I wanted to color the chart area of my line graph however it's not working:
options={{
maintainAspectRatio: false,
title: {
display: true,
fontSize: 20
},
chartArea: {
backgroundColor: "blue"
},
I have also recreated this in codesandbox: https://codesandbox.io/s/practical-shadow-9he5y?file=/src/App.js:914-1118
There is no chartArea.backgroundColor option, you will need to use a custom plugin for this:
const plugin = {
id: 'background',
beforeDraw: (chart, args, opts) => {
if (!opts.color) {
return;
}
const {
ctx,
chartArea
} = chart;
ctx.fillStyle = opts.color;
ctx.fillRect(chartArea.left, chartArea.top, chartArea.width, chartArea.height)
}
}
Chart.register(plugin);
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderWidth: 1
}
]
},
options: {
plugins: {
background: {
color: 'cyan'
}
}
}
}
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/3.5.1/chart.js"></script>
</body>I forked a sandbox from yours : React Chartjs Canvas Background
You can register plugins in useEffect :
useEffect(() => {
Chart.register({
id: "custom_canvas_background_color",
beforeDraw: (chart) => {
console.log("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
const ctx = chart.canvas.getContext("2d");
ctx.save();
ctx.globalCompositeOperation = "destination-over";
ctx.fillStyle = "lightGreen";
ctx.fillRect(0, 0, chart.width, chart.height);
ctx.restore();
}
});
}, []);
Also additional useful resources for you :