How can I datalabels and Sum display in the same time on a stacked bar - chart.js

Question

I try to have in the same time datalabels and the sum display in my stacked bar chart.
I use chartjs-plugin-datalabels.js to display datalabels or sum.
Above just with datalabels:
Above just with sum :
I would like to have both in the same chart.
I use the follow tricks to sum display :
<script>
const totalizer = {
id: 'totalizer',
beforeUpdate: chart => {
let totals = {}
let utmost = 0
chart.data.datasets.forEach((dataset, datasetIndex) => {
if (chart.isDatasetVisible(datasetIndex)) {
utmost = datasetIndex
dataset.data.forEach((value, index) => {
totals[index] = (totals[index] || 0) + value
})
}
})
chart.$totalizer = {
totals: totals,
utmost: utmost
}
}
}
new Chart('chart', {
type: 'bar',
data: {
labels: ["Note par thème du répondant", "Note par thème sectorielle", "Note par thème générale"],
datasets: [{
label: 'Thème 1',
data: [12, 19, 3],
backgroundColor: 'rgba(255, 206, 86)'
},
{
label: 'Thème 2',
data: [3,8,1],
backgroundColor: 'rgba(54, 162, 235)'
},
{
label: 'Thème 3',
data: [ 5, 2, 3],
backgroundColor: 'rgba(255, 255, 132)'
},{
label: 'Thème 4',
data: [ 5, 2, 3],
backgroundColor: 'rgba(255, 99, 255)'
},{
label: 'Thème 5',
data: [ 5, 2, 3],
backgroundColor: 'rgba(100, 250, 132)'
},{
label: 'Thème 6',
data: [ 5, 2, 3],
backgroundColor: 'rgba(89, 99, 132)'
},{
label: 'Thème 7',
data: [ 5, 2, 3],
backgroundColor: 'rgba(255, 0, 132)'
},{
label: 'Thème 8',
data: [ 5, 2, 3],
backgroundColor: 'rgba(0, 150, 255)'
},{
label: 'Thème 9',
data: [ 5, 2, 3],
backgroundColor: 'rgba(100, 100, 100)'
},{
label: 'Thème 10',
data: [ 10, 4, 7],
backgroundColor: 'rgba(255, 255, 0)'
}]
},
options: {
title :{
display :true,
text : "Mon titre"
},
scales: {
yAxes: [{
stacked: true,
ticks: {
beginAtZero: true,
suggestedMax: 100
}
}],
xAxes: [{
stacked: true
}]
},
plugins: {
datalabels: {
formatter: (value, ctx) => {
const total = ctx.chart.$totalizer.totals[ctx.dataIndex]
return total.toLocaleString('fr-FR', {})
},
align: 'end',
anchor: 'end',
display: function(ctx) {
return ctx.datasetIndex === ctx.chart.$totalizer.utmost
}
}
}
},
plugins: [totalizer]
});
</script>
I would appreciate any help. Thanks!

Answer 1

OK, I found a way to show Sum and datalabels in the same time.
I add new dataset to represent "Total data" with a backgroundColor transparent and I add this following code in my dataset Total:
datalabels: {
backgroundColor: function (context) {
return 'rgba(244,50,49)';
},
formatter: (value, ctx) => {
const total = ctx.chart.$totalizer.totals[ctx.dataIndex];
return total.toLocaleString('fr-FR', {})
},
align: 'end',
anchor: 'end',
display: function (ctx) {
return ctx.datasetIndex === ctx.chart.$totalizer.utmost
}
Full code bellow :
<script>
const totalizer = {
id: 'totalizer',
beforeUpdate: chart => {
let totals = {}
let utmost = 0
chart.data.datasets.forEach((dataset, datasetIndex) => {
if (chart.isDatasetVisible(datasetIndex)) {
utmost = datasetIndex
dataset.data.forEach((value, index) => {
totals[index] = (totals[index] || 0) + value
})
}
})
chart.$totalizer = {
totals: totals,
utmost: utmost
}
}
}
new Chart('chart', {
type: 'bar',
data: {
labels: ["Note par thème du répondant", "Note par thème sectorielle", "Note par thème générale"],
datasets: [{
label: 'Thème 1',
data: [10, 10, 10],
backgroundColor: 'rgba(68,114,196,0.6)'
}, {
label: 'Thème 2',
data: [13, 8, 11],
backgroundColor: 'rgba(237,125,49,0.6)'
}, {
label: 'Thème 3',
data: [5, 12, 13],
backgroundColor: 'rgba(165,165,165,0.6)'
}, {
label: 'Thème 4',
data: [9, 12, 13],
backgroundColor: 'rgba(255,192,0,0.6)'
}, {
label: 'Thème 5',
data: [5, 12, 9],
backgroundColor: 'rgba(91,155,213,0.6)'
}, {
label: 'Thème 6',
data: [9, 12, 5],
backgroundColor: 'rgba(112,173,71,0.6)'
}, {
label: 'Thème 7',
data: [5, 12, 10],
backgroundColor: 'rgba(38,68,120,0.6)'
}, {
label: 'Thème 8',
data: [15, 12, 10],
backgroundColor: 'rgba(99,99,99,0.6)'
}, {
label: 'Thème 9',
data: [15, 12, 11],
backgroundColor: 'rgba(37,94,145,0.6)'
}, {
label: 'Thème 10',
data: [10, 4, 7],
backgroundColor: 'rgba(24,91,62,0.6)'
}, {
label: 'Total',
data: [0, 0, 0],
backgroundColor: 'rgba(24,91,62,0)',
datalabels: {
backgroundColor: function (context) {
return 'rgba(244,50,49)';
},
formatter: (value, ctx) => {
const total = ctx.chart.$totalizer.totals[ctx.dataIndex];
return total.toLocaleString('fr-FR', {})
},
align: 'end',
anchor: 'end',
display: function (ctx) {
return ctx.datasetIndex === ctx.chart.$totalizer.utmost
}
}
}
]
},
options: {
title: {
text: "Mon titre",
display: true
},
scales: {
yAxes: [{
stacked: true,
ticks: {
beginAtZero: true,
suggestedMax: 100
}
}
],
xAxes: [{
stacked: true
}
]
},
plugins: {
datalabels: {
color: 'rgba(255,255,255)',
display: function (context) {
return context.chart.isDatasetVisible(context.datasetIndex);
},
backgroundColor: function (context) {
return context.dataset.backgroundColor;
},
borderRadius: 4,
font: {
weight: 'bold'
}
}
}
},
plugins: [totalizer]
});
</script>

Answer 2

Great! I just simplified solution without totilizer:
datasets: {
label: 'Total',
data: [120, 120, 120, 120, 120, 120, 120, 120, 120, 120],
backgroundColor: 'rgba(24,91,62,0)',
datalabels: {
backgroundColor: () => 'white',
formatter: (value, ctx) => {
let total = 0;
let index = ctx.dataIndex;
data.datasets.map((d, i) => {
if (i === 2) return;
total += d.data[index];
});
return total;
},
align: 'end',
anchor: 'end',
padding: 0,
},
},