jQuery Multi Series Area Charts

window.onload = function () {

var options = {
	animationEnabled: true,
	theme: "light2",
	title:{
		text: "Monthly Sales Comparison by Location"
	},
	axisY: {
		title: "Revenue (in Pound Sterling)",
		valueFormatString: "#0",
		includeZero: true,
		suffix: "K",
		prefix: "£"
	},
	legend: {
		cursor: "pointer",
		itemclick: toogleDataSeries
	},
	toolTip: {
		shared: true
    },
	data: [{
		type: "area",
		name: "London",
		markerSize: 5,
		showInLegend: true,
		xValueFormatString: "MMMM",
		yValueFormatString: "£#0K",
		dataPoints: [
			{ x: new Date(2017, 0), y: 12 },
			{ x: new Date(2017, 1), y: 15 },
			{ x: new Date(2017, 2), y: 12 },
			{ x: new Date(2017, 3), y: 17 },
			{ x: new Date(2017, 4), y: 20 },
			{ x: new Date(2017, 5), y: 21 },
			{ x: new Date(2017, 6), y: 24 },
			{ x: new Date(2017, 7), y: 19 },
			{ x: new Date(2017, 8), y: 22 },
			{ x: new Date(2017, 9), y: 25 },
			{ x: new Date(2017, 10), y: 21 },
			{ x: new Date(2017, 11), y: 19 }
		]
	}, {
		type: "area",
		name: "Manchester",
		markerSize: 5,
		showInLegend: true,
		yValueFormatString: "£#0K",
		dataPoints: [
			{ x: new Date(2017, 0), y: 8 },
			{ x: new Date(2017, 1), y: 12 },
			{ x: new Date(2017, 2), y: 9 },
			{ x: new Date(2017, 3), y: 11 },
			{ x: new Date(2017, 4), y: 15 },
			{ x: new Date(2017, 5), y: 12 },
			{ x: new Date(2017, 6), y: 13 },
			{ x: new Date(2017, 7), y: 9 },
			{ x: new Date(2017, 8), y: 7 },
			{ x: new Date(2017, 9), y: 14 },
			{ x: new Date(2017, 10), y: 18 },
			{ x: new Date(2017, 11), y: 14 }
		]
	}]
};
$("#chartContainer").CanvasJSChart(options);

function toogleDataSeries(e) {
	if (typeof (e.dataSeries.visible) === "undefined" || e.dataSeries.visible) {
		e.dataSeries.visible = false;
	} else {
		e.dataSeries.visible = true;
	}
	e.chart.render();
}

}