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You can make use of the scriptable options to give the point a different background color if there are multiple points in that spot
Example:
const overlappingPointsCheck = (x, y) => {
if (!x.parsed) return;
let overlappingPoints = false;
for (let i = x.datasetIndex + 1; i < x.chart.data.datasets.length; i++) {
if (x.parsed.y === x.chart.data.datasets[i].data[x.parsed.x]) {
overlappingPoints = true;
break;
}
}
return overlappingPoints;
}
const multipleEntrieColor = 'purple';
const options = {
type: 'scatter',
data: {
labels: [0, 1, 2, 3],
datasets: [{
label: '# of Votes',
data: [12, 11, 3, 5],
borderWidth: 1,
backgroundColor: (x, y) => {
return overlappingPointsCheck(x, y) ? multipleEntrieColor : 'red';
}
},
{
label: '# of Points',
data: [7, 11, 5, 8],
borderWidth: 1,
backgroundColor: (x, y) => {
return overlappingPointsCheck(x, y) ? multipleEntrieColor : 'blue';
}
},
{
label: '# of Points',
data: [2, 9, 7, 8],
borderWidth: 1,
backgroundColor: (x, y) => {
return overlappingPointsCheck(x, y) ? multipleEntrieColor : 'green';
}
}
]
},
options: {}
}
const ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.2.0/chart.js"></script>
</body>
Source:stackexchange.com