Show Marker symbol on the newest data for line chart - Javascript highcharts

Javascript examples for highcharts:Line Chart

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Description

Show Marker symbol on the newest data for line chart

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-1.9.1.js"></script> 
      <script type="text/javascript">
$(function() {//from   w  ww  . jav a2s  .co  m
  $(document).ready(function() {
    Highcharts.setOptions({
      global: {
        useUTC: false
      }
    });
    $('#container').highcharts({
      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],
              len = series.data.length - 1,
              lastPoint = series.data[len];
            lastPoint.update({
              marker: {
                enabled: true
              }
            });
            setInterval(function() {
              var x = (new Date()).getTime(), // current time
                y = Math.random();
              len = series.data.length - 1;
              series.data[len].update({
                marker: {
                  enabled: false
                }
              }, false);
              series.addPoint([x, y], true, true);
              len = series.data.length - 1;
              series.data[len].update({
                marker: {
                  enabled: true
                }
              }, true);
            }, 1000);
          }
        }
      },
      title: {
        text: 'Live random data'
      },
      xAxis: {
        type: 'datetime',
        tickPixelInterval: 150
      },
      yAxis: {
        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
      },
      plotOptions: {
        series: {
          marker: {
            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> 
   </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: 310px; height: 400px; margin: 0 auto"></div>  
   </body>
</html>

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