适用于具有两个类的元素的 CSS 选择器 [英] CSS Selector that applies to elements with two classes

问题描述

有没有办法根据设置为两个特定类的 class 属性的值来选择带有 CSS 的元素.例如，假设我有 3 个 div:

Hello Foo
<div class="foo bar">Hello World</div><div class="bar">Hello Bar</div>

基于它是 foo 和 bar 类的成员这一事实，我可以编写什么 CSS 来仅选择列表中的第二个元素?

解决方案

链接两个类选择器(中间没有空格):

.foo.bar {/* 带有 foo 和 bar 类的元素的样式 */}

<小时>

如果您仍然需要处理像 IE6 这样的古老浏览器，请注意它不会正确读取链式类选择器:它只会读取 last 类选择器 (.bar 在这种情况下)，而不管您列出了哪些其他类.

为了说明其他浏览器和 IE6 如何解释这一点，请考虑以下 CSS:

* {颜色:黑色;}.foo.bar {红色;}

支持的浏览器上的输出是:

Hello Foo
<!-- 未选中，黑色文本 [1] --><div class="foo bar">Hello World</div><!-- 选中，红色文本 [2] --><div class="bar">Hello Bar</div><!-- 未选中，黑色文本 [3] -->

在 IE6 上的输出是:

Hello Foo
<!-- 未选中，黑色文本 [1] --><div class="foo bar">Hello World</div><!-- 选中，红色文本 [2] --><div class="bar">Hello Bar</div><!-- 选中，红色文本 [2] -->

脚注:

• 支持的浏览器:
  1. 未选中，因为该元素只有 foo 类.
  2. Selected 因为此元素同时具有 foo 和 bar 类.
  3. 未选中，因为该元素只有 bar 类.
     
     

• IE6:
  1. 未选中，因为该元素没有 bar 类.
  2. 已选择，因为此元素具有 bar 类，而不管列出的任何其他类.

Is there a way to select an element with CSS based on the value of the class attribute being set to two specific classes. For example, let's say I have 3 divs:

<div class="foo">Hello Foo</div>
<div class="foo bar">Hello World</div>
<div class="bar">Hello Bar</div>

What CSS could I write to select ONLY the second element in the list, based on the fact that it is a member of both the foo AND bar classes?

解决方案

Chain both class selectors (without a space in between):

.foo.bar {
    /* Styles for element(s) with foo AND bar classes */
}

---

If you still have to deal with ancient browsers like IE6, be aware that it doesn't read chained class selectors correctly: it'll only read the last class selector (.bar in this case) instead, regardless of what other classes you list.

To illustrate how other browsers and IE6 interpret this, consider this CSS:

* {
    color: black;
}

.foo.bar {
    color: red;
}

Output on supported browsers is:

<div class="foo">Hello Foo</div>       <!-- Not selected, black text [1] -->
<div class="foo bar">Hello World</div> <!-- Selected, red text [2] -->
<div class="bar">Hello Bar</div>       <!-- Not selected, black text [3] -->

Output on IE6 is:

<div class="foo">Hello Foo</div>       <!-- Not selected, black text [1] -->
<div class="foo bar">Hello World</div> <!-- Selected, red text [2] -->
<div class="bar">Hello Bar</div>       <!-- Selected, red text [2] -->

Footnotes:

• Supported browsers:
  1. Not selected as this element only has class foo.
  2. Selected as this element has both classes foo and bar.
  3. Not selected as this element only has class bar.
     
     

• IE6:
  1. Not selected as this element doesn't have class bar.
  2. Selected as this element has class bar, regardless of any other classes listed.

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