是否有用于在 html 中选择元素的 css 选择器? [英] Is there a css selector for selecting an element futherup in the html?

问题描述

在下面的 HTML 中，我想在图像 img 悬停时对标题 h2 应用悬停效果.是否有一个 css 选择器可以做到这一点，或者其他方式?

In the following HTML, I want to apply a hover effect to the header h2, upon hover of the image img. Is there a css selector to do that, or another way?

HTML

  <article>
      <h2><a href="#">Title</a></h2>
      <a href="#"><img src="#" /></a>
  </article>

推荐答案

更新:主题说明符似乎已从 Selectors Level 4 规范的Editor's Draft，2014 年 5 月 6 日中删除.这使得使用 CSS 无法实现这一点.

Update: The subject specifier appears to have been removed from the Editor’s Draft, 6 May 2014 of the Selectors Level 4 specification. This leaves no way to achieve this using CSS.

选择器级别 4 引入了 主题说明符，它允许:

Selectors Level 4 introduces the subject specifier which allows:

!h2 + a img:hover { }

选择<h2>.

浏览器支持，AFAIK，目前不存在.

Browser support is, AFAIK, currently non-existent.

您可以在 JavaScript 中模拟它(以下内容未经测试，但应该会给您一些想法).

You can simulate it in JavaScript (the following is untested, but should give you the idea).

var img = document.querySelector('h2 + a img');
img.addEventListener('mouseover', function (e) {
    this.parentNode.previousElementSibling.className += " hovered";
});
img.addEventListener('mouseout', function (e) {
    this.parentNode.previousElementSibling.className = this.parentNode.previousElementSibling.className.replace(/shovered/g, "");
});

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