Zero Centered on Y-Axis with Negative Values in area chart - Javascript highcharts

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Description

Zero Centered on Y-Axis with Negative Values in area chart

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://code.jquery.com/jquery-1.9.1.js"></script> 
      <script type="text/javascript">
$(function () {//from w  w  w. ja va  2s.co m
        $('#container').highcharts({
            chart: {
                type: 'area'
            },
            title: {
                text: 'Area chart with negative values'
            },
            yAxis: {
            },
            credits: {
                enabled: false
            },
            series: [{
                name: 'Joe',
                data: [-2, -2, -1, 0, 1, 2, 2, 3, 5, 6, 7, 5, 3, 2, 1, 0, -1 -2, -1, 0]
            }]
        },function(chart) {
            var dExt;
            var ext = chart.yAxis[0].getExtremes();
            var dMax = Math.abs(ext.dataMax);
            var dMin = Math.abs(ext.dataMin);
            dMax >= dMin ? dExt = dMax : dExt = dMin;
            var min = 0 - dExt;
            chart.yAxis[0].setExtremes(min, dExt);
        });
    });

      </script> 
   </head> 
   <body> 
      <script src="https://code.highcharts.com/highcharts.js"></script> 
      <script src="https://code.highcharts.com/modules/exporting.js"></script> 
      <div id="container" style="min-width: 400px; height: 400px; margin: 0 auto"></div>  
   </body>
</html>

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