HTML5 attribute draggable specifies whether an element is draggable
Example
A draggable paragraph:
<p draggable="true">这是一个可拖动的段落。</p>
Browser support
IE
Firefox
Chrome
Safari
Opera
Note: Internet Explorer 8 and earlier versions do not support the draggable attribute.
Definition and usageThe draggable attribute specifies whether the element can be dragged. Tip: Links and images are draggable by default. Tip: The draggable attribute is commonly used in drag-and-drop operations. Learn more in our drag and drop tutorial. Differences between HTML 4.01 and HTML5The draggable attribute is new in HTML5. Syntax<element draggable="true|false|auto">Attribute value
| Description | |
| Specifies that the element is draggable. | |
| Specifies that the element cannot be dragged. | |
| Use the browser's default behavior. |
<!DOCTYPE html>
<html class="no-js">
<head>
<meta charset="utf-8">
<title>HTML5-draggable(拖放)</title>
<style type="text/css">
#div1, #div2 {float:left; width:100px; height:35px; margin:10px;padding:10px;border:1px solid #aaaaaa;}
</style>
<script src="js/modernizr.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
/*
* 虽然已经设定了img元素可被拖动，但是浏览器默认地，无法将数据/元素放置到其他元素中。
* 如果有需要设置某些元素可接受被拖动元素，则要阻止它的默认行为，
* 这要通过设置该接收元素的ondragover 事件，调用event.preventDefault() 方法
*/
function allowDrop(ev) {
ev.preventDefault(); //阻止默认行为
//ev.target.id
//此处ev.target是接收元素，通过事件被绑定在哪个元素即可区分
}
/*
* 当该img元素被拖动时，会触发一个ondragstart 事件，该事件调用了一个方法drag(event)。
*/
function drag(ev) {
//ev.dataTransfer.setData() 方法设置被拖数据的数据类型（Text）和值（被拖元素id），
//该方法将被拖动元素的id存储到事件的dataTransfer对象内，ev.dataTransfer.getData()可将该元素取出。
//此处ev.target是被拖动元素
ev.dataTransfer.setData("Text", ev.target.id);
}
/*
* 当被拖元素移动到接收元素，
* 松开鼠标时（即被拖元素放置在接收元素内时）会出发ondrop事件
*/
function drop(ev) {
ev.preventDefault(); //阻止默认行为
var data = ev.dataTransfer.getData("Text"); //将被拖动元素id取出
ev.target.appendChild(document.getElementById(data)); //将被拖动元素添加到接收元素尾部
}
</script>
</head>
<body>
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)">
<!--为了使元素可拖动，把 draggable 属性设置为 true-->
<img src="/static/imghwm/default1.png" data-src="http://www.w3school.com.cn/i/w3school_logo_black.gif" class="lazy" draggable="true" ondragstart="drag(event)" id="drag1" / alt="HTML5 attribute draggable specifies whether an element is draggable" >
</div>
<div id="div2" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
</body>
</html>
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