Color contrast setting on dataLabels style parameter - Javascript highcharts

Javascript examples for highcharts:Chart Label

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Description

Color contrast setting on dataLabels style parameter

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Highcharts Demo</title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://code.jquery.com/jquery-2.2.4.js"></script> 
      <script type="text/javascript">
$(function() {//from   w ww  .  j  ava2s . c  o  m
  // override getContrast function
  (function(H) {
    H.Renderer.prototype.getContrast = function(rgba) {
      rgba = H.Color(rgba).rgba;
      return rgba[0] + rgba[1] + rgba[2] > 500 ? '#000000' : '#FFFFFF';
    };
  }(Highcharts));
  Highcharts.chart('container', {
    chart: {
      type: 'column'
    },
    xAxis: {
      categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    plotOptions: {
      series: {
        colorByPoint: true,
        dataLabels: {
          enabled: true,
          inside: true,
          style: {
            fontWeight: 'bold',
            color: "contrast",
            textShadow: false
          }
        }
      }
    },
    series: [{
      data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5,101, 120, 115, 75]
    }]
  });
});

      </script> 
   </head> 
   <body> 
      <script src="https://code.highcharts.com/highcharts.js"></script> 
      <div id="container" style="height: 400px"></div>  
   </body>
</html>

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