iv在jqgrid中看到了@Oleg的行总和示例，但我尝试应用它，但它无法正常工作，我有以下网格，我需要为其计算金额值。

colNames: ['ID', 'FTE', 'Workload'],
    colModel: [
                { name: 'ID', index: 'ID', width: 200, align: 'left', hidden: true },

                { name: 'FTEValue', index: 'FTEValue', width: 200, align: 'left', formatter: 'number' },
                { name: 'Workload', index: 'Workload', width: 200, align: 'left' },



    caption: "Activity FTE",
    gridview: true,
    rownumbers: true,
    rownumWidth: 40,
    scroll: 0,
    rowNum: 100,
    sortname: 'ID',
    pager: '#pager',
    sortorder: "asc",
    viewrecords: true,
    autowidth: true,
    height: '100%',
    footerrow: true,
    jsonReader: { root: "GridData", page: "CurrentPage", total: "TotalPages", records: "TotalRecords", repeatitems: false, id: "0" }
};



DutyFTEGrid.prototype.SetupGrid = function (selector) {
    jQuery(selector).html('<table id="grid"></table><div id="pager"></div>');
    var grid = jQuery("#grid").jqGrid(this.gridConfiguration);

    jQuery("#grid").jqGrid('navGrid', '#pager',
    { edit: false, add: false, search: false }, {}, {},
    { // Delete parameters
        ajaxDelOptions: { contentType: "application/json" },
        mtype: "DELETE",
        serializeDelData: function () {
            return ""; 
        },
        onclickSubmit: function (params, postdata) {
            params.url = serviceURL + 'DutyFTE(' + encodeURIComponent(postdata) + ')/';
        }
    });

    var grid = $("#grid");
    var sum = grid.jqGrid('getCol', 'FTE', false, 'sum');
    grid.jqGrid('footerData', 'set', { DriverEn: 'Total FTE:', FTEValue: sum });
};

请奥列格（Oleg）帮助，我已经尝试了您的示例，但是由于某些原因它没有起作用。