jQuery EasyUI 树形菜单 – 树形网格添加分页

本教程展示如何向带有动态加载特性的树形网格(TreeGrid)添加分页。

创建树形网格(TreeGrid)

启用树形网格(TreeGrid)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\" 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>

服务器端代码

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:

  • page:要加载的当前页面。
  • rows:页面尺寸大小。
  • id:父行的 id 值,从服务器返回的行将被添加。

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。

下载 jQuery EasyUI 实例

jeasyui-tree-treegrid4.zip