在可变高度的父项中垂直对齐 div

Question

我有一个包装器，它的高度是可变的（取决于左边框中的内容）。我希望此包装内的 button 在右侧框内垂直对齐。

我无法让它工作，虽然我已经尝试了很多东西，包括 css-tricks' post on centering，我已将其放在评论下。我也尝试修改 flexbox，但没有成功。

.wrapper {
    width: 20em;
    margin: 1em;
    border: 1px solid #999;
    overflow: hidden;
}
.left {
    float: left;
    width: 70%;
}
.right {
    position: relative;
    overflow: hidden; /* to induce block formatting context */
}
.button {
    width: 3em;
    border: 1px solid #999;
    margin: 0 auto;

    /*
    // The below didn't work! the `button` vanishes.
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    */
}

<div class="wrapper">
  <div class="left">Every person is worth just as much as the things they busy themselves with.</div>
  <div class="right">
    <div class="button">button</div>
  </div>
</div>

Answer 1

您可以使用 display:inline-block; 而不是 float left; 并且不要忘记 remove extra spaces 这是由 display:inline-block; 发生的。

.wrapper {
    width: 20em;
    margin: 1em;
    border: 1px solid #999;
    overflow: hidden;
}
.left,
.right
{
  display:inline-block;
  vertical-align:middle;
  }
.left {
    width: 70%;
}
.right {
    position: relative;
    overflow: hidden; /* to induce block formatting context */
  text-align:center;
  width:30%;
}
.button {
    width: 3em;
    border: 1px solid #999;
    margin: 0 auto;

    /*
    // The below didn't work! the `button` vanishes.
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    */
}

<div class="wrapper">
  <div class="left">Every person is worth just as much as the things they busy themselves with.</div><div class="right">
    <div class="button">button</div>
  </div>
</div>

Answer 2

这里的主要问题是您需要左右 div 自动具有相同的高度。除了 javascript，只有 flexbox 和 css 表允许这样做。所以...

Flexbox可以做到这一点。

.wrapper {
  width: 20em;
  margin: 1em;
  border: 1px solid #999;
  overflow: hidden;
  display: flex;
}
.left {
  flex: 0 0 70%;
}
.right {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}
.button {
  width: 3em;
  border: 1px solid #999;
  text-align: center;
}

<div class="wrapper">
  <div class="left">Every person is worth just as much as the things they busy themselves with.</div>
  <div class="right">
    <div class="button">button</div>
  </div>
</div>

或...CSS 表

.wrapper {
  width: 20em;
  margin: 1em;
  border: 1px solid #999;
  overflow: hidden;
  display: table;
  table-layout: fixed;
}

.left {
  display: table-cell;
  width: 70%;
}

.right {
  display: table-cell;
  width: 30%;
  vertical-align: middle;
  text-align: center;
}

.button {
  width: 3em;
  border: 1px solid #999;
  margin: auto;
}

<div class="wrapper">
  <div class="left">Every person is worth just as much as the things they busy themselves with.</div>
  <div class="right">
    <div class="button">button</div>
  </div>
</div>

Answer 3

如果您愿意使用 calc:

.button {
    width: 3em;
    border: 1px solid #999;
    margin: calc(50% - 0.5em) 0 calc(50% - 0.5em) 0;

不过有一个问题：calc 不接受其他参数，例如按钮的高度；所以我假设它是 1em（因为你没有定义高度）。

Answer 4

看看这个风格的锻炼，

.wrapper{
  width: 20em;
  margin: 1em;
  border: 1px solid #999;
}
.left{
  float: left;
  width: 15em;
}
.right{
  width: 5em;
  float: right;
}

.button {
  width: 3em;
  border: 1px solid #999;
  margin: 1em;
}

在可变高度的父项中垂直对齐 div

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