The method getrows returns an array of grid cells of selected rows. The arguments are the index numbers of the selected rows.
var pggrid = new jsgrid();
pggrid.init({
id: "wrp",
rows: 5,
columns: 12,
width: 25,
height: 20,
gutter: 1,
backgroundColor: "#7fffd4"
});
var rows = pggrid.getrows(0, 2, 4);
//set backgroundColor of selected rows
pggrid.setbackgroundcolor(rows, "#bbff00");