如何将列与flexbox对齐？

Question

我目前正在学习Flexbox布局，但找不到解决我问题的方法。

我尝试使用justify-content和flex-basis，但是它不起作用。有人有解决方案吗？

我想要的结果：here

我得到的结果是：https://jsfiddle.net/qdsbacvn/

<section>
  <div class="column" id="first">First</div>
  <div class="column" id="second">Second</div>
  <div class="column">Third</div>
</section>
<section>
  <div class="column">First</div>
  <div class="column">Second</div>
  <div class="column">Third</div>
  <div class="column">Fourth</div>
  </div>
</section>

section {
  display: flex;
  margin: 0 auto;
  justify-content: space-between;
}

.column {
  width: 100%;
  background-color: #e2e2e2;
  padding: 1%;
  margin: 1%;
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: 0;

}

#first {
  flex-grow: 2;
  flex-shrink: 2;
  flex-basis: 0;
}

Answer 1

这是CSS网格的理想用例，不需要大量复杂的代码：

section {
  display: grid;
  margin: 2% auto;
  grid-gap:2%;
  grid-template-columns:repeat(4,1fr);
}

.column {
  background-color: #e2e2e2;
  padding: 5px;
}

#first {
  grid-column:span 2;
}

<section>
  <div class="column" id="first">First</div>
  <div class="column" id="second">Second</div>
  <div class="column">Third</div>
</section>
<section>
  <div class="column">First</div>
  <div class="column">Second</div>
  <div class="column">Third</div>
  <div class="column">Fourth</div>
</section>

使用flexbox，您可以尝试以下操作：

section {
  display: flex;
}

.column {
  background-color: #e2e2e2;
  padding: 1%;
  margin: 1%;
  flex-grow: 1;
  flex-basis: 0;
}

#first {
  flex-grow: 2;
  flex-basis:4%; /*2 x (padding + margin)*/
}

<section>
  <div class="column" id="first">First</div>
  <div class="column" id="second">Second</div>
  <div class="column">Third</div>
</section>
<section>
  <div class="column">First</div>
  <div class="column">Second</div>
  <div class="column">Third</div>
  <div class="column">Fourth</div>
</section>

由于您使用的是flex-basis:0，因此在计算可用空间之前仅考虑填充/边距。诀窍是要确保在两种情况下我们都具有相同的可用空间，从而在大元素的flex-basis中添加第一种情况下不存在的边距/填充。

Answer 2

检查我的代码。我已经稍微增加了柔韧性盒的值。

section {
  display: flex;
  margin: 0 auto;
  justify-content: space-between;
}

.column {
  width: 100%;
  background-color: #e2e2e2;
  padding: 1%;
  margin: 1%;
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: 0;
}

#first {
  flex-grow: 2.2;
  flex-shrink: 2;
  flex-basis: 0;
}

<section>
  <div class="column" id="first">First</div>
  <div class="column">Second</div>
  <div class="column">Third</div>
</section>
<section>
  <div class="column">First</div>
  <div class="column">Second</div>
  <div class="column">Third</div>
  <div class="column">Fourth</div>
</section>

Answer 3

对于您的用例来说有些过大，但是如果您需要添加更多行或页边距需要更改大小，则它是一个更可靠的解决方案。

.parent {
  display: flex;
  flex-direction:row;
}

.column {
  flex:1;
  display:flex;
  flex-direction:column
}
.column:first-child {
  flex:2;
}
.col-row {
  flex:1;
  display:flex;
  flex-direction:row;
}

.col-row > div{
  flex:1;
  display:flex;
  flex-direction:row;
  margin:1vw;
  padding:1vw;
  background-color: #e2e2e2;
}

<div class="parent">
  <div class="column">
    <div class="col-row">
       <div>First</div>
    </div>
    <div class="col-row">
      <div>First</div>
      <div>Second</div>
    </div>
  </div>
  <div class="column">
     <div class="col-row">
        <div>Second</div>
     </div>
     <div class="col-row">
        <div>Third</div>
     </div>
  </div>
  <div class="column">
    <div class="col-row">
        <div>Third</div>
     </div>
     <div class="col-row">
        <div>Fourth</div>
     </div>
  </div>
</div>