文章目录
一、实现代码
html
复制代码
<!DOCTYPE html>
<style>
* {
padding: 0;
margin: 0;
}
body {
display: flex;
width: 100%;
height: 100vh;
justify-content: center;
align-items: center;
}
.list {
display: flex;
width: 336px;
flex-wrap: wrap
}
.list-item {
width: 100px;
height: 50px;
margin-top: 10px;
border: 1px solid gray;
margin-right: 10px;
background-color: gray;
color: #fff;
}
/*list-item 和 moving 同时在一个元素时生效*/
.list-item.moving {
color: transparent;
background-color: transparent;
border: 1px dashed gray !important;
}
</style>
<body>
<div class="list">
<div draggable="true" class="list-item">1</div>
<div draggable="true" class="list-item">2</div>
<div draggable="true" class="list-item">3</div>
<div draggable="true" class="list-item">4</div>
<div draggable="true" class="list-item">5</div>
<div draggable="true" class="list-item">6</div>
<div draggable="true" class="list-item">7</div>
<div draggable="true" class="list-item">8</div>
<div draggable="true" class="list-item">9</div>
</div>
</body>
<script type="text/javascript">
let sourceNode;
const list = document.querySelector(".list");
// 当拖拽开始的时候
list.ondragstart = (e) => {
console.log("当前拖动的节点：");
console.log(e.target);
e.target.classList.add("moving");
sourceNode = e.target;
};
// 当拖拽进入某个节点时候
list.ondragenter = (e) => {
if(e.target === list || e.target === sourceNode) {
return;
}
console.log("拖拽到节点：");
console.log(e.target);
// Array.from ES6：将类数组对象 转成真正的数组 就可以使用数组自带的方法indexOf了
const children = Array.from(list.children);
const sourceIndex = children.indexOf(sourceNode);
const targetIndex = children.indexOf(e.target);
// insertBefore 插入的节点如果在list中存在，那么则会删除，再插入新的位置
if(sourceIndex < targetIndex) {
// 拖拽节点下标小于目标节点的下标
// 在目标节点的下一个元素之前插入拖拽的节点
list.insertBefore(sourceNode, e.target.nextElementSibling);
} else {
// 拖拽节点下标大于目标节点的下标
// 在目标节点之前插入拖拽的节点
list.insertBefore(sourceNode, e.target);
}
};
// 当前拖拽节点拖拽结束
list.ondragend = (e) => {
e.target.classList.remove('moving');
}
// 381 245 976
</script>
</html>
二、实现效果
