How to drill down charts with ChartJS?

drilldown.js

// https://stackoverflow.com/questions/51609922/how-to-drill-down-charts-with-chartjs
// https://stackoverflow.com/questions/26257268/click-events-on-pie-charts-in-chart-js
$(document).ready(function() {
      var canvas = document.getElementById("myChart");
      var ctx = canvas.getContext("2d");
      var myNewChart = new Chart(ctx, {
         type: 'pie',
         data: data
      });

      canvas.onclick = function(evt) {
      var activePoints = myNewChart.getElementsAtEvent(evt);
      if (activePoints[0]) {
         var chartData = activePoints[0]['_chart'].config.data;
         var idx = activePoints[0]['_index'];

         var label = chartData.labels[idx];
         var value = chartData.datasets[0].data[idx];
         var color = chartData.datasets[0].backgroundColor[idx]; //Or any other data you wish to take from the clicked slice

         alert(label + ' ' + value + ' ' + color); //Or any other function you want to execute. I sent the data to the server, and used the response i got from the server to create a new chart in a Bootstrap modal.
       }
     };
  });