Basic line

author(s): Torstein Hønsi

by oysteinmoseng

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/series-label.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>
<script src="https://code.highcharts.com/themes/high-contrast-light.js"></script>

<h1>
    Proof of Concept: Custom headings within chart
</h1>

<p>
    This demo shows a basic line chart that includes visually hidden headings before each line.
</p>

<figure class="highcharts-figure">
    <div id="container"></div>
    <p class="highcharts-description">
        Basic line chart showing trends in a dataset. This chart includes the
        <code>series-label</code> module, which adds a label to each line for
        enhanced readability.
    </p>
</figure>

CSS

body {
    font-family: sans-serif;
}

.highcharts-figure {
    margin-top: 40px !important;
}

.highcharts-figure,
.highcharts-data-table table {
    min-width: 360px;
    max-width: 800px;
    margin: 1em auto;
}

.highcharts-data-table table {
    font-family: Verdana, sans-serif;
    border-collapse: collapse;
    border: 1px solid #ebebeb;
    margin: 10px auto;
    text-align: center;
    width: 100%;
    max-width: 500px;
}

.highcharts-data-table caption {
    padding: 1em 0;
    font-size: 1.2em;
    color: #555;
}

.highcharts-data-table th {
    font-weight: 600;
    padding: 0.5em;
}

.highcharts-data-table td,
.highcharts-data-table th,
.highcharts-data-table caption {
    padding: 0.5em;
}

.highcharts-data-table thead tr,
.highcharts-data-table tr:nth-child(even) {
    background: #f8f8f8;
}

.highcharts-data-table tr:hover {
    background: #f1f7ff;
}

JavaScript

// Small wrapper to add an h3 heading before each series element
Highcharts.addEvent(Highcharts.Chart, 'render', function () {
	const chart = this;
    chart.series.forEach(series => {
    	if (!series.headingElement) {
        	series.headingElement = document.createElementNS('http://www.w3.org/2000/svg', 'g');
            series.headingElement.setAttribute('role', 'heading');
            series.headingElement.setAttribute('aria-level', '3');
        }
        series.headingElement.setAttribute('aria-label', series.name);
        const seriesGroupElement = series.group.element;
        seriesGroupElement.insertBefore(
        	series.headingElement, seriesGroupElement.firstChild
        );
        Highcharts.A11yChartUtilities.unhideChartElementFromAT(chart, series.headingElement);
    });
});


// --------------------------------------------------------------

Highcharts.chart('container', {
    title: {
        text: 'U.S Solar Employment Growth by Job Category',
        align: 'left'
    },

    yAxis: {
        title: {
            text: 'Number of Employees'
        }
    },

    xAxis: {
        accessibility: {
            rangeDescription: 'Range: 2010 to 2020'
        }
    },

    legend: {
        layout: 'vertical',
        align: 'right',
        verticalAlign: 'middle'
    },

    plotOptions: {
        series: {
            label: {
                connectorAllowed: false
            },
            pointStart: 2010
        }
    },

    series: [{
        name: 'Installation & Developers',
        data: [43934, 48656, 65165, 81827, 112143, 142383,
            171533, 165174, 155157, 161454, 154610]
    }, {
        name: 'Manufacturing',
        data: [24916, 37941, 29742, 29851, 32490, 30282,
            38121, 36885, 33726, 34243, 31050]
    }, {
        name: 'Sales & Distribution',
        data: [11744, 30000, 16005, 19771, 20185, 24377,
            32147, 30912, 29243, 29213, 25663]
    }, {
        name: 'Other',
        data: [21908, 5548,...