Chart.js doughnut tooltip percentages usage - Javascript Chart.js

Javascript examples for Chart.js:Chart Tooltip

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Description

Chart.js doughnut tooltip percentages usage

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> 
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.3/Chart.bundle.js"></script> 
      <script type="text/javascript">
    window.onload=function(){// w ww.  j  a v  a  2s . com
var randomScalingFactor = function() {
  return Math.round(Math.random() * 100);
};
var randomColorFactor = function() {
  return Math.round(Math.random() * 255);
};
var randomColor = function(opacity) {
  return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
};
var config = {
  type: 'doughnut',
  data: {
    datasets: [{
      data: [
        486.5,
        501.5,
        139.3,
        162,
        263.7,
      ],
      backgroundColor: [
        "#F7464A",
        "#46BFBD",
        "#FDB45C",
        "#949FB1",
        "#4D5360",
      ],
      label: 'Expenditures'
    }],
    labels: [
      "Hospitals: $486.5 billion",
      "Physicians & Professional Services: $501.5 billion",
      "Long Term Care: $139.3 billion",
      "Prescription Drugs: $162 billion",
      "Other Expenditures: $263.7 billion"
    ]
  },
  options: {
    responsive: true,
    legend: {
      position: 'bottom',
    },
    title: {
      display: false,
      text: 'Chart.js Doughnut Chart'
    },
    animation: {
      animateScale: true,
      animateRotate: true
    },
    tooltips: {
      callbacks: {
        label: function(tooltipItem, data) {
           var dataset = data.datasets[tooltipItem.datasetIndex];
          var total = dataset.data.reduce(function(previousValue, currentValue, currentIndex, array) {
            return previousValue + currentValue;
          });
          var currentValue = dataset.data[tooltipItem.index];
          var precentage = Math.floor(((currentValue/total) * 100)+0.5);
          return precentage + "%";
        }
      }
    }
  }
};
var ctx = document.getElementById("chart-area").getContext("2d");
window.myDoughnut = new Chart(ctx, config); {
}
    }

      </script> 
   </head> 
   <body> 
      <div id="canvas-holder" style="width:75%"> 
         <canvas id="chart-area"></canvas> 
      </div>  
   </body>
</html>

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