如何使用 Flexbox 中的媒体查询控制每行的项目数？

Question

所以假设我有以下标记

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

以及以下样式(SASS)

@mixin max-width($width) {
    @media screen and (max-width: $width) {
        @content;
    }
}

.container {
    display: flex;

    @include max-width(992px) {
        number: 4; //Hypothetical property that is supposed to control number per row
    }

    @include max-width(640px) {
        number: 2; //Hypothetical property that is supposed to control number per row
    }
}
.item {
    background-color: tomato;
    padding: 20px;
    margin-right: 20px;
    flex: 1;
}

是否有真正的 Flexbox CSS 替代我假设的 number 属性可以控制每行显示多少项目？

浮动式网格很方便，因为 width 每个 .row 可以容纳无限 .items 个。但是对于 flexbox，我必须使用许多 .row 类之类的变通方法来控制不同宽度的项目的布局和数量。到目前为止，我很幸运，但有些类型的布局会因这种方法而失败。

Codepen link to demonstrate

Answer 1

我不得不去除块周围的边距，因为百分比宽度很难清楚地应用于有边距的元素，但您可以在 http://codepen.io/anon/pen/jPeLYb?editors=110 看到变化：

@mixin max-width($width) {
    @media screen and (max-width: $width) {
        @content;
    }
}

.container {
    position: relative;
    display: flex;
    flex-flow: row wrap;
}
.item {
    background-color: tomato;
    box-sizing: border-box;
    padding: 20px;
    outline: 2px solid blue;
    flex: 1;
}

@include max-width(992px) {
    .item {
        flex-basis: 25%;
        background-color: red;
    }
}

@include max-width(640px) {
    .item {
        flex-basis: 50%;
        background-color: green;
    }
}

这里的重要部分是：

flex-flow: row wrap 允许 flexbox 出现在多行上（默认是 nowrap）
flex-basis 在这种情况下相当于 width
position: relative 这使得宽度相对于容器，而不是主体（这会搞砸四舍五入）

Answer 2

我找到了一个更好的解决方案，可以在不使用媒体查询的情况下限制不同设备中一行中的列数：

HTML:

<div class="flex-container">
    <div class="item">
        <h3>ONE</h3>
        Lorem ipsum dolor sit, amet consectetur adipisicing elit. Cumque maxime odit ipsam, fugit pariatur quis eos
        maiores nostrum? Alias tempora voluptate veritatis omnis quae corporis vero excepturi in rem ipsam.
    </div>
    <div class="item">
        <h3>TWO</h3>
        Lorem ipsum dolor sit, amet consectetur adipisicing elit. Cumque maxime odit ipsam, fugit pariatur quis eos
        maiores nostrum? Alias tempora voluptate veritatis omnis quae corporis vero excepturi in rem ipsam.
    </div>
    <div class="item">
        <h3>THREE</h3>
        Lorem ipsum dolor sit, amet consectetur adipisicing elit. Cumque maxime odit ipsam, fugit pariatur quis eos
        maiores nostrum? Alias tempora voluptate veritatis omnis quae corporis vero excepturi in rem ipsam.
    </div>
    <div class="item">
        <h3>FOUR</h3>
        Lorem ipsum dolor sit, amet consectetur adipisicing elit. Cumque maxime odit ipsam, fugit pariatur quis eos
        maiores nostrum? Alias tempora voluptate veritatis omnis quae corporis vero excepturi in rem ipsam.
    </div>
</div>

CSS:

.flex-container {
        display: flex;
        flex-wrap: wrap;
}
.item {
        box-sizing: border-box;
        flex: 1 0 250px;
        margin: 1rem;
        padding: 1rem;
        border: 1px solid #000;
        border-radius: 5px;
}

Codepen link: https://codepen.io/bala285/pen/YzqpLod

来源：https://www.fourkitchens.com/blog/article/responsive-multi-column-lists-flexbox/

如何使用 Flexbox 中的媒体查询控制每行的项目数？

How to control number of items per row using media queries in Flexbox?

css

sass

flexbox

media-queries