jQuery EasyUI 树形菜单 – 树形网格添加分页

本节介绍jQuery EasyUI树形网格（TreeGrid）中分页的添加。

下述示例展示如何向带有动态加载特性的树形网格添加分页。

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" class="easyui-treegrid" style=""  
                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：