Drill Down And Drill Up Events In Drill Down Highchart

Using The Code:

  1. chart: {  
  2.    type: 'column',  
  3.    events: {  
  4.       drillup: function (e) {  
  5.          alert('drill Up');  
  6.       },  
  7.       drilldown: function (e) {  
  8.          alert('drill down');  
  9.       }  
  10.    }  
  11. }  

Here chart is my chart property.