_outer">
  <div>3</div>
</div>

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