jEasyUI 樹形網(wǎng)格添加分頁

本教程展示如何向帶有動態(tài)加載特性的樹形網(wǎng)格（TreeGrid）添加分頁。

創(chuàng)建樹形網(wǎng)格（TreeGrid）

啟用樹形網(wǎng)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服務(wù)器發(fā)送 'page' 和 'rows' 參數(shù)。

????<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>

服務(wù)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(fā)送到服務(wù)器的參數(shù)包括：

page：要加載的當(dāng)前頁面。
rows：頁面尺寸大小。
id：父行的 id 值，從服務(wù)器返回的行將被添加。

當(dāng)展開一個行節(jié)點時，'id' 值是大于 0 的。當(dāng)改變頁碼時，'id' 值應(yīng)該被設(shè)置為 0 來放置加載子行。

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