Update Chart

src/ts/chart.ts

@@ -8,7 +8,7 @@ export abstract class Chart {
         containerHeight: number;
         margin: { top: number; right: number; bottom: number; left: number; };
     };
-    protected data: any[];
+    public data: any[];
     protected width: number;
     protected height: number;
     protected svg: d3.Selection<d3.BaseType, unknown, HTMLElement, any>;
@@ -19,7 +19,7 @@ export abstract class Chart {
     /**
      * Class constructor with basic chart configuration
      */
-    constructor(_config: ChartConfiguration, _data: any[]) {
+    constructor(_config: ChartConfiguration, _data?: any[]) {
 
         const vis = this;
 
@@ -31,7 +31,7 @@ export abstract class Chart {
             containerHeight: height,
             margin: _config.margin || vis.getDefaultMargins()
         };
-        vis.data = _data;
+        vis.data = _data || [];
         vis.initChart();
     }