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H14: Create synchronized pie charts #12

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H14: Create synchronized pie charts #12

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3 changes: 2 additions & 1 deletion highcharts-api/highcharts/14-synchronized-pies/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -7,11 +7,12 @@
<meta name="viewport" content="width=device-width, initial-scale=1">

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>

</head>

<body>
<div id="container"></div>
</body>

<script src="main.js"></script>
<script src="main.js"></script>
132 changes: 132 additions & 0 deletions highcharts-api/highcharts/14-synchronized-pies/main.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,132 @@
const data = [
{ name: 'Commerce', y: 52 },
{ name: 'Engineering', y: 20 },
{ name: 'Financial Services', y: 15 },
{ name: 'Logistics, Aviation & Shipping', y: 5 },
{ name: 'Seafood & Marine', y: 7 },
{ name: 'Corporate Services & others', y: 1 }
];

Highcharts.Pointer.prototype.reset = function() {
return undefined;
};

Highcharts.chart('container', {
chart: {
type: 'pie',
events: {
load: function() {
const chart = this;
const { series } = chart;
const legendItems = chart.legend.allItems;

chart.customTooltips = [ chart.tooltip ];
series.slice(1).forEach(s => {
const tooltip = new Highcharts.Tooltip(chart, {
...chart.options.tooltip,
animation: false
});
tooltip.pointer = chart.tooltip.pointer;
chart.customTooltips.push(tooltip);
});

legendItems?.forEach(legendItem => {
const legendGroup = legendItem.legendItem?.group;
if (!legendGroup?.element) return;
const legendItemElement = legendGroup.element;

legendItemElement.addEventListener('mouseover', (e) => {

@annavvis annavvis Jun 30, 2026

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do we need to pass the event here? it's not used anywhere

@dqmrf dqmrf Jun 30, 2026 •
edited
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If it's not used, then it's not needed. My bad

if (!legendItem.visible) return;

const activePoints = series.flatMap(s => {
const point = s.points[legendItem.index];
point.onMouseOver();
return point;
});

activePoints.forEach((p, i) =>
chart.customTooltips[i].refresh(p));
});

legendItemElement.addEventListener('mouseout', () => {
series.forEach(s => {
s.points.forEach(point => {
if (legendItem.index !== point.index) {
point.onMouseOut();
point.setState('normal');
}
});
});

chart.customTooltips.forEach(t => t.hide(0));
});
});
}
}
},
tooltip: {
animation: false
},
plotOptions: {
pie: {
dataLabels: {
enabled: false
},
showInLegend: true,
point: {
events: {
mouseOver: function() {
const point = this;
const { chart } = this.series;
const activePoints = [point];

chart.series.forEach(s => {
if (point.series.index !== s.index) {
s.points[point.index].setState('hover');
activePoints.push(s.points[point.index]);
}
});

activePoints.forEach((p, i) =>
chart.customTooltips[i].refresh(p));
},
mouseOut: function() {
const point = this;
const { chart } = this.series;

chart.customTooltips.forEach(t => t.hide(0));
}
}
}
}
},
series: [
{
data,
center: ['25%', '50%'],
point: {
events: {
legendItemClick: function() {
const { point } = this;
const { chart } = this.series;

chart.series.forEach(s => {
if (point.series.index === s.index) return;
const nextPoint = s.points[point.index];
nextPoint.setVisible(point.visible, false);
if (!point.visible) nextPoint.setState('inactive');
});

chart.customTooltips.forEach(t => t.hide(0));
chart.redraw();
}
}
}
},
{
data,
center: ['75%', '50%'],
showInLegend: false
},
]
});