Using JSON in highcharts column, clickable

Using HIGHCHARTS , fed by JSON and traversing the nodes to get the data required to make the chart

HTML

<script type="text/javascript" src="http://highcharts.com/js/testing.js"></script>


        <div id="departchart" style="width: 430px; height: 250px; margin: 0 auto;"></div>

JavaScript

var chart;
$(function () {
//Second chart    
    options1 = {
                chart: {
                    //inverted: true,
                    backgroundColor: 'transparent',
                    renderTo: 'departchart',
                    defaultSeriesType: 'column'
                },
                title: {
                    text: '12 Month Projection'
                },
                subtitle: {
                    text: ''
                },
                legend: {
                    layout: 'vertical',
                    backgroundColor: '#FFFFFF',
                    align: 'left',
                    verticalAlign: 'top',
                    x: 100,
                    y: 70,
                    floating: true,
                    shadow: true
                },
                xAxis: {
                     //type: 'month',
                   // categories: [],
                    categories: []
                },
                yAxis: {  
                    min: 0,
                    title: {
                        text: 'Departures'
                    }
                },
                tooltip: {
                    formatter: function () {
                        return '' + this.y + ' items';
                    }
                },
                plotOptions: {
                    column: {
                        pointPadding: 0.2,
                        borderWidth: 0
                    },
                        series: {
                            cursor: 'pointer',
                            point: {
                                events: {
                                    click: function () {
                                     alert("Trigger Booking list for month of " + this.category + ". ");
                                    }
                                }
                            }
                        }
                },
        series: [{}]
            }
 aData =...