Display data label leader lines on a pie chart - Javascript Chart.js

Javascript examples for Chart.js:Pie Chart

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Description

Display data label leader lines on a pie chart

Demo Code

ResultView the demo in separate window 

<html lang="en">
   <head> 
      <title>Chart.js - Show Dataset Value in Legend</title> 
   </head> 
   <body translate="no"> 
      <div style="width: 30%"> 
         <canvas id="myChart"></canvas> 
      </div> 
      <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
      <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script> 
      <script>
      window.chartColors = {//from  w  w  w.  ja  v a2 s.c  om
  red: 'rgb(255, 99, 132)',
  orange: 'rgb(255, 159, 64)',
  yellow: 'rgb(255, 205, 86)',
  green: 'rgb(75, 192, 192)',
  blue: 'rgb(54, 162, 235)',
  purple: 'rgb(153, 102, 255)',
  grey: 'rgb(231,233,237)'
};
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
  type: 'doughnut',
  data: {
    datasets: [{
      data: [300, 50, 100, 40, 10],
      backgroundColor: [
        window.chartColors.red,
        window.chartColors.orange,
        window.chartColors.yellow,
        window.chartColors.green,
        window.chartColors.blue,
      ],
    }],
    labels: [
      "Red",
      "Orange",
      "Yellow",
      "Green",
      "Blue"
    ]
  },
  options: {
    legend: {
      display: true,
      labels: {
        generateLabels: function(chart) {
          var data = chart.data;
          if (data.labels.length && data.datasets.length) {
            return data.labels.map(function(label, i) {
              var meta = chart.getDatasetMeta(0);
              var ds = data.datasets[0];
              var arc = meta.data[i];
              var custom = arc.custom || {};
              var getValueAtIndexOrDefault = Chart.helpers.getValueAtIndexOrDefault;
              var arcOpts = chart.options.elements.arc;
              var fill = custom.backgroundColor ? custom.backgroundColor : getValueAtIndexOrDefault(ds.backgroundColor, i, arcOpts.backgroundColor);
              var stroke = custom.borderColor ? custom.borderColor : getValueAtIndexOrDefault(ds.borderColor, i, arcOpts.borderColor);
              var bw = custom.borderWidth ? custom.borderWidth : getValueAtIndexOrDefault(ds.borderWidth, i, arcOpts.borderWidth);
              return {
                // here is where we are adding the data values to the legend title
                text: label + " (" + ds.data[i].toLocaleString() + ")",
                fillStyle: fill,
                strokeStyle: stroke,
                lineWidth: bw,
                hidden: isNaN(ds.data[i]) || meta.data[i].hidden,
                index: i // extra data used for toggling the correct item
              };
            });
          } else {
            return [];
          }
        },
      },
    },
  }
});
      //# sourceURL=pen.js
    
      </script>  
   </body>
</html>

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