我想找到一种方法,让单个容器中的元素换行到与前一行相反的方向的新行,就像一条蛇向后弯曲一样。我无法使用 flexbox 以及 flex-direction 和 flex-wrap 属性的任何组合来实现此结果。
Flexbox 结果与期望结果的图像比较:
这是显示弹性盒结果与所需结果(伪造的)的片段:
body {
font: 400 14px 'Arial', sans-serif;
}
.title {
font-size: 1em;
padding: 20px 0;
}
.title:first-child {
padding: 0 0 20px;
}
.flex-container, .fake-container, .fake-row {
width: 500px;
background: orange;
display: flex;
}
.flex-container {
flex-flow: row wrap; /* any combination of row/reverse & wrap/reverse */
}
.item {
display: inline-block;
background: purple;
width: 80px;
max-width: 80px;
height: 80px;
margin: 10px;
line-height: 80px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
}
.fake-container {
flex-flow: column nowrap;
}
.fake-row {
flex-flow: row wrap;
height: 100px;
}
.fake-row:nth-child(2) {
flex-flow: row-reverse wrap;
}
<div class="title">Flexbox result:</div>
<div class="flex-container">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
<div class="item">5</div>
<div class="item">6</div>
<div class="item">7</div>
</div>
<div class="title">Desired result (faked):</div>
<div class="fake-container">
<div class="fake-row">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
<div class="item">5</div>
</div>
<div class="fake-row">
<div class="item">6</div>
<div class="item">7</div>
</div>
</div>
尽管我很想找到一个纯 CSS 解决方案来实现这种“蛇形包裹”,但我开始怀疑它的可能性。我确信可以采用 JavaScript 解决方案,但我不确定如何继续创建一个解决方案而不使事情变得过于复杂。
有没有简单的解决方案?感谢您的时间。
CSS 网格解决方案类似于这个 https://stackoverflow.com/a/58598708/8620333它适用于每行固定数量的元素(也称为固定数量的列)。
.flex-container {
width: 500px;
background: orange;
display: grid;
grid-template-columns:repeat(5,1fr); /*define the number of column*/
grid-auto-flow:dense; /* this is important to fill all the space*/
grid-gap:20px;
padding:10px;
}
.item {
background: purple;
height: 80px;
line-height: 80px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
}
.item:nth-child(10n + 6) {grid-column:5}
.item:nth-child(10n + 7) {grid-column:4}
.item:nth-child(10n + 8) {grid-column:3}
.item:nth-child(10n + 9) {grid-column:2}
/*.item:nth-child(10n + 10) {grid-column:1} not needed*/
/* For N = number of columns
.item:nth-child((2xN)n + (N+1)) { grid-column:N; }
.item:nth-child((2xN)n + (N+2)) { grid-column:(N-1); }
....
.item:nth-child((2xN)n + (2xN)) { grid-column:1; }
*/
.item:before {
content:counter(num);
counter-increment:num;
}
body {
font: 400 14px 'Arial', sans-serif;
counter-reset:num;
}
<div class="flex-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 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 class="item"></div>
<div class="item"></div>
</div>
如果你想要一个通用的解决方案,这里是使用 JS 和 flexbox 的解决方案。诀窍是设置order
基于每个项目的行位置的属性。我会依靠这个旧答案 https://stackoverflow.com/a/49046973/8620333进行大部分计算以找到行/列数:
//total number of element
var elems = document.querySelectorAll('.item');
var n_t = elems.length;
//width of an element
var w = parseInt(document.querySelector('.item').offsetWidth);
//full width of element with margin
var m = document.querySelector('.item').currentStyle || window.getComputedStyle(document.querySelector('.item'));
w = w + parseInt(m.marginLeft) + parseInt(m.marginRight);
//width of container
var w_c = parseInt(document.querySelector('.flex-container').offsetWidth);
//padding of container
var c = document.querySelector('.flex-container').currentStyle || window.getComputedStyle(document.querySelector('.flex-container'));
var p_c = parseInt(c.paddingLeft) + parseInt(c.paddingRight);
var adjust = function(){
//only the width of container will change
w_c = parseInt(document.querySelector('.flex-container').offsetWidth);
//Number of columns
nb = Math.min(parseInt((w_c - p_c) / w),n_t);
//Number of rows
nc = Math.ceil(n_t/nb);
for(var j = 0;j<nb;j++) {
for(var i = 0;i<nc;i++) {
if(j + i*nb >= n_t) /* we exit if we reach the number of elements*/
break
if(i%2!=1)
elems[j + i*nb].style.order=j + i*nb; /* normal flow */
else
elems[j + i*nb].style.order=(nb - j) + i*nb; /* opposite flow */
}
}
}
adjust()
window.addEventListener('resize', function(){adjust()})
.flex-container {
background: orange;
display: flex;
flex-wrap:wrap;
}
.item {
background: purple;
height: 80px;
width:80px;
margin:10px;
line-height: 80px;
grid-gap:20px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
}
.item:before {
content:counter(num);
counter-increment:num;
}
body {
font: 400 14px 'Arial', sans-serif;
counter-reset:num;
}
