Answer to Stack Overflow question: https://stackoverflow.com/questions/51529303/break-highcharts-legend-items-into-two-lines

author(s): Mike Zavarello

by Mike Zavarello

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>

<div align="center">
  <form id="test" name="test" method="post">
    <input type="checkbox" class="myCheckboxClass" name="myCheckbox" series="Tokyo" id="checkbox1" checked><label for="checkbox1">Tokyo</label>
    <input type="checkbox" class="myCheckboxClass" name="myCheckbox" series="New York" id="checkbox2" checked><label for="checkbox1">New York</label>
    <br />
    <input type="checkbox" class="myCheckboxClass" name="myCheckbox" series="Berlin" id="checkbox3" checked><label for="checkbox1">Berlin</label>
    <input type="checkbox" class="myCheckboxClass" name="myCheckbox" series="London" id="checkbox4" checked><label for="checkbox1">London</label>
  </form>
</div>

JavaScript

Highcharts.chart('container', {
    title: {
        text: 'Monthly Average Temperature'
    },
    subtitle: {
        text: 'Source: WorldClimate.com'
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
            'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    yAxis: {
        title: {
            text: 'Temperature (°C)'
        },
        plotLines: [{
            value: 0,
            width: 1,
            color: '#808080'
        }]
    },
    tooltip: {
        valueSuffix: '°C'
    },
    legend: {
        enabled: false
    },
    series: [{
        name: 'Tokyo',
        data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6]
    }, {
        name: 'New York',
        data: [-0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5]
    }, {
        name: 'Berlin',
        data: [-0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0]
    }, {
        name: 'London',
        data: [3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
    }]
});

	// when a checkbox is clicked, trigger the function
	$(".myCheckboxClass").on('click',function() {
			// get the value of "series", a custom attribute for the checkbox
			var seriesName = $(this).attr("series");
			// if that value matches a series, show or hide it in the chart
			for (i = 0; i < $("#container").highcharts().series.length; i++) {
				if ($("#container").highcharts().series[i].name == seriesName) {
					// if the checkbox is checked, show the dataset
					if ($(this).prop("checked")) {
						$("#container").highcharts().series[i].show();
					// if the checkbox is unchecked, hide the dataset
					} else {
						$("#container").highcharts().series[i].hide();
					}
				}
			}
	});