jQuery EasyUI 樹形菜單 - 樹形網格添加分頁

本教程展示如何向帶有動態加載特性的樹形網格(TreeGrid)添加分頁。

創建樹形網格(TreeGrid)

啟用樹形網格(TreeGrid)的分頁特性,必須添加 'pagination:true' 屬性,這樣頁面加載時就會向伺服器發送 'page' 和 'rows' 參數。

    <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>

伺服器端代碼

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;
}

發送到伺服器的參數包括:

  • page:要加載的當前頁面。
  • rows:頁面尺寸大小。
  • id:父行的 id 值,從伺服器返回的行將被添加。

當展開一個行節點時,'id' 值是大於 0 的。 當改變頁碼時,'id' 值應該被設置為 0 來放置加載子行。

下載 jQuery EasyUI 實例

jeasyui-tree-treegrid4.zip