Transparent plot area of heatmap using highcharts - heatmap

Question

how to make a heatmap's plot area as transparent.
i would like to remove all the white blocks in the chart and make it transparent, so that background colors are visible.
refer this fiddle
$(function () {
$('#container').highcharts({
chart: {
type: 'heatmap',
marginTop: 40,
marginBottom: 40,
backgroundColor: {
linearGradient: { x1: 1, y1: 0, x2: 0, y2: 1 },
stops: [
[0.23, 'rgb(240, 59, 9)'],
[0.5, 'rgb(255, 224, 80)'],
[0.67, 'rgb(54, 64, 207)'],
[0.99, 'rgb(13, 163, 35)'],
[1, 'rgb(217, 186, 50']
]
},
},
title: {
text: 'Sales per employee per weekday'
},
xAxis: {
categories: ['Alexander', 'Marie', 'Maximilian', 'Sophia', 'Lukas', 'Maria', 'Leon', 'Anna', 'Tim', 'Laura']
},
yAxis: {
categories: ['< 1%', '2-10%', '11-50%', '51-90%', '91-100%'],
title: null
},
colorAxis: {
min: 0,
minColor: '#FFFFFF',
maxColor:'#FFFFFF'
//maxColor: Highcharts.getOptions().colors[0]
},
legend: {
align: 'right',
layout: 'vertical',
margin: 0,
verticalAlign: 'top',
y: 25,
symbolHeight: 320
},
tooltip: {
formatter: function () {
return '<b>' + this.series.xAxis.categories[this.point.x] + '</b> sold <br><b>' +
this.point.value + '</b> items on <br><b>' + this.series.yAxis.categories[this.point.y] + '</b>';
}
},
series: [{
name: 'Sales per employee',
borderWidth: 1,
data: [[0,0,0],[0,1,19],[0,2,8],[0,3,24],[0,4,67],[1,0,92],[1,1,58],[1,2,78],[1,3,117],[1,4,48],[2,0,35],[2,1,15],[2,2,123],[2,3,64],[2,4,52],[3,0,72],[3,1,132],[3,2,114],[3,3,19],[3,4,16],[4,0,38],[4,1,5],[4,2,8],[4,3,117],[4,4,115],[5,0,88],[5,1,32],[5,2,12],[5,3,6],[5,4,120],[6,0,13],[6,1,44],[6,2,88],[6,3,98],[6,4,96],[7,0,31],[7,1,1],[7,2,82],[7,3,32],[7,4,30],[8,0,85],[8,1,97],[8,2,123],[8,3,64],[8,4,84],[9,0,47],[9,1,114],[9,2,31],[9,3,48],[9,4,91]],
dataLabels: {
enabled: true,
color: 'black',
style: {
textShadow: 'none'
}
}
}]
});
});

Answer 1

Here is the fiddle solution
$(function () {
$('#container').highcharts({
chart: {
type: 'heatmap',
marginTop: 40,
marginBottom: 40,
plotBackgroundColor: {
linearGradient: { x1: 1, y1: 0, x2: 0, y2: 1 },
stops: [
[0.03, 'rgb(247, 88, 45)'],
[0.5, 'rgb(255, 224, 80)'],
[0.67, 'rgb(54, 64, 207)'],
[0.99, 'rgb(13, 163, 35)'],
[1, 'rgb(217, 186, 50']
]
}
},
title: {
text: 'Sales per employee per weekday'
},
xAxis: {
categories: ['Insignificant', 'Minimum', 'Significant', 'Material', 'Critical']
},
yAxis: {
categories: ['< 1%', '2-10%', '11-50%', '51-90%', '91-100%'],
title: null
},
colorAxis: {
min: 0,
minColor: 'transparent',
maxColor:'transparent'
//maxColor: Highcharts.getOptions().colors[0]
},
legend: {
align: 'right',
layout: 'vertical',
margin: 0,
verticalAlign: 'top',
y: 25,
symbolHeight: 320
},
tooltip: {
formatter: function () {
return '<b>' + this.series.xAxis.categories[this.point.x] + '</b> sold <br><b>' +
this.point.value + '</b> items on <br><b>' + this.series.yAxis.categories[this.point.y] + '</b>';
}
},
series: [{
name: 'Sales per employee',
borderWidth: 1,
data: [[0,0,0],[0,1],[0,2,8],[0,3,24],[0,4,67],[1,0,92],[1,1,58],[1,2,78],[1,3,117],[1,4,48],[2,0,35],[2,1,15],[2,2,123],[2,3,64],[2,4,52],[3,0,72],[3,1,132],[3,2,114],[3,3,19],[3,4,16],[4,0,38],[4,1,5],[4,2,8],[4,3,117],[4,4,115]],
dataLabels: {
enabled: true,
color: 'black',
style: {
textShadow: 'none'
}
}
}]
});
});