Showing Legend in multi series chart improves the readability. Spline Chart, as any other graph in library supports Legends. Chart Legend provides short description of Data being rendered which helps in easy identification of each data series in the chart. The given example shows multi series chart with Legends. It also contains source code that you can edit in-browser or save to run it locally.
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
animationEnabled: true,
exportEnabled: true,
title:{
text: "Gold Medals Won in Olympics"
},
axisY:{
title: "Number of Medals"
},
toolTip: {
shared: true
},
legend:{
cursor:"pointer",
itemclick: toggleDataSeries
},
data: [{
type: "spline",
name: "US",
showInLegend: true,
dataPoints: [
{ label: "Atlanta 1996" , y: 44 },
{ label:"Sydney 2000", y: 37 },
{ label: "Athens 2004", y: 36 },
{ label: "Beijing 2008", y: 36 },
{ label: "London 2012", y: 46 },
{ label: "Rio 2016", y: 46 }
]
},
{
type: "spline",
name: "China",
showInLegend: true,
dataPoints: [
{ label: "Atlanta 1996" , y: 16 },
{ label:"Sydney 2000", y: 28 },
{ label: "Athens 2004", y: 32 },
{ label: "Beijing 2008", y: 48 },
{ label: "London 2012", y: 38 },
{ label: "Rio 2016", y: 26 }
]
},
{
type: "spline",
name: "Britain",
showInLegend: true,
dataPoints: [
{ label: "Atlanta 1996" , y: 1 },
{ label:"Sydney 2000", y: 11 },
{ label: "Athens 2004", y: 9 },
{ label: "Beijing 2008", y: 19 },
{ label: "London 2012", y: 29 },
{ label: "Rio 2016", y: 27 }
]
},
{
type: "spline",
name: "Russia",
showInLegend: true,
dataPoints: [
{ label: "Atlanta 1996" , y: 26 },
{ label:"Sydney 2000", y: 32 },
{ label: "Athens 2004", y: 28 },
{ label: "Beijing 2008", y: 22 },
{ label: "London 2012", y: 20 },
{ label: "Rio 2016", y: 19 }
]
},
{
type: "spline",
name: "S Korea",
showInLegend: true,
dataPoints: [
{ label: "Atlanta 1996" , y: 7 },
{ label:"Sydney 2000", y: 8 },
{ label: "Athens 2004", y: 9 },
{ label: "Beijing 2008", y: 13 },
{ label: "London 2012", y: 13 },
{ label: "Rio 2016", y: 9 }
]
},
{
type: "spline",
name: "Germany",
showInLegend: true,
dataPoints: [
{ label: "Atlanta 1996" , y: 20 },
{ label:"Sydney 2000", y: 13 },
{ label: "Athens 2004", y: 13 },
{ label: "Beijing 2008", y: 16 },
{ label: "London 2012", y: 11 },
{ label: "Rio 2016", y: 17 }
]
}]
});
chart.render();
function toggleDataSeries(e) {
if(typeof(e.dataSeries.visible) === "undefined" || e.dataSeries.visible) {
e.dataSeries.visible = false;
}
else {
e.dataSeries.visible = true;
}
chart.render();
}
}
You can enable legends using showInLegend property. You can also change text displayed in Legend using legendText. legendMarkerType changes the type of marker for that dataSeries. Some other customizations include legendMarkerColor, legendMarkerBorderThickness, legendSize, etc.