看到一个不错的jquery插件，可拖动DIV，顺序可保存到数据库的一个实例：这里就以其中PHP实例简单说明一下：
<?php
//post到后台的数据
if ($_POST) {
$ids = $_POST["ids"];
for ($idx = 0; $idx < count($ids); $idx+=1) {
$id = $ids[$idx];
$ordinal = $idx;
//...
}
return;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
body { font-family:Arial; font-size:12pt; padding:20px; width: 800px; margin:20px auto; border:solid 1px black; }
h1 { font-size:16pt; }
h2 { font-size:13pt; }
ul { width:350px; list-style-type: none; margin:0px; padding:0px; }
li { float:left; padding:5px; width:100px; height:100px; }
li div { width:90px; height:50px; border:solid 1px black; background-color:#E0E0E0; text-align:center; padding-top:40px; }
.placeHolder div { background-color:white!important; border:dashed 1px gray !important; }
</style>
</head>
<body>
<div>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<h1>jQuery List DragSort PHP Example</h1>
<a href="http://www.1sucai.cn/">Homepage</a><br/>
<br/>
<h2>Save list order with ajax:</h2>
<ul id="gallery">
<?php
$list = array("blue", "orange", "brown", "red", "yellow", "green", "black", "white", "purple");
for ($idx = 0; $idx < count($list); $idx+=1) {
echo "<li data-itemid='" . $idx . "'>";
echo "<div>" . $list[$idx] . "</div>";
echo "</li>";
}
?>
</ul>
<script type="text/javascript" src="jquery.dragsort-0.5.1.min.js"></script>
<script type="text/javascript">
//saveOrder为回调函数
$("#gallery").dragsort({ dragSelector: "div", dragEnd: saveOrder, placeHolderTemplate: "<li class='placeHolder'><div></div></li>" });
function saveOrder() {
var data = $("#gallery li").map(function() { return $(this).data("itemid"); }).get();
//通过ajax模拟post的方式,post格式形式为：[0, 1, 2, 5, 4, 3, 8, 6, 7]
$.post("example.php", { "ids[]": data });
};
</script>
<div style="clear:both;"></div>
</div>
</body>
</html>
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