Two charts as one chart object

by jlbriggs

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/highcharts-more.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="width:500px;height:375px;margin:1.5em 1em;"></div>

<script>
var d          = new Date();
var pointStart = d.getTime();
Highcharts.setOptions({
    global: {
        useUTC:false
    },
    colors: [
        'rgba( 0,   154, 253, 0.9 )', //bright blue
        'rgba( 253, 99,  0,   0.9 )', //bright orange
        'rgba( 40,  40,  56,  0.9 )', //dark
        'rgba( 253, 0,   154, 0.9 )', //bright pink
        'rgba( 154, 253, 0,   0.9 )', //bright green
        'rgba( 145, 44,  138, 0.9 )', //mid purple
        'rgba( 45,  47,  238, 0.9 )', //mid blue
        'rgba( 177, 69,  0,   0.9 )', //dark orange
        'rgba( 140, 140, 156, 0.9 )', //mid
        'rgba( 238, 46,  47,  0.9 )', //mid red
        'rgba( 44,  145, 51,  0.9 )', //mid green
        'rgba( 103, 16,  192, 0.9 )'  //dark purple
    ],
    chart: {
        alignTicks:false,
        type:'',
        
        //borderRadius:10,
        //borderWidth:1,
        //borderColor:'rgba(156,156,156,.25)',
        //backgroundColor:'rgba(204,204,204,.25)',
        //plotBackgroundColor:'rgba(255,255,255,1)',
        style: {
            fontFamily: 'Abel,serif'
        }
    },
    title: {
        text:'Test Chart Title',
        align:'left',
        margin:10,
        x: 50,
        style: {
            fontWeight:'bold',
            color:'rgba(0,0,0,.9)'
        }
    },
    subtitle: {
        text:'Test Chart Subtitle',   
        align:'left',
        x: 52,
    },
    legend: { enabled: true },
    plotOptions: {
        area: {
            lineWidth:1,
            marker: {
                enabled:false,
                symbol:'circle',
                radius:4
            }
        },
        arearange: {
            lineWidth:1
        },
        areaspline: {
     ...

CSS

@import url(https://fonts.googleapis.com/css?family=Changa+One|Loved+by+the+King|Fredericka+the+Great|Droid+Serif:400,700,400italic|Abel|Oswald:400,300,700);

body {
    font-family:Abel, Calibri, Helvetica, sans-serif;
    font-size:95%;
}

JavaScript

var chart;
$(function() {
    $('#container').highcharts({
        chart       : { margin:[60,25,90,90], type: 'area' },
        title       : { },
        subtitle    : { },
        legend      : { enabled : true },
        tooltip     : { },
        plotOptions : {
            series  : {
                pointStart      : pointStart,
                pointInterval   : 3600 * 1000,
            }
        },
        xAxis      : [{ 
            type: 'datetime',
            offset: -120    
        },{
            type: 'datetime',
        }],
        yAxis      : [{ 
            title: { text: 'Y Axis 0' },
            height:100        
        },{
            title: { text: 'Y Axis 1' },
            offset: 0,
            top: 200,
            height:100
        }]
    });	
    chart = $('#container').highcharts();

    chart.addSeries({ 
        xAxis: 0,
        yAxis: 0,
        data: randomData(50) 
    });
    chart.addSeries({ 
        xAxis: 1,
        yAxis: 1,
        data: randomData(150, true, 10) 
    });
    
})