SMART datagrid v.1 > Classes > ColumnSummary

DataLudi.ColumnSummary.summaryCallback  property

The callback function which calculates and returns the value to be displayed in the sum cell such as column Footer, etc. 

function (column:ValueColumn, group:GroupRow):Number;

Differently from callback or expression, this callback function will be called when the sum calculation such as data change or filtering is required again. 

group parameter is GroupRow object which will be transferred only when it is called from row group footer. If specify this property, expression or callback will be ignored. 

Getter

function summaryCallback(): Function

Setter

function setSummaryCallback(value: Function)

    column.footer().setSummaryCallback(function (column) {
        var grid = column.grid();
        var fld = column.dataIndex();
        var fld2 = grid.dataSource().getFieldIndex('UnitPrice');
        var v = 0;
        for (var i = grid.rowCount(); i--;) {
            v += grid.getValueAt(i, fld) + grid.getValueAt(i, fld2);
        }
        return v;
    });

    column.groupFooter().setSummaryCallback(function (column, group) {
        var grid = column.grid();
        var fld = column.dataIndex();
        var v = 0;
        for (var i = group.count(); i--;) {
            var row = group.getChild(i);
            if (row.dataIndex() >= 0) {
                v += group.getChild(i).getValue(fld);
            }
        }
        return v;
    });

Note

• If callback function returns NaN, it will consider not have calculated the sum and call the callback again whenever it should display in the cell.

See Also

callback

expression

GroupRow

Examples

Column Footer Callbacks

Column Footer