ChartJS - Show chart data when click

canvas.html

<div style="width: 300px; height: 300px">
  <canvas id="myChart"></canvas>
</div>

ChartJSDrillDown.js

var myNewChart;

var data = {
  datasets: [{
    data: [300, 50, 100],
    backgroundColor: [
      "#F7464A",
      "#46BFBD",
      "#FDB45C"
    ]
  }],
  labels: [
    "Red",
    "Green",
    "Yellow"
  ]
};

$(document).ready(
  function() {
    var canvas = document.getElementById("myChart");
    var ctx = canvas.getContext("2d");
    myNewChart = new Chart(ctx, {
      type: 'pie',
      data: data,
      options: {
       events: ['mousemove','click'],
       onClick: graphClickEvent
    }
    });
  }
);

function graphClickEvent(event, array){
     var activePoints = myNewChart.getElementsAtEvent(event);
     console.log(activePoints);
      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 url = "Label=" + label + "\nValue=" + value;
        console.log(url);
        alert(url);
      }
}