jQuery EasyUI Tree Menu - Tree Grid adds peddling

jQuery EasyUI Tree Menu - Tree Grid Adds peddling

This section describes the addition of paged pages in the jQuery EasyUI Tree Grid.

The following example shows how to add peddling to a tree mesh with dynamic loading characteristics.

Create a TreeGrid

To enable the pagination feature of TreeGrid, you must add the 'pagination:true' property so that the 'page' and 'rows' parameters are sent 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: Page size.
• id: The id value of the parent row, the row returned from the server, is added.

When a row node is expanded, the 'id' value is greater than 0. W hen changing the page number, the 'id' value should be set to 0 to place the load sub-row.

Download the jQuery EasyUI instance

jeasyui-tree-treegrid4.zip