jquery实现可拖动DIV自定义保存到数据的实例

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;  
    }  
?>  

复制代码代码如下:

<!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.jb51.net/">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>  