Highcharts: Make the legend symbol a square or rectangle

Question

I am trying to Make the legend symbol a square or rectangle for a line graph. Example

The line is fine. I dont want change the line width. HTML:

<script src="http://code.highcharts.com/highcharts.js"></script>

<div id="container" style="height: 400px"></div>

Javascript:

$(function () {
    var chart = new Highcharts.Chart({
        chart: {
        renderTo: 'container',
        type: 'line',
        },
        xAxis: {
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
        },

        plotOptions: {
            series: {
                marker: {
                    enabled: false
                }
            }
        },
        legend: {
            layout: 'vertical',
            align: 'right',
            verticalAlign: 'middle',
            symbolHeight:100,
            borderWidth: 0
        },

        series: [{
            data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
        }]
    });
});

I tried adding symbolHeight in legend. But its not working.

legend: {
            layout: 'vertical',
            align: 'right',
            verticalAlign: 'middle',
            symbolHeight:100,
            borderWidth: 0
        },

How to increase the height of line symbol to make it rectangle or square?

Answer 1

It's possible to achieve square legend symbols via configuration. Just set legend.symbolRadius value to 0.

JSFiddle demo: https://jsfiddle.net/9bzy2qzq/

Answer 2

This is a copy of the question: How to access legendSymbols and change their shape in HighCharts

It has a similar answer and two others:

First Option:

Highcharts.seriesTypes.line.prototype.drawLegendSymbol = 
Highcharts.seriesTypes.area.prototype.drawLegendSymbol;

Second Option:

You can change the stroke-width attribute on the path element.

We can provide functions to Highcharts that will be drawn whenever the chart is drawn. Since redraw is not called on the first drawing the load event is needed

chart: {
    events: {
        load: function () { 
            $(".highcharts-legend-item path").attr('stroke-width', 10);
        },
        redraw: function () {
            $(".highcharts-legend-item path").attr('stroke-width', 10);
        }
    }
},

Answer 3

You can make a fake series as follows and provider marker to it.

$(function () {
var chart = new Highcharts.Chart({
    chart: {
    renderTo: 'container',
    type: 'line',
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },

    plotOptions: {
        series: {
            marker: {
                enabled: true
            }
        }
    },
    legend: {
        layout: 'vertical',
        align: 'right',
        verticalAlign: 'middle',

        //borderWidth: 0
    },

    series: [{

        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
        showInLegend : false,


        marker:{enabled:false}

    },{
        name : "testing",
        data : {},
        marker : {symbol : 'square',radius : 12 }
    }
            ]
});
});

Working demo : DEMO