Highcharts test tool

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<div id="chart-grid"></div>

CSS

.chart {
    width: 350px;
    height: 300px;
}

JavaScript

var json = [{
    "header": "test1",
        "children": [{
        "date": "2015-01-02",
            "count": "36"
    }, {
        "date": "2015-01-03",
            "count": "29"
    }]
}, {
    "header": "test2",
        "children": [{
        "date": "2015-01-02",
            "count": "36"
    }, {
        "date": "2015-01-03",
            "count": "129"
    }]
}];

$(document).ready(function () {

    var options = {
        chart: {
            type: 'scatter'
        },
        title: {
            text: 'test' // Title for the chart
        },
        subtitle: {},
        legend: {
            enabled: true
        },
        tooltip: {
            formatter: function () {
                return 'x: ' + Highcharts.dateFormat('%d/%m/%Y %H:%M:%S', this.x) + '<br>' + 'y: ' + this.y;
            }
        },
        plotOptions: {
            series: {
                //pointStart: pointStart,
                pointInterval: 24 * 3600 * 1000 * 30
            }
        },
        xAxis: {

            type: 'datetime'
        },
        yAxis: {
            minPadding: 0,
            maxPadding: 0,
            gridLineColor: 'rgba(204,204,204,.25)',
            gridLineWidth: 0.5,
            title: {
                text: 'Access Count',
                rotation: 0,
                textAlign: 'right',
                style: {
                    color: 'rgba(0,0,0,.9)',
                }
            },
            labels: {
                style: {
                    color: 'rgba(0,0,0,.9)',
                    fontSize: '9px'
                }
            },
            lineWidth: .5,
            lineColor: 'rgba(0,0,0,.5)',
            tickWidth: .5,
            tickLength: 3,
            tickColor: 'rgba(0,0,0,.75)'
        },
        series: []
    };

    var $chartGrid = $('#chart-grid'),
        title = [],
        serie,
        date,
        name;

    $.each(json, function (i, item) {
        name = 'container-' + i;
        $chartGrid.append('<div...