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✅
You get access to the chart object and have the data index so you can just get the correct label from the labels array like so:
title: (items) => {
const item = items[0];
const {
chart
} = item;
const nextLabel = chart.data.labels[item.dataIndex + 1] || '';
return `${item.label}, next label: ${nextLabel}`;
}
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'orange'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'pink'
}
]
},
options: {
plugins: {
tooltip: {
callbacks: {
title: (items) => {
const item = items[0];
const {
chart
} = item;
const nextLabel = chart.data.labels[item.dataIndex + 1] || '';
return `${item.label}, next label: ${nextLabel}`;
}
}
}
}
}
}
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/3.7.1/chart.js"></script>
</body>
Source:stackexchange.com