本节介绍jQuery EasyUI树形网格（TreeGrid）如何动态的加载。
动态加载树形网格有助于从服务器上加载部分的行数据，避免加载大型数据的长时间等待。
下述的示例将向您展示如何创建带有动态加载特性的树形网格。
<table title="Products" class="easyui-treegrid" style="width:700px;height:300px" url="treegrid3_getdata.php"
rownumbers="true" idField="id" treeField="name">
<thead>
<tr>
<th field="name" width="250">Name</th>
<th field="quantity" width="100" align="right">Quantity</th>
<th field="price" width="150" align="right" formatter="formatDollar">Price</th>
<th field="total" width="150" align="right" formatter="formatDollar">Total</th>
</tr>
</thead>
</table>treegrid3_getdata.php
$id = isset($_POST['id']) ? intval($_POST['id']) : 0;
include 'conn.php';
$result = array();
$rs = mysql_query("select * from products where parentId=$id");
while($row = mysql_fetch_array($rs)){
$row['state'] = has_child($row['id']) ? 'closed' : 'open';
$row['total'] = $row['price']*$row['quantity'];
array_push($result, $row);
}
echo json_encode($result);
function has_child($id){
$rs = mysql_query("select count(*) from products where parentId=$id");
$row = mysql_fetch_array($rs);
return $row[0] > 0 ? true : false;
}