使用flexbox连续控制项目数 [英] Control item count in a row with flexbox

问题描述

我想按原样在第一行中显示4个项目，但在第二行中仅显示3个项目，然后在第三行中显示4个项目，然后在第四行中显示3个项目，依此类推...

I want to show 4 items in 1st row as it is, but only 3 in second line, and then 4 in 3rd line and 3 in 4th line and so on...

我已经通过nth-child实现了这一目标，但是代码太多了，并且不灵活且不可扩展.

I have achieved this by nth-child but code was too much and not flexible and expandable.

flex可以吗?还是网格?

Is it possible by flex? or grid?

* {
  box-sizing: border-box;
}

.grid-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.grid-wrapper .grid-item {
  width: 25%;
  text-align: center;
  padding: 5px;
}

p {
  background: #ddd;
  padding: 15px;
}

<div class="grid-wrapper">
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>


</div>

推荐答案

您只需要考虑以下一条规则:

You only need to consider one rule like below:

 /*7 = 4 (1st row) + 3 (2nd row) and 5 = 1st element in 2nd row (4 + 1)*/
.grid-wrapper .grid-item:nth-child(7n + 5) {
  width: calc(100%/3);
  flex-grow:0;
}

诀窍是使一个元素更大以触发换行，然后依靠flex-grow来填充空间.

The trick is to make one element bigger to trigger the wrap then rely on flex-grow to fill the space.

完整代码

* {
  box-sizing: border-box;
}

.grid-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.grid-wrapper .grid-item {
  width: 25%;
  text-align: center;
  padding: 5px;
  flex-grow: 1;
}

.grid-wrapper .grid-item:nth-child(7n + 5) {
  width: calc(100%/3);
  flex-grow:0;
}

p {
  background: #ddd;
  padding: 15px;
}

<div class="grid-wrapper">
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div>
  <div class="grid-item">
    <p>Grid Item</p>
  </div><div class="grid-item">
    <p>Grid Item</p>
  </div>
</div>

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