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HTML 

              
                <script src="//www.amcharts.com/lib/4/core.js"></script>
<script src="//www.amcharts.com/lib/4/charts.js"></script>
<script src="//www.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>
!

CSS 

              
                body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 300px;
}
!

JS 

              
                /**
 * --------------------------------------------------------
 * This demo was created using amCharts V4 preview release.
 *
 * V4 is the latest installement in amCharts data viz
 * library family, to be released in the first half of
 * 2018.
 *
 * For more information and documentation visit:
 * https://www.amcharts.com/docs/v4/
 * --------------------------------------------------------
 */

// Define nulti-level data
var data = [
  {
    from: "A",
    to: "D",
    value: 10,
    sub: [
      { from: "A1", to: "D1", value: 2 },
      {
        from: "A2",
        to: "D2",
        value: 5,
        sub: [
          { from: "A1-1", to: "D1-1", value: 1 },
          { from: "A1-1", to: "D1-2", value: 1 },
          { from: "A1-2", to: "D1-2", value: 2 },
          { from: "A1-2", to: "D1-3", value: 1 }
        ]
      },
      { from: "A3", to: "D2", value: 3 }
    ]
  },
  {
    from: "B",
    to: "D",
    value: 8,
    sub: [
      { from: "B1", to: "D1", value: 2 },
      { from: "B2", to: "D2", value: 2 },
      { from: "B3", to: "D2", value: 3 },
      { from: "B4", to: "D2", value: 1 }
    ]
  },
  {
    from: "B",
    to: "E",
    value: 4,
    sub: [
      { from: "B1", to: "E1", value: 2 },
      { from: "B2", to: "E2", value: 1 },
      { from: "B2", to: "E3", value: 1 }
    ]
  },
  {
    from: "C",
    to: "E",
    value: 3,
    sub: [
      { from: "C1", to: "E1", value: 2 },
      { from: "C1", to: "E2", value: 1 }
    ]
  }
];

am4core.useTheme(am4themes_animated);

var chart = am4core.create("chartdiv", am4charts.SankeyDiagram);
chart.data = data;
chart.dataFields.fromName = "from";
chart.dataFields.toName = "to";
chart.dataFields.value = "value";

// for right-most label to fit
chart.paddingRight = 40;
chart.paddingBottom = 25;

// Add events on links
chart.links.template.cursorOverStyle = am4core.MouseCursorStyle.pointer;
chart.links.template.events.on("hit", function(ev) {
  chart.colors.reset();
  var linkData = ev.target.dataItem.dataContext;
  if (linkData.sub) {
    chart.data = linkData.sub;
  }
});
!
999px

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