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第一信赖
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。
<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; }
启用树形网格的分页特性,必须添加 'pagination:true' 属性,这样页面加载时就会向服务器发送 'page' 和 'rows' 参数。
<table title="Products" class="easyui-treegrid"style="width:700px;height:300px" data-options=" url: 'treegrid4_getdata.php', rownumbers: true, pagination: true, pageSize: 2, pageList: [2,10,20], idField: 'id', treeField: 'name', onBeforeLoad: function(row,param){ if (!row) { // load top level rows param.id = 0; // set id=0, indicate to load new page rows } } "> <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>
treegrid4_getdata.php
$page = isset($_POST['page']) ? intval($_POST['page']) : 1; $rows = isset($_POST['rows']) ? intval($_POST['rows']) : 10; $offset = ($page-1)*$rows; $id = isset($_POST['id']) ? intval($_POST['id']) : 0; include 'conn.php'; $result = array(); if ($id == 0){ $rs = mysql_query("select count(*) from products where parentId=0"); $row = mysql_fetch_row($rs); $result["total"] = $row[0]; $rs = mysql_query("select * from products where parentId=0 limit $offset,$rows"); $items = array(); while($row = mysql_fetch_array($rs)){ $row['state'] = has_child($row['id']) ? 'closed' : 'open'; array_push($items, $row); } $result["rows"] = $items; } else { $rs = mysql_query("select * from products where parentId=$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; }
发送到服务器的参数包括:
当展开一个行节点时,'id' 值是大于 0 的。 当改变页码时,'id' 值应该被设置为 0 来放置加载子行。