text: 
  
  $.getJSON('https://www.highcharts.com/samples/data/jsonp.php?filename=world-population-density.json&callback=?', function (data) {
  
      // Initiate the chart
      var chart = Highcharts.mapChart('container', {
  
          title: {
              text: 'Update series'
          },
  
          legend: {
              title: {
                  text: 'Population density per km²'
              }
          },
  
          colorAxis: {
              min: 1,
              max: 1000,
              type: 'logarithmic'
          },
          series: [{
              data: data,
              mapData: Highcharts.maps['custom/world'],
              joinBy: ['iso-a2', 'code'],
              name: 'Population density',
              states: {
                  hover: {
                      color: '#a4edba'
                  }
              },
              tooltip: {
                  valueSuffix: '/km²'
              }
          }]
      });
  
      // Activate the button
      $('#update').click(function () {
          chart.series[0].update({
              name: 'Updated series name',
              borderColor: 'black',
              dashStyle: 'dot'
          });
      });
  });
  