将最后一个伸缩项目放置在容器的末尾 [英] Position last flex item at the end of container

问题描述

此问题涉及具有完全css3支持(包括flexbox)的浏览器.

This question concerns a browser with full css3 support including flexbox.

我有一个Flex容器，里面装有一些物品.它们都可以进行弹性启动，但是我希望 last .end项目可以进行弹性结束.有没有一种好的方法，而无需修改HTML且不求助于绝对定位?

I have a flex container with some items in it. They are all justified to flex-start but I want the last .end item to be justified to flex-end. Is there a good way to do this without modifying the HTML and without resorting to absolute positioning?

.container {
  display: flex;
  flex-direction: column;
  outline: 1px solid green;
  min-height: 400px;
  width: 100px;
  justify-content: flex-start;
}
p {
  height: 50px;
  background-color: blue;
  margin: 5px;
}

<div class="container">
  <p></p>
  <p></p>
  <p></p>
  <p class="end"></p>
</div>

推荐答案

灵活框布局模块-8.1.与自动页边距对齐

弹性项目上的自动边距效果与块流中的自动边距效果非常相似:

Auto margins on flex items have an effect very similar to auto margins in block flow:

• 在计算伸缩度和柔性长度期间，自动边距被视为0.

• During calculations of flex bases and flexible lengths, auto margins are treated as 0.

在通过justify-content和align-self对齐之前，任何正的自由空间都会分配给该维度中的自动边距.

Prior to alignment via justify-content and align-self, any positive free space is distributed to auto margins in that dimension.

因此，您可以使用margin-top: auto在其他元素和最后一个元素之间分配空间.

Therefore you could use margin-top: auto to distribute the space between the other elements and the last element.

这会将最后一个元素放在底部.

This will position the last element at the bottom.

p:last-of-type {
  margin-top: auto;
}

.container {
  display: flex;
  flex-direction: column;
  border: 1px solid #000;
  min-height: 200px;
  width: 100px;
}
p {
  height: 30px;
  background-color: blue;
  margin: 5px;
}
p:last-of-type {
  margin-top: auto;
}

<div class="container">
  <p></p>
  <p></p>
  <p></p>
</div>

同样，您也可以使用margin-left: auto或margin-right: auto水平对齐.

Likewise, you can also use margin-left: auto or margin-right: auto for the same alignment horizontally.

p:last-of-type {
  margin-left: auto;
}

.container {
  display: flex;
  width: 100%;
  border: 1px solid #000;
}
p {
  height: 50px;
  width: 50px;
  background-color: blue;
  margin: 5px;
}
p:last-of-type {
  margin-left: auto;
}

<div class="container">
  <p></p>
  <p></p>
  <p></p>
  <p></p>
</div>

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