toOptionsJSON method
Implementation
@override
void toOptionsJSON(StringBuffer buffer) {
super.toOptionsJSON(buffer);
if (index != null) {
buffer.writeAll(['"index":', jsonEncode(index), ','], '');
}
if (period != null) {
buffer.writeAll(['"period":', jsonEncode(period), ','], '');
}
if (periods != null) {
buffer.write('"periods":[');
for (var item in periods!) {
buffer.writeAll([jsonEncode(item), ','], '');
}
buffer.write('],');
}
}