Generally, to add an additional graph to a chart you should use the addSeries method.
As a parameter, the method takes an object of the graph you'd like to add to the chart. The graph is specified in a standard way.
Single graph
var barChart = new dhtmlXChart({
view:"bar",
container:"chartBox",
value:"#sales#",
color: "#58dccd",
xAxis:{ template:"'#year#" }
});
Multiple graphs
var barChart = new dhtmlXChart({..});
barChart.addSeries({
view: "line",
item:{ radius:0 },
line:{ color:"#36abee" },
value:"#sales3#"
});
If you add to the chart a graph of the same type, you can omit the view attribute:
Single graph
var barChart = new dhtmlXChart({
view:"bar",
container:"chartBox",
value:"#sales#",
xAxis:{ template:"'#year#" }
});
Multiple graphs
var barChart = new dhtmlXChart({..});
barChart.addSeries({
value:"#sales2#",
color:"#a7ee70"
});