0👍
The key point is to address the correct properties in the chart configuration when changing the data. These are basically chart.data.datasets[0]backgroundColor, chart.options.scales.x.ticks.color and chart.options.scales.x.ticks.font.weight.
Please take a look at your amended code below and see how it could work.
new Chart("barChart", {
type: 'bar',
data: {
labels: ["jan", "fab", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"],
datasets: [{
label: 'Data',
data: [8, 2, 3, 0, 5, 2, 2, 0, 0, 6, 10, 2],
backgroundColor: 'rgb(197,197,197)',
borderRadius: 6,
borderSkipped: false,
barThickness: 20
}]
},
options: {
onClick: (event, elements, chart) => {
if (elements.length) {
const dataset = chart.data.datasets[0];
dataset.backgroundColor = [];
const ticks = chart.options.scales.x.ticks;
ticks.color = [];
ticks.font.weight = [];
const i = elements[0].index;
for (let i = 0; i < dataset.data.length; i++) {
if (elements[0].index == i) {
dataset.backgroundColor[i] = 'rgb(32,32,32)';
ticks.color[i] = 'rgb(32,32,32)';
ticks.font.weight[i] = 600;
} else {
dataset.backgroundColor[i] = 'rgb(197,197,197)';
ticks.color[i] = 'rgb(153,153,153)';
ticks.font.weight[i] = 400;
}
}
chart.update();
}
},
scales: {
y: {
display: false
},
x: {
grid: {
color: 'white',
drawBorder: false
},
ticks: {
color: 'rgb(153,153,153)',
font: {
family: "'Pretendard', sans-serif",
weight: 400
}
}
}
}
}
});<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.7.1/chart.min.js"></script>
<canvas id="barChart"></canvas>0👍
The above solution guided me to my answer. But for some reason I was not able to update the weight by simply updating the ticks property and updating the chart. I am on chartjs 3.9.1 and the solution that worked for me was to use the scriptable options. I still had to ensure that I called ‘chart.update()’ from the onClick event.
I stored the index in a const variable which I then accessed under the chartOptions to set the weight:
ticks: {
autoSkip: false,
font: {
size: 12,
weight: (w) => {
if (highlighted.includes(w.index)) {
return 700;
} else {
return 100;
}
}
}
}
Hope this helps.