title: Highcharts => Getting the id of a point when clicking on a line chart
body: <p>I am building a line chart and I would like, when I click on a point of the line, to display a popup containing some data about this point.
  The issue I try to resolve is to get the id, the series associated with this point or something like that.</p>
  
  <p>Here is my code :</p>
  
  <pre><code>plotOptions: {
        column: {
          pointWidth: 20
        },
  
        series: {
          cursor: 'pointer',
          events: {
            click: function(event) {
              requestData(event.point);
            }
          }
        }
  </code></pre>
  
  <p>I tried</p>
  
  <pre><code>requestData(this.point)
  </code></pre>
  
  <p>,</p>
  
  <pre><code>requestData(this.point.id)
  </code></pre>
  
  <p>also but it doesn't work.</p>
  
  <p>How do we get the id of a point ?</p>
  
  <p>Thanks a lot.</p>