基于输入复选框状态应用CSS规则 [英] Applying CSS rules based on input checkbox status

问题描述

我目前正在开发一个网站，使用：checked变量来应用规则到CSS。我有一个复选框输入，触发时，应该完成两件事。它应该做的第一件事是扩展一个div从0到200的高度检查时，并返回到0，当未选中。我没有触发第一个任务的问题。 应该在检查盒子时完成的第二件事是：transform（45deg）of div with a + in which that should rotate 45 degrees into一个 x （不是实际的x，而是旋转的+）。

I'm currently developing a site that uses the :checked variable to apply rules to the CSS. I've got a checkbox input that when triggered, should accomplish two things. The first thing it should do is expand a div from a height of 0 to 200 when checked, and back to 0 when unchecked. I had no problems with triggering that first task. The second thing that should be accomplished upon checking the box, is a transform: rotate(45deg) of a div with a "+" in it that should rotate 45 degrees into an "x" (not an actual x, but a rotated +).

on：hover，但这只是为了说明的目的，这不会在我的最终代码。因此，将鼠标悬停在 + 上以查看我要使用：checked输入完成的操作。

I've currently got my code setup to display the animation on :hover, but that's just for illustrative purposes, that wouldn't be in my final code. So hover over the "+ to see what I'm trying to accomplish with the :checked input.

如果您愿意看看我的代码，告诉我我做错了，我会大大

If you're willing to take a look at my code, and tell me what I'm doing wrong, I'd be greatly appreciative! Let me know if you have any questions.

注意：理想情况下，我需要一个纯CSS解决方案，而不需要JS。让我知道

Here's my code pen.

推荐答案

有一天我写了一个类似的解决方案，此处。

I wrote a similar solution the other day, here.

基本上，您在使用：checked 方法时受到限制。您依赖于相邻和一般同胞组合器， + ， 〜 。

Basically, you are limited when using the :checked method. You are relying on the adjacent and general sibling combinators, +, ~. If the element isn't a general preceding sibling, it isn't going to work.

在这个例子中， .expand 不是前一个兄弟。因此，解决方案是将输入元素放在文档的根处，然后使用选择器 input [name ='panel']：checked 〜label .rotate 更改 .rotate 元素。注意，现在也使用一般的同级组合器〜，而不是相邻的同级组合器 + 。

In this example, .expand was not a preceding sibling. Therefore the solution is to place the input element at the root of the document, and then use the selector input[name='panel']:checked ~ label .rotate to change the .rotate element. Note, that the general sibling combinator, ~ is now also being used as opposed to the adjacent sibling combinator, +.

不需要JS - 更新示例

No need for JS - UPDATED EXAMPLE

修改的HTML ：

<input type="checkbox" name="panel" class="hidden" id="panel"/>
<label for="panel">
  Click Me
  <div class="rotate">+</div>
</label>
<div class="expand">
  Content goes here.
</div>

更新的CSS ：

input[name='panel']:checked ~ label .rotate {
    transform: rotate(45deg);
    -o-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
}

$ b $ p

值得注意的是，我将转换属性移动到 .rotate 元素。

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