拖放元素
HTML5拖放功能允许用户将元素拖放到另一个位置。放置位置可能是其他应用程序。拖动元素时，鼠标指针跟随该元素的半透明表示。
让我们尝试以下示例以了解其基本工作原理：
例试试这个代码»
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Using Drag and Drop</title>
<script>
function dragStart(e) {
// Sets the operation allowed for a drag source
e.dataTransfer.effectAllowed = "move";
// Sets the value and type of the dragged data
e.dataTransfer.setData("Text", e.target.getAttribute("id"));
}
function dragOver(e) {
// Prevent the browser default handling of the data
e.preventDefault();
e.stopPropagation();
}
function drop(e) {
// Cancel this event for everyone else
e.stopPropagation();
e.preventDefault();
// Retrieve the dragged data by type
var data = e.dataTransfer.getData("Text");
// Append image to the drop box
e.target.appendChild(document.getElementById(data));
}
</script>
<style>
#dropBox {
width: 300px;
height: 300px;
border: 5px dashed gray;
background: lightyellow;
text-align: center;
margin: 20px 0;
color: orange;
}
#dropBox img {
margin: 25px;
}
</style>
</head>
<body>
<h2>Drag and Drop Demo</h2>
<p>Drag and drop the image into the drop box:</p>
<div id="dropBox" ondragover="dragOver(event);" ondrop="drop(event);">
<!--Dropped image will be inserted here-->
</div>
<img src="../images/kites.jpg" id="dragA" draggable="true" ondragstart="dragStart(event);" width="250" height="250" alt="Flying Kites">
</body>
</html>
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