Return the xAxis category on click

I can't seem to get the category from Highchart returned on the click event on the chart itself. In other words, this works great:

plotOptions: { 
  series: { 
    events: { 
      click: function(ev) {
        console.log(ev.point.category); // outputs category
      }
    }
  }
}

      

        
        
        
      

    

However, I would like to get a category when the user clicks anywhere in the chart, not just. It will look something like this.

chart: { 
  events: {
    click: function(ev) {
      console.log(ev.xAxis[0].category); // undefined because doesn't exist - sure would be nice, tho
    }
  }
}

      

        
        
        
      

    

I've checked both objects and highcharts objects here, but couldn't find how to determine which category is associated with the return x value.