2👍
✅
options.plugins.legend.labels.generateLabels
can still be used in Chart.js v3. For your case, this could look as follows:
generateLabels: chart => chart.data.labels.slice(0, 2).map((l, i) => ({
datasetIndex: i,
text: l,
fillStyle: chart.data.datasets[i].backgroundColor,
strokeStyle: chart.data.datasets[i].backgroundColor,
hidden: chart.getDatasetMeta(i).hidden
}))
const trend_options = {
responsive: true,
maintainAspectRatio: false,
plugins: {
datalabels: {
formatter: function(value, ctx) {
const otherDatasetIndex = ctx.datasetIndex % 2 === 0 ? ctx.datasetIndex + 1 : ctx.datasetIndex - 1;
const total = ctx.chart.data.datasets[otherDatasetIndex].data[ctx.dataIndex] + value;
return `${(value / total * 100).toFixed()}%`;
},
font: {
weight: "bold"
},
color: "#fff",
display: function(context) {
let index = context.dataIndex;
let value = context.dataset.data[index];
return value > 0; // display labels with a value greater than 0
}
},
legend: {
labels: {
generateLabels: chart => chart.data.labels.slice(0, 2).map((l, i) => ({
datasetIndex: i,
text: l,
fillStyle: chart.data.datasets[i].backgroundColor,
strokeStyle: chart.data.datasets[i].backgroundColor,
hidden: chart.getDatasetMeta(i).hidden
}))
}
},
},
scales: {
x: {
stacked: true
},
y: {
stacked: true,
suggestedMax: 15,
ticks: {
beginAtZero: true,
stepSize: 5,
}
}
},
};
const app_data_trend = [{
label: 'data 1',
data: [3, 4, 5, 6, 4, 4, 4],
backgroundColor: '#007bff',
stack: 'Stack 0',
},
{
label: 'data 2',
data: [3, 4, 5, 4, 3, 2, 3],
backgroundColor: '#6DB526',
stack: 'Stack 0',
},
{
label: 'data 1',
data: [4, 4, 4, 3, 2, 5, 4],
backgroundColor: '#007bff',
stack: 'Stack 1',
},
{
label: 'data 2',
data: [4, 2, 5, 2, 3, 3, 4],
backgroundColor: '#6DB526',
stack: 'Stack 1',
},
{
label: 'data 1',
data: [2, 4, 5, 2, 4, 5, 3],
backgroundColor: '#007bff',
stack: 'Stack 2',
},
{
label: 'data 2',
data: [1, 1, 2, 4, 4, 3, 5],
backgroundColor: '#6DB526',
stack: 'Stack 2',
},
]
const ctx8 = document.getElementById("tsa-applications-trending");
const chart8 = new Chart(ctx8, {
plugins: [ChartDataLabels],
type: 'bar',
data: {
labels: ['person1', 'person2', 'person3', 'person4'],
datasets: app_data_trend
},
options: trend_options,
});
.chart-container {
position: relative;
height: 80vh;
width: 80vw
}
<script src="https://cdn.jsdelivr.net/npm/chart.js@3.7.1/dist/chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@2.0.0"></script>
<div class="chart-container">
<canvas id="tsa-applications-trending"></canvas>
</div>
The problem with the approach is, that the displayed legend
elements are still tied to individual datasets only. If you want to show/hide other datasets as well, you also need to define a legend.onClick
function, similar to the one from this answer.
Source:stackexchange.com