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drag-demo.html
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drag-demo.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>拖动</title>
<style>
h2 {
font-size: 20px;
color: #0d88c1;
}
div#left,
div#right {
width: 120px;
float: left;
margin: 10px 100px 10px 0px;
height: 240px;
background-color: #dddddd;
overflow-y: auto;
}
div label {
font-size: 22px;
font-weight: bold;
width: 100%;
display: inline-block;
padding: 4px 0;
text-align: center;
margin: 0px 0 2px 0;
color: #fff;
background-color: #0d88c1;
}
.over {
border: 1px dashed red;
box-sizing: border-box;
}
</style>
</head>
<body>
<h2>拖放（Drag 和 drop）</h2>
<!-- 左边元素框 -->
<div id="left">
<label draggable="true">index1</label>
<label draggable="true">index2</label>
<label draggable="true">index3</label>
<label draggable="true">index4</label>
<label draggable="true">index5</label>
<label draggable="true">index6</label>
<label draggable="true">index7</label>
</div>
<!-- 右边元素框 -->
<div id="right"></div>
<script>
var moveItem = document.getElementsByTagName('label');
for (let i = 0; i < moveItem.length; i++) {
//动态设置label元素id
moveItem[i].setAttribute('id', 'label' + i);
moveItem[i].ondragstart = function (ev) {
//dataTransfer.setData() 方法设置被拖数据的数据类型和值
ev.dataTransfer.setData("id", this.id);
};
}
document.getElementById('right').ondragover = function (ev) {
ev.preventDefault(); //阻止向上冒泡
}
document.getElementById('right').ondragenter = function (ev) {
ev.target.classList.add('over')
}
document.getElementById('right').ondragleave = function (ev) {
ev.target.classList.remove('over')
}
document.getElementById('right').ondrop = function (ev) {
ev.preventDefault();
ev.target.classList.remove('over')
var id = ev.dataTransfer.getData('id');
var elem = document.getElementById(id); //当前拖动的元素
var toElem = ev.toElement.id; //放置位置
if (toElem == 'right') {
//如果为container,元素放置在末尾
this.appendChild(elem);
} else {
//如果为container里的元素，则插入该元素之前
this.insertBefore(elem, document.getElementById(toElem));
}
}
document.getElementById('left').ondragover = function (ev) {
ev.preventDefault(); //阻止向上冒泡
}
document.getElementById('left').ondragenter = function (ev) {
ev.target.classList.add('over')
}
document.getElementById('left').ondragleave = function (ev) {
ev.target.classList.remove('over')
}
document.getElementById('left').ondrop = function (ev) {
ev.preventDefault();
ev.target.classList.remove('over')
var id = ev.dataTransfer.getData('id');
var elem = document.getElementById(id);
var toElem = ev.toElement.id;
if (toElem == 'left') {
//如果为container,元素放置在末尾
this.appendChild(elem);
} else {
//如果为container里的元素，则插入该元素之前
this.insertBefore(elem, document.getElementById(toElem));
}
}
</script>
</body>
</html>