Drilling down for data with the point click event

So far we have only fiddled with the top countries ordered by gold medals. Let's see how we can use a Highcharts event to navigate other charts in jQuery Mobile. Back to the pageinit handler code for chart_page, we declared the variable pointEvt, which is a click event handler shared by all the series in gold medal charts. The following code is for the event:

 var pointEvt = {
     events: {
         click: function(evt) {
             document.location.href = './sport.html?country=' 
             // Country code or name
             + encodeURIComponent(this.category) + 
             // Medal color
             '&color=' + this.series.name;
         }
     }
 };

This event is triggered by touching a bar in a column chart or a slice in a pie chart. As a result, it loads a new document page with a bar chart. The URL for the document page is built inside the handler with the selected country code and the medal color as parameters. The this...