Nestable 可移动拖拽的树型结构的使用(jQuery)

利用jQuery可以制作出很好的树型结构。这里介绍一款最近才找到使用的Nestable

可以拖动。  网页中的效果 http://dbushell.github.com/Nestable/

具体详细介绍的地址下载https://github.com/dbushell/Nestable

精简后的实例：

<?php
if($_POST['tree_data'])
{
	echo '==>'.$_POST['tree_data'].'<pre>';
	print_r(json_decode($_POST['tree_data']));
	echo '</pre>'; die;
}
?>
<style type="text/css">
/**
 * Nestable
 */

.nestable { position: relative; display: block; margin: 0; padding: 0; max-width: 600px; list-style: none; font-size: 13px; line-height: 20px; }

.dd-list { display: block; position: relative; margin: 0; padding: 0; list-style: none; }
.dd-list .dd-list { padding-left: 30px; }
.dd-collapsed .dd-list { display: none; }

.dd-item,
.dd-empty,
.dd-placeholder { display: block; position: relative; margin: 0; padding: 0; min-height: 20px; font-size: 13px; line-height: 20px; }

.dd-handle { display: block; height: 30px; margin: 5px 0; padding: 5px 10px; color: #333; text-decoration: none; font-weight: bold; border: 1px solid #ccc;
    background: #fafafa;
    background: -webkit-linear-gradient(top, #fafafa 0%, #eee 100%);
    background:    -moz-linear-gradient(top, #fafafa 0%, #eee 100%);
    background:         linear-gradient(top, #fafafa 0%, #eee 100%);
    -webkit-border-radius: 3px;
            border-radius: 3px;
    box-sizing: border-box; -moz-box-sizing: border-box;
}
.dd-handle:hover { color: #2ea8e5; background: #fff; }

.dd-item > button { display: block; position: relative; cursor: pointer; float: left; width: 25px; height: 20px; margin: 5px 0; padding: 0; text-indent: 100%; white-space: nowrap; overflow: hidden; border: 0; background: transparent; font-size: 12px; line-height: 1; text-align: center; font-weight: bold; }
.dd-item > button:before { content: '+'; display: block; position: absolute; width: 100%; text-align: center; text-indent: 0; }
.dd-item > button[data-action="collapse"]:before { content: '-'; }

.dd-placeholder,
.dd-empty { margin: 5px 0; padding: 0; min-height: 30px; background: #f2fbff; border: 1px dashed #b6bcbf; box-sizing: border-box; -moz-box-sizing: border-box; }
.dd-empty { border: 1px dashed #bbb; min-height: 100px; background-color: #e5e5e5;
    background-image: -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff), 
                      -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
    background-image:    -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff), 
                         -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
    background-image:         linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff), 
                              linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
    background-size: 60px 60px;
    background-position: 0 0, 30px 30px;
}

.dd-dragel { position: absolute; pointer-events: none; z-index: 9999; }
.dd-dragel > .dd-item .dd-handle { margin-top: 0; }
.dd-dragel .dd-handle {
    -webkit-box-shadow: 2px 4px 6px 0 rgba(0,0,0,.1);
            box-shadow: 2px 4px 6px 0 rgba(0,0,0,.1);
}

</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="jquery.nestable.js"></script>
<script>
$(document).ready(function()
{
    var updateOutput = function(e)
    {
        var list   = e.length ? e : $(e.target), output = list.data('output');
        if (window.JSON) output.val(window.JSON.stringify(list.nestable('serialize')));//, null, 2));
        else output.val('JSON browser support required for this demo.');
    };

    // activate Nestable for list 1
    $('#nestable').nestable({ group: 1 }).on('change', updateOutput);
    
    // output initial serialised data
    updateOutput($('#nestable').data('output', $('#nestable-output')));

    $('#nestable-menu').on('click', function(e)
    {
        var target = $(e.target), action = target.data('action');
        if (action === 'expand-all') $('.nestable').nestable('expandAll');
        if (action === 'collapse-all') $('.nestable').nestable('collapseAll');
    });
});
</script>
</head>
<body>

    <menu id="nestable-menu">
        <button type="button" data-action="expand-all">Expand All</button>
        <button type="button" data-action="collapse-all">Collapse All</button>
    </menu>

    <div class="cf%20nestable-lists">

        <div class="dd%20nestable" id="nestable">
            <ol class="dd-list">
                <li class="dd-item" data-id="1">
                    <div class="dd-handle">Item 1</div>
                </li>
                <li class="dd-item" data-id="2">
                    <div class="dd-handle">Item 2</div>
                    <ol class="dd-list">
                        <li class="dd-item" data-id="3"><div class="dd-handle">Item 3</div></li>
                        <li class="dd-item" data-id="4"><div class="dd-handle">Item 4</div></li>
                        <li class="dd-item" data-id="5">
                            <div class="dd-handle">Item 5</div>
                            <ol class="dd-list">
                                <li class="dd-item" data-id="6"><div class="dd-handle">Item 6</div></li>
                                <li class="dd-item" data-id="7"><div class="dd-handle">Item 7</div></li>
                                <li class="dd-item" data-id="8"><div class="dd-handle">Item 8</div></li>
                            </ol>
                        </li>
                        <li class="dd-item" data-id="9"><div class="dd-handle">Item 9</div></li>
                        <li class="dd-item" data-id="10"><div class="dd-handle">Item 10</div></li>
                    </ol>
                </li>
                <li class="dd-item" data-id="11">
                    <div class="dd-handle">Item 11</div>
                </li>
                <li class="dd-item" data-id="12">
                    <div class="dd-handle">Item 12</div>
                </li>
            </ol>
        </div>

    </div>

    <p><strong>Serialised Output (per list)</strong></p>

	<form method="post">
    	<textarea id="nestable-output" name="tree_data" style="width:400px;height:240px;"></textarea>
    	<input type="submit" />
	</form>