highcharts - render bar graph with table data

JQuery highcharts - render bar graph with table data

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<div id="container" style="min-width: 400px; height: 400px; margin: 0 auto"></div>

<table class="table" id="datatable">
    <thead>
        <tr>
            <th></th>
            <th>Travellers</th>
 
        </tr>
    </thead>
    <tbody>
        <tr>
            <th>jan</th>
            <td>3</td>
        
        </tr>
        <tr>
            <th>Feb</th>
            <td>2</td>
         
        </tr>
        <tr>
            <th>Mar</th>
            <td>5</td>
       
        </tr>
        <tr>
            <th>Apr</th>
            <td>1</td>
         
        </tr>
        <tr>
            <th>May</th>
            <td>2</td>
           
        </tr>
    </tbody>
</table>

CSS

#datatable{display:block;}

JavaScript

$(function () {

    $(document).ready(function() {
    
        Highcharts.visualize = function(table, options) {
            // the categories
            options.xAxis.categories = [];
            $('tbody th', table).each( function(i) {
                options.xAxis.categories.push(this.innerHTML);
            });
    
            // the data series
            options.series = [];
            $('tr', table).each( function(i) {
                var tr = this;
                $('th, td', tr).each( function(j) {
                    if (j > 0) { // skip first column
                        if (i == 0) { // get the name and init the series
                            options.series[j - 1] = {
                                name: this.innerHTML,
                                data: []
                            };
                        } else { // add values
                            options.series[j - 1].data.push(parseFloat(this.innerHTML));
                        }
                    }
                });
            });
    
            var chart = new Highcharts.Chart(options);
        }
    
        var table = document.getElementById('datatable'),
        options = {
            chart: {
                renderTo: 'container',
                type: 'column'
            },
            title: {
                text: 'Title of Graph'
            },
            xAxis: {
            },
            yAxis: {
                title: {
                    text: 'People departing'
                }
            },
            tooltip: {
                formatter: function() {
                    return '<b>'+ this.series.name +'</b><br/>'+
                        this.y +' '+ this.x.toLowerCase();
                }
            }
        };
    
        Highcharts.visualize(table, options);
    });
    
});