jQuery EasyUI Tree Menu - TreeGrid Add Pagination

This tutorial demonstrates how to add pagination to a TreeGrid with dynamic loading features.

Create TreeGrid

To enable pagination for the TreeGrid, you must add the 'pagination:true' attribute, which will send 'page' and 'rows' parameters to the server when the page loads.

<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>

Server-side Code

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;
}

Parameters sent to the server include:

• page: The current page to load.

• rows: The page size.

• id: The id value of the parent row, the returned rows will be added.

When expanding a row node, the 'id' value is greater than 0. When changing the page number, the 'id' value should be set to 0 to prevent loading child rows.

Download jQuery EasyUI Example

jeasyui-tree-treegrid4.zip