set fixed y-axis to spline chart and update every second - Javascript highcharts

Javascript examples for highcharts:Line Chart

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Description

set fixed y-axis to spline chart and update every second

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Highcharts Demo</title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
   </head> 
   <body> 
      <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script> 
      <script src="https://code.highcharts.com/highcharts.js"></script> 
      <script src="https://code.highcharts.com/modules/exporting.js"></script> 
      <script src="https://code.highcharts.com/modules/export-data.js"></script> 
      <div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div> 
      <script type="text/javascript">
Highcharts.setOptions({/*  w w w . j a va2s  . c  o  m*/
    global: {
        useUTC: false
    }
});
Highcharts.chart('container', {
    chart: {
        type: 'spline',
        animation: Highcharts.svg, // don't animate in old IE
        marginRight: 10,
        events: {
            load: function () {
                // set up the updating of the chart each second
                var series = this.series[0];
                setInterval(function () {
                    var x = (new Date()).getTime(), // current time
                        y = Math.random();
                    series.addPoint([x, y], true, true);
                }, 1000);
            }
        }
    },
    title: {
        text: 'Live random data'
    },
    xAxis: {
        type: 'datetime',
        tickPixelInterval: 150
    },
    yAxis: {
          min: 0.25,
        max: 0.75,
        startOnTick: false,
        endOnTick: false,
        title: {
            text: 'Value'
        },
        plotLines: [{
            value: 0,
            width: 1,
            color: '#808080'
        }]
    },
    tooltip: {
        formatter: function () {
            return '<b>' + this.series.name + '</b><br/>' +
                Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>' +
                Highcharts.numberFormat(this.y, 2);
        }
    },
    legend: {
        enabled: false
    },
    exporting: {
        enabled: false
    },
    series: [{
        name: 'Random data',
        data: (function () {
            // generate an array of random data
            var data = [],
                time = (new Date()).getTime(),
                i;
            for (i = -19; i <= 0; i += 1) {
                data.push({
                    x: time + i * 1000,
                    y: Math.random()
                });
            }
            return data;
        }())
    }]
});

      </script>  
   </body>
</html>

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