<div class="flex-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 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 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>
在某些情况下,当最后一行未充满项目时,会出现一些小问题。您可以通过向最后一个元素添加一些边距来纠正此问题
//total number of element
var elems = document.querySelectorAll('.item');
var n_t = elems.length;
//width of an element
var w = parseInt(document.querySelector('.item').offsetWidth);
//full width of element with margin
var m = document.querySelector('.item').currentStyle || window.getComputedStyle(document.querySelector('.item'));
w = w + parseInt(m.marginLeft) + parseInt(m.marginRight);
//width of container
var w_c = parseInt(document.querySelector('.flex-container').offsetWidth);
//padding of container
var c = document.querySelector('.flex-container').currentStyle || window.getComputedStyle(document.querySelector('.flex-container'));
var p_c = parseInt(c.paddingLeft) + parseInt(c.paddingRight);
var adjust = function(){
//only the width of container will change
w_c = parseInt(document.querySelector('.flex-container').offsetWidth);
//Number of columns
nb = Math.min(parseInt((w_c - p_c) / w),n_t);
//Number of rows
nc = Math.ceil(n_t/nb);
for(var j = 0;j<nb;j++) {
for(var i = 0;i<nc;i++) {
if(j + i*nb >= n_t) /* we exit if we reach the number of elements*/
break
elems[j + i*nb].style.marginLeft='10px'; /*we rest the margin*/
if(i%2!=1)
elems[j + i*nb].style.order=j + i*nb; /* normal flow */
else {
elems[j + i*nb].style.order=(nb - j) + i*nb; /* opposite flow */
/*margin fix*/
if(i == (nc - 1) && (j + i*nb == (n_t - 1)) && j<(nb-1)) {
elems[j + i*nb].style.marginLeft=((nb*nc - n_t)*w + 10) + 'px';
}
}
}
}
}
adjust()
window.addEventListener('resize', function(){adjust()})
.flex-container {
background: orange;
display: flex;
flex-wrap:wrap;
}
.item {
background: purple;
height: 80px;
width:80px;
margin:10px;
line-height: 80px;
grid-gap:20px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
}
.item:before {
content:counter(num);
counter-increment:num;
}
body {
font: 400 14px 'Arial', sans-serif;
counter-reset:num;
}
<div class="flex-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 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 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>
您只需更改即可轻松切换到另一个方向if(i%2!=1)
to if(i%2!=0)
//total number of element
var elems = document.querySelectorAll('.item');
var n_t = elems.length;
//width of an element
var w = parseInt(document.querySelector('.item').offsetWidth);
//full width of element with margin
var m = document.querySelector('.item').currentStyle || window.getComputedStyle(document.querySelector('.item'));
w = w + parseInt(m.marginLeft) + parseInt(m.marginRight);
//width of container
var w_c = parseInt(document.querySelector('.flex-container').offsetWidth);
//padding of container
var c = document.querySelector('.flex-container').currentStyle || window.getComputedStyle(document.querySelector('.flex-container'));
var p_c = parseInt(c.paddingLeft) + parseInt(c.paddingRight);
var adjust = function(){
//only the width of container will change
w_c = parseInt(document.querySelector('.flex-container').offsetWidth);
//Number of columns
nb = Math.min(parseInt((w_c - p_c) / w),n_t);
//Number of rows
nc = Math.ceil(n_t/nb);
for(var j = 0;j<nb;j++) {
for(var i = 0;i<nc;i++) {
if(j + i*nb >= n_t) /* we exit if we reach the number of elements*/
break
elems[j + i*nb].style.marginLeft='10px'; /*we rest the margin*/
if(i%2!=0)
elems[j + i*nb].style.order=j + i*nb; /* normal flow */
else {
elems[j + i*nb].style.order=(nb - j) + i*nb; /* opposite flow */
/*margin fix*/
if(i == (nc - 1) && (j + i*nb == (n_t - 1)) && j<(nb-1)) {
elems[j + i*nb].style.marginLeft=((nb*nc - n_t)*w + 10) + 'px';
}
}
}
}
}
adjust()
window.addEventListener('resize', function(){adjust()})
.flex-container {
background: orange;
display: flex;
flex-wrap:wrap;
}
.item {
background: purple;
height: 80px;
width:80px;
margin:10px;
line-height: 80px;
grid-gap:20px;
color: white;
font-weight: bold;
font-size: 2em;
text-align: center;
}
.item:before {
content:counter(num);
counter-increment:num;
}
body {
font: 400 14px 'Arial', sans-serif;
counter-reset:num;
}
<div class="flex-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 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 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>
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