<html>
<head>
<style>
.droptarget {
float: left;
width: 100px;
height: 35px;
margin: 15px;
padding: 10px;
border: 1px solid #aaaaaa;
}
</style>
</head>
<body>
<p>该实例演示了如何使用 addEventListener() 方法向文档对象添加 "ondragstart", "ondrag", "ondragover" 和 "ondrop" 事件。 </p>
<p>在两个矩形框中来回拖动 p 元素:</p>
<div class="droptarget">
<p draggable="true" id="dragtarget">Drag me!</p>
</div>
<div class="droptarget"></div>
<p style="clear:both;"><strong>注意：</strong>Internet Explorer 8 及更早 IE 版本或 Safari 5.1 及更早版本的浏览器不支持 drag 事件。</p>
<p id="demo"></p>
<script>
/* Events fired on the drag target */
document.addEventListener("dragstart", function(event) {
event.dataTransfer.setData("Text", event.target.id);
document.getElementById("demo").innerHTML = "开始拖动 p 元素";
});
document.addEventListener("dragend", function(event) {
document.getElementById("demo").innerHTML = "完成 p 元素的拖动";
});
/* Events fired on the drop target */
document.addEventListener("dragover", function(event) {
event.preventDefault();
});
document.addEventListener("drop", function(event) {
event.preventDefault();
if ( event.target.className == "droptarget" ) {
var data = event.dataTransfer.getData("Text");
event.target.appendChild(document.getElementById(data));
}
});
</script>
</body>
</html>