Make font size of labels in charts.js responsive - Javascript Chart.js

Javascript examples for Chart.js:Chart Configuration

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Description

Make font size of labels in charts.js responsive

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Data labels responsive font</title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/chart.js@2.7.1/dist/Chart.min.js"></script> 
      <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@0.2.0"></script> 
      <script type="text/javascript">
    window.onload=function(){//from ww  w. j a  va 2  s. c o m
var labels = [0,1,2,3,4,5,6,7,8,9];
var data = [0,1,2,3,2,3,0.5,8,4,2];
var chart = new Chart('chart', {
  type: 'bar',
  data: {
    labels: labels,
    datasets: [{
      backgroundColor: '#ccddee',
      borderColor: '#5566aa',
      data: data
    }]
  },
  options: {
     legend: false,
    tooltip: false,
    layout: {
       padding: 24
    },
    plugins: {
      datalabels: {
        anchor: 'end',
        align: 'end',
        backgroundColor: null,
        borderColor: null,
        borderRadius: 4,
        borderWidth: 1,
        color: '#223388',
        font: function(context) {
          var width = context.chart.width;
          var size = Math.round(width / 32);
           return {
             size: size,
            weight: 600
          };
        },
        offset: 4,
        padding: 0,
        formatter: function(value) {
           return Math.round(value * 10) / 10
        }
      }
    }
  }
});
    }

      </script> 
   </head> 
   <body> 
      <div class="wrapper"> 
         <canvas id="chart"></canvas> 
      </div>  
   </body>
</html>

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