The method getrowno returns the row index setguttercolor a grid cell. The argument is a grid element.
var pggrid = new jsgrid();
pggrid.init({
id:"wrp",
rows:5,
columns:12,
width:25,
height:20,
gutter:1,
backgroundColor: "#7fffd4"
});
var rows = pggrid.getrows(2);
var rowno = pggrid.getrowno(rows[5]);
//return 2