How to use two y axes in chart.js?
How to use two y axes in chart.js?
1 answer
by
daisha ,
4 months ago
@darrion.kuhn
To use two y-axes in Chart.js, you can use the yAxes property within the scales option. Here's an example:
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var ctx = document.getElementById("myChart").getContext("2d");
var myChart = new Chart(ctx, {
type: "line",
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [
{
label: "Dataset 1",
data: [12, 19, 3, 5, 2, 3],
yAxisID: 'y-axis-1',
backgroundColor: "rgba(255, 99, 132, 0.2)",
borderColor: "rgba(255, 99, 132, 1)",
borderWidth: 1
},
{
label: "Dataset 2",
data: [200, 150, 300, 250, 100, 150],
yAxisID: 'y-axis-2',
backgroundColor: "rgba(54, 162, 235, 0.2)",
borderColor: "rgba(54, 162, 235, 1)",
borderWidth: 1
}
]
},
options: {
scales: {
yAxes: [
{
id: 'y-axis-1',
position: 'left',
ticks: {
beginAtZero: true
}
},
{
id: 'y-axis-2',
position: 'right',
ticks: {
beginAtZero: true
}
}
]
}
}
});
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In the above code, we create a line chart with two datasets (Dataset 1 and Dataset 2). Each dataset is associated with a specific y-axis using the yAxisID property.
The scales option is used to specify the configuration of the axes. In the yAxes property, we define two axes - y-axis-1 and y-axis-2 - and set their position (left and right, respectively) and ticks configuration.
This configuration allows you to display two different scales on the y-axes for your datasets.