EasyUI DataGrid 增加求和行（求本頁數據的和及所有頁數據的和）

分兩種情況：
一種是當前頁的列求和
一種是所有頁的列求和
效果大概如下：

先說第一種：當前頁的列求和
代碼如下：（本段代碼複製於博客：EasyUI datagrid表數據某列總和）

<table id="dg"></table>
<script>
    $(function () {
        $('#dg').datagrid({
            singleSelect: true,
            onLoadSuccess: compute,//加載完畢後執行計算
            url: 'product.json', fitColumns: true, pagination: true, pageSize: 3,
            title: '統計easyui datagrid某列之和顯示在對應列下面',
            width: 400,
            height: 300,
            columns: [[{ field: 'itemid', width: 80, title: 'Item ID' },
            { field: 'productname', width: 100, editor: 'text', title: 'Product Name' },
            { field: 'listprice', width: 80, align: 'right', title: 'List Pirce' },
            { field: 'unitcost', width: 80, align: 'right', title: 'Unit Cost' }]]
        });
    });
    function compute() {//計算函數
        var rows = $('#dg').datagrid('getRows')//獲取當前的數據行
        var ptotal = 0//計算listprice的總和
            , utotal = 0;//統計unitcost的總和
        for (var i = 0; i < rows.length; i++) {
            ptotal += parseFloat(rows[i]['listprice']);
            utotal += parseFloat(rows[i]['unitcost']);
　　　　}
//新增一行顯示統計信息
        $('#dg').datagrid('appendRow', { itemid: '<b>統計：</b>', listprice: ptotal.toFixed(1), unitcost: utotal });
    }
    </script>

附：
表單數據json集
{"total":28,"rows":[
{"productname":"Koi","unitcost":10.00,"listprice":36.50,"itemid":"EST-1"},
{"productname":"Dalmation","unitcost":12.00,"listprice":18.50,"itemid":"EST-10"},
{"productname":"Rattlesnake","unitcost":12.00,"listprice":38.50,"itemid":"EST-11"},
{"productname":"Rattlesnake","unitcost":12.00,"listprice":26.50,"itemid":"EST-12"},
{"productname":"Iguana","unitcost":12.00,"listprice":35.50,"itemid":"EST-13"}
]}

第二種：所有頁的列求和
代碼如下：

<table id="dg"></table>
<script>
    $(function () {
        $('#dg').datagrid({
            singleSelect: true,
            onLoadSuccess: compute,//加載完畢後執行計算
            url: 'product.json', fitColumns: true, pagination: true, pageSize: 3,
            title: '統計easyui datagrid某列之和顯示在對應列下面',
            width: 400,
            height: 300,
            columns: [[{ field: 'itemid', width: 80, title: 'Item ID' },
            { field: 'productname', width: 100, editor: 'text', title: 'Product Name' },
            { field: 'listprice', width: 80, align: 'right', title: 'List Pirce' },
            { field: 'unitcost', width: 80, align: 'right', title: 'Unit Cost' }]]
        });
    });
    function compute() {//計算函數
    //重新請求數據（datagrid數據不是分頁傳過來而是全部數據一起傳過來）
    $.ajax({
        url: "xxx.cs",
        //page頁數1，rows是datagrid的總行數，其他參數和需要獲取行對象的datagrid是一樣的
        data: {
            page: "1", rows: $('#table1').datagrid('getData').total
        },
        type: "get",
        async: false,
        dataType: "json",
        success: function (datas) {
            rows = datas.rows;  //獲取datagird的所有行
        }
    });

    var ptotal = 0//計算listprice的總和
     , utotal = 0;//統計unitcost的總和
    for (var i = 0; i < rows.length; i++) {
        ptotal += parseFloat(rows[i]['listprice']);
        utotal += parseFloat(rows[i]['unitcost']);
    }
    //新增一行顯示統計信息
    $('#dg').datagrid('appendRow', { itemid: '<b>統計：</b>', listprice: ptotal.toFixed(1), unitcost: utotal });
}
</script>


附：
表單數據json集
{"total":28,"rows":[
{"productname":"Koi","unitcost":10.00,"listprice":36.50,"itemid":"EST-1"},
{"productname":"Dalmation","unitcost":12.00,"listprice":18.50,"itemid":"EST-10"},
{"productname":"Rattlesnake","unitcost":12.00,"listprice":38.50,"itemid":"EST-11"},
{"productname":"Rattlesnake","unitcost":12.00,"listprice":26.50,"itemid":"EST-12"},
{"productname":"Iguana","unitcost":12.00,"listprice":35.50,"itemid":"EST-13"}
]}