垂直居中并左对齐一列弹性项目

Question

要求

1. Flexbox的
2. 垂直中间
3. 水平左
4. 垂直堆积的儿童元素
5. 子元素的数量可以是一个或多个
6. 使用旧语法,以便Android 4.2了解

听起来很难描述.演示中的粉红色框是我想要的外观.绿色框已经很好了,只是我不知道如何处理多个子元素.

我认为解决方案可能是以下的组合,但我无法做到.

align-items: center;
flex-direction: column;

body {
  margin: 1em .5em;
}
article {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

section {
  height: 18em;
  background: #ccc;
  margin: 0 .5em;
  position: relative;
  display: flex;
  align-items: center;
}
section:after {
  font-size: smaller;
  color: blue;
  position: absolute;
  bottom: 0;
}
section.big {
  width: 20%;
  height: 5em;
}
section.small {
  width: 10%;
  flex: 1;
}
section div {
  outline: 1px dotted green;
}
section.want {
  background-color: pink;
}
section.want:after {
  content: "1) want to do like this: vertically middle, horizontally left, while section will contain one or several child elements";
}
section.only1 {
  background-color: lightgreen;
}
section.only1:after {
  content: "2) all good except one point:the number of child element must be one.";
}
section.row:after {
  content: "3) by default flex-diraction is row";
}
section.col {
  flex-direction: column;
}
section.col:after {
  content: "4) this can vertically stack multiple stacks, but they no longer horizontally left-align";
}
section.col.justify {
  justify-content: center;
  align-items: flex-start;
  background-color: lightblue;
}
section.col.justify:after {
  content: "6) this is good!  Solved.";
}
section.colmar {
  flex-direction: column;
}
section.colmar:after {
  content: "5) this can vertically stack multiple stacks, and left-align divs, but divs are not vertically center";
}
section.colmar div {
  margin-right: auto;
}

<article>
  <section class="small want">
    line1
    <br/>line2
  </section>
  <section class="small only1">
    <div>only 1 div</div>
  </section>
  <section class="small row">
    <div>div1</div>
    <div>div2</div>
  </section>
  <section class="small col">
    <div>div1</div>
    <div>div2</div>
  </section>
  <section class="small colmar">
    <div>div1</div>
    <div>div2</div>
  </section>
  <section class="small col justify">
    <div>div1</div>
    <div>div2</div>
  </section>
</article>

codepen演示

Answer 1

justify-content 沿主轴对齐弹性项目.

align-items 沿横轴对齐柔性项目,横轴始终垂直于主轴.

取决于flex-direction,主轴可以是水平的或垂直的.

由于flex-direction:column主轴是垂直的,因此您需要使用justify-content不align-items使柔性项居中.

这是一个例子:

#container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 200px;
  background-color: lightpink;
}

<div id="container">
  <div class="box">div 1</div>
  <div class="box">div 2</div>
  <div class="box">div 3</div>
  <div class="box">div 4</div>
  <div class="box">div 5</div>
</div>

了解有关沿主轴的柔性对齐的更多信息:

• 在CSS Flexbox中,为什么没有"justify-items"和"justify-self"属性？

在此处了解有关沿交叉轴的柔性对齐的更多信息:

• flex-wrap如何使用align-self,align-items和align-content？