SMART datagrid v.1 > Classes > GridBase
If found the sum of data fields which have been specified by parameter field, you can specify
"count", "sum", "max", "min", "avg", "var", "varp", "stdev", "stdevep"
in value to get the sum of corresponding field.
var v = grdMain.getSummary("Quantity", sum);
alert("sum => " + v);