是否可以定义一个具有最大列数的网格,但允许元素在屏幕宽度变化时换行到新行?
我已经实现了允许行换行到新行的类,但没有最大列数。
这是一种方法的 CodePen 使用 Flexbox:
CSS:
.flex-container {
display: flex;
flex-wrap: wrap;
}
另一种方法是使用网格:
.grid {
display: grid;
counter-reset: grid-items;
position: relative;
}
.grid--auto-fit {
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
我想要一个相当通用的解决方案。我想要实现的目标是否可以在没有 JavaScript 或媒体查询的情况下实现?
使用 CSS 网格,您可以考虑使用
max(width, 100%/N)
,其中 N
是最大列数。如果容器的宽度增加,100%/N
肯定会大于width
,因此每行不会有超过N
个元素。
.grid-container {
--n: 4; /* The maximum number of columns */
display: grid;
grid-template-columns: repeat(auto-fill, minmax(max(200px, 100%/var(--n)), 1fr));
}
.grid-item {
background: tomato;
padding: 5px;
height: 50px;
margin: 10px;
line-height: 50px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
box-sizing: border-box;
}
<div class="grid-container">
<div class="grid-item">1</div>
<div class="grid-item">2</div>
<div class="grid-item">3</div>
<div class="grid-item">4</div>
<div class="grid-item">5</div>
<div class="grid-item">6</div>
<div class="grid-item">7</div>
<div class="grid-item">8</div>
</div>
<div class="grid-container" style="--n:3">
<div class="grid-item">1</div>
<div class="grid-item">2</div>
<div class="grid-item">3</div>
<div class="grid-item">4</div>
<div class="grid-item">5</div>
<div class="grid-item">6</div>
<div class="grid-item">7</div>
<div class="grid-item">8</div>
</div>
有间隙:
.grid-container {
--n: 4; /* The maximum number of columns */
display: grid;
grid-template-columns: repeat(auto-fill,
minmax(max(200px,(100% - (var(--n) - 1)*10px)/var(--n)), 1fr));
gap: 10px;
margin: 5px;
}
.grid-item {
background: tomato;
padding: 5px;
height: 50px;
line-height: 50px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
box-sizing: border-box;
}
<div class="grid-container">
<div class="grid-item">1</div>
<div class="grid-item">2</div>
<div class="grid-item">3</div>
<div class="grid-item">4</div>
<div class="grid-item">5</div>
<div class="grid-item">6</div>
<div class="grid-item">7</div>
<div class="grid-item">8</div>
</div>
<div class="grid-container" style="--n:3">
<div class="grid-item">1</div>
<div class="grid-item">2</div>
<div class="grid-item">3</div>
<div class="grid-item">4</div>
<div class="grid-item">5</div>
<div class="grid-item">6</div>
<div class="grid-item">7</div>
<div class="grid-item">8</div>
</div>
使用 Flexbox,您只需为容器设置
max-width
,因为您的元素具有固定宽度:
.flex-container {
display: flex;
flex-wrap: wrap;
max-width: calc(5*(200px + 20px));
}
.flex-item {
background: tomato;
padding: 5px;
width: 200px;
height: 100px;
margin: 10px;
line-height: 100px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
box-sizing: border-box;
}
<div class="flex-container wrap">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
</div>
唯一的缺点是您需要知道元素的宽度及其边距才能正确设置
max-width
。
如果您希望元素扩展并覆盖所有宽度,您可以使用
min-width
的技巧,如下所示:
.flex-container {
display: flex;
flex-wrap: wrap;
}
.flex-item {
background: tomato;
padding: 5px;
min-width: 200px;
width: calc(100%/5 - 20px); /* 5 columns */
height: 100px;
margin: 10px;
line-height: 100px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
box-sizing: border-box;
}
<div class="flex-container wrap">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
</div>
这里还需要考虑保证金。您可以使用 CSS 变量轻松地使其更加灵活:
.flex-container {
display: flex;
flex-wrap: wrap;
}
.flex-item {
--m: 10px;
background: tomato;
padding: 5px;
min-width: 200px;
width: calc(100%/5 - 2*var(--m)); /* 5 columns */
height: 100px;
margin: var(--m);
line-height: 100px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
box-sizing: border-box;
}
<div class="flex-container wrap">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
</div>
如果您希望元素始终展开(即使有换行),您也可以考虑
flex-grow
,但您可能会面临需要通过一些技巧来修复的最后一行的问题:
.flex-container {
display: flex;
flex-wrap: wrap;
--m: 10px;
}
.flex-item {
background: tomato;
padding: 5px;
min-width: 200px;
flex-grow: 1;
width: calc(100%/5 - 2*var(--m)); /* 5 columns */
height: 100px;
margin: var(--m);
line-height: 100px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
box-sizing: border-box;
}
.flex-container span {
min-width: 200px;
flex-grow: 1;
width: calc(100%/5 - 2*var(--m)); /* 5 columns */
margin: 0 var(--m);
}
<div class="flex-container wrap">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
<!-- 4 empty elements to fix the issue (we can also use a pseudo element) -->
<span></span>
<span></span>
<span></span>
<span></span>
</div>
在下面的示例中,我们将列数设置为 5,因此我们至少需要 4 个空元素来解决问题,以防最后一行中有 1 到 4 个元素。
当然,这是一个缺点,但由于您知道列数,您可以轻松设置这些空元素,并且不需要任何 JavaScript。
为了使其更加灵活,这里有一个 CSS 变量的想法:
.flex-container {
display: flex;
flex-wrap: wrap;
border: 1px solid;
--m: 10px;
--n: 5;
--width: 150px;
}
.flex-item {
background: tomato;
min-width: var(--width);
flex-grow: 1;
width: calc(100%/var(--n) - 2*var(--m));
height: 50px;
margin: var(--m);
box-sizing: border-box;
}
.flex-container span {
display: contents; /* Each span will give us 2 elements */
}
.flex-container span: before,
.flex-container span: after,
.flex-container: before,
.flex-container: after{
content: "";
min-width: var(--width);
flex-grow: 1;
width: calc(100%/var(--n) - 2*var(--m));
margin :0 var(--m);
order: 1; /* We make sure they are at the end */
}
<div class="flex-container wrap">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
<!-- A lot of elements !! -->
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
<div class="flex-container wrap" style="--n:10">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
<!-- A lot of elements !! -->
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
<div class="flex-container wrap" style="--n:3">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
<div class="flex-item">8</div>
<!-- A lot of elements !! -->
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
我使用
display: contents
能够设置N个空元素,稍后将其视为2*N,这样可以减少代码。
如果您有 7 列,我们只需要 6 个额外元素。我们可以使用两个伪元素,然后仅使用 2 个空元素来覆盖剩余的 4 个。
通过一点数学知识,您可以在 minmax 内的最大值函数中添加百分比。这样,它会在 200 像素处中断,但会扩展以填充页面的 1/3(在本例中,因为我使用了 33%。不过,只需添加您想要的任何百分比即可)。
grid-template-columns: repeat(auto-fit, minmax(max(200px, 33%), 1fr));