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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>拖动排序</title>
<style>
body {
margin: 0;
padding: 0;
}
.box {
display: flex;
font-size: 15px;
}
.items {
margin: 20px 30px;
position: relative;
background-color: #f6f9fa;
overflow: hidden;
border-radius: 4px;
}
.item {
width: 100px;
height: 32px;
line-height: 32px;
text-align: center;
transition: background-color .3s, color .3s, box-shadow .5s;
cursor: pointer;
user-select: none;
-moz-user-select: none;
-ms-user-select: none;
-webkit-user-select: none;
}
.item:hover {
background-color: #00a1d6;
color: #fff;
}
.select {
position: absolute;
background-color: #00a1d6;
color: #fff;
box-shadow: 0 4px 4px #ccc;
z-index: 999;
}
.hold {
cursor: inherit;
border: 1px dashed #ccc;
box-sizing: border-box;
animation: hold-higther 200ms ease-in;
}
@keyframes hold-higther {
0% {
transform: scale(.4);
}
100% {
transform: scale(1);
}
}
</style>
</head>
<body>
<div class="box"></div>
<script>
const $ = selectors => document.querySelector(selectors);
const $$ = selectors => document.querySelectorAll(selectors);
const navList = ['直播', '动画', '番剧', '漫画', '游戏', '舞蹈', '数码', '知识', '生活', '美食', '纪律片', '电影'];
const holdItemDom = document.createElement('div');
holdItemDom.classList.add('item', 'hold');
const listDom = document.createElement('div');
listDom.classList.add('items');
navList.forEach((v, i, arr) => {
const itemDom = document.createElement('div');
itemDom.classList.add('item');
itemDom.dataset.sortindex = i;
itemDom.textContent = v;
listDom.appendChild(itemDom);
});
$('.box').appendChild(listDom);
//主要代码
var dragObj;
//考虑到item数量会很多，不需要给每个item单独绑定mousedown,mousemove,mouseup事件
listDom.onmousedown = (event) => {
let currenIndex, previousIndex;
const itemDomList = $$('.items .item');
const listLength = navList.length;
const startY = event.clientY;
//找到mousedown的item
let selectIndex;
dragObj = event.target;
Array.from(itemDomList).forEach((v, i) => {
if (v === event.target) {
selectIndex = i;
}
});
dragObj.after(holdItemDom);
dragObj.classList.add('select');
dragObj.style.top = dragObj.clientHeight * selectIndex + 'px';
const itemHeight = dragObj.clientHeight;
let topIndex = selectIndex;
const startTop = dragObj.style.top;
previousIndex = Math.ceil((parseInt(startTop) - itemHeight / 2) / itemHeight);
document.onmousemove = function (event) {
dragObj.classList.add('select');
const moveY = event.clientY;
const presentTop = parseInt(startTop) + (moveY - startY);
dragObj.style.top = presentTop + 'px';
currenIndex = Math.ceil((presentTop - itemHeight / 2) / itemHeight);
if (currenIndex < 0) currenIndex = 0;
if (currenIndex > listLength - 1) currenIndex = listLength - 1;
if (previousIndex !== currenIndex) {
holdItemDom.remove();
if (previousIndex > currenIndex && currenIndex < topIndex) {
dragObj.remove();
itemDomList[currenIndex].before(dragObj);
dragObj.after(holdItemDom);
} else {
const currentItems = $$('.box .item');
currentItems[currenIndex].after(holdItemDom);
}
previousIndex = currenIndex;
if (currenIndex < topIndex) topIndex = currenIndex;
}
};
document.onmouseup = function (event) {
const currentItems = $$('.box .item');
if (currenIndex > topIndex) {
currentItems[currenIndex].after(dragObj);
}
holdItemDom.remove();
dragObj.classList.remove('select');
dragObj.removeAttribute('style');
document.onmousemove = null;
document.onmouseup = null;
}
};
</script>
</body>
</html>