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Usage examples of html5 drag and drop (code)
- 不言forward
- 2019-04-11 13:26:553164browse
This article brings you usage examples (code) of drag and drop in HTML5. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
5 minutes to figure out the drag and drop of html5, as well as the order of other monitoring events and execution.
Examples are as follows:
<!DOCTYPE html>
<html>
<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>5分钟drag and drop简明示例</title>
<style>
#draggable {
width: 200px;
height: 20px;
text-align: center;
background: white;
}
.dropzone {
width: 200px;
height: 20px;
background: blueviolet;
margin-bottom: 10px;
padding: 10px;
}
</style>
<script>
var dragged;
document.addEventListener("dragstart", function (event) {
console.log('==========dragstart 开始被拖拽==========一次拖动只执行一次');
// 保存拖动元素的引用(ref.)
dragged = event.target;
// 使其半透明
event.target.style.opacity = .5;
}, false);
/* 拖动目标元素时触发drag事件 */
document.addEventListener("drag", function (event) {
// console.log('==========drag==========拖拽时会一直监听，直到放下元素');
}, false);
/* 放置目标元素时触发事件 */
document.addEventListener("dragover", function (event) {
// console.log('==========dragover==========拖拽时会一直监听，直到放下元素');
// 阻止默认动作以启用drop
event.preventDefault();
}, false);
document.addEventListener("dragenter", function (event) {
console.log('==========dragenter 拖曳元素 进入目标元素==========对应着dragleave');
// 当可拖动的元素进入可放置的目标时高亮目标节点
if (event.target.className == "dropzone") {
event.target.style.background = "purple";
}
}, false);
document.addEventListener("dragleave", function (event) {
console.log('==========dragleave 拖曳元素 离开目标元素==========对应着dragenter');
// 当拖动元素离开可放置目标节点，重置其背景
if (event.target.className == "dropzone") {
event.target.style.background = "";
}
}, false);
document.addEventListener("drop", function (event) {
console.log('==========drop 放下元素==========一次拖动只执行一次，在dragenter前触发');
// 阻止默认动作（如打开一些元素的链接）
event.preventDefault();
// 将拖动的元素到所选择的放置目标节点中
if (event.target.className == "dropzone") {
event.target.style.background = "";
dragged.parentNode.removeChild(dragged);
event.target.appendChild(dragged);
}
}, false);
document.addEventListener("dragend", function (event) {
console.log('==========dragend 结束拖拽==========一次拖动只执行一次');
// 重置透明度
event.target.style.opacity = "";
}, false);
</script>
</head>
<body>
<div>
<div id="draggable" draggable="true" ondragstart="event.dataTransfer.setData('text/plain',null)">
这是可以拖拽的DIV
</div>
</div>
<div></div>
<div></div>
<div></div>
</body>
</html>[Related recommendations: HTML5 video tutorial]
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